bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Study on Major Damage Index Models
Authors: He Li , Ye Xian Guo
Published: October 2012

Base on 8 column test data obtained under low cyclic loading test, our study group conducted a comparative study of the four categories of damage index models. Different damage index models were used to calculate the damage index of the same column, and calculation results show that the different models give quite different result on the same column damage, and corresponding conclusions of the study are presented on this basis.
Implementation of Data Record Simultaneously in Seismic PSD Test
Authors: Guo Xin , Bai Guo Liang , Sun Peng
Published: October 2012

Civil experimental system consists of electric-hydraulic servo-controlled testing machine and the data logger in which the recorded data are saved. In Electro-hydraulic servo controller, a exterior trigger signal is used to remote control the data logger working, and the problem of data record synchronously is solved in on-line processing of servo testing machine and data logger, which quicken the test speed by making program calculation and command control simultaneously. The case based on digital command control for pseudo-dynamic on-line test for hybrid structure of thermal power plant is described, by which the data record simultaneously in pseudo-dynamic test achieved automatically. The research provides important reference value for the same type of on-line experiment.
The Kinetic Performance of High Pier under Seismic Load
Authors: Liu Hai Tao
Published: October 2012

With the rapid development of national transportation, many bridges with higher and higher piers crossing sea and clough are constructed. The p-delta effect of tall piers in bridge is so evident that can not be ignored to assure the absolute safety of bridge. Research shows that, in comparison with other ways, energy analysis was simple and versatile for different load combinations in computing upper pier displacement, and neglecting p-delta effect often underestimated the disadvantageous state when the pier is high.
Parametric Reliability Analysis of the Seismic Bearing Capacity of Bottom Columns in Reinforced Concrete Frame Structure
Authors: Jiang You Bao , Zhao Yu Lai , Yang Wei Jun , Gong Zhi Ling
Published: October 2012

After the Wenchuan earthquake, Chinese Code for Seismic Design of Buildings (GB50011-2010) adjusts some seismic design parameters. Taking into account the randomness of gravity load and earthquake action and the uncertainty of steel strength and concrete strength, this paper analyzes the reliability of seismic bearing capacity of reinforced concrete frame bottom columns. Based on the structural analysis software PKPM, which is in accordance with code for seismic design of buildings, the reliability index of seismic bearing capacity of reinforced concrete frame bottom columns is calculated by the Monte Carlo method with different parameters, such as different seismic intensity, different building storey number, different seismic adjustment coefficient (increment coefficient of frame columns end moment and increment coefficient of design value of combination moment of underlying frame columns lower end section), different horizontal span number, different column location (side column and interior column) and so on. The results indicate that the reliability index can reach 2.0 or above, and can meet the target requirements for all cases which are designed with the current code for seismic design of buildings (GB50011-2010).
Identification of Multi-Axial Seismic Loadings from Several Structural Dynamic Responses
Authors: Zhang Kun , Li Hui , Duan Zhong Dong , Law Siu Seong
Published: October 2012

A new method is proposed to identify multi-axial seismic loadings from structural dynamic responses on limited degrees of freedom. The seismic loadings acting on structures are modeled by Hartley series approximation, and the sensitivities of structural dynamic response with respect to the unknown approximation coefficients are derived. The identification equation is set up based on best fitting structural measured and calculated responses, and is solved with the damped least-squares method. A five-story three-dimensional steel frame structure excited by El-Centro seismic accelerations is studied for validating the proposed method. Numerical simulations with measurement noise and model errors show that the proposed method can accurately identify all seismic loadings from only several responses of the structure.
Decision-Making Model for Ranking Earthquake Emergency Events Based on Intuitionistic Fuzzy Sets
Authors: Wang Feng Shan , Wu Li Fa , Rong Quan Bing , Zhang Hong Jun
Published: October 2012

To ravel out the difficulty in the expression and measurement of Non-subjected Information in earthquake emergency decision-making under fuzzy environmental conditions, a ranking method was put forward for earthquake emergency events on Intuitionistic Fuzzy Sets. Via the explanation about the concept of Intuitionistic Fuzzy Sets, intuitionistic fuzzy matrix and its interval estimation was established for the set of the earthquake emergency events, and the positive and negative ideal intuitionistic fuzzy earthquake emergency was determined; Through defining the distance calculation about subjected, non-subjected and hesitated degree, and respectively comparing the distance from the emergency to the positive and negative ideal event, the superiority degree model was established for the earthquake emergency events, which further gained the sequence of the emergency event collection. Case showed that model effectively solved the ranking problem about earthquake emergency events, which provided one theory and method for scientific decision-making practice in shock resistance and disaster relief.
The Principle and Idea on Reducing Earthquake Disasters Using Light Reinforced Soil
Authors: Hou Tian Shun , Wang Wei , Yang Xiu Juan , Ouyang Hui
Published: October 2012

