bluuebunny/crossref_metadata_2025 huggingface dataset:
Critical Risks Influencing the Application of EERTs in Australian Green Office Buildings
Authors: Zhang Guo Min , Mosly Ibrahim , Setunge Sujeeva , Jin Xiao Hua
Published: November 2012

This paper aims to explore the risks of applying energy efficient and renewable technologies (EERTs) in Australian green office buildings. An online questionnaire survey was conducted in several Australian states and territories to identify and evaluate the potential critical risks that may influence the implementation of EERTs. Consisting of architects, engineers, project managers, and contractors, participants of the survey were asked to evaluate the generic and some specific EERTs risks occurring in the implementation of a selected number of commonly used EERTs in Australian green office buildings. In addition, the participants were asked to pinpoint those stakeholders who were the most affected by the risks and the lifecycle stage of the technology or buildings at which these risks might mostly occur. The data analysis results shows that uncertain governmental policies were identified as the critical risk with the highest mean risk impact value, Lack of access to funds and Presence of system constraints were the most popular risks with influences on most of EERTs. It also identifies the EERTs owners as most affected stakeholders by EERTs risks and that the majority of these risks occur during the operation stage.
Economic Thinking of Landscape Design in Residential District
Authors: Wang Ning , Sun Wei
Published: November 2012

The landscape design has the characters of artistry, scientific nature and the efficiency. This article researched the cost factors of landscape design, and the study has important practical significance in enhancing the benefit of the residential district landscape investment.
Discussion on Construction Contract Management
Authors: Cui Bao Xia
Published: November 2012

Construction contract is a code conduct for both the contractor and the outsourcer to abide in the Market Economy environment, as a result, the enforcement and improvement of contracts management becomes essential. By analyzing the issues laying in the construction contracts management and their causes, this paper puts several proposals for enhancing the construction contracts management.
Partner Selection for Partnering Mode Based on Vertical Projection Method
Authors: Nie Xiang Tian , Lan Jing Hai
Published: November 2012

Selecting excellent partnering partners is crucial for project implementation．In view of the drawbacks of traditional methods which only consider the rigid index such as business index, technical data and management data, this paper establishes an evaluation system which considers soft level index and is appropriate for the project of partnering mode. From this system, this paper sets up a comprehensive evaluation mode for partners’ selection based on the entropy and vertical projection method. This mode provides a simple and scientific new way for selecting excellent partnering partners.
Wind-Induced Response Analysis of Steel Tower Structure
Authors: Wan Chun Feng , Wang Jiang , Zhu Hong , Huang Lei , Wang Hao , Xu Zhao Dong
Published: November 2012

In this paper, autoregressive (AR) method is firstly introduced to simulate wind speed time series. The agreement of the simulated wind speed spectrum to the target spectrum is verified. A 42m-high steel tower subjected to wind load is analyzed using ANSYS. Through modal analysis, it can be found that the first several modes of the structure are all translational vibration modes. Torsional vibration modes and local vibration modes appear from the 3th order mode. Meanwhile, time history analysis is applied to analyze the structural response. Results show that, under wind loads, the steel tower has large stresses in the chords which have abrupt section area change.
Research on Ultimate Bearing Capacity of Single-Layer Cylinder Latticed Shells Considering the Influence of P-δ Effect
Authors: Du Wen Feng , Zhou Zhi Yong , Zhu Pei
Published: November 2012

The ultimate bearing capacity of the single-layer cylinder latticed shell structure, calculated without considering the single-member instability(P-δ effect), was not consistent to the actual value of ultimate bearing capacity in practice. The ultimate bearing capacity of the single-layer cylinder latticed shell structure was studied in detail by proposing a method of multi-element simulation, considering the member instability. The value of the ultimate bearing capacity decreased by 1.2% after considering the member instability taking a single-layer latticed shell structure with a 40m span as example. The analysis results show that the value of ultimate bearing capacity is tiny affected for the single-layer cylinder latticed shell structure with a small span and high rise-span ratio
Monitoring and Test on Load Bearing Transform of Large Span Steel Truss of Archaized Tower
Authors: Li Xiao Ke , Han Peng Fei , Wang Zhi Hao , Liu Jian
Published: November 2012

Combined with construction of large span steel truss in the bottom of an Archaized tower, stresses in key members, displacements in control nodes and temperature variation were monitored and measured before and after moving construction temporary constraints. The unloading process based on the rule which constraints were unloaded gradually from outer to inner and four steps were carried out in the field. Compared with measured and theoretical results, they can meet with each other perfectly. The mechanical sensibility of steel stresses with temperature changing were also revealed. Then the reasonable conditions of unloading for the steel truss were advised. The process and method given in this paper provides the basis for safely construction of the Archaized tower, which would be reference for similar load bearing transform of steel structrues.
A Review on the Connection of FRP Bars
Authors: Yuan Guo Qing , Zhu Nan
Published: November 2012

