bluuebunny/crossref_metadata_2025 huggingface dataset:
The Dynamic Response of the Platform Mooring Conditions
Authors: Wu Xin Xin , Liu Yue Qin , Xu Jin Hao , Chen Chao He
Published: January 2014

Using the finite element ANSYS workbench platform Hydrodynamic Diffraction and Hydrodynamic Time Response Module, taking a self-elevating offshore mooring location as a study case for the corresponding value calculated the dynamic response of the platform. Studied in the wind, waves and currents under load, platforms and mooring ropes coupled motion in case of time-domain response analysis, and get mooring ropes mooring and platform displacement force-time curve. Methods discussed in this paper have a certain reference value for offshore platform mooring positioning.
The Application and Improvement of MESIS in Chongqing
Authors: Min Fan Hua , Xia Bai Cheng , Li Jing , Liu Ting Ting
Published: January 2014

MESIS, a new generation system, based on advanced information technologies, such as geographic information, database, visualizing, workflow, multimedia and web, work for real-time analysis and mass-industrialization of metrology service products. The system has been installed and localized in Chongqing and the three class data is collected and got. The individualization maps are made with meteorology stations, rivers and administrative area and the models of meteorological service products are made. The meteorological service products can be produced automatically with MSPGS and the meteorological service products for a certain range can be got.
Nitrate Removal of Fluidized-Bed Biofilm Reactors Using Starch / Polyvinyl Alcohol Blends as Carbon Source and Carrier Simultaneously at Low Temperature
Authors: Zhou Hai Hong , He Fang
Published: January 2014

A kind of controlled-release carbon source, starch / polyvinyl alcohol blends (SPVA), was used as both carbon source and biofilm supporter in laboratory-scale fluidized-bed biofilm reactors (FBBRs) to remove nitrate from groundwater. Results show: when the influent nitrate concentration was 100 mg-N /L, FBBRs packed with SPVA can effectively remove nitrate from groundwater at the condition of temperature 20 °C, hydraulic resident time (HRT) 4 h. The effluent nitrate can meet with the Chinese drinking water standards at low temperature (15-2 °C) by adjusted the HRT of FBBRs. The denitrification rate declined nonlinearly with the decrease of temperature and changed sharply in the range of 20-15 °Cand 10-5 °C.
Heat Effect Analysis of Buried Oil Pipeline in the Qinghai-Tibet Plateau
Authors: Liu Wei Bo , Yu Wen Bing , Yi Xin , Chen Lin
Published: January 2014

The Geermu-Lasa oil pipeline was located in the Qinghai-Tibet Plateau permafrost regions. The building and operating of pipeline will change the temperature field of soil around it, which can lead to changes of frozen soil mechanic properties, and this will induces deformation or even fracture of pipeline. These phenomena will affect the normal transportation of oil. In this paper, temperature field around the pipelines were analyzed due to different pipe diameters and different insulation layer thicknesses in the way of finite element method. The rule of thawing and freezing of soil around the pipeline in an annual cycle was obtained. Artificial permafrost table variations under the pipeline were also obtained due to different operating conditions. For 30cm diameter pipeline with 7cm insulation layer, its artificial permafrost table depth change value is just 0.48m after 30-year running. These analysis results can provide references to the construction of the new Geermu-Lasa oil pipeline.
Numerical Simulation Study on the Wave Dissipating Performance of Air Bubbles Breakwater with Double Air Discharged Pipes
Authors: Zhang Cheng Xing
Published: January 2014

The numerical simulation of air bubbles breakwater was presented in this paper. The two-phase fluid of water and air was assumed as a variable density fluid. The numerical models were developed by FLUENT in order to explore the air amount scale in the system of air bubbles breakwater . The impact of double air discharged pipes on the wave dissipating performance of air bubble breakwater was obtained, which illuminated that under the condition of equal total air amount of Qp, the wave dissipating performance of air bubbles breakwater with double air discharged pipes breakwater may not be improved in comparison with the air bubbles breakwater with single air discharged pipe.
Explore the Influence of Bottom Friction Parameter and Wave Breaking Parameter on Wave Height and Wave Period by MIKE21 SW Module
Authors: Gui Jin Song , Feng Ming Wei , Zhang Rui Jin
Published: January 2014

By using MIKE21SW module to simulate the waves, the paper explores the influence of bottom friction parameter and wave breaking parameter on wave height and wave period. The law for future MIKE21 parameter calibration is summarized.
Research on Soft Soil Model and Subsidence Coefficient of Coastal Zone of Yingkou
Authors: Zhang Hui , Zhang Jing
Published: January 2014

