bluuebunny/crossref_metadata_2025 huggingface dataset:
Research Review on Bearing Capacity Behavior of Pile Foundation under Lateral Load
Authors: Zhang Jian Wei , Yuan Hua , Zhang Shi Hong
Published: November 2012

Based on review of current study on pile foundation under lateral load, an introduciton is given to some theoretical methods commonly used at home and aboard, with emphasis placed on the elastic subgrade reaction method and the p-y method as well as their characteristics and applicability, and some problems needed for further study are put forward. The present study provides a train of thought for further research on the behavior of large-diameter pile under lateral load.
Experimental Investigation on Damping Effect of NOPD Slender Cables
Authors: Zhao Ling , Shen Dan , Ma Tie Jun
Published: November 2012

Vibration mitigation of slender cables using the non-obstructive particle damping technology was investigated by the free vibration experiments for the NOPD steel wire. The increased cable modal damping ratios attributed to NOPD were measured and analyzed. The influences of factors such as particle filling ratio, particle mass ratio and initial deviation displacement on the damping effect are discussed by means of test data. Test results demonstrate that the particle filling with a suitable filling ratio or mass ratio to the cable can significantly improve the damping of the cable. Either particle filling ratio or mass ratio is a principal influencing factor for the damping effect of the cable. Under the same particle filling ratio and tube diameter, the larger initial deviation displacement is generally advantageous to the damping effect of wire, especially at the suitable particle filling ratio.
Evaluation of a Rail-Damper for the Vibration Reduction and Noise Suppress for Railway
Authors: Xue Qiang , Sun Fei Yun , Wu Jian Li
Published: November 2012

It is necessary to control the noise and vibration with a high frequency caused by various trains, not only nearby the railway, but also in the station area. An innovative rail-damper was fabricated and evaluated for its effectiveness in vibration control and noise suppressing. From a long-term monitoring, rail-damper can reduce effectively the vibration and noise acceleration level, both along tracks and in platform. The results indicated that as the track was masked by the rail-damper, the train noise equivalent sound level can be reduced more than 3.6 dB, and the vibration acceleration level could be reduced by an average of 6.7dB. For the vibration of the platform, the acceleration level was reduced by an average of 9.3dB. The rail- dampers can preferentially reduce the high-frequency part of the site vibration. The study herein would be useful to understand the feasibility of rail-damper for the noise and vibration control for the railway engineering.
Reliability Analysis of Turbine Generator Units Spindle System with Vibration Fault Tree
Authors: Li Zhao Jun , Liu Yang , Long Hui , Zhang Yu Ling
Published: November 2012

With the rising of single-machine capacity ,the structure of turbine generator units has become increasingly complex, and mechanical failure problem has been rapidly concerned among engineers. This paper develops a fault tree in vibration for turbine generator units by analyzing failure cause, which regard rotatable part as a group. In this study, the feature of failure is summarized to realize the whole system, and an example is examined at the end of paper. Through the qualitative and quantitative analysis shows that, the failures of turbine generator units are complicated and correlative, the vibration of rotatable parts is the most important factor affecting the stable of turbine generator units, and system reliability is associate with the structure of fault tree and the probability of basic events .
Prediction on Sound Insulation to a Single-Leaf Wall
Authors: Huang Xian Feng , Yang Zong Xiao , Yang Yan
Published: November 2012

High sound insulation performance of a wall is one of the significant goals of the architecture design. For exploring a reliable sound insulation prediction method to a single-leaf wall, this paper introduces the coincidence effect in the calculation. This method can predict the wall’s sound reduction index easily, and depict the coincidence effect of a wall especially. Meanwhile, it is shown that the prediction method might be applied to the practical building acoustic design.
Research on Influence Factors of Strata Classification Based on Fuzzy Cluster Analysis and Fuzzy Pattern Recognition
Authors: Liu Shuang Yue , Chen Li Na
Published: November 2012

Traditionally, it is usually depended on engineers’ personal experience and habits to establish the strata layers on the basis of the original data when they doing the desk studies of a site investigation work, which are greatly subjective and nondeterministic. A method in combining the fuzzy cluster analysis and fuzzy pattern recognition is presented to classify stratum. Firstly, the sample integration is classified by adopting clustering analysis method. The fuzzy model is set up for different degree. Afterwards, the undetermined forecasting sample is predicted by applying fuzzy pattern recognition. Through actual validation, the reliability of the prediction is tested and verified.
Experimental Study on Creep Characteristics of Coal under Uniaxial Compression
Authors: Yang Yong Jie , Guo Ming Fu , Chen Dong Wei
Published: November 2012

Generally surrounding rocks of deep mine show the typical creep characteristics and the multi stage loading creep test of coal was carried out by MTS815 rock mechanical test system in this paper. Compared to the creep coefficient of other rocks, creep coefficient of coal is relatively small. Coal creep failure changes obviously when load level is higher than the threshold stress. The constitutive characteristics of creep failure of coal can be fitted preferably by the Cubic Polynomial.
Numerical Study of the Rock Fragmentation by Three TBM Cutters
Authors: Wang Yan , Liang Zheng Zhao
Published: November 2012

