bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Analysis on Interaction Induced by Crosswise Tunneling
Authors: Gan Peng Lu , Tang Xiao Wu , Shen Wen Ming , Wang Heng Yu
Published: July 2014

A position conflict exists between Harbin Urban Rail Transit Line No.1 and the branch tunnel of "7381" civil air defense tunnel. Intense tunnel interaction occurs when Line No.1 is perpendicularly tunneled across the branch tunnel. The investigation of the interaction is necessary. A 3D numerical simulation is established using FLAC3D and the vault deformation around the tunnel intersection is analyzed. The vault settlement of Line No.1 increases by 1.4 times during crosswise tunneling, while the vault settlement of branch tunnel increases 21.0mm in addition. The affected region of the tunnel intersection is further revealed. The affected length of the vault of Line No.1 and branch tunnel is 7.5 times the diameter and 6 times the width respectively. In combination with monitoring data, the reinforcement effect is studied at last. Both the vault settlement and surface settlement are well controlled in the tunnel intersection.
Research on Key Technology of Shield Machine Main Drive Sealing
Authors: Li Run Jun , Shan Ren Liang , Gui Yi Xiong , Yang Jin Zhong , Liu Jian
Published: July 2014

Due to poor bonding of a shield machine main drive leading to seal failure sealing fracture failure occurs, the proposed installation forms of adhesive sealing method is replaced by platen method, and seal material NBR replaced by a fluorine rubber, so that the combination of the housing seal is more reliable, avoiding the fracture caused by discontinuity of local sealing. Construction process increases the injection of three different oils enhancing the sealing effect. Through the application of practical project, no failure appears after sealing transformation.
Stability Analysis of Wall Structure which its Depth is over Thousand m
Authors: Wang Ying Hao , Fu Xiao Chen , Jing Xiao Hong
Published: July 2014

According to the monitoring result of wall structure which its depth is over thousand, analyzed the strain of inner and outer edges of concrete and inner steel; Neglect construction factors, by comparing the strain of inner concrete and inner steel, it shows that their deformation is consistently; Using the average strain of inner and outer edges of concrete to check strength adopting method of concrete structure design code, shows that they can meet the requirement.
Numerical Simulation for Construction Process Large-Span Flat Tunnel under the Condition of Shallow Buried
Authors: Li Jun Jie , Tuo Li , Zhang Guan Jun
Published: July 2014

The thesis takes a three-lane tunnel construction in Zhejiang as an example. Simulating the course of dynamic construction of large-span tunnel on geology condition of four-grade rock mass and shallow buried by FLAC 3D software ,it carries out comparative and stress situation in the runnel surrounding rocks .Getting the displacement and stress changes rule of the construction by using benching with a small pilot tunnel tunneling method can guide the construction scientifically.
The Application of Getting Rc Value from Point Load Test and Rebound Test by Tunnel Surrounding Rock Classification System
Authors: Wang Ri Xu , Yuan Zhong Chen
Published: July 2014

The point load test and rebound tests were part of a simple rock testing methods, which together with a user-friendly, work environment characterized by less demanding test, so test the application of rock in the tunnel are very broad. Obtained by these two tests of rock uniaxial compressive strength Rc saturation level for the characterization of rock hard quantitative indicators, in the rock classification has a high status. With the computer technology in tunnel works in the field of application that can batch test data to establish the tunnel surrounding rock classification system. Article is based on two kinds of test in the same tunnel project in contrast to the use, through the rock classification system to analyze and evaluate both.
The Research on Environment Vibration due to Subway with Rail Pads of Frequency-Dependent Stiffness
Authors: Yang Fan , Wei Kai , Song Yan Chen
Published: July 2014

Based on Vehicle-Track Coupling Dynamics and the spectrum analysis technique of the Finite Element Method, a frequency-domain method of environment vibration due to subway is put forward and frequency-range distribution of ground acceleration is discussed. Compared with the measured data, the result shows that after considering frequency-dependent stiffness of rail pad, the error is less than 0.3dB in the frequency range of 0-30 Hz, but it is up to 11.8 dB in the frequency range of 50-100 Hz. And the frequency-domain distribution of ground vibration changes too. Thus, the frequency-dependent stiffness of rail pads is not negligible in the prediction of environment vibration generated by subway.
Tunnel Lining Microstructure and Mechanical Properties of Evolutionary Analysis
Authors: Ma Yun Dong , Liang Shuang
Published: July 2014

For the tunnel lining microstructure, mechanical properties evolve analyzed. This paper have established and meshed microstructural model and got the situation under its force structure loads, the cracking strain as a criterion for its application fracture criterion to get a good cracking and expansion of the tunnel lining meso model. The results of the case under the macrostructure of the model compared with the microstructure results can get the adventage of the microstructure in using tunnel lining.
BIM Technology Used in Underground Subway Station Planning Simulation
Authors: Pu Hong Ke , Wei Qing Chao
Published: July 2014