In the foundation of massive area examination and the indoor laboratory static mechanics triaxial tests, choosed the appropriate soil body elastoplasticity modeling according to the serviceability and the usability, and established the macroscopic numerical model of the soft soil of Yingkou coastal zone, summarized the influence of different burying depth, the level thick to the location project nature, seeked the rule of region soft soil subsidence. It was validated the established earth statics model by the axial symmetry question's radial direction draining concretion test and undraining concretion test and choosed reasonable subsidence computational method compare with conventional av1-2, e-lgp and so on standard method and definited the subsidence empirical coefficient Ψs of this area for estimate subsidence. Based on contrast of three kind of model computation and the triaxial test, we have obtained the region soft soil practical modellings, the Yingkou coastal zone usesd nonlinear elastic (Duncan and Chang )model to be more appropriately.
Research on Flood Integrated Risk Dynamic Management Framework for Coastal Cities
Authors: Liu Ming Qiong , Gao Hui Ying , Zhao Chun Yan
Published: January 2014

From the point of flood integrated risk analysis and risk dynamic management, analysis and discussion the reason of flood disasters occur frequently. Flood risk management is divided into six types: flood risk, flood control project risk, flood investment risk, flood plain risk, flood eco-environment risk and flood control decision risk management. Furthermore, a risk assessment model was established, and this paper puts forward four targets of flood risk management, eventually forming flood risk management flow, which provides a framework for flood integrated risk analysis and risk management.
Study on the Applications of Neural Networks for Processing Deformation Monitoring Data
Authors: Gao Cai Yun , Cui Xi Min , Hong Xue Qian
Published: January 2014

Accurately estimating the deformation of high-rise building is a very important work for surveyors, however it is very difficult to get an accurate and reliable predictor. In this paper, artificial neural network has been applied here because of its good ability of nonlinear fitting. On the basis of the high-rise building monitoring data, three prediction models including the BP, RBF and GRNN neural network prediction models were established, the comparative analysis for the prediction accuracy of the three models was obtained. The results show that neural network is capable for prediction, and GRNN possess higher capability in prediction and better adaptability in comparing with other two neural networks.
Analysis of Creating Correction Algorithms for GPS Network RTK System
Authors: Wang Shi Tai , Yin Min
Published: January 2014

In order to analyze the effect of using different creating correction algorithms and geometry of reference stations on the correction accuracy of a user station, interpolation coefficients (correction quality factors) were calculated based on six algorithms, three experiment networks and two users in different positions. These algorithms include Partial Derivative Algorithm (PDA), Distance-based Linear Interpolation Method (DLIM), Linear Interpolation Method (LIM), Low-order Surface Model (LSM), Linear Combination Model (LCM) and Least - Squares Collocation (LSC). By comparative analysis on these factors a conclusion can be drawn as follow, LIM and LCM algorithms are better than others in creating correction; the geometry of reference stations involved in calculation needs to be carefully considered.
Numerical Optimization Analysis of the Construction Sequence of PBA Group Hole
Authors: Hu Heng Qian
Published: January 2014

Based on the PBA construction method of Changchun Liberation Road station metro line No.2, in order to get the optimization of construction sequence of six pilot tunnels, we use numerical simulation method and finite element software MIDAS GTS to establish the construction model of the station pilot tunnel. After comparing four excavation methods of the surface subsidence, we come to a conclusion that first up then down and first side then middle is the optimal excavation scheme. At the same time, we make models to analysis the necessity of making advance support before pilot tunnel construction. Pipe shed and small duct grouting pre support is very significant to the control of the subsidence of ground surface and vault.
Nonlinear Analysis and Construction Method of a Silo Dome with Grain
Authors: Wan Jian
Published: January 2014

Combined with the project which a grain silo need be transformed, a new type of silo is put forward. The silo system consists of supporting columns, the silo body and latticed shell roof structure. In view of the force is different between silo shell roof and conventional roof, and silo shell roof prones to buckling failure. The linear and nonlinear buckling analysis was carried out for latticed shell with a diameter of 20m, the results show that the buckling loads obtained by linear buckling analysis is greater than that obtained by nonlinear buckling analysis, and nonlinear analysis is more secure for structures. Through the comparison the rationality and stability of reticulated shell design are verified, finally construction measures of this system are given, and these can provide references for design and construction of similar engineering.
Numerical Analysis of the CFG Composite Foundation's Mechanical Properties Influenced by Lateral Soil Movement due to Heaped Loads
Authors: Qiao Jing Sheng , Zhao Xiao Bo
Published: January 2014

The subject uses finite element analysis method to study on mechanical properties of the composite foundation under lateral soil movement due to heaped loads. There are mainly includes the following aspects of work content in this research thesis: Through the use of finite element analysis software to establish a three-dimensional finite element analysis model, research and analysis of the various factors, such as the size and the operating range of the heap load, the self-weight of the building, the compression modulus of the soil, the elastic modulus of the CFG piles, which under the lateral soil movement due to heaped loads, effect on mechanical properties of the CFG piles composite foundation. Researching the working characteristics of the CFG piles composite foundation, this is affected by the heap loads. And main conclusions are drawn as follows: the size and the operating range of the heap load, the compression modulus of the shallow soil layer are the main factors to affect the mechanical properties of the composite foundation that under lateral soil movement due to heaped loads. When the heaped load exists, the stress and deformation of the composite foundation occur mainly in the range of 0.4L ~ 0.6L (L is the length of the pile) below ground. At the same time, Analyzed and summarized the formulas for calculating stress and deformation of the CFG piles in the composite foundation that under the soil lateral displacement. Key words: heap loads; soil lateral displacement composite foundation; numerical analysis
Research on Lifetime of Catalytic Combustion Monolith inside Natural Gas Burner
Authors: Zhang Shi Hong , Zhang Jie
Published: January 2014

