bluuebunny/crossref_metadata_2025 huggingface dataset:
Effective Use of CA System for Control of Water-Jet Cutting Technology
Authors: Novak-Marcincin Jozef , Novakova-Marcincinova Ludmila
Published: December 2013

History of Computer Aided Manufacturing (CAM) becomes from 50th years, when the conception of numerically controlled (NC) machines was designed. This was first impulse for entrance of electronics and later computer technology into the production support. However, more extensive development of CAM systems was enabled by creating the conception of the computer numerically controlled (CNC) production machines which is dated to 1970. Since the CAM systems allow the data about product geometry, which has been created by CAD system, to be used directly for creating NC programs for NC and CNC production machines.
Calculation of the Size of the Sand Resistance Machine
Authors: Wang Xiao Hui , Luo Jun Hong , Zhang Yong
Published: December 2013

This article concludes a calculation method which is suitable for most of the military aerodromes based on the research about the size of setting aircraft stop sand. It also provides suggestions and theoretical basis to the setting of aircraft stop sand in future.
Simulation of Generated Heat by Friction of Explosion-Proof Elevator Ropes
Authors: Zhang Qing Peng , Wan Jian Ru
Published: December 2013

Explosion-proof elevator has been more and more widely used in the flammable, explosive places. Because of the particularity of the environment, in the design of explosion-proof elevator, various approaches are taken to achieve the purpose of explosion-proof, such as explosion isolation and intrinsically safe circuits. Besides, it is important to pay special attention to the collision and friction between various parts of the elevator. As well as elevators traction sheave and hoist ropes, over-speed governor sheave and ropes are also the main parts which generate thermal energy easily when there is friction happened. In this article, a finite element method (FEM) is used to simulate and analyze the thermal energy generated in those two parts with a purpose to test the performance of explosion-proof.
Effects of Nano-Silica Addition and Reactive Diluent Addition on Dynamic Mechanical Properties of Epoxy Nanocomposites
Authors: Chang Huey Ling , Chen Chih Ming
Published: December 2013

Epoxy resin nanocomposite samples containing 0~3wt.% reactive diluent and 0~3wt.% silica nanopowder are prepared. The preparation process is presented for solvent-free and greenmanufacturing. The storage modulus, loss modulus and glass transition temperature of the various samples are then evaluated via Dynamic Mechanical Analysis (DMA). For samples containing 0wt.% and 3wt.% reactive diluent, respectively, 3wt.% nanoSiO2 addition is found to increase the storage modulus by 51.06 % and 22.22 %, respectively. In addition, it is found that the loss modulus is determined principally by the level of SiO2 addition, whereas the glass transition temperature is determined mainly by the level of reactive diluent addition.
Interactive Body Balance System (IBAS) Design
Authors: Faraji Ali , Alam Narges , Fatouraee Nasser
Published: December 2013

Balance disorders which are widespread among old people can be caused by different reasons such as diseases or accidents. Vertigo and falling down are some of the common symptoms. Various products and equipments have been presented in order to diagnose and treatment this kind of disorders. Computerized dynamic posturography system is one of the most popular equipments which is used for diagnosing and measuring human balance and converts them to numerical data output. In order to provide a new and efficient product, this article present a novel design under the title of: IBAS:Interactive Body Balance System by making use of scenario-based design (interaction design). Its ultimate goal is to improve treatment process and make progress in the balance abilities of the users. Also, designing and producing the product in the country considering the Iranian users needs and production limitations brings about a localized production and consequently, a dramatic cost reduction.
Interference-Fit Joining of Aluminium Tubes by Electromagnetic Forming
Authors: Geier M. , José M.M. , Rossi R. , Rosa P.A.R. , Martins P.A.F.
Published: December 2013

Interference-fit joining of tubes by electromagnetic forming is an innovative and environmental friendly technology that can successfully replace conventional joining technologies based on fasteners, structural adhesives, welding and brazing. The technology works at room temperature, allows joining dissimilar materials and offers potential to foster new applications in the assembly of lightweight tubular frame structures. As with all new technologies, there is a need to understand interference-fit joining of tubes by electromagnetic forming in terms of its major parameters with the aim of identifying their influence on the overall strength of the joints and establishing the useful range of process operating conditions. This article investigates the interference-fit joining of aluminum-alloy tubes (AA6082-O) with mandrels made from different metallic and polymeric materials (AA6082-O, AISI1045 and Erlaton 6SA). Results show that the strength of the joint and the associated failure mechanisms are directly related to process parameters and materials.
Research on the Core Method of Lean Construction Management Mode and its Implementation
Authors: Wang Jing , Ma Rong Quan
Published: December 2013