Based on the mesoscopic damage theory and the finite element method, a numerical code RFPA was applied to investigate the rock fragmentation by three TBM cutters loaded one after another in different time interval. The whole process of crack initiation and propagation was successfully simulated by the cutters loaded with different step intervals. The time interval of the disc cutters has significant influence on the fracture patterns and the rock breaking efficiency. The simulated results show that there are three types of breakage mode of the rock subjected to compression by the cutters.
A Quality Cost Evaluation Model of Construction Enterprises Based on Unascertained Method
Authors: Gao Chun Yan , Niu Jian Guang , Xing Xiu Qing
Published: November 2012

In view of the study on the quality cost prediction of construction enterprises, this paper established a relatively good index system of quality cost projections. The quality cost of construction enterprise is evaluated by introducing a new mathematical model —Uncertaintymethod. As a new Uncertainty information processing method, Unascertained overcomes the shortcomings of fuzzy evaluation method does not meet the measurement criteria.
The Research of Enterprise Work Safety early Warning Index Based on Risk Management
Authors: Hou Qian , Wu Zong Zhi
Published: November 2012

The purpose of this thesis is to solve the issue that the development of the work safety usually falls behind of the development of the production, which is driven by methodology that evaluating the effectiveness of the safety management by ranking the accidents.The research provided a production accident early warning index to reflect the real time safety status in order to prevent the accident at the source, to control the process and to measure the performance. A correlation analysis was then conducted parameters that meet the requirement of confidence intervals were given. A forecasting method using both quantitative and qualitative tools was proposed and the weights of each early warning index and the correlation between the indexes were determined. Finally, a mathematical model of production accident early warning was established to generate the production accident risk index which could represent the status of work safety and its future trends to forecast and prevent the severe accidents.
Deformation Prediction of Slopes Based on Grey Verhulst Model
Authors: Qiang Zhou
Published: November 2012

The grey Verhulst nonlinear differential dynamic prediction model is applied to the prediction of the development of rock slope deformation in this paper. And experimental results show that grey Verhulst model is feasible to predict the slope rock mass deformation.
Study on the Prediction Method for Brittle Failure of Hard Rock Based on Acoustic Emission Test
Authors: Xu S C. , Chen B R. , Jin C Y.
Published: November 2012

In this paper, a series of true triaxial tests indoor with acoustic emission mornitoring were conducted and the characteristics of acoustic emission rate and energy releasing rate in the section adjacent to failure were gained. According to the different characteristics of acoustic emission rate, we divided the events rate into three types which were main shock, foreshock-main shock and cluster shocks. And then, a prediction method for hard rock was put forward according to different events rate types based on the trends of AE signals in the section adjacent to failure for hard rock.
Analysis on Stability of Powerhouse Slope under the Operation Water Level Condition of Tianhuaban Hydropower Station
Authors: Tang Yan Chun
Published: November 2012

Through numerical calculation on the stability of powerhouse slope by the coupling fluid-solid model of ABAQUS software, stability of powerhouse slope under the operation water level of Tianhuaban hydropower station has been evaluated. The results show that influence of pore pressure and the pore fluid effective velocity vector under the operation water level of Tianhuaban hydropower station has been limited on the scope of powerhouse slope from elevation 971m to 990m; the displacement concentration phenomenon has been existed on the scope of powerhouse slope from elevation 971m to 1010m, but the value of total displacement is smaller; influence on the stability of powerhouse slope under the operation water level is weaker; and on the scope of powerhouse slope from elevation 971m to 990m, the seepage phenomenon may be happened, and the waterproofing measures on this area must be strengthened. The achieved results can provide a research foundation for the stability of hydropower station slope on the periodic pore pressure disturbance.
Moisture Migration Mechanism in Granite Residual Soil Embankment under the Combined Action of Rainfall and Capillary
Authors: Que Yun , Yao Xiao Qin
Published: November 2012

Taking the granite residual soil embankment of Fujian Province as an example, this paper investigated the moisture migration mechanism in granite residual soil embankment based on the finite difference technology. The results show that the moisture migration of the shallow layer of the embankment displays up first and down later in dry seasons. In rainy seasons, the negative pressure head of the embankment’s upper soil increases, and range of rainfall variation of the initial period is much sharper than the later period. Meanwhile, at the toe of slope, the rain firstly supplies the groundwater, making it a weak location. After the rain, the contour line of negative pressure head in the upper embankment gradually becomes sparse, and the gradient gradually decreases in the embankment. The fluctuation of negative pressure head on foundation surface decreases with the depth of groundwater. As to the low embankment, the change of the embankment moisture mainly depends on the external weather conditions when the groundwater level is deep and the moisture is mainly affected by groundwater when the groundwater level is shallow.
Rapid Improvement Technique of Shallow Base in Super-Soft Foundation
Authors: Chen Ping Shan
Published: November 2012