This paper studied the underground subway station planning depend on BIM technology. The existing 3D buildings’ information was processed by computer technology. Using the information and planning based on constraints on the space station, the simulation of the actual situation in 3D view way constantly, adjust planning position, compare each project calculation cost, obtain the optimal line position. We can carry cooperative design plan the subway station by the restrictive conditions and achieve the optimal line layout.
Numerical Simulation of Load Transfer Mechanism of T-Shaped Soil-Cement Deep Mixing Column
Authors: Xi Pei Sheng , Zhang Xiao Tao , Liu Bo
Published: July 2014

T-shaped soil-cement deep mixing column load transfer mechanism is different from the general section column. Basing on the fast Lagrangian finite difference method, we study the load transfer mechanism of T-shaped soil-cement deep mixing column at different load levels, expanding head height and the ratio of upper and lower pile diameter. By the numerical simulation we obtained that the axial force plummeted value of expanding head flange increases with the load and the ratio of upper and lower pile diameter increasing, it will decreases when the height of expanding head increasing.This paper can provide a reference for the design of T-shaped soil-cement deep mixing column.
Force Analysis of the Middle Wall in Multi-Arch Tunnel under Central Hole + CRD Method
Authors: Li Jun , Wang Zong Lin
Published: July 2014

arch tunnel construction in the presence of construction mechanics often unclear, the lack of systematic design and construction of the theory can learn. Harbin Clinic Road thesis double-arch tunnel project as the basis, the construction process through its hole + CRD using the finite element simulation analysis and on-site monitoring measurement data processing, engineering arch tunnel song used in the wall study the mechanical properties.
Force State of Country Rock and Supporting Structure in Multi-Arch Tunnel under Central Hole + CRD Method
Authors: Li Jun , Wang Zong Lin , Zhong Jun Fei
Published: July 2014

The reason situ stress is very complicated, and it is still not very clear question. In this paper, the construction process through practical engineering analysis on a variety of construction methods and steps arch tunnel to study the effects of different excavation methods and deep anchor support large section tunnel under guard by theoretical analysis of surrounding rock stress field, strain field and variation of the displacement field, analysis of different rock excavation methods, supporting stress state characteristics, in order to optimize the choice of tunneling method provides a theoretical basis. Under the conditions all kinds of rock reasonable steps to secure construction methods put forward and lay the foundation for long-term safety arch tunnel.
Study on Investigation and Analysis of Existing Railway Tunnel Diseases
Authors: Zhao Dong Ping , Tan Xin Rong , Jia Ling Li
Published: July 2014

Due to the impact of geological condition, climate condition, design, construction and other factors, the existing railway tunnel appears some diseases more and more, and even some diseases have serious influence to the normal use of tunnels and traffic safety. To eliminate these dangers, we should understand the type of diseases and their causes. Based on the existing tunnel disease investigation and analysis, tunnel diseases were classified, the reason of tunnel diseases were analyzed, which can provide a reliable basis for the tunnel disease treatment. The result indicates that railway tunnel diseases include lining water leakage, lining structure disease, lining concrete disease, foundation disease, lining off block and so on. All kinds of diseases of tunnel lining are often interrelated, so the tunnel disease usually is a result of multiple factors.
One-Dimensional Consolidation Modelling for Unlayered Soil
Authors: Hanafi Issam , Dimane Fouad , Mata Cabrera Francisco , Tejero Manzanares José
Published: July 2014

In this work, one-dimensional problem has a well-known linear solution and, thus, provides a simple verification of the consolidation capability using numerical solution. The coupling is approximated by the effective stress principle, which treats the saturated soil as a continuum, assuming that the total stress at each point is the sum of an effective stress carried by the soil skeleton and a pore pressure in the fluid permeating the soil. This fluid pore pressure can change with, and the gradient of the pressure through the soil that is not balanced by the weight of fluid between the points in question will cause the fluid to flow: the flow velocity is proportional to the pressure gradient in the fluid according to Darcy's law. A typical case is a consolidation problem. Here the addition of a load to a body of soil causes pore pressure to raise initially; then, as the soil skeleton takes up the extra stress, the pore pressures decay as the soil consolidates. The Terzaghi problem is the simplest example of such a process. For illustration purposes, the problem is treated with and without finite-strain effects. The numerical solution agrees reasonably well with the analytical solution, with some loss of accuracy at later times.
Metro Construction Safety Risk Assessment Based on the Fuzzy AHP and the Comprehensive Evaluation Method
Authors: Zheng Xin , Ma Feng Hai
Published: July 2014

Facing with a variety of risks in the process of the metro construction, the metro construction needs to carry on the risk management. The risk assessment is the main link of the metro project risk management also the foundation of the decision analysis. This paper introduces the basic concept of the subway risk management, as a case study of Changchun No.1 subway construction risk assessment using the fuzzy AHP and the comprehensive evaluation method. The results show that Changchun subway station work sites exist many risk factors and the risk level difference is big. The major attention should be paid to the geological risks, the environment risks and the construction technical risks, while the environment risks and the construction technical risks are the focus of the risk analysis.
Practical and Experimental Study of Grouting Anchor in Slope Reinforcement Engineering
Authors: Lu Guo Ren , Zhang Le Wen , Wang Hong Bo
Published: July 2014