This article discussed the factors that affect the lifetime of catalyst. For the lifetime of catalyst about catalytic combustion burner III 1100 hours were obtained. The local surface temperatures of monolith, the gas temperature inside channels and pollutant concentrations were measured. The ageing of catalyst to the change of local surface temperatures and gas temperature was approached and its affecting factors were analysed. This will improve the working conditions of catalytic combustion burner in future, and prolong its lifetime of catalyst.
The Numerical Simulation of Thermal Environment of Strawberry Greenhouse in Natural Ventilation
Authors: Fu Wei Hong , You Shi Jun
Published: January 2014

The method of numerical simulation was adopted in this study to explore the size of the natural ventilation inlet opening, outdoor temperature and ambient wind speed and other environmental parameters to effect of the varied rules of thermal environment of the strawberry solar greenhouse. The variation of outdoor air temperature effected greatly to the indoor thermal environment, the average air velocity in the strawberry growing zoon within the greenhouse was rose initially and dropped tend to the steady with increasing outdoor air temperature. The average temperature in the strawberry growing zoon was decreased with increasing the outside wind speed. The average air velocity was increased gradually in the strawberry growing zoon within the greenhouse with increasing outdoor wind speed. The average velocity was reduced gradually toward to constant.
Boundary Layer Wind Characteristics over Urban Area
Authors: Zhi Lun Hai
Published: January 2014

This paper presents statistical analysis results of wind speed and atmospheric turbulence data measured from a meteorological station in Beijing and is primarily intended to provide useful information on boundary layer wind characteristics for wind-resistant design of tall buildings and high-rise structures. Wind velocity data in longitudinal, lateral and vertical directions, which were recorded from an ultrasonic anemometer during windstorms, are analyzed and discussed. Atmospheric turbulence information such as turbulence intensity, gust factor, turbulence integral length scale and power spectral densities of the three-dimensional fluctuating wind velocity are presented and used to evaluate the adequacy of existing theoretical and empirical models. The objective of this study is to investigate the profiles of mean wind speed and atmospheric turbulence characteristics over a typical urban area.
Stimulation Study over the Capacity of Air Distribution to Eliminate the Contaminant in Isolation Wards
Authors: Ji Yun Zhe , Wang Xiao Jie
Published: January 2014

The isolation wards should use the reasonable air distribution to control the distribution and elimination speed of the contaminant. This paper will simulate the distribution of the carrier particles in the wards under the condition of different ventilation rates and air distribution and the change rules of the remaining particles with the time by building a ward model with unsteady stated contaminant source. The simulation results show that all the factors like the arrangement of the air inlets, the ventilation rates, the amounts of the air outlets could affect the capacity of the air distribution to eliminate contaminants, among which the effect of the ventilation rates is the most remarkable. The conclusion also proves that using the CFD technology to simulate could have great guiding significance on determining the various form factors of the air distributions in the wards.
Analysis of Selecting Cooling Load Coefficient Methods
Authors: Chen Jian , Xie Wen Wen
Published: January 2014

This paper analyses the method of how to select the coefficient of cooling load caused by indoor heat source (including equipment, lighting and personnel) and solar heat gain, which provides a basis for the correct calculation of air condition cooling load.
Analysis of Screw Chiller's Refrigeration Performance under Large Temperature Difference Cooling-Water
Authors: Chen Gang , Cheng Xin
Published: January 2014

This paper using river water as cooling-water to theoretical calculation the refrigerating unit performance of screw chiller. To calculate the change of cooling water flow affected the coefficient of performance under a certain inlet temperature, and compare with other state of affairs. Through the analysis, it could found out that when the cooling-water temperature range between 24~28°C while the outlet temperature is 37°C, it can enhance the refrigerating unit coefficient of performance by reduce the cooling-water flow within limits.
Study on Enhanced Heat Transfer and Structural Optimum for Combination Vortex Generator in Spiral Channel
Authors: Qing De Fan , Zhang Ya Long , Liu Sheng Xue , Wang Cui Fang
Published: January 2014

The array configuration of delta wing and elliptical cylinder vortex generator in the spiral surface channel was studied. By changing the assembly distance s, the triangle wing vortex generator angle of attack α, the elliptical cylinder vortex generator angle of attack β to research the heat transfer and resistance properties under different working conditions. The research model as follow: the heat-medium is water-vapor [H2, the cold medium of flow is air, Steam temperature is 400K and air inlet temperature is 293K, the Reynolds number ranging from 4000 to 7000.The optimum structure was determined by using numerical simulation method and orthogonal experiment method. The result shows the optimization structure of the combination vortex generator: α=45°, β=45°, s=90mm. Compared with the normal structure, the heat transfer enhancement comprehensive effect of the optimization structure raised about 36.2%~47.6%.
Optimal Parameters for Multi-Pump Control System with Blind Source Separation Based on Independent Component Analysis
Authors: Li Shu Fang
Published: January 2014

