bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation of Cantilever Erection Procedure of Lattice Shell Structures
Authors: Xu Shuai , Yin Yue , Chen Zhi Hua
Published: September 2011

This paper presented the construction technique of a double-layer spherical lattice shell with a diameter of 66m, while the small-unit cantilever erection method is adopted. The variations of internal forces during the different erection simulation procedures are also indicated. Meanwhile some suggestions are proposed to actual construction.
Analysis on the Characteristics of Pile Skin Friction under the Displacement Interactions between Pile and Soil around
Authors: Lin Pei Yuan , Tang Lian Sheng , Ding Qing Feng
Published: September 2011

On the basis of analyzing the occurring mechanism of pile skin friction, pile-soil relative displacement difference function is introduced, and the differential equation which depicts the relationship between pile skin friction and depth is derived, then the calculating model of pile skin friction with depth is established under considering the displacement-interaction process. Field monitoring data are employed to verify the rationality and validity of the model proposed. Through the established model, influences, exerted by pile-soil relative displacement difference, on the pile skin friction distribution are discussed and divided into three stages: I. stage of linear increase; II. stage of nonlinear increase; III. stage of convergence. Filed testing data comparing and theoretical analysis results indicate that the method proposed can describe the transferring process as well as the distribution law of pile skin friction under taking the pile-soil interaction into account, the parameters related and needed can be easily obtained, and the model suggested in this paper is of value in pile theory and engineering.
Effects of Excavation on Deformation and Failure of Anti-Dip Slopes under the Action of Seismic Load
Authors: Kong Ji Ming , Fayou A. , Ni Zhen Qiang , Cui Yun
Published: September 2011

Wenchuan earthquak induced a large number of mountain hazards. Through the survey found that manual excavation slopes tend to become concentrated area of mountain disaster, it’s indicate that the effect of excavation damage on the slope deformation and failure under seismic load is very obvious. Anti-dumping slope deformation as one types of mountain hazards induced by Wenchuan earthquake, and it’s also seriously affected by excavation damage. In this paper, as Wang Jiaping landslide for example, using the finite element method to simulate the landslide and analysis the deformation and failure of slope affected by the excavation damage. Analysis shows that deformation and failure of slope is significantly induced by excavation, and resulting in displacement, stress and the between layer sliding distance increased，the between layer friction stress reduced. The results agreement with the characteristics of the anti-dumping slope deformation and failure induced by Wenchuan earthquake mainly concentrated in excavation slopes.
Deformation study of Lining on Overlap Tunnels Based on Elastic Foundation Beam
Authors: Dai Chun Quan , Wang Lei , Wang Yong Ji
Published: September 2011

Tunnels of new across the old one with short distance is the emphasis and difficulty in metro engineering development, which has great research values. According to the characteristic of deformation on overlap tunnels with short distance, we put forward the calculating model of lining deformation and internal force analysis. And deduced the formula of calculation on the new tunnel's construction to adjacent ones, then discussed and analyzed the settlement of the point of inflection on soffit lining and the greatest subsidence angle. We verify the theoretical formula about the reliability of the computation and rationality through a series of numerical simulation test against the background of Qingdao overlap tunnels.
On the Portal Construction Technology of Spiral Tunnel in Special Stratum
Authors: Chen Bo , Ren Hui , Fu Li Xin
Published: September 2011

Abstract: Xigeda stratum is a kind of extremely soft rock with bad engineering property and its rock easily gets soft when wet which gives rise to geologic hazard, thus side and heading slope excavation at tunnel opening often causes collapses. Based on the construction technology of Gan Haizi tunnel in Yaxi express way, this thesis will first analyze its strata characteristics, and then focus on the methods of stabilizing side and heading slope, as well as the effective means to avoid opening deformation, so that the construction and operation can be carried out safely.
Elasto-Plastic Analysis of Seismic Response of Valve-Hall Structure with Suspension Valves of Large-Scale Converter Station
Authors: Wu Yi , Yang Chun , Cai Jian , Pan Jian Ming
Published: September 2011

Elasto-plastic analysis of seismic responses of valve hall structures were carried out by using finite element software, and the effect of seismic waves on the seismic responses of the valve hall structures and suspension equipments were studied. Results show that significant torsional responses of the structure can be found under longitudinal and 3D earthquake actions. Under 3D earthquake actions, the seismic responses of the suspension valves are much more significant than those under 1D earthquake actions, the maximum tensile force of the suspenders is about twice of that under 1D action. The seismic responses of the suspension valves under vertical earthquake actions are much stronger than those under horizontal earthquake actions, when suffering strong earthquake actions; the maximum vertical acceleration of the suspension valves is about 4 times of that under horizontal earthquake actions. It is recommended that the effects of 3D earthquake actions on the structure should be considered in seismic response analysis of the valve hall structure.
Behaviors of Polyurethane Filled Double Skin Steel Tubular Members
Authors: Hang Zhen Yuan , Mi Xu Feng
Published: September 2011