Anchoring technique has been widely used in slope engineering because of its reinforcing function to rock and soil mass. Yet the full understanding of the anchoring mechanism still lags behind the engineering practice. This paper introduces the design process and construction technology of the grouting anchor in slope reinforcement engineering. Based on bolt grouting test, it is found that the effective anchorage length of the grouting anchor depends on the size of the anchor solid and relative physical and mechanical properties of surrounding rock and soil. Research shows that the distribution of shear stress is uneven along the anchoring length. It mainly amasses within the front 1/3 part of the anchoring and increases with the development of outside load. The conclusion is helpful to describe the anchoring mechanism and instructive for engineering practice.
Numerical Analysis of Two Structural Schemes of the HK-Zhuhai-Macau Immersed Tunnel
Authors: Dai Ya Jiao , Zhou Meng Jia , Kong Yu Fei , Liu Xiao Dong , Zhang Zhi Gang
Published: July 2014

Two structural schemes of the Hong Kong-Zhuhai-Macau Immersed Tunnel were compared. In Scheme 1, the prestressed reinforcing bars were to be cut off after installation. And in Scheme 2, the prestressed reinforcing bars will be kept there as they were after installation. A finite element model for sections E12~E15 was built by using the finite element software PLAXIS with consideration to the construction process and different loading conditions to analyze both schemes. The calculation results show that they both meet the design requirements.
Numerical Simulation Study on Three-Step Method Construction for Neighborhood Tunnel
Authors: Cai Ling Ling , Yang Xiu Yuan , Guo Ning
Published: July 2014

When crossing difficult terrain or extreme regional geological conditions encountered, there are difficulties in laying road routes, the spacing between two adjacent tunnels is limited. Neighborhood tunnel is a form of tunnel structure between separate and arch ones, less affected by the topography. It is more conveniently and easier to control the cost. Surrounding rock deformation mechanism with construction of three-step method is more complex, and therefore a reasonable means of construction technology and support is essential. Taking a certain neighborhood tunnel highway engineering background, aimed to provide guidance for follow-up monitoring and support, we use numerical simulation software FLAC3D on three-step method excavation construction. Rational creep analysis of geotechnical model and calculation parameters is selected. It helps to calculation and analysis the mechanical response of tunnel surrounding rock characteristics and clarify the tendency of displacement and stress fields.
Research on Geostatic Stress and Optimization of Bolt Support for Tilted Strata Roadway
Authors: Shan Ren Liang , Tian Liang , Zhao Wen Feng , Lv Jin Yang , Xiao Yu Hang , Wei Long Fei , Hao Xian Yong
Published: July 2014

In order to tunnel safely, efficiently and economically, we carried out the study on geostatic stress characters and optimizing bolting support parameters in 2# coalbed of Zijin Colliery. Based on the surveys of geological conditions, original rock stress, broken rock zone measurement and analysis of roadway deformation, characters and mechanism of roadway failure is figured out. According to existent problems, normal support theories were used and a variety of numerical computations were carried out by FLAC3D.New support methods of bolt installed vertically in tilted roof and strengthen support of sidewalls and corners of roadway were figured out. Monitoring of convergence meters and roof separation were followed to know effects of new design timely. The research was carried out for 600 meters The monitoring results proved that the optimized support design was viable and the new bolting parameters were reasonable.
Research Status and Development Trends of Roadway Surrounding Rock Stability Classification
Authors: Shan Ren Liang , Kong Xiang Song , Liu Jian , Li Jian Fang , Bai Yao , Song Yong Wei
Published: July 2014

Stability classification of roadway surrounding rock is of great significance as the prerequisite of safe production in roadway engineering. Based on a great number of issues analysis, the research status of roadway surrounding rock stability classification has been dissected from aspects of classification indexes and methods. At the end, it has put forward that choosing scientific and reasonable indexes, applying combined technology with more than three methods, using new technology and new methods are the three development trends of roadway surrounding rock stability classification research.
Research of Fractured Surrounding Rock Physical and Mechanical Characteristics in Shuguang Mine No.2 Mining Area
Authors: Xue Hua Jun , Xue Jun Long , Yin Ming Lun , Kong Jie , Gao Zong Ming
Published: July 2014

Since the excavation of roadway in Shuguang mine No.2 mining area, shotcrete layer has fallen off and the surrounding rock deformation was serious. For studying big deformation of roadway in Shuguang mine No.2 mining area, the paper analyzed fractured surrounding rock physical and mechanical characteristics of No.2 mining area. The results show that the uniaxial compressive strength, uniaxial tensile strength, cohesion, internal friction angle of fractured surrounding rock were very low. And the whole physical and mechanical characteristics were poor. It is the basic reason of big deformation of roadway surrounding rock physical and the important basis of late supporting of roadway.
The Application of Fracture Mechanics in Highway Tunnel Lining Cracking
Authors: Chen Song Zhou
Published: July 2014

Lining cracks of highway tunnel has a very important effect on the healthy operation of the tunnel. Establishing the model for concrete fracture mechanics evaluation, we could identify the tunnel lining cracking situation. By using Linear elastic fracture mechanics method we could calculate the stress field of crack in the lining. Separately by different depth we have calculated crack stress intensity factor. We get that growing rates of variation of stress intensity factor as the crack depths increase. So lining tunnel health operations severely cracked.
Studies on Damage Distinguishing of Underground Tunnel Structure Based on BP Neural Network
Authors: Zuo Xi , Chen Guo Xing , Li Wei Qian
Published: July 2014