Finding the optimal parameters for multi-pump control system of water supply is regarded as a difficult problem with blind source separation (BSS). A motor acceleration or deceleration curve of water supply can be assumed as a weighted sum by feature control parameters, such as pipe line pressure, water flux, and sleeping interval, etc. With the help of destruction of separation model, a group of optimal parameters are found. The solution is to the optimal control parameters for multi-pump control system of water supply. The test results showed that separating precision is 0.856% for two main feature parameters. And an excellent agreement is found with the numerical simulation and the actual test parameters.
Preliminary Study on the Reliability of Automatic Fire Sprinkler System in High-Rise Buildings
Authors: Liu Huan , Huang Xiao Jia , Xie Shui Bo
Published: January 2014

The reliability models and calculation of fire water supply system was introduced to analyze the reliability of four water-supply modes of automatic fire sprinkler system in high-rise buildings. Study results showed that the reliability of fire pump parallel connected system is the highest, which consists with the provision of the code for design of water extinguishing system of civil buildings when the building height is less than or equal to 120 meters. And the methods of improving reliability of fire water supply system were concluded, which benefitted the optimal design of automatic fire sprinkler system.
Research on Multi-Hazard Risk Management Framework for Coastal City
Authors: Zhao Chun Yan , Wang Yin Bang , Feng Qi Min , Liu Ming Qiong
Published: January 2014

Coastal cities have to face many kinds of natural hazards, which always interact with each other, leading to many losses. And rapid development makes city system too complicated to manage for reducing casualties and economic loss. In order to solve the problems in multi-hazard risk management of coastal cities, this paper attemptted to build a new framework based on historical data and hazard-chain theory, and studied the disaster network with the center of typhoon and earthquake. The framework contains a four-dimensional network composed of factor, hazard, event and vulnerability, and related by risk evaluation, chain probability and losses estimation models. The risk analysis for the network was proposed for estimate the influence over the city, aimed at more effective suggestions of planning and disaster reduction.
Numerical Simulation of Airflow Organization Process during Double Highway Tunnel Fire
Authors: Wang Hai Yan , Chen Mei Zhen , Liu Guo Fa
Published: January 2014

Taking Majiazhai double highway tunnel as a prototype, the mathematical model of double tunnel fire is established to analyze smoke plume spread and diffusion during air flow organization process of highway tunnel fire. In the conditions of double tunnel fire jet fans closed, tunnel jet fans open, ventilators of tunnel and cross-road open simultaneously, the temperature field, pressure field and concentration field of air flow and smoke relative motion are obtained. Then it puts forward that the key technology for smoke countercurrent control in double tunnel fire is to increase the ventilation resistance in fire source upwind cross-road and reduce the air quantity flowing from tunnel jet fans into cross-road.
Study on Application of Slopes Stability in Opencast Mines Based on GPS Technology
Authors: Sun Cai Min , Xu Jun , Yang Jun Wei
Published: January 2014

Using GPS technique can monitor geological deformation. Concerning field geological conditions in sinking area, a GPS monitoring network is build up on an open-pit side slope in Qianshui iron mine. By implementing the dynamic monitoring system at regular intervals, the side slope deformation message and its deforming trend can be catch up in time. This paper explains the following procedures for successful completion of a GPS geological deformation project: GPS slope monitoring network design, observation implementing, post-processing of data, and achievements analysis. The results showed that the slope deformation information and development trends can be instantly captured and provide important basic data for Side-slope Stability analysis and reinforcement by aid of GPS technology.
The Evaluation on Emergency Capability of Maritime Emergency
Authors: Wu Jia , Yang Jia Qi
Published: January 2014

Establishing efficient evaluation system of the emergency ability of water emergency is of great importance to strengthen the emergency response ability to maritime emergency of government departments. According to the principles of establishing evaluation index, an evaluation system was proposed on AHP in the article. Then an evaluation model based on AHP and FCE was established, which provided scientific evidences for the emergency management of maritime emergency in the future.
Hazards on Dujiangyan-Wenchuan Highways Induced by Catastrophic Debris Flows on July 10 2013 and Prevention
Authors: Ge Yong Gang , Zou Qiang , Zhang Jian Qiang , Guo Xiao Jun
Published: January 2014