In order to reduce the hazards of earthquake disasters on human, basic principle of reducing vibration is discussed by establishing passive vibration isolation model. The calculation results show vibration can be reduced by isolation materials whose deformation modulus (stiffness) should be smaller and damping should be appropriate. Light reinforced soil is a good man-made material, its all physical mechanical parameters can be changed, and anti-pull capacity of soil can be increased. According to the basic principle of reducing vibration, reducing vibration idea using light reinforced soil is brought forward, and the idea has a very important significance for research on reducing earthquake disasters from the angle of ground and foundation.
Earthquake Disaster Prediction of Multi-Story Masonry Building in Yinchuan City
Authors: Tang Shao Rong
Published: October 2012

With the increasing importance of urban disaster prevention, the earthquake disaster prediction has gained more and more attention. Based on the investigation data of one multi-story masonry building in Yinchuan City, which located in the North-South seismic belt of China, the earthquake disaster prediction has been done by using of vulnerability analysis.
Seismic Behavior Analysis of Bank Intake Tower Structure
Authors: Zhao Hai Tao , Yue Chun Wei , Wang Yi , Luo Yong Jun
Published: October 2012

The intake tower of the hydropower station is a high-rise underwater hydraulic building whose seismic safety is enormously important. Taking the effect of foundation and hydrodynamic pressure into account, we apply the ANSYS for the static and dynamic analysis which evaluate the seismic behavior of the intake tower. The result which provides the basis for the improvements shows that the rigidity of intake tower meets the requirement. After taking some engineering reinforcement measures, the strength also meets the requirement.
Seismic Damage Analysis for Multi-Story Masonry Building with R. C. Frames on Ground Floor
Authors: Wang Duo Zhi , Dai Jun Wu , Zhang Chen Xiao
Published: October 2012

Multi-story Masonry Building with R. C. Frames on Ground Floor (Framed-Ground Floor Structure for short) which has serious seismic damage and high collapsed rate, is the unreasonable structure system. However, the structure system not be abolished for economic reason. Collapse types of that are divided into collapse of ground floor, collapse of transition layer, global collapse. And seismic damage is also serious for frame column and shear wall. Experiences are obtained from above seismic damage, and the following aspects should be taken into account in the future. 1. The shear wall can be increased to improve stiffness of weak layer. And designer should try to arrange the walls equably. 2. In order to avoid stiffness mutation, stiffness ratio between ground frame and transition layer can be adjusted. 3. Collapse resistant design of Framed-Ground Floor Structures should be emphasized.
Seismic Response Analysis of Pile-Soil Interaction in Super High-Rise Building
Authors: Zhang Ya Nan , Jiang Xin Liang , Yan Wei
Published: October 2012

Based on the soil-structure interaction theory and finite element method, this paper analysis the seismic response of pile-soil interaction system in super high-rise building. This paper established a structure- pile-soil finite element mole of a super high-rise building in Tianjin area and analysis the dynamic response of superstructure and the internal force and displacement of the pile considering the influence of pile’s slenderness ratio. The results show that, the displacement and acceleration of the top of interaction model are increased compared with the fixed base model. Under seismic excitation, the peak displacement and the peak acceleration of pile top are larger than the pile bottom. As the pile’s slenderness ratio is larger, the inter force and displacement seismic response of the pile is larger and the variation of peak is bigger along the pile.
Seismic Behavior of Composite High-Rise Buildings with SRC Column, Steel Beam and RC Core Tube
Authors: Zhao Bin , He Juan
Published: October 2012

In this research, a reduced scale model of the composite high-rise building with steel reinforced concrete column, steel beam and reinforced concrete core tube was designed and tested by using the shake table test technology. The acceleration and displacement of the model were measured during the tests. The cracking pattern and failure mechanism were illustrated. Above the shake table test, the finite element analysis of the test mode was carried out. The main effort of the numerical analysis was focused on the selection of the nonlinear models. Based on the experiment results and the strategy of considering nonlinear property of the beam-column joint and the short beam of the concrete core wall were proposed. It is proved that the proposed strategy is effective and economical for seismic behavior assessment of such composite high-rise building structure system.
System of Groundwater Flow in Multilayer Pore-Fissure Media with Weak Permeability Layer
Authors: Deng Ying Er , Jiang Huan Huan , Yu Jing
Published: October 2012

Groundwater in pores and fractures of rock can result in destruction of a reservoir dam. Therefore, techniques of forecasting characteristics of groundwater flow have wide applications in areas of hydraulic engineering. A consecutive experiment was designed and combined with analyses of groundwater chemistry to solve a groundwater hydrology problem in multilayer pore-fissure media with weak permeability layer occurring in hydraulic engineering construction in China. Results show that changes of electrical conductivity of groundwater samples from wells, springs and drillings with time have a good relevance except a sample in local position with very weak permeability layer; and that a system and pathways of groundwater flow in multilayer pore-fissure rock with weak permeability media can be determined by the method of a consecutive test combined with groundwater chemistry analyses.
Study on Seismic Performance of Symmetrical Steel Framed Building that with and without ERB and FPS Isolators
Authors: Xia Dong Zhou
Published: October 2012