Based on the nonlinear finite element software, the mechanical properties of polyurethane filled double skin steel tubular (PFDSST) members with different hoop coefficients and slenderness ratios under axial compression have been studied by nonlinear finite element software. On the basis of the researches on the numerical simulation results, it was summarized that the influences on stability, ductility and properties of the PFDSST members under axial compression, and then the work processes of the PFDSST members have been revealed deeply, the theoretical basis for the designs of the PFDSST members was established.
3D Reconstruction and Digital Preservation of Ancient Building Based on 3DGIS
Authors: Wang Jing Wei , Jiang Yan , Ma Dong Ling
Published: September 2011

In this paper, the work of data acquisition is devided into the horizontal distance and height measurement according to the features of 3D data obtained from ancient building. The non-prism total station is used to achieve the non-damage and non-contact data acquisition from the ancient building. Moreover, the method of 3D reconstruction and digital preservation of ancient building is introduced based on 3DGIS, which has practical value based on its efficiency and reliable accuracy.
The one-Dimensional Unsteady Flow Prediction Method for Pressure Waves in High-Speed Subway and its Applications
Authors: Zhou Chao Hui , Mei Yuan Gui
Published: September 2011

With the speed-up of subway, the discomfort problem of passengers caused by pressure waves becomes more and more serious. The prediction method of the pressure waves based on the one-dimensional unsteady compressible non-homentropic flow model and the method of characteristics is introduced, and the program is developed which can be used to calculate the pressure waves not only produced by single train passing through subway tunnel with airshafts, but also produced when the train starts or stops. On this base, the influence of the train speed and the cross-section area of airshafts to the comfort of passengers in the subway is researched. All these work provides the foundation for the development of the one-dimensional unsteady flow prediction method for pressure waves produced by the train passing through subway tunnel.
Key Technology of Construction for Middle Tower of Three-Tower and Two-Span Suspension Bridge
Authors: Yang Yan Hua , Zhang Guo Zhi , Liu Jian Bo
Published: September 2011

Tai-Zhou Bridge, which has a three-tower and two-span, is 1080 meters long and 2 meters wide. The middle tower is a huge caisson foundation and chevron steel tower structure. It is important to make some effective technical measures to control the processes of caisson foundation’s installation, such as floating, orientation, implantation and final sunk, especially in complex conditions. Eroding model tests for the caisson foundation’s floating phase and sunken phase play an important role in the prophase installation. Information control technology could exactly guidance the sunk of cession. Finally, the linkage control of steel tower’s manufacture and operation is necessary for the precision of installation.
Dynamic Elasto-Plastic Analysis on the Steel Spatial Arch Truss with 120 m Span and 0.2 Rise-Span Ratio
Authors: Li Hai Wang , Li Guo Juan , Liu Jing
Published: September 2011

The elasto-plastic dynamic response on the steel-pipe arch truss with 120 m span and 0.2 rise-span ratio is analyzed in this paper under earthquake wave with SAP2000, the geometric and material nonlinear effects are considered during the analysis simultaneously based on the plastic hinge theory. Under the action of EL-Centro waves with the peak increasing gradually, its elasto-plastic dynamic responses have been obtained. The results show that its failure mode under the earthquake action is elasto-plastic dynamic buckling; that its critical peak acceleration of EL-Centro waves when applied in horizontal direction is 644 gal and is 375 gal when applied in vertical direction; The ratio of its maximal node horizontal displacement and its rise-height is 1/538, and its displacement ductility coefficient is 1.3 and the ratio of its bars with plastic hinge appearing when buckling is 3.28% when EL-Centro waves applied on structure in horizontal direction; The ratio of its maximal node vertical displacement and its structural rise-height is 1/1136, and its displacement ductility coefficient is 1.03 and the ratio of its bars with plastic hinge appearing when buckling is 1.5% when EL-Centro waves applied in vertical direction.
Test Study on the Heterogeneity of Coal and Model of Coupled Gas Flow and Deformation Process
Authors: Yu Yong Jiang , Zhang Chun Hui , Zhang Chun
Published: September 2011

In order to obtain the heterogeneity of coal, the mechanical tests were performed. The experimental results show that the heterogeneity of the mechanical parameters for coal follow the Weibull distribution. Then the model of coupled gas flow and deformation process for heterogeneous coal was presented and the effects of heterogeneity of coal on gas flow and failure of coal were investigated. The finding is that the effect of the heterogeneity of coal on gas flow and mechanical failure of coal can be considered by the model in this paper. Failure of coal has a great effect on gas flow.
Heterogeneous Effect and Pattern Formation on Pedestrian Queue Dynamics
Authors: Kuang Hua , Fan Yan Hong , Li Xing Li , Kong Ling Jiang
Published: September 2011