Just like the steel bars, the connection of FRP bars is needed in engineering application. But most of the steel bars’ traditional connection ways are not suitable for FRP bars because of the differences of the material properties. With the engineering application standards’ appearing, it is becoming an urgent need that we should have one or some connection methods for FRP bars which can be selected and used by engineers. This paper presents a brief overview about the research progress of FRP bars’ connections, gives the definition and the design principles of FRP bars’ connection, emphatically introduces the research progress of coaxial connection of FRP bars, and discusses the off-axis connection ways. At last, we put forward some works that need to be further researched.
Study on the Ductility of T-Shaped Short-Limb Shear Walls (I)
Authors: Guo Di , Feng Hua , Li Zhi Peng , Liu Jie Yu
Published: November 2012

In this paper, the author takes on the experiment of low cyclic load and analyzes the tenacity and ductility characteristic of the specimen, and simulates the elastic-plastic failure modes of T-shaped short-limb shear walls by using the finite element software ABAQUS and applying the damage plasticity model to select the proper unit type. Results indicate that the mechanical behavior of T-shaped short-limb shear walls under the condition of horizontal load force may be accurately simulated by the method proposed in this paper.
Three-Spring Model for Spatial Walls
Authors: Si Lin Jun , Chen Gong Lian , Wang Hua Li
Published: November 2012

Shear wall structures, frame-shear wall structures and frame-tube wall structures are usually used in tall buildings, especially in China seismic regions. How to simulate the mechanical behaviors of these walls is the key to elastic-plastic analysis for tall buildings. Based on two-spring model, a nonlinear model for spatial walls is proposed. In this model, the axial, shear and flexural elastic-plastic deformation of the walls can be considered, the deformation compatibility between the wall and beam elements is also considered. The model was used to analysis the elastic-plastic behavior of spatial walls. Calculation example for verifying the model indicates that the result obtained by this method has the characteristics of fewer degrees of freedom and high accuracy. Therefore the nonlinear model for spatial walls provides a practical and efficient analysis method for tall buildings with complex type.
Optimal Calculation Method of Eccentric Bearing Capacity of Concrete-Filled Steel Tube Short Columns
Authors: Zhang Jian Wei , Kuang Xing Jie , Bai Wei Feng , Wang Juan
Published: November 2012

The currently formulae with many coefficients are too complicated to calculate the bearing capacity of concrete-filled steel tube (CFST) short columns. In this paper, an optimal calculation method was proposed for calculating the eccentric bearing capacity of CFST short columns by means of mechanical derivation. Additionally, the calculating results are compared with experimental data. It is shown that the optimal calculating formulae are highly accurate and easily applicable in engineering design.
Study on Thermal and Structural Behavior of a Cable-Stayed Bridge under Potential Tanker Truck Fires
Authors: Liu Yong Jun , Ning Bo , Wang Yu
Published: November 2012

Bridges are important parts of traffic systems and need to provide the necessary safety for the traveling public. Fire is one of the most severe hazards that bridges may subject to during their lifetime. In recent years, due to rapid development of transportation systems, as well as increasing transport of hazardous materials, bridge fires have become a concern. Bridge fires caused by crashing of vehicles and burning of gasoline are much more severe than building fires and are characterized by a fast heating rate and a higher peak temperature which could lead to bridge collapse. Bridge failures during a fire can result in the disruption of commerce and services, and most importantly the loss of human life. It has become necessary to consider the potential exposure of bridges to flames from oil or liquefied petroleum gas fires. In this paper, potential fire scenarios relevant for a cable-stayed bridge crossing the Yangtze River are analyzed firstly, then the temperature distribution in key elements and the global structural behavior of the bridge under tanker truck fires is calculated by using general purpose finite element analysis software ANSYS. Numerical simulation results demonstrate that cable-stayed bridge may collapse under some specific fire scenarios and it is necessary to consider fire safety in bridge design.
Construction Technology of Transverse Bonded Structural Steel for Strengthening PPC Hollow Slab Bridge
Authors: Chen Ji Hao , Bai Li Hong , Zhao Shun Bo , Yu Xiong Huai , Chen Cheng
Published: November 2012

Combined with the actual engineering, this paper presents the construction technology for the transverse bonded structural steel for PPC hollow slab bridge. The steel plate and channel steel were first respectively bonded on the top and bottom of the PPC hollow slab by structural adhesive, and then they were connected by bolt. The transverse connection is formed between hollow slabs to enhance the structural integrity of the bridge. The bolt connection may subject to the structural adhesive fatigue failure due to vehicle loads. Compared with other strengthening method, this method has the advantage of saving investment and construction time.
Anti-Overturning Stability Numerical Analysis of Single Column Bridge
Authors: Zhang Xian Min , Dong Bin
Published: November 2012

Anti-overturning stability numerical analysis of a concrete single column bridge is introduced in this paper. The bearing capacity of the bridge is calculated under the condition of the bearings disengaging. The major factors making the bridge overturn are analyzed, and the preventive measures are given out. The results provide reference for the design of similar projects and driving demand.
Ocean Engineering Concrete Using High-Volume GGBS
Authors: Li Ke Liang
Published: November 2012

