bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Influence of Shield Tunneling Crossing underneath Intercity Railway and Shield Tunneling Parameters Optimization
Authors: Deng Xiang Hao , Wang Bing Long
Published: August 2013

In the construction process of shield tunneling crossing underneath a intercity railway, it is inevitable to bring a potential safety hazard to the safe operation of the railway. Determing how to evaluate the influence of shield tunneling crossing underneath the railway and how to reduce the influence level are urgent to be solved. Taking a Wuxi subway project cross beneath the intercity railway for example, through numerical simulation and on-site monitoring, the influence level and the best construction parameters for the shield construction have been obtained. Under the action of the most unfavorable load, the settlement of the railway was only 1.9mm after shield tunnel cross through it. Through theoretical analysis and on-site dynamic monitoring methods, it optimized the configuration of shield construction parameters.Adopting the suggested methods, the shield tunnel has crossed through the railway successfully and the results show that the settlement control is perfect.
Public Use Planning of Civil Air Defense Works in Residential District
Authors: Shen Jin Chang , Yang Jun , Zhu Wen Jun
Published: August 2013

The civil air defense works are underground protection spaces built in case of war. At present the amount of these works has reached a considerable scale and thorough exploitation and reasonable utilization of these space resources in peacetime is also the key to sustainable development of civil defense. Aiming at the public use planning of Beijings civil air defense works in residential district, the public service suitable for locating in these works and the demand of public service are analyzed. And a suitability evaluation index system for this purpose is established by adopting the method of analytic hierarchy process (AHP). A frame of public use planning of civil air defense works is formed by summarizing the use planning principles of public service and determining the public use planning procedure. The method system can provide technical support and theoretical direction for public use of civil air defense works in residential district of Beijing, and provide reference for other provinces and cities.
Elastoplastic Analysis of Surrounding Rocks of the Pressure Tunnel
Authors: Qiong Shen
Published: August 2013

According to the triple shear unified yield criterion, the mechanical behavior of the pressure tunnel was put forward. The calculation formulas of the radius of plastic zone were deduced with considerations of the effects of the intermediate principal stress. The results show that the intermediate principal stress effect parameter b has influences on the radius of plastic zone. With the increase of the intermediate principal stress effect parameter b, the radius of plastic zone decreases. The radius of plastic zone is increased, because of the increase of the porous hydraulic pressure.
The Triaxial Shear Test of Artificially Frozen Soils in Tunnel Construction of Hong Kong
Authors: Hu Xiang Dong , Wang Jin Tai
Published: August 2013

Three kinds of frozen soils were tested for artificial ground freezing (AGF) project in the tunnel construction of Stonecutters Island Sewage Treatment Works, Hong Kong. Triaxial shear test was conducted to obtain shear strength of frozen soils. From the test, Mohr circles and their envelopes were obtained. According to Mohr circles, shear strength of the three soils was gained. Comparing the three soils, we found the potential weaken layer which might cause failure in the construction. All the parameters obtained can be used in design and construction of AGF practice.
Construction of Zhoutouzui Immersed Tunnel in China
Authors: Chen Hong Juan , Yan Wei Ming , Chen Shi Cai
Published: August 2013

Immersed tunnel was constructed in the year 1910 at the first time. The next few decades, there were more than one hundred immersed tunnels constructed in the world. Zhoutouzui Immersed Tunnel of Guangzhou City is the seventh underwater tunnel in Chinese Mainland. It is one concrete tunnel with rectangular cross-section which is variable because of the constraint conditions at overpass. It has distinct feature in Chinas tunnel design. The overall design and technical characteristics of Zhoutouzui Immersed Tunnel are described in detail.
The Discussion of Issues Related to the Rock Mass Structure Classification of Dam Foundation
Authors: Tang Liang Qin , Tang Kui , Nie De Xin
Published: August 2013