Based on the optimal velocity model, an extended optimal velocity model is proposed to simulate the movement characteristics of multi-types pedestrian queue by considering the differences among pedestrians (e.g., the differences in age and sex, etc.) and the asymmetric interaction. For the random distribution of pedestrian queue, the evolution rules of pedestrian movement and the formation mechanism of space-time pattern under two different boundary conditions are investigated. The numerical simulations show that the model can better describe the space-time distribution of pedestrian movement from microcosmic viewpoint and reproduce such important phenomena as the formation, dispersion of jams and multi-clusters movements.
Finite Element Analysis of Chaotic Vibration Isolation System
Authors: Tao Wei Jun , Huan Shi , Tan Xiang Qian , Jiang Guo Ping
Published: September 2011

A multi-degree-of-freedom (MDOF) vibration isolation system (VIS) model is established with finite element method. And the numerical simulation results of the model under axisymmetric load in a good fit to the simplified model results. The model dynamics behavior under any load also was calculated, and it makes a further analysis for the vibration isolation effect of the model.
Study on Fire Prevention Performance-Based Design of a Large Underground Banquet Hall
Authors: Bao Yan Qing
Published: September 2011

There is large fires risk and difficult evacuation in underground buildings, so it is necessary to study the development of fire and evacuation procedure in underground building. In this paper, a large underground banquet hall was chosen as an example, evacuation safety in the hall was analyzed by numerical simulation. First of all, fire model and two fire scenes were set up by using the software Fire Dynamics Simulator. Then the process of fire spread was reappeared by numerical simulation, and evacuation process was simulated by using the software PathFinderTM. By comparison with both result, it was proved that there is safe personnel evacuation in the case of effective fire-fighting facilities. According to the simulation results, reasonable recommendations about fire safety of the large banquet hall was proposed. The research will contribute to fire prevention and architecture design.
Application of Fuzzy Comprehensive Evaluation Based on Entropy Method in the General Layout and Transportation Design Optimization
Authors: Wang Qiu Ping , Yu Yan Hua
Published: September 2011

Based on the design of general layout and transportation optimization of a variety of factors, established a program evaluation system, the theory of fuzzy mathematics general layout and transportation design a comprehensive evaluation. For the fuzzy weight of each factor to determine the application of an objective method of empowerment from the perspective of information entropy to determine the factors enabling the weight of each evaluation index, fuzzy comprehensive evaluation of the results obtained. To detail with an example.
Building Component Maintenance/Repair Management: an Economic Analysis Simulation
Authors: Amani Nima , Bt Mohamed Ali Nasly , Hosseini Seyedmohsen
Published: September 2011

Starting, implementation, and operation of building facilities system are very vital, especially under limited budget. To component repair cost decisions, suitable assessment, and accurate prediction of the condition of assets are essential. The purpose of this study is at supporting the condition assessment and predicting the future of component condition by NCES condition metrics. This paper reflects on the NCES condition index process in maintenance and repair system of building components by research in similar subjects and looks specifically at the use of NCES condition index (CI) as a development tool. The result of research can be used as a guide to assist component managers and building owners to make suitable decisions about component appropriate maintenance based on limited budget during its service life.
Secondary Development of Marc Software Based on Shield Tunnel Load Structure Method and its Verification
Authors: Li Ning , Xu Jian Cong , Li Yong Song
Published: September 2011

Load structure method is commonly used in tunnel design; there are two problems for its implementation in Marc software: first, the force cannot be applied directly in Marc; second, the position of the spring around the tunnel is unknown. In view of first problem, by means of force conversion, a subroutine programming with Fortran is adopted to exert the force. For the second problem, iterative algorithm is adopted; the tension spring will exit calculation, and a comparison of the spring position in the two steps will be made, if the position is the same, the computation will finish. The work above realizes the Load structure method in Marc software and enlarges the application of Marc software in underground engineering. The verification example is given to prove the validity of the interface subroutine.
Research on the Road Concrete Mixing Uniformity Control Technology
Authors: Yue Ai Jun , Liang Jun Lin , Xiong Jian Ping
Published: September 2011

In this paper, chaos theory principle is applied in studying the concrete mixing process.Using piecewise linear mapping model describes the stirred mixture mixing and separation process.A chaotic model is established for particle movement in mixing process.In order to determine the reasonable stir parameters , the solving mixed movement method and the number of periodic windows is also given out. Suggested using chaos model determine the reasonably mixing time, proposed pre-mixed aggregate method, aggregate pre-wet method and admixture batch feeding ways to improve productivity and mixing uniformity.
Analysis on Electricity Pricing Mechanism for Cascade Hydropower Stations in China
Authors: Chen Yang , Zhao Yong , Zhang Jing Rui
Published: September 2011

For the large cascaded hydropower stations, an electricity pricing mechanism of cascade hydropower stations on large basins is proposed. The main idea is that the electricity generated by different hydropower stations on the same river can be sold to the Grid Corporation with the same price. Using five hydropower stations on the middle and lower reaches of some river in China's south-western region as a case, the pricing methods based on the Operation-period pricing method are studied. The changes of hydropower stations' earnings are analyzed through the cascade hydropower stations optimal scheduling model and simulation analysis. The results show that the mechanism is conducive to hydropower development and the comprehensive utilization of water resources, which provides an alternative of electricity market reform strategy for the national energy departments.
Identification and Appraisal of the Major Risk Accident in Coal Mine Production
Authors: Wang Yang , Ren Ying Wei , Zhou Hong Min
Published: September 2011