After the Wenchuan Earthquake on May 12 2008, the highways from Dujiangyan to Wenchuan, a crucial passage from Chengdu to Sichuan Western Plateau and Gansu province, are always seriously endangered by landslides, debris flows and their following hazards. Hundreds of debris flows from watersheds, gullies and slopes on July 10 2013 produced fatal hazards and destruction on the Highway G213 and the Express Highway from Yingxiu to Wenchuan. The debris flows are characterized by numerous-occurrence, large flux (645~2238m3/s) and large magnitude (5~126×104m3) as well as the hazard chain process which is composed of debris flow, dammed lake and outburst flood. The highways were seriously destructed and blocked in 16 sites, which were induced by 6 collapsed bridges, 3 submerged bridges, 3 buried tunnel entrances, 1 site collapsed highway base and 7 sites buried highway base or bridges, and the traffic was completely interrupted. Based on analyzing the destruction modes of highways, it was found that the large-scale and potential debris flows and the irrational location of some sections, vulnerable protection measures and low resistant capability of highways against debris flows were responsible for huge highway destructions. Considering the active debris flows in the future at least 5~10 years, it was strongly suggested that potential debris flow identification, integrated management of disastrous watershed, dangerous road line altering, increasing and strengthening protection constructions at dangerous section and improving highway reconstruction standard should be carried out for highway protection and traffic security.
Study on Parametric Variational Principles in Elasticity
Authors: Xue Shou Yi
Published: January 2014

A parametric variational principle is deduced according to the equivalent integral form of all the controlling equations and boundary conditions in elasticity, and by adjusting the parameters, all kinds of variational principles put forward past and some new variational principles can be gained, which means that the method above is more clear in concept, and more concise.
The Flattening Behaviour of Angle Section Beams Subjected to Pure Bending
Authors: Yuan Wei Bin , Chen Chang Yi
Published: January 2014

The flattening behaviour of angle section beams subjected to pure bending is studied in this paper. Analytical solutions for static instabilities of angle section beams subjected to pure bending about its weak axis are derived using energy methods. Nonlinear finite element model using the code ANSYS is developed to simulate nonlinear snap-through instability of angle section beams under pure bending. The optimization assumption about flattening shape of the leg is proposed, through comparison of between the present solutions, experimental results, and the finite element results.
Numerical Simulation on the Regular Pattern of the Lateral Friction Transmission of the Pile in the Incline under the Pulling Force
Authors: Cheng Liu Yong , Chen Shan Xiong , Xu Xi Chang , Chu Xiao Jie , Lei Tong Bing
Published: January 2014

The regular pattern of the lateral friction transmission is one of the most critical influences on the ultimate uplift bearing capacity. The pile foundation in the incline under the pulling force has a wide variety of characteristics which is different with the normal pile. Numerical simulation is done by the use of FLAC3D in this paper. The regular pattern of the lateral friction transmission of the pile in the incline under the pulling force is studied. And the influence factors on the lateral friction transmission such as the slope gradient, the length and location of piles are discussed. The results show that the incline has a great influence on the lateral friction transmission. The lateral friction which is away from the incline-side is about 30% to 50% bigger than the incline-side. The slope gradient and the location of piles all have a great influence on the lateral friction transmission.
Hybrid Boundary Node Method for Analysis of 3D Thin Structure
Authors: Zhang Xi Yu , Sun Tian Can
Published: January 2014

The hybrid boundary node method (Hybrid BNM) is a boundary type meshless method which based on the modified variational principle and the Moving Least Squares (MLS) approximation. This paper apply the Hybrid BNM to thin structures. No plate and shell theories are used. Theory analysis of the feasibility of the Hybrid BNM for thin structures is proposed. Numerical result shows that the Hybrid BNM is suitable for thin structures and high accuracy can be observed.
Multi-Objective Control Method in Structural Strain Interval Reliability Based on Epsilon Algorithm
Authors: Sun Zuo Zhen , Meng Guang Wei , Ma Kai
Published: January 2014

In this article, a kind of structural strain controlled reliability method was presented. The interval extension of multi-objective control algorithm was applied to control the structural strain reliability. The method has realized the goal of controlling the multiple static interval reliability indexes by the control of the structural interval parameters. In order to accelerate the speed of the structural reanalysis, the Epsilon algorithm was used in the process of the structural reanalysis when a wide range of modification happened in the interval parameters. This method can both get a satisfactory accuracy, and improve the speed of the reanalysis. Numerical examples show that the method is effective and feasible.
Stress and Failure Analysis for Pure Bending Tubes of Cylindrically Orthotropic Composite
Authors: Zhang Can Hui , Liu Pei
Published: January 2014

A novel approach is suggested for the stress and failure analysis for the pure bending of composite tubes made up of layers of angle 0° or 90° together with other arbitrary angles. The new unified coefficients as well as their nonsingular parameters are introduced to overcome the problem in an earlier approach where some of the parameters are singular for a few layer orientations even though the stresses and displacements are nonsingular. It is pointed out that such singular terms in the earlier approach cannot be simply eliminated as the conventional technique for the singular terms in the stresses in the form of polar coordinates. Otherwise, the continuity conditions at the interface between special and ordinary layers cannot be satisfied. In addition, the Tsai-Hill theory is employed for the failure analysis. Since the stresses are explicit, it is possible to exactly predict the failure positions so the calculations can be dramatically saved. The flexural stiffnesses as well as the maximum moments and their failure positions of the tube [90/±45/0] with different thickness of every layer are derived for the application and design in engineering.
Inelastic Shear Buckling Strength of Low-Yield-Point Steel Shear Wall
Authors: Shao Jian Hua , He Wen
Published: January 2014