Because various lithologic rock present very obvious differences in many aspects (such as: the apparent lumpiness, longitudinal wave velocity, mechanical property etc), the results of the rock mass structure classification by using current specification or general methods can not reflect the true engineering geological properties. Based on a large number of onsite structural surface investigations, acoustic measurements and field and laboratory tests, this paper discusses the related issues on division of rock mass structure using single lumpiness indicators and analyzes the impact of the structural body property and structural surface effect on the rock mass structure. At the same time, the related issue on the integrality coefficient is discussed in the evaluation of rock mass integrity degree. Finally, the proposal which rock structure classification should consider the structure bodys strength and stiffness, the structure surfaces extension length and closed degree, the structure body block size and the rock mass compression wave velocity is put forward.
Failure Characteristics and Support Optimal Design of Columnar Jointed Rock Mass at a Diversion Tunnel
Authors: Zhu Xiang Dong , Hu Lian Xing , Quan Jiang , Li Shao Jun , Li Jun
Published: August 2013

Columnar joints are native rupture structures which are ordered columnar forms in basaltic lava. The cracks and joints inside them are well-developed which lead to the weak self-supporting ability after excavation. At present, loose and collapse of columnar rock mass are the main problem in the hydraulic diversion tunnel. Based on field observation and test, this paper studied the failure characteristics of columnar joints in the diversion tunnel and simulated the failure mechanism. Based on this discussion, optimized support measures have been taken to ensure the safe construction of the diversion tunnel.
Study on the Mechanical Behavior of Excavation and Support Construction of Shallow Tunnel
Authors: Yang Zhen Xing , Song Liang , Wang Hao , Jiao Yu Yong , Li Shu Cai , Adoko Amoussou Coffi , Zhang Huan Qiang
Published: August 2013

In this paper, the mechanical behavior of excavation and support construction of Weishe tunnel, which is a section of the Yangwu expressway, is studied quantitatively using 3D finite difference numerical simulation method. A sequential excavation method is used and the results show that the vault settlement occurs mainly on the phase of upper bench excavation. The convergences of upper and lower sidewalls occur mainly on the phase of lower bench excavation. During the construction, the surrounding rock pressure in the vault and sidewall of the tunnel decrease. Axial force of anchor reaches the maximum value after the finish of second lining. However, the surrounding rock pressure and internal force of steel arch reach the maximum value after completing the upper bench excavation, and then become as smaller as half of the peak value during the lower bench excavation.
Research on Fractal Crack Propagation Mechanism of Hydraulic Tunnel Concrete Lining
Authors: Sun Xiao , Qiang Yue , Zhao Ming Jie , Wang Kui
Published: August 2013

Based on the fractal geometry theory, the bending form of crack expansion on concrete lining of hydraulic tunnel is described, according to the model of fractal fracture, stress intensity factor of concrete lining crack of hydraulic tunnel is established. Combined with the fracture mechanics theory, the relationship of stress intensity factor on l concrete lining crack is obtained under the hypothesis of crack linear expansion and crack irregular expansion, while the stress intensity factor of latter is less than the former, which is more close to the actual circumstance and more reasonable, whose fractal dimension is obviously larger than the former. The conclusion can provide reference for the engineering design.
Overview on the Bearing Behavior Research of Rock-Socketed Piles
Authors: Luo Yang , Liu Heng , Wang Tie Hang
Published: August 2013

It mainly reviewed the current research status of the bearing characteristic of rock-socketed piles. From reading all kinds of calculation model in different code, it pointed out the disadvantages. It concluded the present work on the two main factors which influence the bearing capacity of rock-socketed pile most. Based on this work, it figures out the deficiencies of the research presently and prospects the future research. In the end, it suggests that the bearing behavior and failure mechanism of rock-socketed piles with thick sediments remains need to be further discussed.
Research of Shed-Cable Supporting Technology & Regularity of Minig Roadway Pressure in Three-Soft Seam
Authors: Liu Yu Wei
Published: August 2013