The coal mine safety accident is a significant problem to be faced in our country's coal mine safety management. Facing the increasing situation of coal mine safety production, it is very important to analyze the key risk factors from the every aspect of coal mine production. In this paper, the problem is analyzed by AHP. The analysis result is a very valuable reference for producers because it can provide scientific basis for coal mine safety production decision-making.
The Research on Problems of Incentive Mechanism in the Relationship of Agent-Construction System
Authors: Chen Xuan , Yan Xi Kang , Zhang Jin
Published: September 2011

In the process of adopting agent-construction system to build the non-operational construction projects invested by government, one of the key links in force is how to motive Agent Company to work positively for saving investment, and how to make them obtain reasonable returns. Applying design method of incentive mechanism related with principal-agent theory in asymmetric information case, the paper not only deeply made research on the allocation problems of cost reduction allocation, but also put forward the reference of determining the distribution coefficient.
Research on PMO Construction of Enterprise-Level for the Project General Contractor Enterprise
Authors: Zhang Jian Wei , Zhu Min Jie , Zhang Li Wei
Published: September 2011

The purpose of this paper is to explore how to establish the enterprise-level PMO of the enterprise-level project management system for project general contractor enterprise. For this, this article analyzed the basic functions of management of the traditional enterprise management, and compared the two different management system between the traditional enterprise management system and enterprise-level project management system, divided the different levels type of PMO of in the enterprise, and proposed the construction of the enterprise-level PMO.
Supplier Selection Based on the Principal Component Analysis
Authors: Jiang Hao Hao
Published: September 2011

Today’s construction quality signifies a lot to the tomorrow’s rate of return on investment for the project. The supplier selection has a pivotal role in engineering management; it occupies an important place for ensuring the construction quality in the project construction activities. So choosing suitable suppliers has become to be an important development strategy of the modern construction enterprise. The principal component analysis, one of the multivariate statistical analyses, particularly applicable to this kind of problem. This article systematically discusses this method of choice and evaluation to the supplier, and puts forward views that use principal component analysis to evaluation supplier is practical and scientific, and gives a practical case.
Assessment of Executive Indexes in Architectural Projects
Authors: Reza Maghareh Mohammad , Mohammadzadeh Sudabeh , Samiee Lari Ensiye
Published: September 2011

The purpose of this study is to evaluate and compare the executive indexes based on the opinions of project’s practitioners in the structures of Construction Office in Shiraz University of Medical Sciences (SUMS) as a case study. Accordingly, 34 practitioners of the projects were surveyed on the indexes using a questionnaire. The practitioners were categorized into two groups: Consultants and Contractors (C&C) and Managers and Experts (M&E). The completed questionnaires were assessed and analyzed and the values of indexes were calculated based on the ideas of the both groups separately. It is found that the ideas of both groups are similar or close to each other in the evaluation of 28 indexes out of 30; which may show the accuracy in completing the questionnaire and the accuracy of the methodology used. In this paper, the results of this case study are presented and discussed.
Research on the System of the Construction Project Life Cycle Cost Risk Management
Authors: Wang Hong Ping , Hu Yun Peng
Published: September 2011

Risk management is an important component of the project life cycle cost management and the project cost risk management system includes management objectives identification, risk factors analysis, risk identification, risk assessment, risk management and risk information feedback. The objectives of the project cost management can be successfully achieved through the life cycle cost risk management of various stages.
Discussion on Calculation to Equal Step Distance Different Cycle Time Flow Project Period with Intermission in Multiple Construction Storey
Authors: Wang Wen Jing
Published: September 2011

When there are storey-to-storey relationships or construction storey by storey, to discuss the flow construction cycle time with technology intermission or organizing intermission time. When the category of the construction sections can meet the requirements of formula, i.e. , has included middle storey intermission in construction period calculation formula, there is not single item; When the category of the construction sections can not meet the requirements of formula, i.e. or , there should make single item in middle storey intermission in construction period calculation, at that time, the working team can not be continuous and the working surface can make maximum connection.
Analysis of Engineering Project Management Model
Authors: Chang Jin Ming
Published: September 2011

With the development of our country socialist market economy as well as our country accession to the WTO, the construction market gradually opens, and the competition is day by day intense. It has brought the unprecedented opportunities and challenges for the engineering project management. There is therefore an urgent need to analyze the engineering project management model. The engineering project management model is one of the key factors to the successful engineering project, along with the development of society and continuing to develop. In view of this, this article first has carried on the contrast analysis to several kinds of commonly used engineering project management models, and then discusses Partnering model which has been successfully applied in recent years in the field of engineering in some European and American countries and Chinese Hong Kong. Finally, it analyzes the present situation of our country engineering project management, proposing the corresponding measures, with a view to contributing to the realization of our country engineering project optimization management.
Comparative Analysis of Several Construction Scheme of a Large-Sized Tie-Arch Aqueduct
Authors: Lei Shu Zhong , Wang Zhong Xin , Xu Jian Ting , Liu Chi Peng
Published: September 2011