With the expansion and development of scale of construction on metro engineering, the damage diagnosis and the safety evaluation on underground engineering structure have become vital problems to be solved. This paper raised an idea to distinguish underground engineering structure based on BP neural network: define change rate of curvature of structure, and recognize it as the input scalar of BP neural network, using a reducing unit elastic modulus method to simulate damage location and damage degree, through various set of underground structure extent of damage, recognize the first four order curvature structure change rate as input of BP neural network. The results show that the method using BP neural network can identify the damage degree of underground engineering structure accurately and can solve the damage identification problem of underground engineering structure conveniently and effectively.
Numerical Simulation Method Utilization in Water Gushing Yield Forecasting of Paoziling Tunnel in Hunan Province, China
Authors: Yang Yan Na , Zhang Qiang , Xu Mo
Published: July 2014

Empirical analytic method and theoretical analytic method are usually applied to calculate and predict water gushing yield in the tunnel engineering in the past but have much limitations and errors. Ample water source, hydrodynamic conditions and expedite channels are essential for water-bursting accidents in railroad tunnel engineering. From a lot of study of fractal geometry in rock mass, it is found that the multi-dimension value of fissure network is colligate reflection of the length, the direction, space and the number of fissures, so the value can be used to describe the complicated frameworks in rock mass. But it is a sound tackle to quantities the complicated frameworks. Numerical simulating method is convinced to be applied to calculate and predict water gushing yield of tunnel and underground engineering. It focuses on analyzing texture characteristics of water-containing medium, building hydro-geological conceptual model, and modeling long-term hydrodynamic field development. An experimental application in Paoziling tunnel under-crossing mountain reservoirs in Hunan province was presented in this article, and long-term hydrodynamic field development had been obtained under the condition of drainage from the tunnel, and the gush yield in the tunnel during the process of storing water in the reservoir was also predicted.
Damage Mechanism of Yiliang Earthquake on September 7, 2012
Authors: Lin Zhuo , Tian Ming , Chen Dong Bai , Li Chun Feng
Published: July 2014

According to the analysis of the structure, topography, earthquake sequence, and earthquake hazards in September 2012 earthquake of Yiliang County, Yunnan Province, the mechanism of the earthquake damage is given. The low-cycle fatigue, shallow source, topography, population density, seismic capacity of the structure and seismic awareness of the residents is the main damage factor. This research provides a reference to the seismic design of analogous regions.
Deformation and Energy-Based Seismic Damage Evaluation of Steel Reinforced Concrete and Reinforced Concrete Piers
Authors: Lin Jia Jue , Liu Ai Rong , Yu Qi Cai , Deng Jiang Dong
Published: July 2014

The method of MMCP (modified modal cyclic pushover) which can reflect the dual criterion of deformation and energy was used to make an assessment on seismic performances of the steel reinforced concrete piers and reinforced concrete bridge piers. Then the calculated results were analyzed comparing with the results of dynamic time historical analysis and quasi static test. To some extent, the MMCP analysis may simulate the seismic action. In addition, the MMCP method can also be associated with the design response spectrum, making the evaluation results to be reliable and safe. The results indicate that MMCP applicability analysis also exists in the steel reinforced concrete structure, and the seismic capacity of steel reinforced concrete bridge piers is better than reinforced concrete bridge piers.
Experimental Study on Dynamic Mechanical Properties of Galvanized Iron Wire under Seismic Strain Rate
Authors: Zhang Hao , Zhang Jia He , Wang De Bin , Li Xu
Published: July 2014

This paper focuses on the mechanical properties of galvanized iron wire under various conditions of earthquake-type strain rate. The dynamic tensile test of galvanized iron wire was conducted on MTS New 810 electro-hydraulic servo-controlled testing system. The dynamic tensile constitutive relationship of galvanized iron wire was proposed under seismic strain rate. The accuracy of the proposed constitutive relationship of galvanized iron wire was verified by comparing with reinforcing steel.
Shaking Table Test of Reinforced Concrete Frame-Wall Model
Authors: Zhang Hao , Li Bing , Li Xu , Wang De Bin
Published: July 2014

A 1/5 scaled three-story RC (reinforced concrete) frame-wall model was modeled in microconcrete and fine wire and carried out on the shaking table. The main objective of this paper aimed to investigate the dynamic characteristics, the seismic responses, and the failure mechanisms of the model, also concentrated on the strain rate of concrete on structural members under seismic action. Based on the test results, some significant conclusions are obtained for engineering practice.
A Method for Checking Eccentricity of Solid Concrete Piers with Low Longitudinal Reinforcement Ratio under a Minor Earthquake
Authors: Chen Xing Chong , Liu Zun Wen , Zhang Yong Liang , Pei Lu
Published: July 2014