The mechanical properties of low-yield-point (LYP) steel and its advantages as seismic steel are introduced in this paper. The theoretical equations of inelastic shear buckling stress at the pure shear action for the LYP steel are derived from unified theory of plastic buckling. The relationship curve of inelastic shear buckling strength and width-thickness ratio of LYP steel shear wall at the different height-width ratios of plate is given through iteration calculation process. The effectiveness of theoretical equations used for calculating the buckling stress is verified by experimental results.
Kinematic Simulation and Structural Optimization Analysis of Some Kind of Transfer Robot
Authors: Wang Li , Zhang En Guang
Published: January 2014

Based on some kind of transfer robot, conduct virtual assembly and kinematic simulation analysis on transfer robot by using NX software, thus to instruct the practical assembly and control of the robot. Analyze the poor movement stability of robot, point out its flaws of inertial impact and short rigidity. Conduct structural analysis on the original model by using NX software, verify the analytical conclusions, and carry out structural optimization design on the model to improve the products structure.
Sampling Mechanism Design and Analysis of Kinematic and Dynamics
Authors: Liu Yi Zhou , Cheng Jia , Chen Yuan Jie , Huang Zhen Wei
Published: January 2014

Propose a novel way of belt conveyor material sampling.On the basis of sampling theory research ,Design a new type of sample mechanism.It is characterized by effective sample iron ore,coal and other materials on the belt conveyor.Through the study of collision contact characteristics of iron ore , the kinematics simulation experiments were carried out on the designed sampling head by ADAMS,meanwhile the sample head of design parameters were optimized.The result of test shows that the optimal sampling head rotation angular velocity is 340deg/s.when the rotation angular velocity of sampling head between 317deg/s~317.18deg/s,all the materials can be thrown into the storage hopper.
Numerical Analysis on Transient Internal Pressure Character of Sudden Opening Building Suffer Simple Harmonic Excitation
Authors: Duan Min , Wang Xiu Zhen , Wang Jia Qi , Li Ping Shi
Published: January 2014

The theoretical solution of the transient response of the wind-induced internal pressure based on assuming the external pressure is simple harmonic excitation by the linear equation governing the dynamics of internal pressure was presented. The effect of orifice loss coefficient, opening angle, the opening ratio and background porosity factor (Pf) on the transient internal pressure character was analyzed. The result shows: the peak value of the transient internal pressure and the overshooting ratio decreases with the increase of the orifice loss coefficient; the opening angle decides the overshooting effect. The overshooting ratio increases with the opening ratio and presents a decreasing trend while Pf increases; the effect of these factors on steady internal pressure is relatively small.
The Prediction Model of Case-Based Reasoning about Project Evaluation of Xiamen City
Authors: Ye Qing , Liu Jing , Yu Tian
Published: January 2014

This paper was based on construction cost indexes of Xiamen, 11 feature attributes were extracted, including engineering purposes, engineering categories, and 3 predictors including square metre cost. Frame-based representation was used to represent cases. Access was used to build engineering case library. Visual Basic language was adopted to develop object-oriented design. Combined with knowledge guidance strategy and the nearest neighbor algorithm, hybrid retrieval strategy was adopted in basic retrieval and advanced retrieval. When built on case-based reasoning, engineering evaluation model provids a fast and effective method for determining the investment target of project planning and feasibility studies.
The Prediction of Shadow Price Based on Grey Theory
Authors: Xu Chao Yu
Published: January 2014

The shadow price is based on price changes in market prices, "price estimate", which still lag behind the changes in the market price.The paper calculated shadow price sensitive to changes in resource pricesdegrees, through the gray theory GM (1,1) model forecast the market price, and speculated that the estimated price of the next period resources.
The Improvement Measures of the Chinese PPP Project Decision-Making System Compared with Australia
Authors: Qi Xia , Yi Chao , Li Jie
Published: January 2014

PPP project success not only depends on governmental credit and private sectors capability, but also relies on the scientific and reasonable evaluation in early decision-making stage. By thoroughly research on Australia PPP project decision-making mechanism, deficiencies of current policy system, government supervision and evaluation mechanism in decision process of PPP project in china were summarized. Based on the findings, the proposal to improve legal framework, policy and regulation system, institutional settings, evaluation technique system as well as other aspects of PPP implementation were put forward.
The Selection Evaluation of Design Bidding
Authors: Pan Peng Cheng , Shao Yanan , Liu Huan
Published: January 2014

The quality of the project depends firstly on the design. Selected excellent design units can help the owner to realize the projects quality, cost and schedule target. The principles of the evaluation in design bidding were discussed in this paper. The design quality, design fees quotation, design teams service commitments, design teams ability, design institutions strength, and design institutions reputation were given as the six aspects of evaluation index system. last, the organization of evaluator was discusses.
Construction Project Management Actuality and Countermeasures
Authors: Zhang Yong Gang , Wang Yong Hong , Zhao Yuan Yuan
Published: January 2014