An aqueduct of larger-span prestressed concrete arch structure for river diversion project is located in coastal areas, and raises difficult questions on deformation and stability control of the construction process due to greater wind load and poor soil. Due to the limited width of bracket erection, this paper put forward five possible construction schemes, and does the comparative analysis using three-dimensional finite element program, and gets the economic and reasonable one. Finally conduct a pressure test after the bracket erection, and verify the analysis results using measured stress and deformation data.
Analysis of Damages Correlation of Prestressed Concrete Beam
Authors: Zhang Feng Peng , Qiu Zhao Guo , Zhi Han
Published: September 2011

Damages correlation of prestressed concrete beam and its safety evaluation have been studied by finite element method. The influences of three typical damages on deflection of beam have been analyzed. The vertical crack damage (VC) has been simulated by pre-crack and contact elements has been set between crack surfaces, the reinforcing steel corrosion damage (RSC) has been simulated by reducing the effective area of the reinforcing steel, and the concrete strength degradation damage (CSD) has been simulated by changing the elastic modulus of concrete based on the relationship between concrete strength and its elastic modulus. Damage correlation variables have been defined, and safety evaluation method of concrete beam based on damage correlation has been discussed. The results showed that: there is a strong nonlinear correlation between VC and RSC, and the beam's safety states are significantly reduced because of the interaction of damages.
Analysis of the Breakage of the Town Housings Controlled in Flood
Authors: Huang Shu You , Ren Yu Shan , Zhang Jin Guang , Yin Zhi Gang , Zhou Jing Hai
Published: September 2011

The paper is from studying the flood experiment of the Town Housings’ structure form of the widespread existence,to explore the breakage mechanism of the town housing in flood,to guide the people how to improve the Town Housings’structure in the actuality and protect the people’s safety of the life and property.
Finite Element Analysis of the Combined Connection with Bolts and Welds
Authors: Shi Yong Jiu , Wang Lei , Wang Yuan Qing , Ma Jian Suo , Bai Run Shan
Published: September 2011

The combined connection with welds and bolds has advantages of both welds and bolts connections, and can be widely used in reinforcing the joint in steel structure. In this paper, the Finite Element Method (FEM) was taken to analyze the carrying capacity of the combined connection with bolts and welds, and the results ware compared with those come from experimental investigation. Further analysis based on FEM ware performed to research the failure mode and bearing performance of the combined connection and the contribution of bolts and welds .Advice was provided for related design.
Application on H-Beam with Trapezoidally Corrugated Webs
Authors: Shi Wen Long , Liu Xuan
Published: September 2011

The H-beam with corrugated webs is a new type of H-beam, whose webs are produced by substituting corrugated webs for flat webs. In this paper, analysis was conducted to study main design principles for H-beam with corrugated webs used in a project, including component design and joints design. Compared with H-beams, the products have superior load-carrying capacity and more favorable economic advantages.
Finite Element Parametric Analysis on Bearing Capacity of Cast Steel Spherical Joint
Authors: Lin Yan , Jiang Wei , Sun Chang Lin , Zhou Xue Jun
Published: September 2011

Nonlinear finite element analysis of the cast steel spherical joint is performed by using ANSYS program. The deformation process, the failure mode and the effects of parameters on bearing capacity for the joint are analyzed. The results show that the outer diameter of sphere D, wall thickness of sphere t, external diameter of cast steel tube d, radius of outer fillet r which is located in the connection of sphere to cast steel tube, material strength f have remarkable effects on the bearing capacity of the joint. The results also show that with the increasing of parameter t, d, r, and f, the bearing capacity increases, and with the increasing of parameter D, the bearing capacity decreases.
Numerical Analysis of Influence of Connection Stiffness on Dynamic Behaviors of Connected High-Rise Buildings
Authors: Wang Lie De , Yuan Wei Bin , Ye Cheng Min
Published: September 2011

With the increase of the height, the lateral stiffness of high-rise buildings decreased. The high and flexible structures would have large movement when they are suffered lateral forces arising from earthquakes and winds. In order to investigate the influence mechanisms on dynamic behaviors of three-towers-connected high-rise building that caused by connection stiffness, various finite element models with different connection location and number are established and the dynamic properties are analyzed by finite element software ADINA. The results show that the influences of connection stiffness on structural natural cycle are obvious, and the impacts on displacement and acceleration response are minor.
Numerical Simulation of SHPB Experiment and Analysis on Stress Wave
Authors: Wang Ru Heng , Yao Hua Chuan , Jia Bin , Wang Lin
Published: September 2011