Dredged soil once was considered as the waste and abandoned, which had resulted in serious environment pollution and high costs. Since the viewpoint of “Utilize Dredged Soil Valuably” was proposed in 1980s, the dredged soil has been used as the hydraulic fills in land reclamation, which can meet the requirements of the booming land expansion. However, most of the fresh hydraulic soil is the floating or fluid mud, and has high water content but little bearing capacity, so it is difficult for the traditional treatment methods to improve the super-soft foundation. Based on the drainage and consolidation theory, the rapid improvement technique without sand cushion for the shallow base was developed and has been applied successfully in engineering practices. The applications showed that the rapid improvement technique improved the bearing capacity of super-soft foundation substantially, and compared with the traditional vacuum preloading method, this new technique is more environment-friendly and cost-saving.
Studies of Hard Interlayer’s Influence on the Creep Deformation of Salt Rock Cavity
Authors: Huang Xiao Lan , Yu Chao
Published: November 2012

The existence of interlayers has great influence on the stability of salt cavern. Based on the research results of creep test and other mechanical properties of salt rock and interlayer in Yunying Salt Mine, Hubei Province, cylindrical singular calculation model of salt rock cavity is built, and the corresponding simulation is conducted. Hard interlayer’s constraint influence on the creep contraction deformation of salt cavity is demonstrated. In addition, how the number of interlayers affects cavity radial deformation is discussed too. The results are important to oil-gas storage cavern modeling analysis in laminated salt rock.
Study on Test Cycle of Build-up Well Test in Low Permeability Reservoir
Authors: Liu Tong Jing , Jiang Bao Yi , Liu Rui , Diwu Peng Xiang
Published: November 2012

The speed of development of well test technology has been faster than well test interpretation technology in low permeability reservoirs. One of the main research directions for well test soft technology was specific interpretation theory and interpretation techniques. In recent years, well test was put forward higher request by the production complex and low permeability reservoirs. Test interpretation results urgently need to be applied to reservoir engineering analysis in-depth and quantitatively. One of the limited reality conditions of well test application was lack of the comprehensive research combined with the reservoir engineering. Combining with the test examples, the investigation radius change between injection-production wells was studied, and the build-up well test cycle in low permeability reservoir was optimized. According to the actual process situation, it was proposed that take 20d as the upper limit of well test cycle, and 10d block as the lower limit of well test cycle of build-up well test in a typical low permeability reservoir.
Analysis on Deformation Failure Mechanism of Woshaxi Landslide in the Three Gorges Reservoir Area
Authors: Lu Shu Qiang , Yi Qing Lin , Yi Wu
Published: November 2012

The Woshaxi landslide is located on the right bank of Qinggan river which is a tributary of the Yangtze River, which continuously and seriously developed after the impoundment of Three Gorges. Surface investigation showed that there were shearing, tensing and crush-pressing fissures. The monitoring data showed that displacement of lower part was bigger than that of upper, and the sliding because of the reservoir water level decline. The landslide mechanism was towing forward and pushing backward, and towing happened mainly in the prophase, while pushing happened mainly in the anaphase. Heavy rainfall and water level drawdown are the main factors of landslide deformation.
Experiment Study of the Soft Rock Materials Based on Rotary Penetration Test
Authors: Li Qian , Li Ning
Published: November 2012

Based on the new-style rotary penetration instrument, the rotating-incising-drilling experiment for the hard rock material are tested in this paper. The conclusion is that rotary penetration test can more effectively improve the drilling capacity than cone penetration test using in hard layer such as soft rock、hard loess and so on, and reduce bit pressure without improving the capability of instruments based on the factor that using rotary drilling instead of direct drilling. Further analyses have shown that the qualitative relationships between rotary penetration test data and basic mechanical parameters can be preliminarily obtained.The results establish a foundation for further study of rotary penetration technique using in hard layer.
Numerical Simulation of Stress Wave Propagation in Coal-Rock Combination Media
Authors: Xue Dong Jie , Zhou Hong Wei , Liu Jia Dun , Yi Hai Yang
Published: November 2012

By establishing numerical simulation model of SPBH and comparing dynamic response of four kinds of coal-rock combination media subjected to three different stress waves, changes law of the reflected wave, incident wave, strain and strain rate were obtained. The results show that rock-rock combination has almost the same rules of reflected waves as rock-coal combination, coal-coal combination and coal-rock combination, while the coal-coal combination has the largest peak of reflected wave, followed by the coal-rock combination and the rock-coal combination, and the rock-rock combination ranks last. With increasing incident wave peak, the coal-rock combination weakens the peak more apparently. Strain softening occurs in coal samples under stress wave of peak value with the law that strain rate firstly increases, and then maintains a constant value, continues to increase and then decreases, increases reversely and then decreases. Constant strain rate of the phenomenon over time occurs. The results provide guidelines for both the study on propagation mode of stress wave in coal and rock combination media and the prevention of mining-induced dynamic disasters.
A Multivariable Grey Model and its Application to Subgrade Settlement Prediction
Authors: Liu Han Bing , Xiang Yi Ming , Wang Han Zhang
Published: November 2012