To improve ocean engineering durability, concrete using high-volume ground granulated blast-furnace slag (GGBS) was prepared, its mechanical property and durability were investigated. 4% activator and 61% GGBS were used to replace 65% cement in cementitious material. Activator was used to improve workability, volume stability and early strength of high-volume GGBS concrete. Ocean concrete using high-volume GGBS has good impermeability with small gas diffusion coefficient and relative permeability coefficient. As the good property of resistance to chloride-ion penetration with a low effective diffusion coefficient, it can protect steel-bar from corrosions. Property of frost resistance is also favorable. Expansions caused by alkali-silica reaction and sulfate attack fall down markedly after using high-volume GGBS. It is proved that the high-volume GGBS concrete with good mechanical property and durability is applicable to the constructing of ocean engineering concrete.
Stability Analysis of Underground Caverns by Jointed Finite Element Method
Authors: Wu Ji Chang , Zhang Yu Min , Li Hong Xia
Published: November 2012

The jointed finite element method (JFEM) is used to analyze the deformation and failure characteristic of fractured rock mass and anchor reinforcement effect for the water collection shaft of the main power house of Dagangshan Hydropower Station. The results show that the JFEM not only simulates the actual rock mass structure very well, but also gives the reasonable simulation results for the common unstable rock mass. The JFEM may accurately simulate the major deformation characteristic and collapse mechanism, which is another effective way to analyze the stability of fractured rock mass. The on-site monitoring results show that the anchor reinforcement is effective for the water collection shaft
Analysis of Typical Example and Genesis of Landslide Triggered by Wenchuan Earthquake in China
Authors: Dong Jin Yu , Li Zi Li , Huang Zhi Quan , Yang Ji Hong , Yang Guo Xiang
Published: November 2012

As the main geohazard triggered by Wenchuan earthquake, landslide is widely distributed. It caused many people lost their lives and incipient fault. This paper analyzes the genesis of these landslides from the aspects of geomorphy, geological structure of slope body, rock characters, earthquake motion, stable condition of slope, weathering effect and stream action. Strong earthquake motion near the fracture zone and geological structure of slope body are the main reasons caused the slope failure. Take Wangjiayan landslide as the typical example, the genesis of earthquake-induced landslide is analyzed. Strong earthquake motion near the fracture zone and the extroversion structural surfaces are the main reasons caused the slide, and great slope and instable state of slope can also promote the slop failure. Failure process of slope is also analyzed.
Robust Statistics Analysis of Proficiency Test Result of Cement Chemical Composition
Authors: Jia Yan , Cheng Xiao Tian , Wei Dong
Published: November 2012

Test result of cement chemical composition was obtained from the participating laboratory through organizing and performing the cement proficiency test plan. After performing the robust statistical analysis to the result, the test proficiency of the laboratory is evaluated, the proficiency of each laboratory on chemical composition analysis and test is objectively reflected.
Effect of the Fracture Toughness of Materials (Kc) on Fatigue Crack Propagation Rate
Authors: Gu Li Xiong , Xu Zhong Yong , Liu Zhi Fang
Published: November 2012

In this paper, the fracture toughness of materials, , effects on fatigue crack propagation that can be quantified using the dynamical coefficient mechanics (DCM) model. And we can not only change the material with high value, but also should take other methods into consideration to decrease the fatigue crack growth (FCG) rate when replacing material can’t obviously decrease the FCG rate, which were examined objectively by the test results from literature.
The Effects of Two Anti-Corrosion Processing Mode on the against Slip Coefficient between Friction Surface of High-Strength Bolts Connection
Authors: Hui Lian , Li Guo Xin , Peng Yi Liang , Xia Shan Jing
Published: November 2012

Both hot-dip coating and zinc-rich coating can improve the longevity of the steels, but the coarseness of the steels covered the different coating will be different. The steels with the two coatings, a sort of hot-dip high-strength bolts connection were used to study the against slip coefficient between frictions. The results show that a higher against slip coefficient between frictions of high-strength bolts connection with zinc-rich coating was obtained. When MoS2was used on the hot-dip high-strength bolts, the standard deviation of the torque coefficient of the bolt connection pairs was decreased and a highest against slip coefficient between frictions was obtained.
Structural Damage Identification Based on Moving Load and High-Order Spectrum Analysis
Authors: Wang Bu Yu
Published: November 2012

Moving load could enhance damage-structural nonlinear character. High-order statistical analysis described character of non-stationary signal more exactly than traditional fourier spectrum based on second-order statistics analysis. The result of high-order spectrum analysis was two-dimensional，and spectrum entropy of different frequency can extract its intrinsic information and characters from it. Using these characters, the structural damage pattern could be recognized by neural network. The validity of this method was reviewed by a beam under moving load. When structure has damage, its state information can be extracted availably from high-order spectrum entropy of structural vibration, and it isn’t sensitive to noise. It can be used as eigenvectors of pattern recognition based on neural network.
Optimal Sensor Configuration for Bridge Structures Following a Probabilistic Approach
Authors: Yin Tao , Zhu Hong Ping , Li Dian Qing
Published: November 2012