Concrete is a typical kind of rate sensitive material. In this paper, the concrete specimens were tested in the SHPB experiment system. Based on H-J-C constitutive model, the SHPB experiment was simulated by LS-DANY. The stress-strain curves which were gat from numerical simulation in the LS-DANY were compared with the stress-strain curves which were gat from SHPB. The results showed that the H-J-C constitutive could simulate the dynamic characteristics of concrete both under room temperature. The result also showed that the concrete was strain rate sensitive. Based on the numerical simulation, the stress wave in the SHPB system was studied. The research of the numerical simulation showed that the stress waves tended to become stable after several oscillations in the incident bar. At the same time, stress wave of elements in r=0 (The distance of elements to the axis was 0) were bigger than the stress wave of r=0.5R (The distance to the axis was 0.5R) and r=R (The distance to the axis was R).
Load-Carrying Behaviour of Dowel-Type Timber Connections with Multiple Slotted-in Steel Plates
Authors: Fan Xin Hai , Zhang Sheng Dong , Qu Wen Jun
Published: September 2011

The multiple-shear dowel connection with slotted-in steel plates is one of the most efficient joints for large cross section timber structures. Experiments were performed on dowel-type timber connections with one, two and three slotted in steel plates under lateral loads parallel to the grain. Test variables include the number of steel plates, the spacing of the steel plates, and the dowel diameter. Results show that the load-carrying capacity of the dowel-type connection increased as the number and spacing of steel plates in the same thickness of timber specimens. Finally, a model of the load-carrying capacity of multiple shear steel-to-timber connections is presented, which showed good agreement with the results obtained in the experiment.
Experimental Study on Seismic Performance of Reactive Power Concrete Box Piers
Authors: Wang Fei , Fang Zhi , Yin Xin Feng
Published: September 2011

Designing the reasonable cross-section and the structural conformation, three Reactive power concrete box piers samples were designed and studied under the constant axial force and reversed horizontal loads. The effect of the reversed horizontal load on the seismic performance of RPC box pier was studied. Such seismic performance as ductility, hysteresis curve, skeleton curve, etc. of RPC box piers is studied by pseudo-static test on three RPC box piers. The simulation results shows that RPC box piers exists excellent performance of resisting seismic force, the direction of horizontal load significant affect that performance, and the performance of resisting seismic force for the pier loaded by the force from main axial direction are better than that from other direction.
Analysis of Long Deep Pit of Small Deformation of the Surrounding Environment Control
Authors: Ding Ke Sheng , Xu Chang Ling , Li Xu
Published: September 2011

It is very difficult to control diaphragm wall deformation in 30mm, the project which depth 25m, long side 530m, and the sounding environment is complex. Tianjin Station transportation hub project attained the requirements of control on the ground settlement around foundation, the settlement of buildings and structures. We have comprehensively analyzed the field monitoring data and the three-dimensional numerical simulation, and obtained deformation of the surrounding environment and control of variation Index for this type of foundation.
Axial Compression Test and Capacity Caculation of RC Columns Consolidation with BFRP, CFRP
Authors: Huo Bao Rong , Zhang Xiang Dong
Published: September 2011

Abstract：Twenty-one RC columns were made, including nine RC columns wrapped with BFRP, nine RC columns wrapped with CFRP, three RC columns without any reinforcement, to conduct the comparative study of axial compression. The result shows that the bearing capacity of the RC columns reinforced with the fibers increases obviously. The bearing capacity of the RC columns with CFRP is higher than that with BFRP, but the difference is not obvious. The displacement ductility factor increases, but its increase rate becomes slow with increasing layers of fiber cloth, so the most economical layer number is 3. Based on the confinement mechanism of FRP cloth and the calculation formula of the bearing capacity for common RC column, the formula of the bearing capacity for reinforced RC column with BFRP cloth is proposed. The result of calculation basically tallies with the number in experiment.
Analysis of Rigid Hangar Door Spatial Modeling Technique Using STS-PMSAP
Authors: Jiang Ji Hong , Xu Zhong , Li Kai , Wang Xing Zhu
Published: September 2011

This paper takes the engineering project of push-pull type hangar door as an example, applying the large-scale general-purpose program STS in PKPM software to build a spatial model, PMSAP program to analyze the rods with finite element, and STS program to design connection of nods and post-processing of construction drawings. It puts forward an effective solution when designing similar steel door and special steel structure and provides guidance for practical engineering design.
Dynamic Characteristics Analysis of Tower Columns of Ship Lift System
Authors: Ma Hong Wei , Wang Ji Wei , Xu Ji Xiang , Ding Xiao Qiu
Published: September 2011

Based on the Xiangjiaba Hydro Project, dynamic characteristics of large high-rise structure under El_Centro seismic wave were investigated in this paper. 8-node hexahedral isoparametric elements[1] are used to the solid element in the 3-D finite element model. In order to increase the efficiency of the calculation, the Newmark- [2] method is implemented. By means of seismic waves, the displacement responses of the Xiangjiaba Hydro Project are analyzed in detail. The results, which are obtained for displacement responses of tower columns of ship lift, show that calculated dynamic results of the tower column can meet the design requirements.
Analysis on Collapse Accidents of Two Steel Structural Buildings
Authors: Tang Hong Yuan , Yang Bin
Published: September 2011