As is known, base isolation can reduce earthquake energy that transferred from the ground motion to the structure by buffering it with a bearing layer at the foundation which has relatively low horizontal stiffness. The paper investigates the time history records of a two storied symmetrical steel framed isolated building with Elastomeric Rubber Bearing and Friction Pendulum Systems that under the Northridge earthquake, and the isolator parameters are calculated using the design guidelines of International Building Code (IBC2000) within the spirit of IS 1893–2002(7). And then, contrasting of the roof’s displacements, accelerations and base shear values of the steel framed building with and without isolators, and which studied from the Non-linear time history analysis using structural analysis software SAP2000. The results show that base isolation will provide a substitute technology for the conventional, fixed-base design of structures and cost-effective for new buildings in high seismic regions.
The Ultimate Seismic Capacity Research of Concrete Gravity Dam Considering the Initial Crack
Authors: Yu Pei Si , Wang Wei Qiang
Published: October 2012

Based on the typical overflow dam section of Ahai gravity dam, the cracking calculation was conducted and the crack form was determined, referring to the experimental research result. Then the constraint-function contact algorithm in ADINA was used to study the stability of the upper free body subjected to an earthquake. The analysis results primarily show that the ultimate seismic capacity of Ahai gravity dam is an earthquake whose peak acceleration is between 3.4g and 3.8g.
Calculating Size Limitations of Non-Load-Bearing Walls under Seismic Loads
Authors: Yang Chun Xia , Liu Qing Qing , Sun Li Juan , Liang Jian Guo
Published: October 2012

Infill walls,etc. non-load-bearing walls are vulnerable to fracture when these are subjected to out-of-plane seismic loads. Studies suggest that the overall dimensions of non-load-bearing walls are the important parameters to affect its out-of-plane mechanical properties, but most of these researches are qualitative researches, do not give specific size limitations. This paper based on codes has calculated out-of-plane loads of non-load-bearing walls, then bearing capacity check formulas have been deduced when non-load-bearing walls are subjected to out-of-plane seismic loads, finally the size limitations used in the height-thickness ratio check and seismic check are obtained.The conclusions fill up gaps in research of non-load-bearing walls ,and provide reference for the design specifications of non-load-bearing walls.
Determination of Spacing between Anchored Piles in Row for Deep Foundation Pit
Authors: Du Guang Qian , Wang Shi Jie , Qin Yan Ting , Zhu Chang Zhi
Published: October 2012

Based on the pile - anchor structure soil between piles,the unified strength theory is introdued in the strength analysis of soil arching between the piles, and parabolic soil arching computational model is uniformly distributed loads ,which are given to meet the soil between piles arch static equilibrium conditions and intensity of conditions , pile spacing formula. Compared with calculations based on the pile spacing of the Mohr-Coulomb strength criterion , the proposed method can consider the contribution of the intermediate principal stress on the strength of the soil arch , the results are more in line with the actual characters of the supporting structure .
A Development of 3-Dimensional Coordinates Monitoring System for Underground Pipeline Using IMU Sensor
Authors: Cho Sung Ho , Lee Eun Soo
Published: October 2012

The three-dimensional coordinates monitoring system to underground pipeline using IMU (Inertial Measurement Unit) sensing technique was developed. Three-dimensional coordinates obtained from the developed system were compared with three-dimensional coordinates obtained from using total stations and levels. when compared with the results, maximum error of the horizontal and vertical positions were 7cm ,14cm respectively. In our Country, tolerance error of underground utility surveying is ± 30cm. Therefore, the developed system is expected to be utilized the underground pipeline location surveying .
The Development History and its Research Status of the Technology of Ground Penetrating Radar
Authors: Yang Lei
Published: October 2012

This essay presents the development history, field of application, research status, and its main products of the technology of ground penetrating radar, and it also discusses the major issues that be faced with by the technology of ground penetrating radar as well as its development direction in the future.
New Technology for Field Survey of Traditional Settlements
Authors: Song Ying , Li Zhe , Li Yan
Published: October 2012

Field survey provides data for further research and is a key link in research on traditional settlements and other architectural heritage. However, due to the complexity of the landform, layout, orientation of buildings, forms and structures of traditional settlements, mapping and other fieldwork may take much time and efforts and are very difficult. Besides, satellite remote sensing data are few. Therefore it is necessary to introduce some advanced equipment and technology for spatial information acquisition. Through years of experiments with aerial and ground-based equipments, the author finds that small unmanned helicopter, with its multi-functional spatial information acquisition capacity, is the best choice for the research of traditional settlements and other related fields.
GPS Level Fitting Algorithm
Authors: Liu Mao Hua , Yin Xiao , Sun Xui Bo
Published: October 2012