Solid concrete piers with low longitudinal reinforcement ratio are extensively used in high-speed railway in China. However, how to check such structures is not specified in current technical codes. Checking these structures by eccentricity and stress indexes is discussed hereby. The moment-curvature relationships for piers of various reinforcement ratios are presented by employing the software UCfyber and these moments are compared with moments calculated by allowable stress approach, moments corresponding to the code-specified permissible eccentricity, moments corresponding to the allowable reinforcement stress and stabilizing moments induced by tensile reinforcement and self-weight of the piers, respectively. The results show that the allowable stress approach could be used to check the strength and eccentricity of solid concrete piers with low longitudinal reinforcement ratio in high-speed railway; the restriction on permissible eccentricity may be to a proper extent relaxed for such piers, based on the fact that tensile reinforcement provides an additional stabilizing moment and the reinforcement contributes to the pier’s bearing capacity.
Data Processing and Preliminary Analysis of Strong Motion Records from the Ms7.0 Lushan, China Earthquake
Authors: Yu Hai Ying , Zhou Bao Feng , Jiang Wen Xiang , Yang Cheng , Xie Quan Cai , Tan Ping Yu , Xu Si Ming , Zhao Xiao Fen
Published: July 2014

At 8:02 a.m. Beijing time on April 20, 2013, an Ms 7.0 earthquake shook the city of Ya’an, China. Until 24:00:00 on 20 July 2013, a total of 339 strong-motion records from 113 free-field stations, 21 records from 1 strong-motion structure array and 1123 groups of aftershock records have been collected, processed and analyzed preliminarily by the China Strong Motion Network Center (CSMNC) in this paper. There are more than 26 stations located within Longmenshan fault zone and all peak ground acceleration (PGA) of records is larger than 50gal. The PGA of Baoxingdiban station reaches 1005.4 gal after zero-line initialization, which firstly breaks through 1g in the mainland of China. Based on the mainshock records, shakemaps of those PGAs are plotted and attenuation relationships of PGAs are presented in this article.
Ultimate State of Bridges with Rocking Isolation under Extreme Earthquakes
Authors: Lee Tzu Ying , Huang Min Yen , Chung Kun Jun
Published: July 2014

This study is aimed to analyze the ultimate state of bridges with rocking isolation of spread foundations under extreme earthquakes. The Vector Form Intrinsic Finite Element method (VFIFE) is adopted to simulate the failure procedure of bridges with and without rocking isolation. To simulate the highly nonlinear behaviors between soil and foundations, Winkler-based models are established in the VFIFE in this study. A practical five-span bridge with spread foundations is chosen to study the effect of rocking isolation and discuss the influence of altering parameters of bridges. The analytical results are compared between linear soil springs and nonlinear soil springs. Furthermore, the ultimate state of bridges is simulated to realize the dynamic behaviors of bridges under extreme earthquakes.
Verification of LSSRLI-1 Applicability on Soft Sites Using Exact Solution
Authors: Li Rui Shan , Yuan Xiao Ming
Published: July 2014

LSSRLI-1 is an equivalent linear program which is used for seismic ground response analysis. Since the LSSRLI-1 was proposed by Xiaojun Li in 1989, it played very important role in seismic safety evaluation, solved the inputting problem for dynamic response analysis of structure. Some deficiency was found in the practice, especially when the layered site is soft. Linear exact solution is deduced in the frequency domain.based on the engineering wave theory. A program is compiled in the MATLAB environment, which is used to compare with the LSSRLI-1 results, including the ground response spectrum and the soil strain distribution.
Reliability Analysis in Performance-Based Earthquake Engineering
Authors: el Ghoulbzouri Abdelouafi , el Alami Zakaria , el Hannoudi Sabrine
Published: July 2014

The performance-based engineering approach, as opposed to prescriptive rules of code-based design, is based on simulation of real structural behavior. Reliability of the expected performance state is assessed by using various methodologies based on finite element nonlinear static pushover analysis and specialized reliability software package. Reliability approaches that were considered included full coupling with an external finite element code based methods in conjunction with either first order reliability method or importance sampling method. The building considered in the actual study has been designed against seismic hazard according to the Moroccan code RPS2000.
Analysis of the Influence of Mortise-Tenon Joint Damage on Seismic Performance of Ancient Timber Structure
Authors: Wang Xue Liang , Jin Liang
Published: July 2014

This research investigated the influence of mortise-tenon joint before and after damage on seismic performance of ancient lifted-beam timber structure. Dynamic responses of an ancient timber structure under various earthquake intensities were analyzed by ANSYS to extract the M-θ hysteresis loops of mortise-tenon joints before and after damage. The area of the largest hysteresis loop was taken as quantitative indicator to measure energy dissipation of mortise-tenon joints. The results shows that if some mortise-tenon joints were damaged, they dissipated much less earthquake energy decreasing by 31.8%-38.5%, and top displacement of structures increased by 1.79%-5.96% correspondingly. Moreover, the displacement under 8-degree-fortification, 7-degree-rare earthquake intensity increased most obviously. Therefore, energy dissipation of mortise-tenon joint is a main indicator to the assessment of seismic performance of a damaged ancient timber structure.
Seismic Reduction and Control Analysis of Hybrid Structure with Viscous Dampers under Strong Earthquake
Authors: Qiu Sen , Deng Shu Cheng , Zhu Zhao Quan
Published: July 2014