According the analysis of the test in Baiping coal mine, obtain the characteristics of deformation and failure in three-soft seam roadway; get the exact data of roadways main deformation parameters and make sure the main deformation region division. By using the theory of equilibrium arch, analyze and finally determine bolt (cable) support attached with U shaped tents parameters. On-site tests show that this kind of support scheme can effectively control the deformation in three-soft seam roadway.
Single Opening Tunnel Hood Parameter Sensitive Research
Authors: Wang Ying Xue , Gao Bo , Wen Yu Min , Li Lun Gui
Published: August 2013

when high-speed train passing through tunnel, the micro-pressure wave noise will be created at tunnel exit, which worsening the living environmental condition along the railway line. Building hood at tunnel entrance is an effective method for solving this problem. In this paper, using numeral simulation method, the efficiency of single opening tunnel hood relieving micro-pressure wave noise was researched, the sensitive of hood opening parameter, such as opening ratio, ratio of length and width, was analyzed. In the end, the tunnel hood optimizing parameters was drawn out, which will play an important guiding role for high-speed railway tunnel hood design.
Experimental Study on Seismic Performance of Fiber Reinforced Concrete Pier
Authors: Lan Feng , Li Qian , Chen Zhuo Yi , Ma Wen Gang
Published: August 2013

In order to study the seismic performance of fiber reinforced concrete pier, four scaled piers whose material is reinforced concrete (RC), carbon fiber reinforced concrete (CFRC), polypropylene fiber reinforced concrete (PPFRC) and hybrid fiber reinforced concrete (HFRC) respectively have been tested under dynamic and static hydraulic servo testing system. The hysteretic curves, dissipating capability, residual deformation and ductility of each specimen are compared and studied. Experimental results indicate that the residual deformation of specimen PPFRC is not as good as CFRC, but it has well ductility. The specimen HFRC possesses the characteristic of small residual deformation and well performance of material dissipation and restoration ability. The dissipating ability of HFRC, CFRC and PPFRC are increase by 12%, 8% and 6% respectively as compared with RC. The HFRC has the best seismic performance due to small residual deformation, good restoration ability and ductility.
Seismic Active Nonlinear Control of an Isolated Highway Bridge
Authors: Ning Jing
Published: August 2013

Active control and passive base isolation strategies are exerted on one continuous isolated prestressed concrete bridge. The goal of this study is to check the applicability of the LQR control law on the isolated continuous or rigid-connection type bridge, to find a more effective control strategy when nonlinearity is introduced. A spaced frame finite-element model is developed by a MATLAB program coded by the author, its validity is checked through comparisons with a sap2000 model. In this program, the nonlinearities of 3 different columns and 5 isolators are considered with their bilinear force-deformation relationship. the factors such as the control devices, sensors, and the corresponding noises and time delay are all considered in the model. Model reduction technique was applied to set up the controllers. The seismic response measurements and regulated outputs are adjusted to optimize control effects.
Study on Characteristics of Dry Friction Plate-Reset Spring Seismic Isolation System
Authors: Chu Jian Yu , Ge Nan , Chen Ling Li , Zhao Shi Yong
Published: August 2013

The seismic dynamic responses on two buildings with the vibration isolation system have been evaluated and the results show that the dry friction plate-reset spring isolation system is apparently effective if the reasonable parameters could be obtained by optimization. The maximum inter-storey drift could be drastically decreased by about 80% at base storey or about 60% at top storey. The elastic coefficient of the reset spring should be larger than the lower limit in order for the effective reposition ability of the system. On the other hand, the influence of the vertical seismic action to the horizontal dynamic response is so small that it could be neglected.
Analysis for Seismic Responses of Continuous Girder Bridge under Strong Near-Fault Earthquake Level
Authors: Li Xin Le , Dou Hui Juan , Shen Dan
Published: August 2013

In order to explore the safety performance of continuous structure bridge near fault zone, a typical three spans continuous girder bridge of highway was selected to study the structural seismic response. The finite element model of whole bridge considered the force characteristics of bearing and pile-soil interaction was constructed. Typical near-fault records were selected from the important earthquake events. Several artificial waves characterized with the soil type in bridge site were simulated and used for dynamic analysis. The seismic performance of continuous bridge was studied by nonlinear dynamic time-history method. Research results indicate that, especially large amplitude pulse effect of near-fault records for strong near-fault earthquake, will significantly enhance the seismic response of continuous girder bridge under the second seismic level (EL2) leads to structure to collapse. The fact that the near-fault effect is not considered in China existing highway bridge seismic design code will increase the destructive risk of structure.
Study on the Effect of Vibration Loads Induced by Bridge Pile Foundation Construction on Adjacent Buried Pipeline
Authors: She Yan Hua
Published: August 2013