The paper elaborates the principle of the GPS leveling and conventional secondary surface fitting method. It introduces dynamic weighted fitting method and MATLAB V4 interpolation fitting method. Finally, using an example, the paper makes the comparison and gets some practical significance conclusions: conventional secondary surface fitting method can be used if the area is small and its terrain is simple; the area's terrain is flat, it can use V4 interpolation and When the area's terrain is fluctuated, it can use dynamic weighted fitting method.
Monitoring Measurement of Vehicular Tunnels and Finite Element Numerical Simulation Analysis
Authors: Chen Lei , Wang Lei , Zhang Lin
Published: October 2012

The vault settlement, the horizontal convergence of Fangdoushan tunnel are monitored and measured. The changing curves with time are drawn; while the data of convergence measurement is analyzed with linear regression. The whole constructing process is simulated to analyze based on FLAC3D. The results of comparative analysis of the data from field monitoring and the data from numerical simulation shows that the simulation results accord well with the actual monitoring data, which will furthermore optimize both the design and the scientific construction
Assessment of Load Carrying Capacity for Concrete Rectangle Section Simple Beam Subjected to Fire
Authors: Zhang Gang , He Shuan Hai , Guo Hong Jun
Published: October 2012

The assessment method of load carrying capacity for concrete rectangle section simple beam subjected to fire was presented. Comprehensively considering influencing parameters, load carrying capacity for reinforced concrete rectangle section simple beam was analyzed in a fire hazard by using numerical simulation program. A series of safety assessment regularities for the reinforcement pieces was put forward subjected to fire. The studied results indicate that: the ultimate moment for reinforcement concrete beam bridge tends to decrease linearly after 40 minute, the fire resistance of the reinforcement concrete rectangle section simple beam increase linearly with the increment of the concrete cover thickness; Therefore, the increment of concrete protective thickness is effective to fire resistance and safety grade for the reinforcement concrete beam.
Analysis on the Energy Dissipation of the Composite Isolated Structure under the Near-Field Multi Pulse Ground Motion
Authors: Li Hui , Liu Di , Du Yong Feng
Published: October 2012

In this paper, the near-field multi pulse earthquake wave is generated by means of combining the velocity pulse component and the broad-band component based on studying the characteristics of the near-field ground motion.. Then, have made a numerical analysis on the composite isolated structure’s dynamic response as well as a quantitative analysis towards its energy dissipation with the help of the energy equation. Study shows, by comprehensively making good use of the energy dissipation characteristic of the laminated rubber bearing and the viscous damper, the viscous damper can perfectly find its way of taking its energy dissipation advantage, thus , to reduce the displacement of the isolation layer, and then improve the force state of the structure , accordingly decrease the damage to the upper structure. All in all, it has made a great contribution to improving the security of the structure under the near-field multi pulse earthquake.
Experimental Study on the Axial Loading Tests of RC Columns Strengthened with Steel Tube
Authors: Zhou Miao , Li Jian Wei , Duan Jing Min
Published: October 2012

This paper carries out a series of experimental study on 6 column specimens, analyses and compares with the different parameters on the axial loading tests of RC columns and RC columns strengthened with steel tube. The experimental results show that the RC columns strengthened with steel tube take full advantage of loading properties of both materials, thus greatly improve the bearing capacity of specimens. With the same wall thickness steel tube, the improving degree of bearing capacity of long columns is bigger than the short columns, and the reinforcement effect is more obvious. The experimental results can offer reference for scientific research and engineering staff, and promote this reinforcement method to be widely used in engineering practice.
Cyclic Testing of Bolted Flange Plate and Double Split Tee Type Weak-Axis Steel Moment Connections
Authors: Lee Kang Min , Li Rui , Chen Liu Yi
Published: October 2012

Steel beam-to-column connections are very important for steel moment-frame structures. Beam-to-column connections have a great influence not only on the seismic performance but also on construction costs and construction durations. These days in Korea, most of the connection details are comprised of the column-tree type beam-to-column connections due to the Japanese influence. But this type of connection is inefficient when it comes to transportation and requires numerous components. The Bolted Flange Plate(BFP) and the Double Split Tee(DST) type weak-axis connections on the other hand are simple in construction and the load transfer is more direct. So, in order to research their respective seismic performance, this paper prepared two specimens and conducted a full-scale test. The study obtained the story drift ratio curves and the total plastic rotation curves of the specimens. Through the analysis of the curves this paper aims to conclude that the two connections meet the requirements pertaining to the Special Moment Frame, which prescribes that the story drift ratio should reach 4%. This paper demonstrates that the BFP and DST type connections display good plastic behaviors.
Ecological Farm Masonry Structure Detection & Appraisal in Sichuan Emei
Authors: Fu Peng Bin , Nie Kun , Gao Yong Tao
Published: October 2012

Using penetration resistance methods detect the wall’s mortar strength to masonry structure where in ecological farm of Sichuan Emei, and then obtain the date of field trial. We have calculated the mortar actual strength according technical specification for testing compressive strength of masonry mortar by penetration resistance method, and compare the calculated results with compression tests result, testing specimen from the engineering project field. So we obtain true mortar strength of engineering and corresponding appraisal conclusion.
Application of the Fuzzy Analytic Hierarchy Process in Pipeline Risk Factor Weight
Authors: Cai Liang Jun , Zhang Wei Jun
Published: October 2012