This article focuses on the effect of viscous damper on seismic performance of steel-concrete hybrid structure under strong earthquake. The result shows that viscous damper has effect on seismic reduction and control. The story lateral displacement, story drift rotation and energy dissipation-seismic can be reduced effectively by viscous dampers. The maximum value of vibration-reduction ratio is 36.0%, 67.9%, 36.9%. It is different effect on seismic reduction by different earthquake ground motion. Response of earthquake amplifies under Pasadena earthquake wave than the others.
Study on the Anti-Seismic Performance of New Swing Structure System Based on PUSHOVER
Authors: Liu Di
Published: July 2014

Swing structure is added to the current frame structure for forming the new swing structure system. In this paper, by taking the existing structure as an example, the anti-seismic performance of the new swing system is analyzed with pushover method and the current earthquake resistant design code, and influence of swing rigid frame with different stiffness ratios on the anti-seismic performance of the new structural system is discussed. According to the results, by setting swing rigid frame with different stiffness ratios, it can enhance the bearing capacity and ductility of the structural system remarkably, coordinate the deformation model of the structural system, give full play to the energy-dissipating capacity of the structure, and improve the anti-seismic performance of the structure.
Inertial Coefficient Adopted in Pile-Pier Structure under Deep Water
Authors: Sun Guo Shuai , Liu Chunguang , Xie Jun , Ma Fang Jing
Published: July 2014

In order to study the effect of hydrodynamic pressure acted on pile-pier structure in deep water, an investigation on the inertial coefficient is developed. Based on the Morison equation, the usual suggested value is analyzed, especially the noncircular slender cylinder is considered. Besides, the effect of scale of structure is studied, including accurate algorithm and approximation algorithm. Study results indicate that the Morison equation is also applied to noncircular slender cylinder, and the value of inertial coefficient is influenced by the scale of structure. Moreover, the calculated results of accurate algorithm and approximation algorithm are consistent within a certain range, so the choice of calculation method should be governed by the required precision.
SRC Frame-RC Core Wall Hybrid Structures Collapse-Resistant Design
Authors: Wu Yuan Yuan , Cui Zhen Kun , Gong Qian Qian , Zeng Lei
Published: July 2014

To study Steel reinforced concrete frame-reinforced concrete core wall (SRC frame-RC core wall) hybrid structure earthquake damage evolution and collapse mechanism, this paper holds the earthquake collapse mechanism, seismic collapse analysis and collapse control strategies as the mainline, establishes performance degradation and collapse criterion characterization based on structure dynamic characteristics, adopts incremental dynamic analysis (IDA) method to complete the prototype structure collapse-resistant test and quantitative assessment of seismic collapse analysis and determine the main factors that affect the structure collapse-resistant properties. Through numerical analysis to reveals the mechanism of the earthquake collapse and obtains optimal collapse model, and proposes methods and measures of collapse-resistant design for such structure, which has practical significance for enhancing the ability of high-level hybrid structure to earthquake.
Study of Intake Tower under an Earthquake Using the Power Spectral Method Based on ANSYS
Authors: Hua Xia , Yu Chang Quan , Zhu Wei Hua , Zhao Kun , Huang Chun Lin
Published: July 2014

In this paper, the power spectral density method based on ANSYS is carried out to study the intake tower finite element model under an earthquake. A power spectral density function is obtained and disposed to be smooth. Then it is used to study the intake tower when the seismic wave occurs in the direction of flow and perpendicular to the direction of flow .This study provides theoretical basis for reinforce and transform of the intake tower structure.
Studies on Seismic Measures to Improve Masonry Infilled Wall
Authors: Zhang Yao Jun , Duan Xu Sheng , Wang Xin Yuan , Zhou Cui Ling , Sun Yong
Published: July 2014

brittle nature of masonry infilled wall and the wrong connection with the main structure , resulted in the destruction phenomenon in the earthquake . Based on the destruction phenomenon ,this paper analysis the Earthquake damage of masonry infilled wall , according to code for seismic design of buildings (GB50011—2001) and code for seismic design of masonry structures (GB50003—2011) , some seismic fortification measures were proposed in this paper aimming to improve seismic capability of infilled wall, thereby alleviate loss caused by earthquake.
Expected Annual Earthquake Loss Analysis Based on CMR of Structures
Authors: Xian Li Na , Ou Xiao Ying
Published: July 2014

Incorporating the probability of seismic hazard, expected annual earthquake loss with different collapse margin ratio (CMR) has been studied in this paper. Nonlinear simulation models of reinforced concrete (RC) frames were analyzed using incremental dynamic analysis (IDA) under continuous earthquake intensity. The analytic results from four examples of RC frames show that the expected annual loss has negative correlation with theCMRof the concerned structures, and seismic loss basically decreases with increasingCMRat given ground motion intensity. The proposed idea herein could be regarded as a promising improvement on the quantification of earthquake loss estimation by utilizingCMRof structures.
Earthquake Mitigation Effect Analysis of Hysteretie DamPers in Steel Frame
Authors: Xu Chao , Niu Yong Feng , Zhao Yong Xie
Published: July 2014

This paper analyses the frame without mild steel dampers and the frame installed the new T-type , box –type and S-type mild steel dampers by FEM ABAQUS. The results shows the frame installed the new mild steel dampers have smaller yield displacement and the fuller hysteresis curve at low cyclic load, but the initial stiffness, yield strength , stiffness after yielding are greater. Research shows that the new type mild steel dampers have good energy performance, and have the better effect to seismic framework.
Vulnerability Analysis of Existing Buildings under Seismos
Authors: Meng Xian Hong , Yang Guo Zhi
Published: July 2014