Subgrade settlement is a complex systematic process. Frequently used single point forecasting models can’t consider the correlation of settlement between the discrete monitoring points, so that it can’t represent the integrated deformation regularity of subgrade. For resolving this problem, this paper extends the single point GM(1,1) model into a multivariable grey model (MGM(1,n)), and completes the programming with MATLAB. Finally, A MGM(1,3) model is established to predict the subgrade settlement, and the result of the model is more precise and effective than the single point GM(1,1) model through a practical application.
Study on Three-Dimensional Fracture Persistence of a Jointed Rock Mass in a Dam Site in China
Authors: Wang Xiao Ming , Xia Lu , Yu Qing Chun
Published: November 2012

Fracture persistence is an essential parameter to evaluate the stability of rock mass. In the present paper，a projection method based on fracture network modeling was employed to study the three-dimension(3D) fracture persistence of abutment rock mass in Wudongde dam site. Fracture data from an exploration tunnel was used to generate a fracture network model. Subsequently in the fracture network, numbers of projection planes with different positions and different attitudes were set. A computer program was written to calculate 3D fracture persistence. The scale effect on persistence is discussed. The distribution characteristic of persistence values was analyzed. Also the change of lateral persistence with directions was studied. The following conclusions were drawn from the study：(1)The horizontal persistence values do not have a noticeable scale effect, while the effect of size on the lateral persistence is significant;(2)The lateral persistence values conform to a normal distribution with a mean value of 3.9;(3)The persistence value varies with the direction of projection plane. The steep dip angle corresponds to a low persistence value. A maximum value is obtained when the trend and dip angle of the projection plane are 175°and 65°.
Research on the Axial Load Transmission Function of Cast-in-Place Pile in Xigeda Rock Stratum
Authors: Sun Zhi Feng , Qu Hong Lue , Wu Xing Xu
Published: November 2012

Load transmission characteristics and rules of pile foundation’s soil-pile system have become one of the basic research contents for pile foundation researchers. Given the different geological and constructive conditions, the load-bearing features of pile foundations in different places have their own rules. Hence, research on the features of load transmission in different places has turned out to be an important project facing all the pile foundation researchers. The Xigeda-rock group is widely spread in Xichang-Panzhihua area in Sichuan Province. This rock stratum is a kind of extremely soft rock, with the nature of argillization, softening, hydrating and cracking with water. According to the static load test data from the pile test in Xinjiu of Panzhihua, this thesis obtained the load-settlement curve with displacement coordinate transformation method. And it is then compared with the actually measured load-settlement curve. Ultimately, the model and value range for parameters of axial load transmission function for cast-in-place pile in Xigeda-rock stratum is proposed.
Research and Exploration on Combined Support Technology in Deep Soft-Rock Roadway
Authors: Ren Lian Wei , Wang Guang Yong , Wang Long
Published: November 2012

Because of the existence of high stress in the surrounding rock of deep roadway, the physical and mechanical properties of the surrounding rock to change, and the surrounding rock stress distribution is very different from the shallow, so the way of shallow roadway support is not suitable for deep roadway. Deep soft-rock roadway support is a complex systems engineering, it should consider the different geological conditions, roadway scope of application, construction technology conditions, construction period and the cost and other factors to determine the optimal combined support program, if the special geological conditions encountered in the construction, it should be timely to improve the supporting program to meet the construction safety and ensure the quality. This paper is based on the characteristics of deep roadway support, sums up the combined support form in the project, researches and analyzes the combined support technology, and explores how to use suitable combined support form in deep roadway.
On the Calculation Method of Bearing Capacity of Combined-Pile Composite Foundation
Authors: Zhu Chang Zhi
Published: November 2012

Based on study on the existing calculation method of bearing capacity of combined-pile composite foundation，consider the behavior of loaded combined-pile composite foundation and the general influence of construction method to the bearing capacity of soil, two coefficients, soil bearing capacity exertion coefficient and soil bearing capacity improvement coefficient, are introduced，a new step-by-step calculation method of bearing capacity of combined -pile composite foundation is put forward.It shows that computed data is in agreement with experimental date of loading test by example project．
A Road Slope Stability Analysis
Authors: Yu Anji , Liu Jie , Yang Dong Dong , Cao Hua Feng , Yang Xiao Pei
Published: November 2012