In this paper, a statistical methodology is introduced for identifying the most effective way to install a limited number of sensors on a typical distributed-parameter system, i.e., a three-span continuous bridge model with two elastic supports to extract as much information as possible. This is performed by minimizing the uncertainties associated with the identified bridge modeling parameters. In the proposed methodology, the information entropy is employed as a measure to quantify the uncertainty of the identified structural modeling parameters. The problem of optimal sensor placement is then formulated as a continuous optimization problem, in which the information entropy is minimized, with the sensor configurations as the minimization variables. The generally used discrete-coordinate systems modeled by the finite element (FE) method can only approximate their actual dynamic behavior, which would in turn influence the sensor configuration results, and the sensors are confined to be only put on discrete nodes related to the coarse mesh scheme usually employed. For structures such as bridges belonging to typical distributed-parameter systems, it’s more reasonable and convenient to be modeled as continues-coordinate system with analytical formulation. It’s the main purpose of this paper to develop a sensor placement method for continues-coordinate systems following the Bayesian theorem and the information entropy method, with the binary-encoded genetic algorithm (GA) employed as the optimization technique.
Application of Wavelet Packet Transform and Neural Network to Detect Damage of Elastic Thin Plate
Authors: Xie Dong Hai , Tang Hong Wei
Published: November 2012

In recent years,most existing engineering structures which have approached their normal life span, such as concrete plate, concrete beam etc., Almost all of these architecture structures are subjected to damage due to external loads, initial design defect etc. Structural damage detection and assessment has been becoming a focus of increasing interest in civil engineering field. However,At present, the study on structural damage detection is still at initial stage and the adopted main approaches are theoretical analysis and numerical simulation, but physical models are scarce. This leads to the yielded theories and methods are not sufficiently applicable for practical engineering application. Aiming at this, this paper focuses on developing effective methods of using wavelet and neural networks to detect the damage of elastic thin plate due to their extensive applications in civil engineering.
The Design of the Sewage Device in Seepage Monitoring Instrument for Dam Foundation
Authors: Deng Huan , Zhang Zhen Hua , Li Jie , Yuan Mi , Wang Fei Yu
Published: November 2012

The water seeping from dam foundation often contains dissolved matter from the seepage channels. The deposition of the dissolved matter will easily block the monitoring instruments. To solve this problem, a sewage device in seepage monitoring instrument for dam foundation is designed. Several experiments on the capacity of the sewage device on sewage flow conditions are set. The results of the experiments proved that the sewage device for dam foundation seepage monitoring instrument is feasible to reduce the precipitates.
Construction Quality Control of Dynamic Compaction Method Treatment Collapsible Loess Foundation
Authors: Zhao Zheng Rong , Yang Hong Xia
Published: November 2012

Through the field test data comprehensive analysis, the construction parameters of dynamic compaction can be obtained.The comparison of the before and after dynamic compaction reinforcement effect shows that the collapsible loess foundation after the dynamic compaction treatment, the soil dry density increases by approximately 10%, void ratio reduces by about 15%,bearing capacity increases by 15% or more and collapsible disappears. According to the construction practice of large-scale dynamic compaction method in the south line of Jinan around the city expressway, discusses the key problems should be noted during the construction process and treatment methods of special sections, quality testing methods and evaluation standards.
The Rail Bridge Bearing Long-Term Online Monitoring and Analysis
Authors: Liu Jun
Published: November 2012

Discussed the principle and the installation of the fiber bragg grating sensor of the displacement and the temperature. Combined with the wireless network technology to construct the monitoring system of the rail bridge bearing, which run long-term continuously and online to monitor the displacement, the temperature and the relations between them. Analysed the mass historical monitoring data from the system in detail and gained the result. This paper revealed the physical significance of the monitoring data, provided the basis for the maintenance.
Numerical Simulation Analysis and Engineering Applications on the Double-Side-Wall Heading Step Bench Excavation of Large-Cross Section and Shallow Tunnel
Authors: Li Wen Hua , Zhao Da Jun , Zhou Shi Sheng
Published: November 2012

With the pace accelerating of development of urban rail traffic in large and medium-sized cities, urban subway and railway lines need to construct shallow and large-cross section tunnels and especially large-cross section tunnels. Large-cross section tunnel constructions make big influence on the surrounding buildings, roads and environment. How to build underground tunnel fast and safe in the downtown has become an problem which needs to be solved urgently. This article is for the technology of city large-cross section and shallow buried-tunnel, relying on the phase 1 of rail transit no.2 in Changsha, which combined with construction characteristics of the excavation method, double-side-wall method and step method, numerical simulation analysis on influence of the large-cross section tunnel disturbance in the surrounding rock, and provides the necessary technical support.
Risk Assessment of High-Speed Railway Tunnel Construction Based on Fuzzy Synthetic Evaluation
Authors: Wu Li , Zhang Liang Gang , Lai Yun , Chen Jian
Published: November 2012