Lean construction is an improvement on the traditional mode of construction of the project, to its use in the construction industry and project management in the study on lean thought construction management mode and implementation method based on lean thinking; origin, proposed the application of lean management in the construction industry on the basis of theory of lean production, through the analysis of the core of lean lean method based on construction management mode, the implementation of lean thinking based on the lean construction, is to realize the objective of improving the management level of the construction industry as a whole.
An Improved Design Method for Automotive Powertrain Rubber Mounts
Authors: Lu Min
Published: December 2013

The objective of the powertrain mount design is to find the geometry which meets the desired stiffness and damping requirements. For the conventional rubber mount, which is composed of a rubber element bonded into a metal bracket, its stiffness can be predicted using FEA but the damping is evaluated by physical testing. This paper introduces a design method at which the damping coefficient of the rubber mount is to be predicted theoretically based on the assumption that the phase angle for a rubber compound is constant. Absence of physical test in this proposed new design process, the development time from concept to production is reduced.
Computational and Mathematical Modelling during Calculation of Margin of Safety as the Way of Decrease in Expenses of Energy during the Operation of Combined Designs
Authors: Yakhnenko M.S. , Snetkova N.V. , Mironov A.V.
Published: December 2013

The accuracy of convergence at the solution of a problem of determination of margin of safety of the rivet composition is operating in the conditions of action of stretching and momentary loading in the plane, the perpendicular plane of composition was investigated. The problem is solved by classical methods and also by method of final elements in the software complex Ansys 12. Difference in specific values of the margin of safety of load on each point of fastener between the theoretical calculations and calculation in the Ansys ystem was from 324,7 to 926,3 percent. Accounting fastener pull reduced the margins of safety by 84,1 percent.
Size Design of Capillary and Barrel of Multi-Function and All-Electric Rheometer
Authors: Li Xiang Gang , Liu Yue Jun , Chen Yi , Zhou Xiao Yuan , Tan Hui , Mao Long
Published: December 2013

Multi-function and all-electric rheometer (MAR) was designed by the authors to study the nonlinear viscoelasticity of polymer melts at high shear rate. It is important to design suitable size of capillary and barrel because it is the calculation basis for some other important parts and determines the shear rate range of MAR. Considering the shear rate range, the entrance pressure correction and the wall slip correction, the length and diameter of capillary and barrel of MAR were designed through particular analysis and precise calculation.
A Convenient Method for Calculating Internal Force of Rod for Tower Crane
Authors: Xue Yuan , Wu Da Qi , Kou Bin , Lu Nian Li
Published: December 2013

This paper made an assumption which considered the structure of tower crane as truss structure and equated the complex spatial structure of tower body under multi-loads to single planar truss structure. The calculation model of internal force of rods was built. The calculation formulas of four types of trellis tower mast configuration commonly used were derived. The result based on the real project given by the calculation formulas agreed with the result given by the finite element software. These explicitly expressed formulas were simple and easy to calculate by hand. An accurate and efficient method to calculate internal force of rods of tower crane was provided.
Analysis of China PV Application Market Development Support Policy Based on NPV Model
Authors: Zhang Yu Hua , He Hua Meng
Published: December 2013

In recent years, excessive expansion of the PV industry makes photovoltaic products in oversupply condition, coupled with anti-dumping investigation of the United States and Europe, china PV industry fall into the bankruptcy plight. In order to stimulate the development of domestic PV application market in a short time, China has introduced a number of PV support policies; however, compared with Germany in policy design, China's PV support policy system is too rough, Apart from a number of demonstration projects, PV application market is far not formed. Therefore, the PV support policies require a more detailed design. This paper aims to discuss the current related problems of china PV support policy based the NPV model, than propose countermeasures and suggestions. This paper argues that the government needs to develop NPV model-related implementation details for different types of participants. The government should attach importance to the development of small household systems (SHS).
Vibration Fatigue Analysis of the Structure under Thermal Loading
Authors: Zheng Min , Shen Fan , Luo Pei
Published: December 2013

The fatigue problem of structures under concurrent thermal and vibration loading has not been thoroughly studied even though it is common in applications of aero-engine combustor liners. Here we attempt to explore such a problem using a simplified combustor liner model that is implemented by the commercial finite element software ANSYS Workbench. The modal parameters at various temperatures are calculated and the fatigue behavior under stochastic base excitation and thermal environment are analyzed. The results show that thermal loading not only has an effect on dynamic characteristics but also reduces the vibration fatigue life of the structure.
Research of a New Theoretical Model of Innovative Design Methodology
Authors: Zhang Hai Bin , Xiong Xing , Zhu Pi Liang , Kong Fan Rang
Published: December 2013