With the characteristics analysis of city gas pipeline risk as a foundation, there were many uncertainty factors in gas pipeline risk assessment, the existing risk assessment methods affected assessment results due to its own limitations. The model introduce fuzzy analytic hierarchy process, utilizing its strict logic and comparative principle, the risk factor weight of pipeline were resolved in a good solution, effectively reduce the artificial subjective, greater error and lower quantitative in the existing risk assessment methods. This method is showed through the example in city natural-gas pipeline risk assessment serviceability and reliability.
Study on Hybrid Control Method of Mega-Sub Controlled Structure Subjected to Seismic Action
Authors: Xia Dong Zhou
Published: October 2012

A new structural configuration that named Mega-sub controlled structure (MSCS) is presented in the process of tall buildings, super tall buildings and super tall tower construction. To further improve the structural control effectiveness of MSCS, new hybrid control method which employs active control and adjusts the stiffness of substructure is proposed. At the same time, the control law and dynamic equation are presented that assembling parameter matrixes for the MSCS subjected to horizontal seismic excitation. Then, the influence of adjusting structure parameter and active control parameter on control effectiveness, dynamic characteristic and control force of the MSCS under hybrid control is discussed. Results indicate that, the new hybrid control method proposed in the paper has the ability to develop a high level of response control effectiveness when subjected to seismic action, and a much better control effectiveness will be obtained after parameters optimization.
Crack Resistance Capacity Analysis of SRC Column-RC Beam Node
Authors: Yuan Bo , Zeng Ming Hui , Ma Ke Jian
Published: October 2012

It is very important for connection of between beam and column, connection safety and reliability is premise to guarantee the normal work of the whole structure. Node often bears complex stress which includes compression, bending and shear, so the study of the mechanical properties and ascertained behavior of mechanical, failure mechanism of between beam and column is very important. This paper use finite element analysis software to analyze the node of between SRC column and RC beam which exist in high-rise buildings but relatively few researches at present. Analyzed cracking load-displacement relation and studied on relation of concrete shear strain-section steel wing shear strain and crack load of joint core with different axial compression ratio, According to data of finite element analysis, this paper bring forward formula of crack resistance capacity of SRC column-RC beam joint core, At last compare theory value calculated with formula with test data, there being less error, it indicate the formula is reliable.
The Distribution Laws of Interlayer-Gliding Structure Controlled by Panji Anticline and the Research of Quantitative Evaluation in Seams
Authors: Le Qi Lang
Published: October 2012

Based on the research of interlayer-gliding structures in Panbei and Panji No.1 coal mine that are located in the each wing of Panji anticline, the Panji mining area is divided into 9 main interlayer-gliding areas and 29 sub-regions. The results indicate that the interlayer-gliding structures mainly developed in the anticline wings, which show obvious symmetry at the type and distribution. The types of the interlayer-gliding structures are fault-sliding and corrugation type in the wings and fracture type in the core area. The type and manifestation of the interlayer-gliding structures also show symmetry in the similar depth. From up to down, the interlayer-gliding type show obvious regularity that fracture type is mainly developed in the shallow area, down is fault-sliding type and corrugation type is mainly developed in the deep or the interchange of the faults. Take fuzzy comprehensive evaluation method to evaluate the inter-gliding structure in west area of Panji No.1 coal mine. The results showed that the results from using fuzzy comprehensive assessment were similar with the results exposed by coal mine. Good effects were obtained for predicting the development intensity of the seam-gliding structure in deep unmined areas in combination with geological conditions of coal mine, providing references for production arrangement of coal mine.
Application of Virtual Crack Close Technique in the Static Crack Growth Based on Strain Energy Release Rate Criterion
Authors: Cheng Chen , Wan Shui , Jang Zhen Wen
Published: October 2012

A method to simulate the crack growth, according to the strain energy release rate criterion, with the virtual crack close technique, is studied. The virtual crack close technique is used to calculate the strain energy release rate. To achieve the virtual crack close technique, in the FEA software of ANSYS, COMBIN14 spring elements are adopted to set up the finite element model. Then this method to simulate the crack growth is validated by three crack growth problems. This method is a useful and accurate numerical simulation method.
Numerical Simulation of Soil-Structure Dynamic Interaction System under Blasting Load
Authors: Gao Wen Le , Huang Bo , Wang Chen
Published: October 2012