Because of its large scale, long cycle and complex construction, the high speed railway tunnel construction exists many uncertain risk factors which are random and fuzzy, that makes it difficult to do quantitative analysis by general research methods. A synthetic evaluation index system for tunnel construction risk of high-speed railway is established by analyzing the factors that influence high-speed railway construction, and the analytic hierarchy process is used to determine the weight of each stage factor. Based on the hierarchy of each factor, a model of three-stage fuzzy synthetic evaluation is proposed, the fuzzy sets method is used to determine membership function, and risk ranking is also classified. The proposed method is applied to a Tian jiashan Tunnel construction of Shanghai-Kunming (Hu-Kun) high-speed railway. The analysis results show that the method is reasonable and practical, and it will be taken as an example by other similar projects.
Research on Numerical Simulation of High Filling Culverts Foundation Failure Mode
Authors: Cao Ji Wei , Sha Cheng Man , Liu Bin , Sun Yue
Published: November 2012

Foundation failure mode of high filling culverts involves calculation theory and method of subgrade bearing capacity, and it has great theoretical and practical values. After model of the culvert has been established, finite difference method will be used to do the numerical simulation in FLAC3D. Reaserch suggests that traditional Terzaghi/Meyerhof failure mode are not suitable for relatively deep buried subgrade of high filling culvert. Foundation failure of high filling culvert is caused by difference in stiffness and earth press, which result in settlement difference, and then forms subsidiary shear stress on the sliding surface. When stress value reaches shear strength of the foundation soil, shear failure occured.
Research about the Rationality of Neighborhood Tunnel Spacing
Authors: Yang Bo Wen , Yang Shuang Suo
Published: November 2012

Analysis of the surrounding rock stress distribution of neighborhood tunnel by using numerical simulation. Based on Cullen-Moore Theory, build a mathematical model of 1st principal stress σ1, 2nd principal stress σ2, internal friction angle φ, and cohesion c, then, make a expression of tunnel spacing safety factor A. Analysis a real tunnel project and evaluate its surrounding rock stability with safety factor A as the index. Propose an analysis method of judging the rationality of tunnel spacing.
Experimental Study on the Technology of Middle Empty Hole in Parallel Hole Cut Blasting
Authors: Yang Ren Shu , Che Yu Long , Tong Xing , Mi Yu Lin , Feng Lin
Published: November 2012

In order to reduce the adverse effect of the blasting vibration velocity to residents in the urban subway blasting excavation construction, and made it meet the requirements of design, based on the stress concentration effect of empty hole, carried out the research of middle empty hole in parallel hole cut blasting. Adopted the technology of middle empty hole in parallel hole cut blasting, by measuring the blasting vibration velocity, the utilization rate of borehole, the half eye tracking rate, and so on, the results showed that the blasting vibration velocity of cut blasting was 0.69cm/s, the blasting vibration of expansion slot blasting was 1.27cm/s, the borehole utilization was 90%, and the half eye tracking rate of periphery holes was 90%. The test results showed that this technology could effectively reduce the blasting vibration under the residential areas in blasting excavation, the effective experiences could be used in the similar projects.
Study on Durability of High Bending Strength Pavement Concrete
Authors: Guo Wei Hong
Published: November 2012

In order to explore the durability of high bending strength pavement concrete, adding silica flour, fibrous reticulum, SD emulsion and HG emulsion separately in concrete mixture, the shrinkage characteristic, wear resistance and fatigue property of different high bending strength pavement concrete are tested, and contrastive analysis with the plain concrete material is researched. The test results show that the early contraction of HBSPC is bigger, but the total drying shrinkage strain is smaller than plain concrete, and the drying shrinkage stable stage of HBSPC is shorter than plain concrete. The temperature shrinkage of HBSPC and plain concrete is uniform basically, the temperature shrinkage coefficient of HBSPC is lower than the plain concrete in the negative warm area and warm area, but it is higher in 0 °C neighbor. The mixtures of the material enhance the wear resistance and fatigue property of concrete.
Construction Technology of Airfield Pavement Gravelly Substructure under Saline Soil Condition
Authors: He Cheng Gang , Li Zan Cheng , Zhang Tao
Published: November 2012

In order to eliminate the harm of salt heaving, the gravelly substructure was used to replace the tradition concrete stabilized grit substructure. And the construction technology was strictly controlled. Finally, the technology is testified by practice to avoid the salt heaving availably.
Protection and Utilization of Soil Seed Bank in Road Construction
Authors: Luo Guo Zhan , Wang Jian , Fu Jin Sheng
Published: November 2012

The importance of protection and utilization of the topsoil as the soil seed bank in road construction and vegetation recovery has not attracted enough attention. Through analysis of topsoil protection and utilization as well as current situation of road vegetation recovery, it is proposed that using the local topsoil resources which containing richful seed bank for road vegetation recovery is very effective. And it is the technical reference for the road vegetation recovery.
Discussion on Overpass Pedestrian System in Downtown Area
Authors: Jiang Ying , Yang Zheng
Published: November 2012