By studying the structure of vulnerability analysis and abroad , on their respective merits and defects were compared and analyzed to select the best of vulnerability research methods. Combined with the existing building characteristics, the nonlinear static method on both the vulnerability analysis of old buildings also applicable conclusions. Effective solution to the existing buildings under earthquake disaster risk assessment.
Finite Element Analysis of Seismic Responses of a Large-Cantilever Stadium Structure
Authors: Sun Ze Yu , Jin Qiao , Jia Lian Guang , Wang Qiang , Ma Yi , Xu Chi
Published: July 2014

In this paper, based on the Midas/gen platform, a three-dimensional finite element model (FEM) for a transfinite stadium with a large-span and large-cantilever roof , located in Shenyang, was used to study its potential responses to seismic activities. In the numerical analysis, an earthquake spectrum stipulated by the Chinese Seismic Code (GB50011-2010) was adopted to calculate the bidirectional horizontal displacements by the Complete Quadratic Combination (CQC) method on the basis of the response spectrum analysis. The computational results indicate that the maximum displacements in both of the two horizontal directions locate at the top of this structure, i.e. the transfinite part of the roof.
Analysis of the Influence of Bottomland Change on Waterway Conditions in Liyushang in Middle Reaches of the Yangtze River
Authors: Zhu Yu De , He Jun
Published: July 2014

This study Base on the HuangLianzhou heart beaches and Shejiwang tidal flat of years of evolution, revealing the relationship between HuangLianzhou heart beaches and Shejiawan tidal flat erosion and Waterway conditions, and explore affecting factorsof the waterway poor conditions , which have a guiding significance for the solution to the current problem of the river channel.
Analysis on Hydrodynamic Load that Induces High Dam Body Vibration
Authors: Wang Chun Tao , Ding Hong Xia , Lv Hui
Published: July 2014

It is difficult to get a theoretic answer to the water flow load features of high dam flood discharge. Through direct measurement of water flow load features by arranging a surface pressure cell, the complicated point-surface conversion was avoided, and the shock load and surge load features were obtained. For the dam body outlet wall pressure, isolated the fluctuating load applied to the plunge pool floor and the downstream dam surface, the impact of the fluctuating load to the arch dam dynamic response at the flood discharge flow outlet was obtained, and then the equivalent fluctuating load on each discharge flow outlet was obtained by using flow-induced vibration back analysis. The test shows that the energy of the shock load and the surge load mainly centers in a frequency range between 0~1Hz, the shock load is about 2.5-6 times that of the surge load, and the surge load is about 4 times that of the outlet wall pressure.
Evaluation of the Effects of Channel Regulation Engineering Works in Typical Braided Reach
Authors: Han Jian Qiao , Li Li Qin
Published: July 2014

The evaluation of the effects of regulation engineering in Jiayu-Yanziwo reach is presented through the process of: (a) the introduction of study area and regulation works; (b) the establishment of a two-dimensional flow and sediment numerical model; (c) the evaluation of regulation works effects. According to the phenomenon of river process, a series of engineering to prevent the sand bar from erosion are designed. The effects of prevent works is simulated by 2D numerical model verified with measured data. After impound of the prevent engineering, the min navigation width while depth is 3.7m is greater than 150m, the good navigation conditions will maintained in next decade.
Study of Soil Structural Parameters Based on the Gunary Model
Authors: Huang Xue Feng , Kong Yang , Yang Bao Shan , Zhen Ping Fu
Published: July 2014

Structural study of the soil is an important research content of soil mechanics. Based on the previous research results of soil structure, this paper puts forward the Gunary Model as a completely new form to describe the stress-strain relationship of soil, to discuss the method to determine soil strain considering structural parameter under the new model, to give the relevant function of the stress controlling structural parameter with stress. The results show that the Gunary Model is applicable to characterize the stress-strain relationship of soil, the parameter controls the fitting accuracy and decides the curve shape; by using the stress-strain expression of the Gunary Model, this paper finds the calculated value of stress controlling structural parameter and stress meets the two-parameter linear reciprocal function form.
Finite Element Analysis of Stress Deformation of Earth-Rock Dam on Narrow Valley
Authors: Chu Fu Yong
Published: July 2014

The three-dimentional finite element analysis is adopted to simulate and cauculate the stresses and deformations of a certain core rockfill dam on narrow velley, with Duncan-Chang E-ν model during its completion and operation periods by incremental loading.The results show that the stresses and deformations of core rockfill dam on narrow velley are allowble and the design proposal is reasonable, which provides the theoretical basis for similar engineering.
Philosophical Reflections on Chinese Water Resource Management
Authors: Liu Ying Fei , Ruan Ben Qing , Xie Cong Cong
Published: July 2014