Building up the 3D numerical analysis and computing model, force properties of buried pipelines under vibration loads induced by bridge pile foundation construction were researched, to evaluate and control the influence of construction vibration on adjacent buried pipeline. It was concluded that the most adverse position of impact loads effect on pipeline appeared in the upper right and lower left parts of the pipeline closed to the side away from the pile hole about a quarter of an arc. And the peritubular stress distribution curve with the change of the vibration source location were approximately sinusoidal line, parabola and the cosine line changes. Another, under the same conditions, the vibration velocity of ground above the pipeline was significantly greater than the pipeline itself vibration velocity, so through a reasonable assessing and controlling the vibration velocity of ground above the pipeline, it could be made security decisions for buried pipelines. Finally, according to the horizontal spacing of the buried pipeline and shock vibration source, the pipeline grading protection measures were proposed, with achieving better results in engineering application. Research results could provide some evidence both for the force calculation and design construction of the pipeline project, and support for scientific decision-making of the bridge pile foundation construction. It has an important social and economic efficiency.
Synthesis of Strong Ground Motions at Two Rock Stations during the Great Wenchuan Earthquake from a Hybrid Source Model
Authors: Tao Xia Xin , Liu Hai Ming , Wang Li Yuan , Wei Jiang
Published: August 2013

In order to study the characteristics of ground motions at the two dam sites damaged during the great Wenchuan earthquake in 2008, the motions at two observation stations nearby are synthesized in this paper. 30 finite fault based hybrid source models of the great Wenchuan earthquake with magnitude 8.0 is built. The global and local parameters are both generated from the truncated Normal distribution with mean and standard deviation values estimated by a set of semi-experiential calibration laws and from the regional seismo-tectonics, structure of the crust, and seismicity. A representative source model is then chosen from the corresponding response spectrum mostly close to the average one. The result motions are presented, and the characteristics of the time histories, response spectra and the peak accelerations are quite close to the recordings.
Synthesis of Strong Ground Motions at Two Dam Sites during the Great Wenchuan Earthquake
Authors: Liu Hai Ming , Tao Xia Xin , Wang Li Yuan , Jiang Wei
Published: August 2013

The ground motions on two dam sites during the great Wenchuan earthquake with magnitude 8.0, motions are synthesized from 30 finite fault based hybrid source models and inversed regional parameters of source spectrum and motion attenuation. The results show that the peak ground acceleration values are less than those estimated directly from the Intensities Ⅹ and Ⅺ at the two sites, with mean values 259 and 716 gals. The motion at Shapai is much stronger than that at Zipingpu, and the spectrum is also wider than the latter, but the corresponding duration is shorter during the earthquake.
Study of Influences of Soil-Structure Interaction on Seismic Response of Extradosed Cable-Stayed Bridge
Authors: He Guo Jing , Zhang Hai Tao , Lu Jie
Published: August 2013

Taking the Sifang Bridge in Yunnan Province in China as an example, this paper analysis the influences of soil-structure interaction on seismic response of extradosed cable-stayed bridge with response spectrum method. The results show that extradosed cable-stayed bridge has a shorter nature period than cable-stayed bridge, and torsional vibration mode does not happen in the first few modes as the beam has a bigger stiffness. The displacement of the structure will be underestimated if the soil-structure interaction is ignored while the design of some parts is conservative.
Low-Damage Earthquake-Resisting Systems Using Sandwiched Buckling-Restrained Braces and Dual-Core Self-Centering Braces
Authors: Chou Chung Che , Chen Ying Chuan , Chung Ping Ting , Pham Dinh Hai , Liu Jia Hau
Published: August 2013