We propose a comprehensive and multi-functional Overpass Pedestrian System to alleviate the serious traffic congestions in metropolitan areas of big cities in China. It is composed with three major parts: switching and connecting part, transportation part and service facility part. Compared with the pedestrian system and foot-bridges in some busy intersections in urban areas, this system is more efficient and human-oriented on separating pedestrian and vehicles. It can not only relieve the traffic congestion but also increase the comfortable level of walking. Differs from average isolated and single-functional foot-bridges, the system provides pedestrians with more pleasant walking experiences, thus increases pedestrians’ willing to use this system.
Stability and Seismic Behavior of Landslide with Deep Overburden Layer in Kala Hydropower Station, China
Authors: Li Zhuo , He Jiang Da , Xie Hong Qiang , Yang Hua Lin
Published: November 2012

Landslide induced by earthquakes is one of serious seismic secondary disasters. For some large-scale landslide as discussed in the study, both rigid limit equilibrium method and dynamic finite element method are applied to comparatively analyze the stability against sliding under typical working conditions, and to reveal dynamic response characteristics. Results show that rainfall and earthquake have significant influences on the stability of landslide mass, and the safety factors under rainfall and seismic conditions do not satisfy relevant specifications. The similar results are obtained by dynamic finite element method, but the safety factors are larger than that of rigid limit equilibrium method. The landslide belongs to thrust load caused landslide, featuring upper tension damage and lower shear damage. Some measures, such as cutting slope and reducing load, shear tunnel, anchor tunnel, are recommended to reinforce the landslide mass.
Finite Element Transient Analysis on the Highway Reflective Crack in Temperature Change
Authors: Yang Shang Yang
Published: November 2012

Temperature change of the semi-rigid base course is one of the reasons of the appearance of the reflective crack. The stress intensity factor of the semi-rigid asphalt pavement is calculated with the finite element method. Sensibility analysis is made on the parameters (modulus, thermal expansion coefficient, thickness) affecting the magnitude of the stress intensity factor. Above all, it is concluded that the graded gravel can reduce the reflective cracking
Shrinkage and Creep of Concrete on the Mechanical Properties of Cable-Stayed Bridge
Authors: Gao Heng Shan , Li Tie Ying
Published: November 2012

In this paper, using the universal finite element analysis software SAP2000 to build a large span cable-stayed bridge with finite element model, using a stepwise analysis finite element method to study the concrete shrinkage and creep efforts on the main beam inner force and deformation, cable tension during the cable-stayed bridge construction process and after the bridge. Research results show that the effects of shrinkage and creep in the finished bridge cannot be ignored, and the results can be used as reference for the design of similar projects.
The Experimental Study on Controlling the Hydration Heat Temperature Field of the Zhenyuling Bridge Pile Caps
Authors: Lin Chun Jiao , Fu Gen Gen , Guo Lei Lei
Published: November 2012

Based on the experimental study into the temperature control scheme for mass concrete pile caps of the Zhenyuling Bridge, this paper did comprehensive research on effective ways to reducing massive concrete temperature caused by hydration heat, and preventing concrete cracks caused by thermal stress. The paper analyzed the effects of cooling pipe, concrete thickness and surface insulation materials on the temperature-stress field of massive concrete. By theoretical analysis and simulation research, the temperature control scheme was developed to guide the construction of massive concrete. Temperature-controlling techniques and precaution measures of early thermal cracks are introduced, which can provide reference to construction similar structure.
Analytical Solution for Vertical Dynamic Response of Railway Simply Supported Beam Bridge under Bidirectional Moving Loads
Authors: Ye Wei , Li Xiao Zhen , Duan Hong , Shan Chun Sheng , Liu Xiao Han
Published: November 2012

In this thesis, the dynamic responses of simply supported beam bridge in a double-line railway under bidirectional moving loads are mainly studied. To study the characteristics of Euler- Bernoulli beam, a train is simplified as a series of concentrated forces with fixed wheelbase.Structural dynamics is used to deduce the analytical expressions of vertical vibration of simply supported beam under bidirectional moving loads. By simulation software MATLAB, the numerical result of the dynamic responses of simply supported beam bridge could be obtained. Then the 48 meters simply supported beam bridge in a high-speed railway is analyzed, the dynamic responses of simply supported beam of bidirectional moving loads with different interarrival times are discussed.Finally, some general laws for the design of double-line railway bridge are gained.
Study on Normal Section Bearing Capacity of Stone Arch Rib Enclosed by Reinforced Concrete
Authors: Zhang Jing , Qian Yong Jiu
Published: November 2012