Water is crucial to production, and is the foundation of ecology. Building a reasonable management system for water resources is necessary and important, and it’s an inevitable requirement of our strategy of sustainable development. In the management of behavior, philosophical base determines the behavior trends. With the development of socio-economic development, the strategy of water resources management has changed a lot in China. In this paper, the problems caused by improper water resources management modes and by overly governing by people are discussed and a series of water management reform proposals are developed on the bases of the ancient Chinese management philosophy. The paper then gets the conclusion that the water resource management reform is actually following the management path from “governing by people” to “governing by nature”.
Research on Channel Regulation Parameters of Daijiazhou Reach in Middle Yangtze River
Authors: Liu Wan Li
Published: July 2014

Channel regulation parameters include two important indicators, the regulation water level and regulation width. Through shoal-full water level method, bed-forming discharge method and experience method, the regulation water level was presented. At the same time, through calculation method and experience methods used in sufficient depth channel, the channel regulation width was put forward. The relevance between the regulation water level and regulation width was established. The specific regulation parameters were adopted in Daijiazhou reach.
Study on Sandy Pebble Reach Riverbed Erosion and Deposition Basic Law after the Three Gorges Reservoir
Authors: Liu Xiao Fei , Zhang Mei Li , Ye Zhi Wei
Published: July 2014

After the Three Gorges Reservoir, sandy pebble Reach incoming water and sediment conditions has change, the changes of incoming water and sediment conditions might make sandy pebble reach riverbed scouring-erosion variation. This paper study on sandy pebble reach riverbed erosion and deposition basic law after the Three Gorges Reservoir, and provide the decision basis for large-scale system renovation in the middle Yangtze River.
The Study of Available Water Resources in Northern Shaanxi
Authors: Wu Xi Jun
Published: July 2014

In order to alleviate the contradictions about water resources shortage and socio-economic development in Northern Shaanxi, the water resources and their availability were studied. Through use the method of surface water resources deducte river ecological basic flow and flood discharge, calculated the surface available water resources and total available water resources of Northern Shaanxi, summarized their distribution characteristics. Study result showed that the available water resources of Northern Shaanxi is low, only 1.6 billion m3, available rate is 40%, water resources and their availability principally distribute in Yulin.
Study on Static Strength of Aeolian Sand before and after Cyclic Loading
Authors: Liu Da Peng , Yang Xiao Hua , Wang Jing , Mao Zheng Jun
Published: July 2014

Aeolian sand is one commonly used subgrade filling in Xinjiang Oasis-desert region, engineering practices also proved its applicability as subgrade filling. In order to find the law of Aeolian sand subgrade static strength after cyclic loading, the paper studied the static strength of Aeolian sand before and after cyclic loading through the dynamic and static triaxial tests. It is concluded that the greater cyclic loading is, the more Aeolian sand static strength peak decreases. When cyclic loading is small, the bigger confining pressure and consolidation ratio are, the static strength peak increases more after cyclic loading. The bigger initial static deviator stress is, the more Aeolian sand static strength peak reduces. The frequency of cyclic loading has little effect on static strength. In order to keep the stability of low embankment, we should restrict overload , ensure subgrade and foundation consolidation adequately, at the same time using gravel or geosynthetic materials to package edge of roadbed, so as to increase confining pressure. The research results can provide reference for the design and construction of Aeolian sand low subgrade in Xinjiang Oasis-desert region.
Study on the Development of Plastic Zone Based on Strain Expressed Mohr- Coulomb Yield Condition
Authors: Yang Cai , Feng Tu Gen
Published: July 2014

At present, there is a lot of research for slope stability, the inherent reason of slope instability is geotechnical material will get plastic deformation under load. In this paper, Mohr- Coulomb yield condition is transformed strain expressed to stress expressed.Based on this, analysis the effects that geotechnical material parameters internal friction angle ,cohesion c and Poisson's ratio to Mohr- Coulomb yield condition and the development of soil plastic zone.In addition, using the strength reduction FEM simulating the change of plastic zone distribution caused by change of the geotechnical materials parameters .The results show that the internal friction angle , cohesion c are reducted, the plastic zone expand;Increasing the Poisson’s ratio , narrowing the slope’s plastic zone;Plastic zone’s different distribution is caused by different material parameters affect the yield surface.
Impact of the Cascaded Reservoirs and the Tributaries Confluence on the Eco-Hydrology of the Reserve in the Upper Reaches of Yangtze River
Authors: Zhao Li , Peng Qi Dong , Chen Qu Chang , Li Chong , Yin Zheng Jie
Published: July 2014

For studying the impacts of the tributaries confluence on the hydrological processes in the downstream reaches of the four cascaded reservoirs in the downstream of Jinshajiang River, this paper simulated the daily discharge at the outlet of the cascaded reservoirs and along the reserve mainstream in typical years with the operation programming of the reserve and MIKE11 hydrodynamic model, and eco-hydrology indicators were selected and calculated by IHA to quantify the hydrology process. The result showed that at Xiangjiaba Gauge Station discharge on April and May increased by about 100%, the discharge in low flow year decreased by 50% and the timing of annual 1-day minimum discharge has significantly alteration. The confluence of Minjiang River could effectively mitigate the impacts of the cascaded reservoirs on eco-hydrology of the downstream of the confluence, but the mitigation of others three tributaries were not significant. Moreover the pre-flood high flow in the downstream of the Minjiang River confluence increased by 50%, and other indicators alteration were not significant.