In view of highway slope stability problems, this paper puts forward the method that numerical modeling of the road slope by the finite element analysis software —ADINA, with the Gravity Loading Proportion Methodto calculate the slope stability coefficient, deeply research the development process of deformation, breakage characteristics and stability of road high cutting slope. Comparison with the results obtained by the strength reduction FEM proposed by AcademicianYingrenZhengshows that the proposed method is more simple and reasonable to determine slope stability or not.
Research on the Equivalent Mechanical Parameters for the Honeycomb Core Based on the Y Element
Authors: Deng Zong Bai , Zhao Jin Sen , Jiang Lan
Published: November 2012

There are several models proposed by researchers that try to explain the equivalent mechanical parameters Ex, Ey, Gxy for the honeycomb core, but every method has different assumptions about deformation in equivalent mechanical parameters, they are not built on the same model and have some problems. This paper presented a new equivalent Y model firstly which considers the axial deformation and obtained the conclusion that regular hexagon honeycomb core has the properties of isotropy. This research successfully resolves the problems which existed in other models. It is giving the theoretical base for the analysis of the honeycomb structure.
Study on Comprehensive Performance of the New-Type Steel-Encased Concrete Composite Beams Using FEM
Authors: Jiang Ji Tong , Zhu Xiu Lan , Du De Run , Dong Kun , Yang Song
Published: November 2012

The U-section steel-encased concrete composite beams, a new type of composite beams with reasonable and efficient form, are developed from the common steel-concrete composite beams. In this paper, the U-section steel-encased concrete composite beams and common H-section steel composite beams were modelled numerically and analyzed contrastively from the same section height and reasonable cross-section two aspects using the finite element method (FEM) and the better mechanical behavior and economic performance of the new-type steel-encased concrete composite beams are summed up.
The Applied Research of Steel-Timber Combined Member to Steel Structure Residence
Authors: Pan Fu Ting , Wu Tao , Zhang Li
Published: November 2012

The steel industry has developed rapidly in recent years. At the same time,steel structure residence also rises gradually.Buckling is the main disadvantage of steel structures,so the strength of steel can't be fully utilized. Steel-timber combined member has both excellent mechanical properties and nice decoration effect, and can be well applied in steel residential building.
Analysis on Dynamic Failure of Steel Double-Layer Spherical Latticed Shell under Strong Earthquake
Authors: Li Yang , Li Hai Wang , Liu Jing
Published: November 2012

In this paper, the analysis on dynamic failure behaviors of steel double-layer landing spherical latticed shell used in a gymnasium with the function of earthquake victim shelter is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is sufficient and 38.4% of the rods enter into their plastic stage; The ratio of its maximal failure node vertical displacement and its plane diameter is 1/139; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 2090gal, which is 5 times more than the official seismic fortification level of 8 degree (major earthquake, 0.2g) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 8.64,which shows the structure owns good energy dissipation capacity.
Timing Analysis on Rock-Bolted Crane Beam of the Underground Power House of Jinping II Hydropower Station
Authors: Li Jie , Xu Su Chao , Jin Chang Yu
Published: November 2012

According to design requirements, to reduce the construction difficulty for crane beam on rock wall in underground main power house of JinpingII hydropower, and to condense construction time limit for a main building, theconcreting time for crane beam on rock wall is needed to be specially analyzed. As the property of JinpingII hydropower station is under high field stress, numeric analysis uses rock mass deterioration constitutive model RDM. Considering the special mechanics behavior between concrete and rock wall, softening element and interface element are used respectively to make the simulation. By analyzing the stress for different placement times of crane beam of main house, it is shown that placement timing has certain extent effect on upper stress of crane beam. As a result, in order to assure stability of constructing and operating periods of crane beam, the calculation and analysis suggest that the concreting should be after the third excavation, but certain structural joint need to be installed.
Application Research on Concrete Filled Steel Tube Supports Supporting Technology in Stress Concentration Roadway
Authors: Liu Guo Lei , Wang Jun , Wang Hai Bin , He Xiao Sheng , Li Xue Bin
Published: November 2012

Part of the east wing belt roadway in -450 level east, NO.1 mining area, Dashu village coal mine, Jizhong Energy Fengfeng Group was under the 172102 working face’s stop mining coal pillar. The phenomenon of the stress concentration was obvious, the pressure of the roadway was large and the surrounding rock damaged severely. Concrete filled steel tube supports were used in stress concentration region. The supports type was φ194×8mm, and distance between supports was 800mm. They were of rapid construction speed, better supporting effect. The numerical simulation results also showed that the concrete filled steel tube supports can reduce deformation of the roadway surrounding rock in stress concentration region effectively.
Influence of Underground Mining on Failure Mode and Stability of Counter-Tilt Slope in Surface Mines
Authors: Wang Dong , Cao Lan Zhu , Piao Chun De , Bai Run Cai
Published: November 2012