Innovative design refers to give full play to the designer's creativity, using humans existing science and technology achievements (the theory, method and technology principle, etc) to find innovative ideas, and design a scientific, creative, novelty and practicable product. With the rapid development of modern knowledge in many industries, having higher market occupancy also becomes more and more difficult. So it requires immediate talent team having enough innovative ability and innovative ideas. [1,
Innovative design methodology, the objects of this research, makes the engineering design divided into four processes that are Object Design, Conceptual Design, Parameter Design and Optimal Design. In the process of designing new products, a substantial amount of professional knowledge, and reasonable selection of the knowledge which is mastered, using the knowledge, getting more familiar with the four innovative processes are all very important to innovative design and also the development of new products. And here, in the process of Sports Equipment Design, this design methodology can make the designers more inspired and having a more distinct thought.
The Research of AlN-Mo Nano Composite Ceram
Authors: Xin Chun Yu
Published: December 2013

In this paper six sides top technology of high temperature and high pressure, in AlN nanopowder mixed with Mo powder, synthesis of AlN - Mo. Nanocomposite ceramics Using X-ray diffraction (XRD), scanning electron microscope (SEM) and vickers hardness instrument of AlN - Mo in the nanocomposite ceramics phase structure, morphology, size and hardness of the characterization, compared with AlN nanoceramic, discusses the AlN - Mo of nanocomposite ceramics new features.
A New Approach to Characterize Moisture Management Properties of Diaper
Authors: Hui Patrick Chi Leung , Liu Na , Yu Yong , Choi Tsan Ming , Ng Sau Fun
Published: December 2013

Diapers become popular and widely used in healthcare during the last few decades. It is critically important in healthcare management to monitor the incontinence conditions of frail elderly. This paper aims to model the wetness-time relationship via scientific experiments by a newly devised wetness sensor and to work out an effective way for the prediction of the volume of urine voided. Physiological saline is used to emulate the urine voiding. This study provides a way for monitoring the incontinence conditions of the elderly and can be used to improve the effectiveness of clinical management system by the application of smart diapers with build-in sensors.
Analysis on Induced Stress Field by Pore Pressure Change of Sandstone Reservoir
Authors: Jin Juan , Liu Jian Dong , Zhang Guang Ming
Published: December 2013

More and more seismic and log data analysis showed that for high pressure water injection reservoir, the injected water interact with the rock in the process of fluid flowing into reservoir. The pore pressure in rock pores and cracks will be changed, resulting in the change of rock skeleton stress. On the one hand this phenomenon will lead to the changes of reservoir rock physical mechanics properties; on the other hand, it will causes stress redistribution in the vicinity area, and the additional stress may load on the casing which brings out casing damage or causes cracks open or shut-down and fault slip. All of these could result in severe engineering accidents. To analyze the effects of flow field change on corresponding stress field during conventional reservoir development, numerical simulations and theoretical analysis method were combined to study the flow induced stress change of sandstone reservoir during development. The calculated results were compared to each other to validate the correctness of the two models. Analytical solutions and simulation results present the magnitude and orientation of stress and the distribution of differential stress around a single well, and illustrate the change rule of stress field with the variation of flow field. We also illustrate the stress distribution of two wells using numerical simulation results to understand the well interference.
The Theoretical and Experimental Research on Accelerated Life Test of Collapsible Fabric Tank Storage Life Based on Reliability
Authors: Zhang Shi Fu , Liu Tian Min , Zhang Qi Xin , Shu Xiu Mei , Song Shi Qiang , Han Zhi
Published: December 2013

Collapsible fabric tank which is an important part of oil equipment equips army with large reserves. The evaluation of collapsible fabric tank storage life, lacking of corresponding test data support, is on the conservative side, which causes manage and storage uncertainty to army. Based on reliability theory, storage life evaluation method of collapsible fabric tank is established. Failure data of collapsible fabric tank under several accelerated stress levels is obtained. According to probability distribution hypothesis test, Weibull distribution has better goodness of fit and life prediction model is obtained. A new maximum likelihood estimation is proposed as statistical analysis method and model parameters are evaluated. Storage life and reliability index of collapsible fabric tank under normal storage temperature are evaluated which brings collapsible fabric tank storage life potential into play and improves use economy.
Analysis on Avoid Incision in Underground Engineering Reinforcement Technique against Cutting Resistance
Authors: Wang Bo , Zhang Yong , Liu Hong Wei
Published: December 2013

In view of serious degree of mouth formation rock weathering, poor stability, the construction excavation characteristics such as easy to collapse of underground engineering, incision reinforcement technology is used in underground engineering in the mouth period of construction, which changes the mechanical properties of surrounding rock and improves the penetration resistance of surrounding rock. Using three dimensional finite element program (ls-dyna) numerical simulations show that the stratified structure of the grouting tube in the surrounding rock is similar with covering layer thickness steel ball, which makes the projectile yaw in the process of penetration movement. As is shown through comprehensive calculation and analysis, the zero incision reinforcement technology can make the penetration resistance of the underground engineering mouth period increased by 30% ~ 40%.
Linear Matrix Inequality and its Application in Control Theory
Authors: Wang Hai Yan
Published: December 2013