This paper presents a sandwiched buckling-restrained brace (BRB) and a dual-core self-centering brace (SCB) for seismic resistance. The sandwiched BRB has two components: (1) a steel core plate that carries axial forces and (2) two restraining members that sandwich the core plate with A490 bolts. The proposed BRB can be disassembled easily in the field, which not only means that the core plate can be replaced independently of the restraining members but also provides an opportunity for inspection of the core after a large earthquake. Cyclic tests of five sandwiched BRBs and five BRB frames were conducted to verify their good cyclic performances up to a drift of 2.5%. To minimize residual deformations of structural systems under earthquakes, a new steel dual-core self-centering brace (SCB) with flag-shaped hysteretic responses is developed. The axial deformation capacity of the SCB is doubled by serial deformations of two sets of tensioning elements arranged in parallel. The mechanics and cyclic behavior of the brace are first explained; three 5350-mm long dual-core SCBs are tested and modeled to evaluate their cyclic performances. SCBs exhibit excellent performance up to a drift of 2.5% with a maximum axial load of 1300 kN. Test results showed that the application of dual cores in SCBs reduces significant strain demands on tensioning elements and enables self-centering responses to large deformation. Nonlinear time history analyses were conducted on three BRB and SCB frames to obtain seismic demands under both design and maximum considerable levels of earthquake motions. SCB frames generally exhibit smaller peak interstory drifts and residual drifts than BRB frames.
ARX Model Identification of Shui-Kou Concrete Gravity Dam Based on Seismic Response Data
Authors: Qiao Wen , Liu Guo Ming , He Jin Wen
Published: August 2013

Research on the dynamic characteristics of gravity dam was carried out by adopting ARX model using the seismic response data of concrete gravity dam at Shui-Kou hydropower station. The applicability and effectiveness of single-output-multiple-input ARX model were deduced and verified. A corresponding computer program was developed, and performed to identify the modal parameters of the system. The identified natural frequencies and damping ratios were basically same with the results by traditional peak point pick-up method, and also close to the finite element method (FEM) results. It is indicated that the structure natural frequencies and damping ratios are determined by the characteristics of the structure, the dynamic characteristics identified by ARX model are correct, and ARX model can avoid frequency leakiness when smoothing processing and Fourier transform are conducted in solving process of the peak point pick-up method. The modal identification can be applied to other structures.
Study on the Seismic Performance of Shear Wall Structure with Unidirectional Wall Frames Based on Pushover Analysis
Authors: Yuan Kang , Li Ying Min , Zhang Song Bai
Published: August 2013

In the paper, the equation of stiff characteristic coefficient of shear wall structure with unidirectional wall frames was derived, the deformation characteristics of structure with different wall frames ratio and height were analyzed. Through pushover analysis, the seismic performance of structures were evaluated by interlayer displacement angle and plastic hinge development process. Under earthquake action, increase of wall frames ratio will make plastic deformation increase and maximum interlayer displacement floor move down.The bottom of structure is the weak region, the short wall limbs of wall frames are the weak structural vertical members. The research results show that the wall frames bring adverse effects on the structural seismic performance, so the different design meathods should be carried out according to the overturning moment proportion of wall frames.
Experimental Study on Seismic Failure of High Arch Dam with Scale Model Test on Shaking Table
Authors: Gao Peng Fei , Feng Xin , Zhou Jing
Published: August 2013

This paper presents the experimental investigations into the seismic failure for high arch dam with shaking table test. The similitude scale of high arch dam was studied firstly. Then we developed a like concrete material to simulate the mechanical behavior of the structural concrete in high arch dam. The shaking table tests have been performed on the scale model. The experimental results reveal the failure process of high arch dam with respect to the different earthquake intensities.
Optimization Design of Large Span Cable-Stayed Bridge in High Seismic Risk Zone
Authors: Xiong Zhi Hua , Feng Yun Cheng , Song Song Lin , Wang Jiang Bo
Published: August 2013

To ensure seismic safety of a large span cable-stayed bridge, two alternative pylon shapes and section types were studied. Nonlinear time history analysis was performed in the context. It is found that the A-shaped pylon is much stiffener than the H-shaped pylon in terms of deformation. The steel A-shaped pylon can significantly reduce the seismic demands of the key member including tower drift and moment. A ductile steel link between towers is proposed for the optimization of design in the paper. The A-shaped reinforced concrete tower with ductile steel link was proved to be a relatively balanced plan considering engineering, aesthetic and economic factors.
Experimental Research of Soft Soil Ground Treatment in Yangpu Port by Static-Dynamic Drainage Consolidation
Authors: Yang Yong Kang , Yang Wu , Feng Chun Yan
Published: August 2013