How to demonstrate the deformation and failure mode of the slope under combine surface and underground mining and evaluate its stability scientifically is one of the problems that need urgent solutions in mining engineering. First, the deformation and failure mode of the slope under simple surface mining, the deformation and failure mechanism of the overlying strata affected by underground mining and deformation mechanism of the slope under combined surface and underground mining were analyzed, then the failure mode and the stability calculation method of the slope under combined surface and underground mining was studied. The results show that the failure modes of the slope under combined surface and underground mining involve three patterns: slipping failure, subsiding failure and slipping-subsiding combined failure, that the failure modes and the stability of the slope under combined surface and underground mining be significantly affected by the underground mining positions and the influence be mainly controlled by the length of the latent slide plane of the slope and the weakening degree of the rock masses in the subsidence range. Finally, a limit equilibrium method to calculate the slope stability under combined surface and underground mining was put forward.
The Nature Frequency of Point-Fixed Glass Facades and the Influencing Factors Study
Authors: He Fei , Huang Cheng Wei , Huo Zhi Peng
Published: November 2012

The resonance phenomenon may occurs when the frequency of the external load which is carried on the structure similar to the structure nature frequency. The structure is unsafe.The displacement and internal forces of structure can reach the maximum. This paper take modal analysis for point-fixed glass facades,get the natural frequencies and modes,calculate various parameters effecting structural frequencies and the variational rules of those frequencies by changing those various parameters.
Queries for the Calculations of the Shear Wall Stability
Authors: Tong Xiao Long , Chen Fang
Published: November 2012

The relevant specifications in China make the relevant regulations to guarantee the stability of the shear wall and provide the check formula. This paper discusses the rationality of the calculations on the shear wall stability from the perspective of the reliability index, and calculates the reliability index in the state of the shear wall’s instability limit by means of JC method, the result shows: the current regulations can not guarantee the requirement that the reliability index of the shear wall is not less than the target reliability index. Based on the target reliability index, load partial coefficient and load, geometric dimension probability statistical parameter, this paper uses JC method to make inverse operation, calculates the shear wall stable resistance force partial coefficient under four types of load effect combinations, and analyzes the influence of load effect ratio, thus getting the shear wall stable utmost limit load best resistance partial coefficient.
Design Study of Steel Structure Fire-Retardant Coatings under High Temperature (Fire) Conditions
Authors: Ou Man Li , Cao Wei Jun , Jiang Long Min , Cao Hui
Published: November 2012

As the result of great changes occurring to mechanical properties under high temperature (fire) conditions, steel structures will soon lose the strength and stiffness and lead to structural damage. Through analysis of the steel structure fire resistance design methods under the conditions of high temperature (fire), this article explores the most used fire protection methods in steel structures—brushing or painting fire-resistant coatings, studies the fire-resistance theory of steel structure under fire conditions; in addition, the author proposes the reasonable thickness of the steel structure fire retardant coating of fire-resistant design through design examples.
Strength Analysis of Vessel Based on the Fluid Structure Interaction Method
Authors: Liu Chao , Li Fan Chun , Yun Yajie
Published: November 2012

Building a whole vessel model ,and make use of FLUENT to calculate the resistance and surface pressure of the vessel in a certain speed . Compile a user-defined function, in which the numerical wave channel has been developed, thus the surface pressure was calculated in two kinds of special conditions, hogging and sagging, and then by using of the Fluid-solid coupling method, the surface pressure was exported to ANSYS.The method uses a same hull model in the flow field and the structure calculation process, avoiding the loss and distortion of information in the previous model transformation , and the calculated results can analyze more accurately the stress and deformation of the hull. The results for performance assessment of the vessel are effective and the calculation method can be a reference in the structure optimization design of vessels.
3-Dimensional Stress Analysis and Safety Assessment of the Underground Draft Tube
Authors: Liu Xian Shan , Song Bi Hong
Published: November 2012

It is well known that research on mechanical characteristics of the underground draft tube and corresponding stress distribution of the steel lining under complex conditions plays an important role on assessing the underground powerhouse and hydropower project safety. However, due to complex boundaries and load conditions of the draft tube, especially the concrete itself is so easy to crack, crush and become plastic that it is more difficult to determine its 3-Dimensional mechanical behavior of the underground draft tube. To better solve the above difficulties, 3-D FEM simulated model was built based on the universal software named Ansys to analyze the stress distribution of the draft tube structure and the steel lining. The calculation results showed that the hoop stress and radial stress of the tube were all satisfied with the standard requirement, and maximum stress of the steel lining also accorded with the strength requirement, which indicated that simulation model and the analysis method brought forward in the paper was applicable and practical, and also provided an effectie method for the underground structures design and steel arrangement of the draft tube.
Study on Type Design of Multi-Circuit Transmission Line Tower
Authors: Wang Yan Hai , Meng Sui Min , Tang Bo
Published: November 2012