Through the detection and appraisal of two collapse accidents of steel structural buildings, the reasons of them are overall analyzed based on the design, construction and material of the steel structures. Combining the characteristics of light steel structure itself, some correlated suggestions are proposed including this kind of structure design and construction.
Discussion on Legislation of Rural Safe Drinking Water in China
Authors: Liu Zhen Hua
Published: September 2011

There is a serious problem of rural unsafe drinking water in china,but only it is essential for legislation to solve comprehensively.Through the analysis of the legislative background, legislative basis and legislative framework system of rural safe drinking water,the paper explores some legislative issues.Water source contaminated by industrial pollutants, agricultural pollutants, domestic pollutants, is the biggest obstacle to rural drinking water safety.Rural safe drinking water legislation have sufficiently the constitutional basis and the basic law basis. Legislative framework system is composed of drinking water source protection,rural water supply planning,project financing,operation and management mechanisms,emergency warning system, pricing system, supervision system etc. Rural safe drinking water legislation will play a significant role in solving fundamentally the problem of rural safe drinking water.
Numerical Modeling and Parametric Analysis of Multiplanar CHS KT-Joints with K-Plane Overlap and Out-of-Plane Gap
Authors: Sun Jian Dong , Lv Jun Li , Du Tao , Li Yang Xian
Published: September 2011

A finite element model simulating the experiment on multiplanar unstiffened CHS KT joints with K-plane overlapped and out-of-plane not (KT-IPOv joints), with the background of Suzhou International Convention & Exhibition Center, was advanced and validated by comparing failure mode and the ultimate capacity with experimental results, which is shown to be in good agreement with the test result. Using this model, the effect of non-dimensional parameters on ultimate capacity of KT-IPOv joints were studied, and resistance comparison between multiplanar KT-IPOv joints and uniplanar overlapped K-joints was carried out. The results of FE parametric Analysis conclude that multiplanar parameter ζ t, τT and βT have not significant influence on the ultimate strength; the effect of non-dimensional parameter βK, τK, γ, Ov on the resistance of multiplanar KT-IPOv joints has the same as that of uniplanar overlapped K-joints; the strength of multiplanar KT-IPOv joints have been not significantly influenced by the configuration with the brace inside T-plane which it is not subjected to force; it is suitable and feasiable that ultimate capacities of KT-IPOv joints predicted by formula of uniplanar K-joints.
Empirical Formula Considering the Smoke Ventilation for Air Temperature in Large Space Structure under Fire
Authors: Liang Jin , Xue Su Duo , Li Xiong Yan
Published: September 2011

Abstract.The fire smoke is one of the most important factors for the fire temperature field. Once the fire smoke has been exhausted effectively, the fire temperature will be reduced and the fire-resistance performance of steel structures may be improved as well. However, the research on the fire temperature in the space structures is almost bold, which could lead to the theoretical analysis result on fire temperature is quite different from the real condition. Accordingly, the air temperature condition on fire for large-space structures has been analyzed. Taken into account smoke ventilation, the empirical formula for air temperature in large space structure under fire has been modified.
Energy-Saving Algorithm Design and Simulation in Intelligent Street Lamp System
Authors: Yu Ji Ming , Wu Feng , Yan Xiao Yong
Published: September 2011

Abstract. this paper proposes an energy saving algorithm based on wireless network in the intelligent street lamp system, which can real-time intelligent detect conditions illumination, person’s position and other infomation, street lamps builds a WSN network and collaborative adjustment its illuminations according to the information collected by its sensor device,compared with the current lighting system, the system more benefit in energy saveing, extending the lamp life, reduce light pollution on the environment. For energy conservation and environmental protection construction, intelligent street lamp system play an important role.
Internal Force and Deflection Calculation of a Kind of Cellular Hollow Flat Slab Floor
Authors: Han Jin Sheng , Cong Shu Ping
Published: September 2011

The structural form of a kind of cellular hollow flat slab floor using thin wall plastic boxes was introduced. The equivalent frame method, which was used to analyze the internal force of this kind of cellular hollow flat slab floor, was discussed. Finally, the method to calculate the deflection of cellular hollow flat slab was investigated and some improvements in this method were presented. The effects of the cracks on the stiffness and deflection of hollow flat slabs were taken into account in this method to decrease the error of elasticity calculation results.
Model Test Research on Mechanism of Geogrid-Reinforced and Pile-Supported Embankment
Authors: Zhang Chao , Wu Wei , Chen Rong Jun
Published: September 2011

It has studied the characteristics of the work force of the geogrid-reinforced and pile-supported foundation through eight loading model tests, and analyzed the effects that varied pile spacing, reinforced floors, the paving position of the reinforcement have had on the stress concentration ratio of the pile to the soil of the geogrid-reinforced and pile-supported foundation, the pile axial force, the tension of geogrid.
Damage Identification of a Beam-Like Structure Using Element Modal Strain Energies and Natural Frequencies
Authors: Zhao Jian Hua , Zhang Ling
Published: September 2011