The mechanical behavior and failure mechanism of stone arch rib enclosed by reinforced concrete under different existed stress state is obtained by the failure test. Normal section bearing capacity effect of different stress states is studied by test results. Then an analytical method considering the influence factors is proposed to count normal section bearing capacity of stone arch rib enclosed by reinforced concrete.
Wudu Bridge - The Structure Stress Numerical Analysis of Triangle Frame Hanging Continuous Beam Combination Bridge
Authors: Zhou Shi Sheng , Li Wen Hua , Chen Xu Dong
Published: November 2012

As the bridge design theory and the construction level improving, the requirements on bridge's appearance and coordination of the landscape around have also became higher and higher in the scenic area. In this paper, we conducted a numerical analysis on structure stress of Wudu bridge at Laibao Road, in Fang Shan district , Beijing, located in the Wu du scenic spot. And we seek to provide the necessary theoretical basis for the bridge design and model selection.
Application of the Influence Line on the Bridge Testing
Authors: Zhang Run Feng , Zhang Xian Min , Qi Chun Xiang
Published: November 2012

In order to discuss the sensibility of influence line on the damage, a two-span continuous beam model is set up using the finite element method in the paper. The two damage positions at the middle span and 1/4 span are considered. And different damage degrees are simulated by the different crack depths. The shearing force and moment at four key positions of the beam are calculated under the moving unit load separately. Results show that the moment influence line at the middle support of the beam is very sensitive to the beam damage, while the moment influence line at other positions and the shearing force influence line at each position are insensitive. In the moment influence line of the beam middle support position, the obvious different values appear at the middle span when damage in the middle span. As damage in the 1/4 span, the obvious different also appear at the damage position, and the difference is increased unconspicuous up to the middle span, and then decreased soon. The conclusion is beneficial to determine the position of damage by means of comparing the moment influence line with that of undamaged bridge. Moreover, the difference value of moment influence line can also be used to estimate the damage degree.
Research on Base Frequency of Simple Supported Beam Footbridge
Authors: Gao Ting Ting , Li Zhe , Shi Yu
Published: November 2012

In China, the section 2.5.4 of《Technical Specifications of Urban Pedestrian Overcrossing and Underpass》CJJ69-95 stipulated: In order to avoiding sympathetic vibration and alleviate pedestrian’s sense of insecurity, the frequency of free vibration in the vertical direction of the upper part of the overcross should not be less than 3Hz[1]. Through discussing the rationality on this stipulation and analysing influencing factors of footbridges’ base frequency and its calculation method, limiting base frequency of simple supported beam footbridge with different span which Suits Chinese were drew up in this paper.
Influencing Factors and Prevention Measures of Erosion Damage for Highway Slope in Loess Area
Authors: Hai Liu , Zhu Xiao Bin
Published: November 2012

In order to weaken the loss of erosion damage for highway slope in loess area, the author analyzes the main factors affecting the erosion and puts forward prevention measures by theoretical analysis and field survey. He also analyzes the process of rainfall erosion destruction by model test, and the main influencing factors including catchment area, slope length, slope, soil parameter and vegetation coverage, etc as well as the effects and characteristics. This thesis puts forward prevention suggestions from the aspects of enhancing drainage and improving the slope protection according to the main influencing factors, and analyzes the project example. The research result is of certain guiding significance for the rainfall disaster prevention of highway slope in the loess area.
The Mitigation Measures of Frequent Earthquake in the Construction of New Rural Area
Authors: Liu Wei , Zhang Xiao Long , Zou Pan
Published: November 2012

Currently, losses throughout the disaster caused by the earthquake in rural areas represent a large proportion of the losses, and the probability of earthquakes occurred in rural areas is much higher than cities. Losses caused by earthquake disasters on rural are mainly the destruction of rural housing, which are about more than 80% per cent of total losses.Based on this, the research of mitigation measures,considering the new building materials and new seismic model,is carried out for the construction of new countryside in earthquake zone.The aim of the research is to strengthen rural areas of the seismic shockproof measures and provide new references to create harmonious security new countryside.
GB ASME & RCCM Analysis of Piping Design Camparison about Class 2 Components
Authors: Bai Wen Ting , Dai Jun Wu
Published: November 2012

Three primary nuclear technique of RCCM, ASME and the GB50267-97 code of China, have the similar classification of nuclear facility in nuclear power plant, including the code class and security class. The class 2 pressure pipeline design clauses in the 3 codes are similar, but are not identical. The earthquake input and the clauses about the class 2 pressure pipeline are compared. The results show that, when use the alternative damping values for response spectra analysis, GB and ASME are somewhat safer than RCCM in level B criteria, RCCM is somewhat safer than GB and ASME in level D criteria. In class 2 piping design code, RCCM stress assessment focuses more on the pressure, the GB and ASME is more focuses on considering the weight and occasional loads, in the lower pressure and the same stress intensification factor conditions, GB and ASME criteria are conservative than RCCM.
Research on the Dynamic Response of Dam under Rare Earthquake through Dynamic Time-History Analysis Method
Authors: He Yun Xiang , Qiang Yue , Li Li
Published: November 2012