Soil-Structure Dynamic Interaction (SSDI) is an important content of earthquake engineering and earthquake resistance of engineering structures. However, very few researches have been done on Pile-Soil-Structure Interaction (PSSI) under blasting vibration so far. In this paper, large finite element software ANSYS/LS-DYNA is used to simulate PSSI under blasting vibration. Research shows that the top displacement, acceleration and shear stress of piles are larger than the tip of piles, and the distribution laws are inverted triangles. What’s more, PSSI system sustains its vibration after the impact of blasting seismic waves, but the effect of the vibration is smaller than the blasting seismic waves does, which roughly conform to the measured results. These conclusions could provide theory basis for earthquake resistance of engineering structures and design of pile foundation.
Finite Element Analysis of the Corrosion Prestressed Concrete Beam
Authors: Zou Hong Bo , Luo Xiao Yong
Published: October 2012

Based on analysis of the Corrosion prestressed concrete beam with finite element model, the paper presents the mechanical performance of concrete beams in different corrosion rates. When the corrosion rate is less than 5%, the strand corrosion has little impact on the load capacity. With the increase of the corrosion rate more than 5%, what damage happened to Beam is little steel damage and brittle damage even without apparent warning and at the same time the Corrosion of steel strand will cause the decrease of the ultimate load capacity with the deterioration of ductility.
Basic Discussing on Constructive Faults of Mortar Masonry Retaining Wall and Their Prevention Measures
Authors: Wang Bing , Liu Hai Long , Ren Hong Peng
Published: October 2012

According to engineering analysis on the performance and the causes of constructive faults of mortar masonry retaining wall , such as drain hole losing effectiveness, settlement joints out of plumb, mortar of pointing falling off and surface’s unevenness, and their prevention measures are summarized.
Analysis of Dynamic Stability for Composite Laminated Beam with Delamination
Authors: Yang Jin Hua , Chen De Liang , Ning Ming Zhe
Published: October 2012

Abstract. By introducing the Heaviside step function into assumed displacement components and using the Rayleigh-Ritz method for minimizing the total potential energy, a set of dynamic governing equations for the delaminated beam is derived. Then, the dynamic governing equations are written as the Mathieu-type equations to describe the parametric vibrating behavior of the beam, and these equations are solved by employing the Bolotin’s method. Numerical results in dynamic stability of laminated beam with delamination are presented, and the effects of static loading, delamination length and material property on the principal dynamic instability region of the laminated beam are discussed. Present results are compared with available data.
The Stability Analysis of Tailings Dam under the Fluid-Solid Coupled Interaction
Authors: Yang Kun , Han Hao , Ma Zhi Chao
Published: October 2012

Numerical simulation method is adopted to analysis the stability of tailings dam under the fluid-solid coupled interaction. Using the full-coupled analysis function, stress field 、seepage field and their coupled model are studied in this paper. Finally, the critical sliding surface of the tailings dam is searched. Results show that the safety factor after coupling is smaller than before. It illustrates that the fluid-solid coupling analysis has an important practical significance for the stability analysis of tailings dam.
The Technique of Deep Foundation Pit and Pile Foundation Construction
Authors: Li Rui , Qiao Yi , Liu Yong Jie
Published: October 2012

As the population growth and land resources declining, high-rise building project is increasingly common in the construction work. Through in-depth thinking and active exploration, specific attention to matters of deep foundation pit and pile foundation construction technique, which is the key construction techniques in the high-rise building project, was summarized in this article. It suggests to make a careful and detailed geological survey, and then choose the right design program and develop a reliable construction plans. This scheme was proved to be a useful reference and guidance for the development of high-rise building construction technology.
Application of Pressure Grouting for Crack Strengthening in Sanqing Hall
Authors: Ye Jian Hua
Published: October 2012

As one of the common hazards to buildings, cracks will directly affect the bearing capacity and life of the structure. The pressure grouting introduced to the restoration project of Sanqing Hall of Huixian Taoist Temple has been proved efficient with character of simple and speedy execution and effective crack strengthening.
Effect of Local Concrete Strength Decline on High Piers' Nonlinear Stability
Authors: Xiao Yong Gang , Liu Yu Jun
Published: October 2012

The nonlinear stability of three main piers of Xiniu bridge was analysed with RM Bridge V8i in this paper. The change of high pier’s nonlinear stability with the strength decline of high pier’s local concrete and variation of high pier’s height were also respectively researched.The results show that nonlinear stability coefficients will be lower if one segment of high pier’s concrete strength declines. It also indicate that the nonlinear stability coefficients drop is related to the decrease of the concrete strength, the distance between the segment at the bottom of pier, and the height of pier.
Fracture Mechanism of Joints of Steel Box Column-H Steel Beam and Performance Study of Joints Strengthened with Haunches
Authors: Tang Qian Zhen , Wang Wan Zhen , Zhao Xin , Shi Hang Lei , Peng Chen
Published: October 2012

Fracture test was performed on conventional joint of steel box column-H steel beam. The test results indicate that the conventional joints brittle fracture at butt weld of beam flanges. The performance of joints of steel box column-H steel beam strengthened with haunches is numerically simulated based on an ellipsoidal fracture model considering of welding residual stress and welding defects. The simulated results show that, for the joints of box column-H beam strengthened with haunches, the plastic rotation of could reach 0.03rad and the bearing capacity increased by 20% compared with that of the conventional joint.
Stability Analysis of High Filling Slope Effected by Precipitation Duration
Authors: Liu Zeng Rong , Luo Shao Feng
Published: October 2012