As a result of linear matrix inequality (LMI) and its good nature of mathematics as well as the breakthrough of solution method, many control problems can be transformed into a standard LMI problem to solve. Linear matrix inequality has received widely attention and applications in control system analysis and design. This paper introduces some of the basic content of LMI, such as the general description, the relevant algorithms and software. The controller will be designed using LMI such that the closed-loop system is asymptotically stable, and simulation will be given using Matlab. Finally, the population model will be given and analyzed.
Study of Fault Arc Protection Based on UV Pulse Method in High Voltage Switchgear
Authors: Xu Cheng , Sun Jia Xiang , Wang Jin Gang , Luo Yi
Published: December 2013

Based on the relationship between electrical equipment discharge and ultraviolet radiation, this paper proposed the use of UV pulse method to detect switchgear arcing faults. Switchgear protection system based on this new technique detects arcing faults by analyzing the ultraviolet produced by electric arc. The technique was implemented and tested in laboratory, and results verified the performance of the protection system; its capable to calculate the number of UV pulses and cut off faults fast and precisely.
Intelligent Aquaculture Monitoring System Based on Fieldbus
Authors: Zhou Ling , Xing Ying
Published: December 2013

This paper analyses the status of aquiculture in China and gives out some of its potential problems. In order to over these problems, Industrial fieldbus and Intranet technology are used in this paper to achieve the hardware and software design, as well as control strategies for factory aquaculture. It applies WEB server, database server and browser to establish the management platform for environment control and production process. The whole system was successfully verified at Zhenjiang production base. Through a real-time control of dissolved oxygen, temperature and PH in pond, this system stabilizes these parameters at each own optimum values, and dramatically improves the overall productivity. The test results show that this system is easy-operated and user friendly, it provides a direct and practical measure for aquiculture, and saves energy as well.
A Survey on Randomized Sampling-Based Path Optimization Methods
Authors: Yan Fu Yu , Wu Fan , Peng Fei , Zhu Zhi Jie
Published: December 2013

Randomized sampling-based motion planners could efficiently generate collision-free motion paths. However, these paths have some quality problems (with respect to quality measures, such as path length, clearance and smoothness), especially in high dimensional configuration spaces. Thus, researchers studied some path optimization methods to improve path quality and to make paths suitable for practical applications. This paper reviews some of the most influential path optimization methods and gives an overall perspective on the most widely used ideas in the field.
Three-Dimensinal Structure Modeling of Lishui Depression, East China Sea Basin
Authors: Xu Fa , Li Xue , Zhang Jin Liang , Zhang Guang Xue
Published: December 2013

Fine reservoir description plays an important role in oil and gas exploration and development, reservoir geological modeling is the core of fine reservoir description and the new technology developed in recent years of quantitatively characterizing reservoir as well. Petrel can be used to build three-dimensional visualization of quantitative reservoir by simulating and forecasting the reservoir characteristics and properties of parameters .And the reservoir unit is the targets of system modeling used to guide the re-awareness and tapping of the potential reservoir. This article describes three-dimensinal structure modeling of Lishui Depression East China Sea Basin with the help of powerful 3D visualization capabilities and integrated functional modules of the exploration and development, and results of case study show that the three-dimensinal structure model consists with its actual geological information, thus providing strong support for exploration and development of decision-making.
Application of Operator Libraries on Laminate Strength Optimization of Composites
Authors: Wang Gong Dong , Wang Jun , Chen Hao
Published: December 2013

An improved Memetic algorithm is applied in this article. Mathematical model is proposed to optimize the laminate strength. The composites laminate strength optimization system with local operator library and rule operator library has been developed by the object-oriented programming with C++. The local operator has contributed to increase the convergence rate and the rule operators have contributed to implement practical design aspects in optimization of laminated composite plates. A numerical example demonstrates the validity of optimization model and practical applicability of the improved Memetic algorithm; hence, exhibiting the improvement of the method in tackling the stacking sequence.
Preparation and Characterization of Diatomite Supported Cu-Doped TiO2 Photocatalysts
Authors: Deng Yan Xi , Liu Chuan Chuan , Yang Guang
Published: December 2013

Diatomite supported Cu-doped TiO2 photocatalysts were synthesized by sol-gel method and characterized by X-ray diffraction (XRD), SEM and UV-vis diffuses reflectance of spectroscopy (DRS). The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue solution under visible light irradiation. The results show that TiO2/diatomite ratio had a great influene on their photocatalytic activities. All prepared Cu-TiO2/diatomite had a better photocatalytic activities in comparison with Cu-TiO2 and the Cu-TiO2(30)/diatomite had higher photocatalytic activity than others. The photocatalytic degradation of methylene blue is due to the breaking of the chormophoric group, rather than the simple decoloration.
Fabrication of Nano-branched Coaxial Polyaniline / Polyvinylidene Fluoride Fibers via Electrospinning for Strain Sensor
Authors: Huang Rong , Long Yun Ze , Tang Cheng Chun , Zhang Hong Di
Published: December 2013