Construction project management in China modeled after the foreigner countries. In China, construction project management staff usually in low level, low salary, high responsibility and distrusted by employers. Analyze the reason through the government department, employer, and the project management enterprise. Then suggest that the government should improve the laws and regulations; the employer should give rights to project management engineers; the project management enterprise should promote their staff ability. Finally make project management better service to construction.
Project Management Pattern Selection of Post-Disaster Reconstruction Projects Based on Multi-Dimensions Perspective
Authors: Zhang Xin Li , Jia Li Min , Li Jie
Published: January 2014

This study selects nine indicators impacting on project management pattern selection of post-disaster reconstruction projects. Questionnaire investigation is carried out based on the nine indicators and the needed data for this study is collected. Using factor analysis method, the nine indicators are classified into three main dimensions, which are internal factors, external factors and project goals. Correlation analysis between three main dimensions and six project management patterns is conducted to find the key dimension affecting each management pattern selection. According to the above analysis process, this study provides a selection flowchart of post-disaster reconstruction project management pattern, which may provide a new way for post-disaster reconstruction project pattern selection.
Integration of Facility Management and Project Management as an Effective Management Tool for Development Projects
Authors: Kuda František , Berankova Eva
Published: January 2014

This paper focuses on the possibility of linking Project Management and Facility Management that would result in an operationally efficient design of a development project. Project management tools are used during a construction project when an investment plan is implemented from the idea all the way until it is put into operation. Adding facility management to a construction project leads to a new insight into the project development which works with suggestions of the future operator of the facility from the very first considerations of the investment. The paper aims to highlight the benefits that a project would gain by integrating there two management areas.
Strategies in Using Building Information Modeling (BIM) to Solve Problems in Project Management of Chinese Construction Enterprises
Authors: Shen Li , Lin Ya Xing
Published: January 2014

The application of Building Information Modeling has become a trend in construction industry, it is our duty to accelerate BIM application in recent years. Firstly, the paper generally introduced the concepts and characteristics of BIM, and pointed out the problems that existed in Chinas Project Management of Construction Enterprises, and theoretically, technically discussed the solutions to these issues with BIM technology in a qualitative way. At last, the paper proposed some suggestions and outlooks for the development and promotion of BIM technology in China.
Chaos Synchronization Modle of Complex Networks on Real Estate Investment Systems
Authors: Li Hua
Published: January 2014

This paper gives the complex networks chaos modle on real estate investment systems and brings attention to Chaos synchronizati -on between real estate investment drive system and economic increase response system .The sufficient conditions for achieving the synchroni -zation of two systems are derived based on Lyapunov stability theory .
Application of C90 High Performance Concrete Prepared with Crushed Cobblestone on Shaft Engineering
Authors: Lu Tong Wei , Yang Shao Wei , Qian Wang
Published: January 2014

The C90 high performance concrete was prepared with crushed cobblestone, washed riverbed sand, special mineral admixture. The crushed cobblestone was crushed from cobblestone which particle size was larger than 160mm. The crushing quality coefficient of the cobblestone was above 80%. The gradation of the crushed cobblestone must accord with 5-20mm continuous grading. The compressive strength of HPC90 was above 40MPa in 1d and 103.9MPa in 28d. At the same time, HPC90 had good ability in anti-crack, impervious and anti-freezing-thawing performance.
Test Study on Dynamic Deformation Behavior of Soft Rock-Concrete Sample under Cyclic Loading
Authors: Ding Zu De , Du Yong Gang , Huang Juan , Shi Cheng Hua
Published: January 2014

Considering three contact states of good contact, containing weak interlayer and water, containing weak interlayer but no water, a series of cyclic triaxial compression tests of soft rock-concrete samples for investigation the dynamic deformation behaviors are carried out. The influence of contact states on dynamic properties of combination samples is analyzed based on the dynamic stress-strain curves and accumulative strain curves. The results show that changing the contact states has notable effects on the dynamic strain of the samples. Comparing with the good contact sample, the accumulative strain of the sample containing weak interlayer is about 2 times. The amplitude of the sample vibration increases, while the accumulative strain reduces with the increase of the vibration frequency. It can be noted that the measures such as assuring construction quality, removing weak interlayer and water, keeping good contact state between bedrock and tunnel structure can reduce the settlements and improve the tunnel service life.
Assessment of Geological Environment Bearing Capacity of Fengjie New Town Based on AHP
Authors: Hu Jie , Yang Le , Peng Hai You , Ren Xiu Wen
Published: January 2014

Because of the problems, such as bad geological conditions, great difficulty of construction, and high investment cost, Fengjie new Town has changed the location three times in reservoir resettlement project. Considering the geological and regional feature, this paper first constructs the assessment index system of geological environment bearing capacity; and then obtains the weights of assessment indexes based on AHP; finally through extracting, analyzing and processing the of assessment indexes by means of GIS, gets the zone map of geological environment bearing capacity of Fengjie County Town. The results not only provide an evidence for the construction plan for Fengjie new Town, but also provide a reference for relocated cities of similar reservoir areas and city construction of hilly and mountainous areas.
The Preliminary Study of Combined Effect of Earthquake Disturbed and Subsequent Rainfall on Slope Failure
Authors: Wang Jian Xin , Guo Qi Liang
Published: January 2014