Aiming at researching on stability of high filling slope effected by precipitation duration. Transient saturated-unsaturated seepage method and slope stability finite element method is combined in this paper. Vadose field of slope is simulated in different precipitation duration condition. On the basis of vadose field author analyses the stability of slope effected by precipitation duration. The research results indicate that change of the pore water pressure is mainly concentrated in the position where the water level changes in the process of precipitation. After the precipitation pore water pressure gradually dissipates. Precipitation duration has great effect on the slope stability. With the precipitation duration increases the slope safety coefficient decreases. The slope safety coefficient decreases in the process of precipitation, but after precipitation, it increases gradually and eventually be more stable. The longer the precipitation duration is, the longer time that the safety coefficient reaches the ultimate stability required.
ANN-Based Structure Optimization with Fatigue Reliability Constrains
Authors: Sha Li Rong , Yang Yue
Published: October 2012

The ANN-based optimization for considering fatigue reliability requirements in structural optimization was proposed. The ANN-based response surface method was employed for performing fatigue reliability analysis. The fatigue reliability requirements were considered as constraints while the weight as the objective function, the ANN model was adopted to establish the relationship between the fatigue reliability and geometry dimension of the structure, the optimal results of the structure with a minimum weight was reached.
Strength and Stability Analysis on Storage Silo of Concrete Mixing Plant
Authors: Zhou Xin Xiang , Tang Yan Ling , Liu Cheng , Hu Guang Yu
Published: October 2012

This paper takes the under-frame of 300t storage silo produced by a certain company as the main research subject,static behavior of the under-frame is analyzed by three-dimension finite element method to generalize the rule of static deformation and stress distribution.Eigenvalues can be obtained by stability analysis and global stability and the whole structure is checked.All of the above provide a reliable reference for the design of storage silo.
A Study on the Crack Propagation Process in Concrete Structures Using Energy Method
Authors: Hu Shao Wei , Mi Zheng Xiang , Lu Jun
Published: October 2012

The mechanical performance of concrete structures closely relates to the propagation of cracks. Depth studying energy dissipation of concrete in fracture process zone not only contributes to comprehensive understanding fracture failure mechanism of concrete, but also has significant in detecting and forecasting the cracks in actual structure. In view of this, a general equation for calculating at any time’s mean energy dissipation per unit length was given. After that, we further simplified and deduced the general equation and got a simple, practical and high accuracy numerical solution, with which Gauss integration method was used. At last, the specific steps of calculating mean energy dissipation were given by taking 10 three-point bending beams of different crack-depth ratios for an example. Compared with test dates, we found that calculated results are in good agreement with the test dates. According to results, influence of crack-depth ratio on the fracture energy was also discussed.
Research on Temperature Field of CFST Member under Solar Radiation
Authors: Fan Jun Ling , Zheng Hong Cai , Zhang Qian , Ding Man , He Yan
Published: October 2012

This study concerns the experimental and numerical researches on the temperature field of CFST which is subjected to periodic solar radiation and ambient temperature. The study gives the detailed temperature and heat flux which vary with time, and the results indicate that temperature distribution caused by solar radiation is nonlinear, and is significantly varied with time and sections. The peak temperature of measure points in the surface of steel tube and in the center of concrete occur at different times, the largest temperature difference is over26.3°C. The variations of temperature lag obviously when the measuring points are more close to center in the same series. And the temperature of the center point is affected by various directions, especially the strongest direction.
Comparative Analysis of AE Signals from Damage Processes of Concrete Using Different Sensors
Authors: Wang Yan , Xu Zheng Zheng , Wang Yao , Lu Gui Juan , Zhao Hai Tao
Published: October 2012

Choosing appropriate acoustic emission (AE) sensors is crucial for the research of concrete damage failure processes using AE technology. In this paper, concrete testing under axial tension and compression is used as the main research method, and the choices of AE sensors in monitoring the fracture process of concrete are studied using digital parameters-waveform AE acquire system and four different types of AE sensors. The result showed that the broadband sensor received more signals and their frequency is wider, Broadband sensor shows certain technical advantage in monitoring the damage process of concrete under different stress conditions, embodied as collecting wider frequency range of AE signal, especially the high frequency produced in the anaphase of loading.
Ant Colony Algorithm and Application in Inspection of Concrete Structure Defects
Authors: Zheng Wei Hua , Wang Zong Hua
Published: October 2012

BP neural network detecting concrete defect, convergence is slower and accuracy is not high. In order to overcome the defect of BP algorithm, using a combination of Ant Colony optimization algorithm and BP neural network method, a mathematical model of Ant Colony neural network was established, enables Ant Colony neural network training, and verify the validity of the method. And concluded: using ant Colony neural network identification of concrete defects, the identification of the location more effective than on size.
Classification of Durability of Concrete Structures Based on Environmental Action
Authors: Zhang Ke Bo , Yan Yun Li
Published: October 2012