In China as the overhead transmission line corridor is less and less, multi-circuit transmission line tower application would become more common. In this paper the multi-circuit tower type design problem was analyzed and discussed, and put forward some ideas on how to solve these problems. To 330kV four-circuit tower type design as an example, the design steps, methods were described in detail, and gave three kinds of design schemes, finally, three kinds of tower characteristics are analyzed to draw valuable conclusions.
Analysis of Prestressing Loss on Construction of External Prestressed Wooden Buildings
Authors: Zhang Ji Mei , Pan Jing Long , Dong Hong Bo
Published: November 2012

Wooden buildings which has a long history, is one of the earliest forms of building structures by mankind.The structure form and construction method of are different from the common prestressed structure,therefore,the prestressing loss caused by the external prestressed structures is different from that of the common prestressed structure.It is an effective method to reduce the large deflection of large-span wooden structure by external prestress method.Through the real model test of the external prestress tension at scale of 1:2,and after long-term observing on parabolic wooden beam of external prestress with initial pretension force,we can quantitatively analyse the effections of prestressing loss of prestressed rebar due to the creep of wood.At the same time,this paper gives the deflection calculation formula during the term of test.The conclusion obtained is useful to designers.
Study on Mechanical Behavior Influence of the Hollow Ratio to the Cast-In Situ Concrete Hollow Slab with Two-Way Tube Fillers
Authors: Jiang Zi Yue , Luo Zhao Hui
Published: November 2012

This paper discribes the problem of cast-in-situ concrete hollow slab with tube fillers allocated by single-way, according to the arrangement principle of tube fillers in the cast-in-situ concrete two-way hollow slab with two-way fillers, using nonlinear finite element analysis method, through the research on mechanical behavior influence of the hollow ratio to hollow slab, and gives the corresponding design recommendations. Lastly, this paper summarizes the layout method of tube fillers and reasonable requst of the hollow ratio for guiding design.
Experiment Study on Interfacial Normal Bond Strength of Concrete Filled Steel Tube
Authors: Liu Zhen Yu
Published: November 2012

To study the debonding of concrete filled steel tube (CFST), pulling and bending methods were used to test the normal bond strength. Based on the test result, debonding due to temperature change and shrinkage of core concrete in CFST was analyzed. The test and analysis result shows that the bending method is a better test method; the concrete strength has little influence on bond strength while the surface condition of steel has much influence on it. The bond strength of steel which is rust is greater than that of the steel with smooth surface. According to the analysis on the bending test result, the normal bond strength of 0.86MPa was got and the debonding of CFST arch was analyzed, the analysis result shows that debonding will easily happen under the action of temperature change and shrinkage of core concrete. The test methods and results can provide a reference for engineering applications.
Equilibrium Paths of a Fractional Order Viscoelastic Two-Member Truss
Authors: Tang Ming Qiao , Li Yuan Ping
Published: November 2012

The fractional dynamics equation of a viscoelastic two-member truss system, in which fractional derivative model introduced to simulate the materials’ characteristics, is proposed. The equilibrium paths under vertical loads, horizontal loads and combined loads are discussed respectively. The results show that: there are primary and secondary equilibrium paths under vertical and horizontal loads. Bifurcations will occur under combined loads and the ultimate bearing capacity of the system will reduce. The equilibrium paths became complex because of the horizontal disturbance, and the bigger of the horizontal disturbance the smaller of the system ultimate bearing capacity.
Study on Capacity of High-Strength Angle Struts Connected by Single Limb
Authors: Fan Chun Lei , Hao Ji Ping , Tian Wei Feng
Published: November 2012

Experiment on bearing capacity of 24 Q460 high strength angle steel for compression members attached by one leg shows: the ultimate bearing capacity of the experiment value are higher than the calculated of the “Design of Latticed Steel Transmission Structures” (ASCE10-1997), on the same section in different slenderness ratio of components, the larger slenderness ratio, the higher the ratio; while on the same slenderness ratio in different sections, the greater width-thickness radio, the greater the ratio. Based on this problem, analyzing the current standard, a set of formulas based on high-strength angle struts connected by single Limb was brought, which can used for the design of the Q460 high-strength angle.
Research of Green Reconstruction of Hangzhou Arts & Crafts Museum
Authors: Wei Tong Hua , Tang Shi , Zhu Wei
Published: November 2012

Based on the characteristics of the deserted plants of refining and looming workshops in Hangzhou Honglei Silk Mill, the green low-carbon reconstruction targeting industrial remains along The Grand Canal is carried out from five aspects including land saving, water saving, energy saving, material saving and interior environmental quality control, under the guidance of the technical strategy called Evaluation Standard for Green Buildings. With the help of the integration of several appropriate technologies, the goal of the green reconstruction is accomplished, with no increasing costs.
The Evaluation of Intercity Railway Train Operation Plan Based on Multi Index Cosine Decision
Authors: Qu Si Yuan , Xu Xing Fang
Published: November 2012