Earthquake and subsequent rainfall infiltration always easily induced slope failure. The paper takes one slope as the studying example to assess the preliminary joint effect of earthquake disturbing and subsequent rainfall on slope failure. Based on the unsaturated infiltration theory, subsequent rainfall unsaturated seepage fields of un-disturbing and seismic slope were simulated separately. The results of earthquake disturbing slope compared with the initial one were discussed in detailed. The conclusion showed seismic slope is inclined to rainfall infiltration, which obviously increased the pore water pressure and induced rise of ground water.
Research on the Ecological Protection Mechanism and Applied of Expansive Soil Slope
Authors: Zhou Feng , Zhang Kai , Tang Ying Chun
Published: January 2014

This paper summarizes and analyzes the basic concepts and ecological protection mechanism for expansion geotechnical slope failure mechanism and the resulting impact on the shallow, traction engineering properties such as analysis, proposed ecological slope of expansive soil slope mechanism of action: vegetation system by improving internal slope soil moisture and temperature changes affect the atmosphere and thus effectively reduce the depth. Vegetation root through reinforced anchoring, delay time and improving soil hydration ductility such as the role played good strength enhancement. Vegetation formation can effectively improve the damaged outer slope interface morphology, to restore the ecological environment and landscape effect. Integrating the past experience on expansive soil slope treatment, this paper provide a slope treatment method used in Nanning metro Tunli section, these will provide reference for the expansive soil slope ecological management.
Using the Finite Element Method Analysis of Tianjin 112 State Line Road Soft Soil Subgrade
Authors: Su Xiao Cheng , Liu Hai Zhen
Published: January 2014

By using the finite element method we had studied the Tianjin Expressway Subgrade Settlement.Through the comparison of the reinforcement and the unreinforced two case we studied the principles of strengthening soft soil subgrade and results show that the mixing pile to improve the bearing capacity of the embankment foundation, reduce the settlement of foundation has played a very good role.The finite element method can reflect the nonlinear characteristics of the coupling effect between composite foundation pile, soil and the soil around the pile, the soil using elastoplastic model, and considering the different medium, different distribution,which has great advantages in the analysis of various factors.The finite element method can better reflect the reinforcement of soft soil subgrade.So ,it also can optimize the engineering design.
The Risk Evaluation Model of Open-Pit Mine Slope
Authors: Chen Xiao Guo
Published: January 2014

This article uses the extenics and fuzzy hierarchy analysis method,on the slope stability analysis method of uncertainty is improved.At the same time,on the measured data report AnTaiBao open-pit mine for practical engineering,using the method of the north, a risk evaluation is made on the stability of slope area.Through the engineering example of calculation shows that,in this paper, the risk evaluation method is reliable and can be used to guide the slope mining design.
Modeling of Rockburst by Elastoplastic Damage Theory at Finite Strains
Authors: Feng Ji Li , Li Chao Jun , Zhang Zhen Yu , Song Zhao Yi , Hao Yong Liang
Published: January 2014

Rockburst is modeled in this paper by the theory of elastoplastic damage at finite stains. Isotropic damage coupled with elastoplasticity is assumed and multiplicative kinematics in a purely mechanical setting is further applied. Merging the finite strain plasticity framework of Simo and the thermodynamics with internal variables of Lemaitre in definition of damage including processes, the Helmholtz free energy is additively decomposed to characterize the basic mechanism of elasto-plasticity and damage of brittle materials. The numerical simulations for granite burst are conducted by finite element technique.
Infinite Slope Stability under Transient Rainfall Infiltration Conditions
Authors: Kong Yu Fei , Liu Jian , Shi Hong Gang , Zhang Long Ying , Zhao Heng , Yang Jun
Published: January 2014

The infiltration process of infinite slopes was studied with modified Green-Ampt infiltration model. The process was divided into two stages, in which the depth of the wetting zone and underground water was calculated. Stability analysis considering different sliding patterns was conducted on the basis of seepage analysis. The safety factor of infinite slopes at different time stages has been derived. Equations in this paper could be used for predicting rain-induced landslides with limited parameters available.
Experimental Research on the Characteristics of Soil Strength Freeze-Thaw Weakening in Songhua River Songpu Bank
Authors: Han Xue , Zhao Zi Long , Gao Zi Rui
Published: January 2014

In order to study characteristics of soil strength freeze-thaw weakening in the Songhua River Songpu bank，basic physical parameters tests and triaxial compression tests were performed on that paragraph bank .The results showed that: after thawing the sample cohesion will drop substantially, the internal friction angle will increase greatly and soil shear strength will increase significantly; the cohesion of sample after repeated freezing and thawing will significantly decline，internal friction angle of soil will greatly increase，the soil shear strength will increase after the first freezing and thawing，with the increase in the number of freeze-thaw cycles, the soil shear strength will significantly decline. The results can provide Songhua slope stability analysis with a scientific basis.