A two-step damage identification method based on elemental modal strain energies and natural frequencies has been presented for a beam-like structure. In the first stage, this method makes use of the change of elemental modal strain energy before and after damage to locate the potential damage regions. And in the second stage, a damage identification algorithm based on the frequency changes is developed to calculate the damage extent and further determine the actual damage locations. The performance of the proposed method is numerically demonstrated by a simply supported beam with two damage cases. Results indicate that the method can identify the damage location and quantify the damage severity accurately in a beam-like structure.
Theoretical Analysis on Compacting Effect of Lime Compaction Piles
Authors: Wang Xue Lang , Zhu Yan Peng
Published: September 2011

According to the formers' study of theory and experiment, to analyze the mechanical properties on compacting effect of lime compaction piles. The effects of collapsible loess reinforced by the lime pile have been analyzed. The theory of collapsible loess reinforced by lime pile has made useful exploration. Through the round hole expansion theory to lime piles under expansion compacting process, the elastic-plastic solution on compacting effect of lime compaction piles has been solved. The effective radius of expansion and the law of stress change between the piles can also be determined. Finally using the finite element method to verify the proposed method, and the results show that the proposed method is effective and can provide theoretical basis and guidance for the similar projects.
The Causes Analysis and Control Measures about Rapid Floor Heave in Deep Mine
Authors: Zhang Sheng , Bei Zheng , Zhang Yi Fei
Published: September 2011

With the depth of coal mine increasing, it appeared a phenomenon of rapid floor heave in some roadways in a short time, which threaten greatly to the normal mine production and the lives safety of workers. The causes and control measures about rapid floor heave are analyzed in this paper. Which has a certain reference values for preventing and controlling rapid floor heave in deep mine.
Research on the Data Collection Method in Road Slope Detection Based on 3D Laser Scanner
Authors: Zhang Jia Ping , Wu He , Feng Yu Qin , Yang Guang , Wang Guo Feng , Ge Qi
Published: September 2011

The foundation of slope stability analysis is the data acquisition of the deformation. How to obtain the data detection point directly and efficiently is the access to achieve real-time predict method to slope stability. By introducing the Trimble GX 3D laser scanning data acquisition method, road slope detection method is put forward. According to the scanner system and working principle of the implementation steps, the slope detection and data processing procedures are developed and present references to the slope detection. With specific engineering application analysis, the feasibility of such acquisition is verified.
Wind-Induced Response Analysis of Double Layer Cylindrical Lattice Shells
Authors: Li Min , Yao Yong , Yang Jion
Published: September 2011

Analysis of wind-induced response of double-layer cylindrical reticulated shell by different methods of calculation . The results showed that the wind-induced response of the structure was increased and too safety by using existing load code calculation. Calculation of wind-induced response of double-layer cylindrical shell by using random vibration method, can only be considered first step mode, while the effect of high order mode could be ignored. The whole process of wind-induced response of the structure can be obtained by using combination of methods of harmony superposition and time-history analysis method, which can provide guidance for project design.
Indoor Research of High-Modulus Asphalt Concrete with the Added Calcium Sulfate Whisker
Authors: Zhang Hong Guo , Hao Pei Wen , Wang Xiu Shan
Published: September 2011

Abstract: This paper mainly studies the application effects of calcium sulfate whisker, a new kind of high-modulus and inorganic-modified material in asphalt mixture. According to the Marshall test, this research designs the ratio of the mixed material, so as to determine the mixed quantity of calcium sulfate whisker. Based on the related studies about road performance, it makes a comparative study among these three mixed materials. The results indicate that the high-modulus asphalt mixture with modified calcium sulfate whisker can effectively improve the mixed materials’ stability in high temperature, water stability and anti-fatigue performance; meanwhile, it doesn’t decrease their performance in low temperature. Therefore, it is helpful to solve the common problems in highway engineering, such as rutting, water damage and so on. The feasibility analysis proves that the application of high-modulus asphalt mixture with modified calcium sulfate whisker could achieve greater economic and social benefits while ensuring the good road performance of the road.
The Analysis of the Reliability and Design for Mechanical Anchorage of HRB500 Steel Bars
Authors: Rong Xian , Liu Peng Cheng , Li Xue
Published: September 2011

The factors on mechanical anchoring performance of HRB500 steel bars, such as concrete strength, concrete cover thickness, diameter of steel bar, anchorage length of steel bar and transverse reinforcement ratio, were studied based on pull-out tests of 45 specimens. And the formula of mechanical anchoring bond strength for HRB500 steel bars was concluded by statistical regression analysis method. Through the reliability analysis, the mechanical anchoring length of design value and the table of conversion ratio between mechanical and direct anchoring length of HRB500 steel bars have been proposed. So it could be used as a basis for practical projects. The results indicate that the mechanical anchorage length of HRB500 steel bars can be still designed with the formula proposed in GB 50010-2002 “Code for design of concrete structures”.