Yangpu Port has inhomogeneous soft soil with the properties of high water content, high void ratio, high compressibility and low shear strength. Based on soft soil ground treatment engineering practice, the geological characteristics are summarized, the ground treatment methods are comparatively analyzed, static-dynamic drainage consolidation method is chosen to treat the soft soil ground, the reinforcing mechanism of vertical and horizontal drainage system are discussed, the design of drainage system, preloading and dynamic consolidation are researched and the surface settlement monitoring, pore water pressure monitoring, side piling displacement monitoring, laboratory soil test and plate loading tests are carried out. The results show that average surface settlement is 1170.8 mm, the physical and mechanical properties of soft soil are improved and the characteristic value of foundation bearing capacity is greater than 120kPa.
Study on the Strengthening Effect of a Typical RC Frame in Wenchuan Earthquake with Attached Substructures
Authors: Huang Sheng Nan , Lu Xin Zheng , Ye Lie Ping
Published: August 2013

This work is based on a typical RC frame that was closed to the epicenter and collapsed during the Wenchuan Earthquake. The seismic collapse resistance of the frame was strengthened by attached substructures, including conventional brace, buckling restrained brace (BRB) and viscous damper. Collapse fragility analysis based on incremental dynamic analysis is implemented for each strengthening scheme to compare their effects and to analyze the influence of critical parameters. The results show that the viscous damper performs better than the BRB, and the BRB performs better than the conventional brace. With the same strengthening parameters, the A-shaped bracing scheme is better than the X-shaped scheme.
Reviews Research and Development of Reinforced Concrete Column Seismic Performance Evaluation
Authors: Xie Yong Ping , Jia Lei , Sun Gang
Published: August 2013

Column is the key member of the seismic structures. Tthe failure of column will cause a large number of casualties. With the development of modern technology, more attention on seismic performance evaluation of reinforced concrete column is paid by academics. The theoretical basis and the concepts of seismic performance evaluation of reinforced concrete column are introduced firstly, and then the existing reinforced concrete column seismic performance evaluation method, the principle and the existing problems are reviewed. Meanwhile the key problems and tendency of research of seismic performance evaluation methods are putted forward.
Research Review of Lateral-Torsional Coupling Considering Soil-Structure Interaction
Authors: Wang Mei Li , Jiang Xin Liang , Wang Yan Hong , Shen Xue Jing
Published: August 2013

Structure would be in different extent of translational-torsional coupling due to the inconsistent of mass center and stiffness center which caused by the irregularity of floor mass and stiffness distribution. At present, the research on seismic response of the eccentric structure was not perfect, especially the translational-torsional coupling response considering soil-structure interaction. This paper briefly reviewed the research status on the lateral-torsional coupling considering soil structure interaction effect and point out several problems existing currently in the field in order to make necessary preparations for analyzing seismic response of eccentric structure more in-depth.
Research about Efficiency for Double Slipping-Surfaced FPS Seismic Isolating System
Authors: Yan Ya Xi , Wang Xing Guo , Liu Qi , Ge Nan
Published: August 2013

Numerical analyzing approach about a novel seismic isolation system, DFPS (Double Slippingsurfaced Friction Plate System), is presented in this paper. It starts from Lagrange equation, its governing equation is similar to that of the FPS friction pendulum system with single slipping surface. Result shows that storey drift resulted from seismic action tend to be even along the height, and interstorey drift, storey velocity and acceleration are significantly decreased on buildings equipped with DFPS system. An optimistic combination of them could exhibit good seismic isolation efficiency. It could reach 70% for μ=0.05, r=3.5m.
Comparison on Seismic Responses of Different Caisson-Soil Interaction Models of a Single Tower Structure
Authors: Peng Tian Bo , Xie Xin , Han Lei
Published: August 2013