Soft conductive elastomer materials have wide potential applications in material science and electronic engineering. Through electrospinning and in-situ polymerization, a kind of well-organized coaxial polyaniline/polyvinylidence fluoride (PANI/PVDF) microfibers with conductivity about 0.6 S/cm were fabricated, which combined the advantages of conducting polymer and elastic material. It is found that the resistance of the fibers was changed with the curvature variation. The results indicate that the PANI/PVDF microfibers could be used as strain sensor with high flexibility, high sensitivity, and stable repeatability.
Power Law and Stretched Exponential Responses in Composite Solids
Authors: Suárez-Antola Roberto
Published: December 2013

Clay, rocks, concrete and other composite solids show evidence of a hierarchical structure. A fractal tree of nested viscoelastic boxes is proposed to describe the elastic after-effects in these composite solids. A generalized fractal transmission line approach is developed to relate the strain and stress responses. Power law for strain, under an applied stress step, is derived. The exponent in the power law is obtained as a well-defined function of the branching numbers and scaling parameters of the viscoelastic hierarchy. Then, a composite solid with both instantaneous (linear) elastic strain response and power law type (linear) elastic after-effect for an applied stress step, is considered. The stretched exponential stress relaxation to an applied strain step is derived as an approximation. For the same composite solid, the stretch parameter of the stretched exponential and the exponent of the power law result to be equal to each other.
Optimal Design of Double Sheet Piles in Deep Foundation Pit Based on UD-SVM
Authors: Yu Zhi Hua , Gui Yue , Wang Zhao Chang , Hou Ying Jie
Published: December 2013

In allusion to double sheet piles(DSP) global optimal solution, the response surface(RS) technique based on Uniform Design- Support Vector Machine(UD-SVM) was introduced to build the RS by nonparametric regression, thus to avoid the complex non-linear RS form between the double sheet piles parameters and indexes under the current standard. Use the Monte Carlo simulation as generator to produce samples, the RS can do considerable and non-repetitive efficiency prediction and get global optimal value satisfying to the target value with high accuracy and stability, also without figuring out the explicit formulations. This article applied the method to a double sheet piles optimal design, and took minimum engineering quantity as criterion to screen for the optimal parameters aiming at illustrating the feasibility.
FE Modeling of Elliptical Concrete-Filled Steel Tubular Members Subjected to Pure Bending
Authors: Zhao Xiong , Li Xu Kuan , Ren Qing Xin , Cheng Tai , Long Xiao Lian
Published: December 2013

This paper reports a finite element analysis of the flexural behaviour of concrete-filled steel tubular members with elliptical section. A set of test data were used to verify the FE modeling. generally, good agreement was achieved. Typical curves of moment (M) versus deflection at mid-span (um), as well as stress distributions of steel tube and concrete of the composite members were compared and discussed. The results clearly show that the FE model is available for predicting the load-bearing capacities and the failure modes of the specimens.
Research and Development of High Grade Gear Steel SCM420H for Automobile
Authors: Fang Chen , Shi Jian Hong , Zhu Lei
Published: December 2013

ShouQin Metallic Material Co., LTD developed the high grade gear steel SCM420H for car manufactured by electric furnace compact processing route process. With the process measures such as beneficiated material principle, making foamed slag in smelting process, over roll-protection casting and electromagnetic stirring in and control coolness velocity after rolling, the results show that steel reach to high quality level with high pureness, hardenability and malleability well cooperated.
Measured Data Processing in Civil Structure Using the DOProC Method
Authors: Čajka Radim , Krejsa Martin
Published: December 2013

This paper describes the use of measured values in the probabilistic tasks by means of the new method which is under development now - Direct Optimized Probabilistic Calculation (DOProC). This method has been used to solve a number of probabilistic tasks.
DOProC has been applied in ProbCalc a part of this software is a module for entering and assessing the measured data. The software can read values saved in a text file and can create histograms with non-parametric (empirical) distribution of the probabilities. In case of the parametric distribution, it is possible to make selection from among 24 defined types and specify the best choice, using the coefficient of determination. This approach has been used, for instance, for modelling and experimental validation of reliability of an additionally prestressed masonry construction.
Research on Monitoring and Control for Suspender Cable Tension of Half-Through Concrete Filled Steel Tube Arch Bridge
Authors: Zhao Fu Li , Xiang Yi Qiang , Wu Qiang Qiang
Published: December 2013

The measurement accuracy of the cable tensions in the hanger rods of concrete filled steel tube arch bridges is important for the correct evaluation of bridges condition. Based on Jinpan Bridge-a half through concrete filled steel tube arch bridge with 80 m span in Tiantai, it was put forward the vibration frequency method for testing and evaluate suspender tensions with the help of analysis vibration characters of the suspender. The precision of cable force calculation formula was verified after comparing the practical tension with the designed tension obtained from tension jack method. Then, according to the test results and values predicted by the presented cable force calculation formula, the cable tensions were adjusted. Cable tension test results in the finished bridge show that this method is feasible.
The Mechanical Mechanism Analysis for Mortar Arch Framework Slope Protection Structure
Authors: Xu Yang , Li Ding Ling , Peng Li , Xiao Yan , Nie Yi Hua
Published: December 2013