With vigorous development of hydroelectric source in west China, the anti-seismic security issue of dam engineering attracted particular attention. This paper presented the principle of dynamic time-history analysis method and established the model with the assistance of finite element method and combined with practical engineering for further analysis on the dynamic response of displacement and stress of dam’s dynamic time-history analysis to the time history. According to the result, it is feasible and necessary to apply the dynamic time-history analysis method to study the anti-seismic performance of the dam. Furthermore, it pointed out the weak part of the dam in anti-seismic function as well as the area concentrated with critical stress, providing reference for future anti-seismic engineering and shock resistance.
Difference Analysis of Loess Seismic Subsidence between In Situ Experiment and Laboratory Test
Authors: Xu Shun Hua , Wang Lan Min , Sun Jun Jie
Published: November 2012

Seismic subsidence of loess is a kind of disaster induced by strong ground motion in loess area, while seldom example of this subsidence was found in long time study, usually instead of laboratory test. An explosion ground motion in a typical loess field was designed to verify seismic subsidence of loess with natural condition and laboratory test of loess seismic subsidence was conducted in China. The result proved seismic subsidence of loess could be induced by explosion ground motion, while the maxmuim settlement of 3.3cm in the case of experiment is much less than 53cm with a moderate or strong dynamic stress in laboratory due to an incomplete seismic subsidence of loess in this field. The seismic subsidence of toper loess layers is less than the below in the field test although it is opposite to in laboratory test due to closer distance between the below layers and explosion shots.
Test Research on Seismic Performance of Beam
Authors: Wan Hai Tao , Yuan Yu Qing
Published: November 2012

Reinforced concrete ( RC) frame structure is one type of building structure which is widely used in China. Damage of some reinforced concrete frame structures under the earthquake is caused by the damage of RC beams, So RC beams are an essential seismic members. The paper introduces the design of RC beam specimen, mechanical properties of materials, production of RC beam specimen, test method, loading device, loading system, the contents of measurement and data acquisition in detail. From the above analysis, it is obvious that the test is the most effective means of studying the seismic performance of beam.
Identification Methods of Important Parameters for Near-Fault Pulse-Type Ground Motions
Authors: Li Ming , Jin Qiao , Liu Yong , Yuan He , Sun Zhe Zhe
Published: November 2012

during the process of fitting or synthesizing near-fault ground motion，parameters of the equivalent velocity pulse need to be decided based on seismic records．Thus, it is a key problem that how to identify these parameters from the records．Pulse period and pulse peak velocity are important parameters in the equivalent velocity pulse models．In this study，various methods on identifying these parameters are reviewed．It is shown that all the existing methods have limitations，especially for the irregular seismic records．Finally，problems need to be further studied is pointed out.
Forecasting Seismic Damage in Frame-Shear Wall Structure Based on Fuzzy Neural Network
Authors: Jiang Wei , Gu Bing Xin
Published: November 2012

The author did numerical experient on the seismic behavior of fram-surpported shear wall structure,then proposed a method of fuzzy neural network forrecast besed on second-time comprehensive evaluation for training and forecast with all these experiment mertiarials.The result shows that this method can forecast the seismic behavior of fram-surpported shear wall structure fairly well, which is avilable to this kind of sructure selection.
Analysis of Using Interlayer Seismic Isolation Technology in Storey-Adding Structure
Authors: Guo Wei , Liu Shao Dong , Liu Jin Yun , Zhang Rong Hua
Published: November 2012

Comparing with direct storey-adding structure, storey-adding isolated structure has different effect to the seismic performance of original structure. By establishing a multi-mass dynamic analysis model of storey-adding isolated structure in which isolation devices were set up, the damping mechanism of storey-adding isolated structure with different amounts of added floors and various frequency of isolation layer was studied. The results show that, with the increasing of added floors, the inter-storey shearing force and inter-storey drift increased more obviously, and the isolation effect is more desirable when the frequency of isolation layer is lower than 50% of the site characteristic frequency.
Scientific Problems on Seismic Resistance of Bridge of Pile Foundation in Liquefiable Site
Authors: Tian Li Hui , Bai Guo Feng , Feng Bin , Wang Li Yuan , Yang De Zhi
Published: November 2012

Aiming at the scientific goals of seismic resistance of bridge of pile foundation in liquefiable site, several scientific key problems were presented. Then, the following were analyzed in detail: Mechanism of large-scale table test on dynamic pile-soil-bridge interaction in liquefiable site; the Pyke’s modified dynamic constitutive model of soil; Kagawa’s p-y relation for analysis of piles lateral resistance behavior, and evaluation of degradation and velocity effect on piles vertical resistance. The results show that quasi-static and dynamic analysis need to be advanced for prediction of dynamic pile-soil-bridge interaction; the continuum media model based on Biot's dynamic coupled theory for two-phase porous media should be further developed; Kagawa’s p-y relation is the better choice for analysis of lateral resistance behavior of piles and should be improved, and liquefaction should be considered when analyzing the influences of degradation effect and velocity effect on the vertical resistance behavior of piles.