In order to supply basic principles for durability design of concrete structures, the corrosion mechanism of concrete structures under common atmospheric environment was analyzed. The climatic condition of temperature (T) and relative humidity (RH) which has important impacts on concrete carbonation, was chosen as main factors to grade. On the basis of partition for the influence degrees of temperature and relative humidity on the concrete carbonation, the environmental action in concrete structures was classified with a comprehensive evaluation method. The results show that both temperature and relative humidity can be partitioned into five grades. The concrete carbonation is classified into five grades according to influencing factors of temperature and relative humidity to concrete carbonation levels. The carbonation depth which is calculated with the average of positive temperature and relative humidity is taken as the control index of classification.
Study on Damage Patterns of Corroded High Performance Concrete Column Under Large Eccentric Loading
Authors: Sun Fu Xue , Zhu Yun Hui
Published: October 2012

Through accelerated method using external current and 5% Nacl solution, different corrosion results of rebars in columns were attained to study damage patterns of columns under large eccentric loading. Results indicated that columns with different corrosion degree due to different corrosion time developed defferent damage modes. Firstly, results show typically large eccentric damage for columns with different corrosion degree. Secondly, with the increase of corrosion degree, different damage patterns appear under lower loading including reduction of compressive damage scope, expansion of crack zone and earlier crack. These results can be considered as reference to guarantee safety of structures with eccentric loading under corrosion environment.
Shaking Table Tests on Chinese Ancient Tenon-Mortise Structure Strengthened by Steel Components
Authors: Zhou Qian , Yan Wei Ming
Published: October 2012

In order to protect Chinese ancient building, steel components were considered to strengthen its tenon-mortise joints and the strengthening effects were studied by shaking table tests.Based on actual sizes of an ancient building,a wooden frame model with a scale of 1:8 of the prototype structure was built considering Yan-wei type of tenon-mortise connections.Steel components were used to strengthen tenon-mortise joints of the model to enhance its stability.By white noise excitation values of basic frequency for model in both strengthened and unstrengthened conditions were obtained;By inputing El-Centro earthquake waves of different peak acceleration values,responses of displacement and acceleration for typical nodes of the model were obtained.Results show that after its tenon-mortise joints are strengthened by steel components, basic frequency of the model increases;Under earthquake the strengthened model responds with smaller peak displacement and acceleration values;With the increase of earthquake intensity,the steel components tend to perform better.Thus the steel components are effective for strengthening tenon-mortise joints of Chinese ancient buildings.
A Space-Time-Dependant Design Method and the Stability of Ice Wall for Deep Shafts
Authors: Chen Xiang Sheng
Published: October 2012

The mechanical properties of artificial frozen soils are the key for application of artificial ground freezing, (AGF) especially the creep characteristics of artificial frozen clay when a deep shaft is sunk by using AGF. Many catastrophic accidents took place in clay strata in deep freezing shafts past because of freezing tube breaking and flooding through ice wall caused by large creep deformation of ice wall. A new creep constitutive equation with separated variables for artificial frozen clay, after C. C. Vialov, is presented on base of testing data of most kinds of artificial frozen clay under the condition of drained system. On base of the new equation, a space-time- dependant design method, a modified C. C. Vialov’s, is proposed and has been successfully used for ice wall of deep shafts all over China since 1996. Finally, the stability of ice wall for deep shafts can economically and efficiently be controlled by adjusting the variables of temperature T, un-supported height h and time elapsed t according to their sensitivity or influence.
Shear Strength Change of Different Water Content after Thawing Remolded Soil
Authors: Jiang Wei , Gu Bing Xin
Published: October 2012

Freeze-thaw made the microstructure of the soil produce a certain degree of damage, which was relevant with the soil water content. 6 kinds of remolded soil of the water content was prepared, at low temperature of freezed, in room temperature of melt, after not consolidated non-drained triaxial compression test, the soil shear strength parameters was determined. The results show: after thawed, soil shear strength had reduced significantly, and water content exerted such a pronounced effect on strength of reducing amplitude. Accordingly, the relationship of shear strength reducing after thawing of remolded soil and the water content was set up preliminarily.
Hazard Assessment of Debris Flows Based on Catastrophe Theory
Authors: Shang Guan Yun Long , Wang Qing , Xu Li Ming , Pan Gui Zhen
Published: October 2012

In the hazard assessment of debris flows, the determination of weights of assessment indices is both important and difficult. Base on the difficulty in defining weight values, the catastrophe theory is used in the hazard assessment of debris flows, and the advantage of catastrophe theory in the multi-rule assessment is used to avoid the subjectivity of artificial weights. The proposed method is conducive to calculation and does not necessarily define the weight of evaluation indices so that the influence of subjective factors on assessment can be minimized. The assessment results indicate that new assessment method is reasonable and feasible, and it provides a new idea for hazard assessment of debris flows.