The finite element analysis model was built as the real scale for mortar arch framework slope protection, and the displacement and strain at different points were collected by vertical loading pressure. So the mechanical mechanism can be studied, and the analysis was done between calculation results and testing results of solid miniature model. The studying results show that the point on the arch foot is the worst stress place for each arch, and the total displacement increase nonlinear as the distance from the slope top increases, and the bump phenomenon exists in the bottom of slope, the points are likely to be broken.
Study on the Static Load Test of Bridge Inspection
Authors: Liu Fan , He Xiao Hong
Published: December 2013

Combined with practical experience in engineering, this paper analyzed the necessity of the bridges for detection with the use of on-site static load test. Also, it introduced the content and methods of the trial, as well as the studied domestic and international inspection techniques, thus discovering the engineering mechanical performance for bridges.
Modal Parameter Identification of Civil Engineering Structures under Seismic Excitations
Authors: Pei Qiang , Li Long
Published: December 2013

Modal parameter identification of civil engineering structures under seismic excitations has important implications for health diagnosis, plastic analysis and optimization design of structure. A numerical simulation model of frame construction was carried out. Apply two types of seismic waves on the structure. The seismic excitations are Kobe wave and Shanghai wave which are both generated by actual earthquake records. According to the acceleration response of the layers, the first three order modal parameters can be identified by using complex exponential method. Compared the results with theoretical values, and analyzed the accuracy, the method was considered to have an effective application.
The Regression Prediction Analysis of Grouting Concretion Stone’s Strength Based on SVR
Authors: Lei Jin Sheng , Chen Jian Fei , Cao Xue Ting , Wang Qian Feng
Published: December 2013

Cement-based grouting material is used for the grouting of gravel soil, and do compressive strength tests for the grouting concretion stones. Use the method of support vector machines for regression (SVR) to deal with the test data and predict the grouting concretion stones strength. Specific methods are as follows: randomly select 20 groups of the specimens for training, the remaining specimens for predicting, and then establish the relationship between the performance of soil body medium, grouting materials, grouting pressure and strength of concretion stones strength. The research results show that the support vector machines method can judge the sensitivity to impact indicators of grouting stones strength, and predict and analysis the grouting stones strength under multiple factors.
Analysis of the Tunnel Disease Considering the Unsaturated Loess Matric Suction Effects
Authors: Xue Xiao Hui , Su Zhong Ming , Sun Zhi Jie , Song Fei
Published: December 2013

In order to analysis the internal relation between the matric suction change and the tunnel disease, the paper combines the Dayoushan tunnel as an engineering example, uses the mathematical, field monitoring and model shear test and to analysis the the change rule of the martic suction and the influence of martic suction on the tunnle supporting force and plastic zone. The results show that when the water content is increasing, the unsaturated loess matric suction is reduction, the force of tunnel support is increasing and the radius of plastic zone is increasing. Due to the influence of surface water infiltration, the matric suction of the around soil in Dayoushan tunnel is reduction and cause the crown settlement, landslides and lining cracks. The disease treatment mainly lies in keeping the drainage system is smooth and secure for waterproof. For the similar unsaturated loess tunnel, the research results have reference significance.
A Discussion on Numerical Simulation of Axial Reinforcements in RC and RCFT Columns
Authors: Xiamuxi Alifujiang , Tuohuti Akenjiang , Hasegawa Akira
Published: December 2013

In numerical simulations of reinforced concrete (RC) columns with ADINA, when the REBAR element model is applied to simulate the reinforcement, the load-displacement curve of RC is similar to that of concrete, without reflecting the contribution of reinforcement. Therefore, employing another element model-BEAM element model for reinforcement, nonlinear analyses of RC columns are carried out and compared against the REBAR element model. The nonlinear analysis of reinforced concrete filled steel tubular (RCFT) columns, then, is performed with the BEAM element model. Meanwhile, the axial compression tests of concrete, RC and RCFT columns are also conducted to validate the nonlinear analysis. Comparing the results of nonlinear analysis against the results of experiment, it is concluded that the BEAM element model can simulate the reinforcement more reasonably than REBAR element model and can be applied to the nonlinear analysis of RCFT columns.
Classification Model for Estimating Demolition Waste Generation Considering Structure Types and Wall Material of Detached House by ANOVA Analysis
Authors: Cha Gi Wook , Hong Won Hwa
Published: December 2013