The evaluation of train operation plan is the important means of optimizing train operation plan. It is also a complex multi index comprehensive evaluation problem. Based on comparison of angle cosine value between line segment in each scheme and ideal line segment in ideal scheme, cosine decisions get the optimal decision scheme. Through the main factor analysis of intercity railway train plan and by combining the entropy weight coefficient method and using the cosine decision method the evaluation of index system of intercity railway train plan is established. Taking the Shanghai-Nanjing intercity railway for example, the results shows that cosine decision is adapt to the actual operation with simple calculation process, easy to use. The evaluation model should provide new ideas and methods for the optimization the train operation plan so as to provide technical support for intercity railway operation.
Basic Satisfaction Survey on External Environment of South Huangxing Road Pedestrian Street in Changsha
Authors: Yuan Min , Miao Bai An
Published: November 2012

Through analysis of users’ characteristics of South Huangxing Road Pedestrian Street in Changsha, and the investigation of satisfaction degree and psychological demands for external environment, the research tried to find out the best program for the external environment of city pedestrian street. Questionnaires and on-site interviews included gender, age, academic qualification, occupation, place of residence, the frequency and purpose of pedestrian street visiting. The external environment of the pedestrian street was analyzed in the prospects of environmental behavior and environmental psychology. Through the assessment of the users' satisfaction and behavior characteristics, it is observed that people have a great demand for rest seats and toilet facilities, and that most people prefer more leisure and cultural facilities but pay no attention to the morphology and interface of the structure. The paper originally established an external environmental evaluation criteria and a scoring system of respondents for commercial pedestrian street.
Applications of Visual Characteristics in Highway Alignment Landscape Design
Authors: Hu Sheng Neng , Fan Qin Dong , Hu Zhong Huang , Xiao Xin Hua
Published: November 2012

Highway alignment landscape is the important components in landscape design, study visual characteristics in high-speed operation conditions, analyze the request to road geometry design under dynamic vision, put forward highway alignment landscape design method.
Research on Ecological Rehabilitation and Landscape Planning of Wetland Resort
Authors: Wu Tao , Ding Ji Jiang
Published: November 2012

Abstract. Rapid urbanization and population pressure have course the problem of wetland environmental degradation and damage, but the development of eco-tourism on the premise of protection of bio-diversity is an ideal model of achieving coordination between environmental protection and socio-economic development. This paper take Ecological Water Resort of Hongze Lake national nature reserve, Sihong, Jiangsu for example to research the technique of ecological rehabilitation and landscape planning of wetland resort. The key problem of ecological rehabilitation is rebuilding and restoring the structure of wetland, repairing wetland vegetation, controlling sewage disposal, providing suitable site for birds to forage and free from interference of the visitors. Landscape planning of wetland resort should embody local customs and characteristics, at the same time, priority should be protecting with moderate development and reducing interference to a minimum extent, and establishing an effective tourism infrastructure.
Design of Decorative Glass Handicraft Products in Qinhuangdao
Authors: Yang Xu Guang , Zhou Bin
Published: November 2012

The development of domestic and foreign decorative glass handicraft products is introduced, and the processing of glass handicrafts is described in this paper. It is an imperative to design with local characteristics glass handicrafts and make full use of local resources in Qinhuangdao so as to promote the local economic development.
Research on the Renewable Energy Hot Water System in the Subtropical Region and Comparison of their Effectiveness and Benefits in Northern Guangxi: Take Solar Integrated System Design of Higher Institutions’ Dormitories as an Example
Authors: Wang Li , Zhu Qi Sheng , Zhou Yan Liu
Published: November 2012

This paper is based on the general condition that renewable energy resources used in buildings in Guangxi subtropical regions. By integrating the case of 9# dormitory building in Bowen College, Guilin University of Technology, making compare and contrast to the effectiveness of using ground source heat pump system, air source heat pump system , solar electric water heaters under such condition, taking the effectiveness of using renewable energy resources in air source heat pump system, the author discuss the issue of renewable energy resources system and the integration of buildings and provides some suggestions.
Possibilities of Alpha Gypsum Preparation in Chloride Salt Solutions
Authors: Dvořák Karel , Fridrichová Marcela , Gazdič Dominik
Published: November 2012

The necessity of continuously saving of natural resources and the continuously increasing utilization of waste materials, which results in by product of the primary production, is in the interest of sustainable life on the Earth. These valuable secondary raw materials are stored as waste and urge for use as inexpensive and easily available material. The Institute of Building Materials and Elements Technology at the Brno University of Technology, solves in the long term the problem of alpha gypsum preparation by dehydrating the gypsum in the solution of chloride salts. The gypsum dehydrates to alpha-hemi-hydrate by this method under atmospheric pressure in liquid environment. The tests were brought as far as to the stage of laboratory production. The chloride ions are after dehydration washed out and afterwards the gypsum is dried.