Construction activity in South Korea must entail the process of demolition. There is such a high sense of awareness of the importance of managing ever-increasing quantities of demolition waste. To ensure efficient management of demolition waste, it is critical to quantitatively estimate the amount of demolition waste. Based on such need, this study examined the sub-divided categorization models to predict the amount of demolition waste generation rates (DWGs). For the execution of study, the present researchers collected the data on DWGs from 394 buildings based on the mass balance principles. On the basis of the collected DWGs data, ANOVA analysis was performed to compare mean differences in structure and wall materials. Results of the analysis showed that the amount of DWGs varied, depending on the structure of buildings and the wall materials used. The results also indicated that describing even a single type of DWGs discarded from buildings would require multiple estimation models for demolition waste generation.
Research on Civil Engineering with Constructing Eco-Village Development Model in Shaanxi Province
Authors: Song Qi , Yang Yang
Published: December 2013

The rural ecological environment protection, economic sustainable development and eco-village construction need to be explored. Based on the concept of eco-village and eco-village model, the existing eco-village construction models in Shaanxi Province can be classified into four categories: comprehensive development model, modern ecological technology applied model, suburban farmhouse model and folk culture model. The issue during those models development been analyzed. Suggestions of promoting ecological village construction in Shaanxi Province been proposed.
Study Progress on Modern Green High Performance Concrete at Domestic and Foreign
Authors: Fu Zhao Yu , Huang Mei Ling
Published: December 2013

Recycled concrete is one of the main measures to develop ecological and green concrete, also it is one of the useful ways to obtain sustainable development of buildings, resources,and environment . Conforming to this idea , it is increasingly being valued by engineering and became one of the hot concrete research. In this paper, we start with the concept of green high performance concrete , taking high performance concrete in green cementitious materials, aggregates and admixtures point to cut in ,and describing the characteristics of green high performance concrete and its research situation in details. Besides,on the basis of combining the domestic and foreign development of green concrete,I will point out the problems in the currentre research of recycled concrete .Then Ill give the corresponding countermeasures and propose sustainable research and development proposals by emphatically analyzed the research status and application of recycled concrete at domestic and foreign .
Study on Civil Engineering with the Comparison and Inspiration of Domestic and Foreign City Underground Space Development
Authors: Dong Xiao Li , Wang Rui Hua , Yuan Ze Xun
Published: December 2013

With the development of city, city population, regional planning and city ecological environment are facing with more and more tremendous pressure, so the development and utilization of city underground space has become common concern. In recent years, underground structures have been widely applied in the fields of city construction, transportation, defense engineering, water conservancy project etc. Many countries in the world have been the development and utilization of underground space as an important way to intensively implement the land resource and sustainable development of the city. In our country, there is still very great potential of underground space development and utilization of underground structure.
Application of Dynamic Load Test in the Bridge Detection
Authors: Miao Tian Ming , Zhou Ying
Published: December 2013

This practice mainly uses the analysis research on the dynamic characteristics of bridge structure fluctuation test, determination of natural frequency, damping ratio, mode of vibration of bridge structure, dynamic impact coefficient, response (acceleration, dynamic deflection) test parameters, thus judging the whole bridge structure stiffness, operating performance.
The Stability Control of Soft Soil Foundations of Urban Roads According to the Surface Subsidence Monitoring Data
Authors: Liu Hong Jun , Tan Jin Hua , Su Xue Wen , Wu Hao
Published: December 2013

Two typical monitoring sections are selected for obtaining the change law of the surface subsidence and the settlement after construction of soft soil foundations, and determining the reasonable unloading time. The research results show that the surface settlement rate is large during the filling stage, the rate decreases after the loading and gradually stabilized. The embankment midline settlement is larger than the settlement of the road shoulder which is concluded from the fact that the subsidence of the middle settlement plate is larger than those of the left and right plate. The surface subsidence rate is less than 5mm per month during the two month before unloading according to the data in the tables. The settlement after construction presumed from the middle plate is more significantly larger than that of left and right sides, hence, as the unloading basis of preloading drainage method in soft soil foundation treatment the settlement after construction which is calculated from the midline monitoring data of the road is appropriate. After 6 months the calculated post-construction settlements of the two sections are in the scope of the design requirement since they decrease with preloading time. The reliable basis is provided for the future design and construction of soft foundation in this area through the research results.
Study on Internal Force Effect of a High-Speed Rail (40+56+40) m Prestressed Concrete Continuous Beam Bridge
Authors: Zhao Yong Ming
Published: December 2013

The continuous beam bridge is a kind of bridge type used widely on the project. With the design theory and construction technology, prestressed concrete continuous beam bridge shown strong vitality. This design is a high-speed rail (40+56+40) m prestressed concrete continuous beam bridge design, whose width is 12.2m and its maximum Design speed is 300km/h. The form of the railway is double line which is 4.8m far away, and the cross-sectional slope is 2%.ZK load was applied on the bridge. A three-span P.C continuous Beam structure with variable cross-section is used in this bridge. The girder body adopts single cell and single box, the height of beam takes quadratic parabola relation, which is 5m high at the middle fulcrum, while at the side fulcrum and the mid-span is 2.5m. The design uses Midas/Civil to establish the finite element model that is reasonable and simple, analyzing the structure behavior of the girder body under loading, especially the internal forces of bridge structure under dead load, live load and additional force.
The Influence of Ratio of Reinforcement to Modulus of Elasticity of Reinforce Concrete Component
Authors: Qu Tie Jun , Xu Rong Huan
Published: December 2013

Modulus of elasticity is an important mechanical parameter in analysis and design of reinforce concrete structures. The present value of modulus of elasticity ，which has rare relation with ratio of reinforcement ，is based on plain concrete. Authors deduced an equation between modulus of elasticity and ratio of reinforcement, and then an experimental study was conducted on 11 groups’ component of reinforce concrete with different ratio of reinforcement. At last, an equation for modulus of elasticity of different ratio of reinforcement determined by regression, using least squared method, was described. A cantilever, whose dynamic characteristics and response were calculated, was taken as an example to analyze influence of ratio of reinforcement on the structural analysis .Result shows that ratio of reinforcement has effect on modulus of elasticity . Moreover, if general modulus is ignored when calculate dynamic response, it will cause deviation.
The Application and Development of Ultra-High-Performance Concrete in Bridge Engineering
Authors: Jia Li Jun , Hui Hai Bo , Yu Qian Hui , Song Yan
Published: December 2013

Ultra-High Performance Concrete (UHPC) is a relatively new kind of matierials with excellent mechanical and durability performance compared with the conventional concrete. By making a comparison with the conventional concrete ,the compressive strength of UHPC may reach about 200MPa,which is its significant advantage and potential in applications of bridges. The performance of high tensile strength (especially with some steel fibers) enables the UHPC members to absorb energy and resist impulsive loading. In addition, because of the low porosity, the durability of the material is excellent. Based on collecting and analyzing international research results. the materials and production, and mechanical properties of UHPC were summarized. Together with a general introduction of existing international projects ,the summarization provides a comprehensive reference to further application and development of UHPC products.
Reservoir Volume Estimation in Exploration Phase by Monte Carlo Simulation
Authors: Zhao Lei , Li Bing , Diwu Peng Xiang
Published: December 2013

The STOIIP determines the scale of civil engineering in the oilfield, so the accurate calculation STOIIP has a very important significance on civil engineering, especially in the exploration phase few data are available in oilfield, traditional volume calculation method is hardly to provide a reasonable result. The mathematical statistics method, namely Monte Carlo simulation is introduced to calculate reservoir volumes for hydrocarbons in place (STOIIP or GIIP). This method can provide several volume results by monte carlo sampling. making the resource assessment results a probability distribution rather than a single valuation, which greatly improve the credibility and usefulness of evaluation results. The S oilfield in Malaysia are evaluated and the results show the P50 STOIIP is 4.82 MMbbl.
Study on the Optimal Design of the Members of Contaniner Building with Building Materials I: Side Board Optimization
Authors: Zha Xiao Xiong , Zuo Yang , Chen Shi Yun
Published: December 2013

Container, as a light steel structure, being increasingly used in building construction, containers used in construction has many advantages and applications. However, the current study mostly from the view of the architecture, as for the mechanical properties of the container building has not mentioned, that brings obstacles of the application and development of the container building. Based on the software package of HyperWorks and optimization design theory, the cross-sectional size of container building is taken as design variables, and then selected objective function and constraint functions. Finally, calculated by software, get the optimal cross-sectional dimension.
Study on Synchronized Grouting Pressure to Segments of Shallow EPB Shield Tunnel
Authors: Yang Hai Xing , Cao Jing , Liang Bo , Ding Zu De , Zhao Hui Ming
Published: December 2013

Based on Terzaghi's theory on loosening earth pressure, two failure modes of soil upon shallow EPB shield tunnel caused by synchronous grouting are analyzed, and the theoretical equations of synchronous grouting pressure is built to calculate the maximum and minimum grouting pressure which correspond to the limit states of subsidence and upheaval failure. Combined with a shield tunnel construction practice, the theoretical and measured values are compared. The results show that the theoretical equations are valid and can provide a theoretical approach for the parameters of shield synchronous grouting.
The Experimental Study on Internal Force Redistribution of High Strength Steel-High Strength Concrete Continuous Composite Beam
Authors: Shi Qi Yin , Meng Qiu Wei
Published: December 2013

To study the internal force redistribution of high strength outer-plated steel-high strength concrete continuous composite beam, static load tests of two continuous composite beam specimens were conducted. The paper analyses the causes of internal force distribution of continuous composite beams. By using high strength steel and high strength concrete reasonably, plastic strain on sections of both the negative and positive maximum moment got fully developed at the load-bearing limiting state, and the continuous composite beams have sufficient plastic rotation ability and ductility to develop full moment redistribution.