In order to study the effect of different models on caisson-soil interaction, a linear model and two nonlinear models are established by finite element software SAP2000. It is found that with the increase of amplitude of seismic wave, the effect of nonlinear properties of caisson-soil interaction is increasingly large. The linear model, however, is not suitable any more under such condition, while the nonlinear models can simulate caisson-soil interaction reasonably.
The Initial Stress Effect on Seismic Performance of Frame Structure
Authors: Liu Fei Le , Chen Chao He
Published: August 2013

For frame structure, due to the uneven settlement of foundation, makes the whole framework of system with initial stress caused by uneven displacement, thus produce unfavorable influence on seismic performance of frame structure. By PMCAD modeling software and finite element module SATWE, analyse the initial stress effect on seismic performance of frame structure.Results show that under the influence of initial stress, the frame structure seismic performance declined.
The Seismic Performance Analysis of Different Forms Beam in High Conversion Structure
Authors: Cheng Xiao Jie , Wang Si Qi , Niu Pei Pei
Published: August 2013

Based on a high-rise frame shear wall structure with high conversion layer, this essay makes compare among three structural models-wide flat beam, SRC and the common conversion beam by using Midas Building, analyzes seismic performance of three forms of conversion beam under gravity effect and seismic effect in consideration of the force of whole structure, force of conversion component and elastic earthquake, analyzes structure model when the wide flat beam is acted as conversion beam with static elastic-plastic analysis (Pushover) method to get the change of the displacement curve of base shear-vertex and the interbeded displacement angle, finds out the weak parts of the structure, comprehensively evaluates the seismic performance of the structure and put forward the key problems and the solutions through looking for performance point.
Effects of Friction Force at Movable Supports on Seismic Performance of a Continuous Beam Bridge
Authors: Wang Chang Feng , Bao Yi Jun
Published: August 2013

The friction force at movable supports has a certain influence on the seismic performance of the continuous beam bridge, so, the friction force should be taken into account in the seismic design of the bridges. The analytic model of the continuous bridge which including the effects of friction force at movable supports was put forward, and the analysis was done with the application of friction element. Through the analysis of a certain continuous beam bridge, the results indicate that the friction force can greatly decrease the earthquake action of this continuous beam bridge. And some suggestion on the bearing selection and the anti-seismic measure were also put forward according to the analysis.
Study on Seismic Performance of Steel Tube Filled with Steel Reinforced High-Strength Concrete Column
Authors: Wang Bing , Ma Lu , Liu Xiao
Published: August 2013

Steel tube filled with steel high-strength concrete composite column which is made by insert into the I-beam inside the steel tube, and then poured into the high-strength concrete, to form a composite structure. It preserves the advantages of concrete filled steel tube and steel skeleton concrete, and has a higher carrying capacitybetter seismic performance and fire resistance, satisfy the needs of modern engineering structures towards large spanhigh-riseheavy-load and harsh conditions direction development, has broad market prospects. This paper mainly from the work principlemechanical characteristics and current situation of the development the three aspects elaborated the present stage study the significance on the seismic performance of steel tube filled with steel high-strength concrete.
Classification of Hazardous Area and Selection of Explosion - Proof Equipment in Iron Steel Company
Authors: Fu Lin Zhi , Li Yu Feng , Li Gang
Published: August 2013

According to the international standard, main problems lying in the process of hazardous zone classification were emphatically analyzed. The source of release was determined in light of its release frequency and duration, namely the continuous source, primary source and secondary source. Considering the effect of release rate, LEL, density, ventilation, obstacles, and meteorological conditions on the classification of the hazardous area, it could be found that the hazardous zone would expand as the release rate increased with lower explosion limit. The gas that was heavier than air covered larger hazardous areas than the lighter gas. Besides, ventilation might speed up the diffusion so as to reduce the scope the hazardous zone; obstacles prevented the diffusion so that concentration of partial gas increased and then the danger level increased; wind at high speed quickened the diffusion to decrease the range of dangerous area. Finally, explosion-proof electrical equipment was selected rationally according to the type of explosive gas and temperature group.
Utilizing GIS and Infoworks RS in Modelling the Flooding Events for a Tropical River Basin
Authors: Othman Faridah , Muhammad Amin Noor Farahain , Mi Fung Lau , Mohamed Elamin Alaa Eldin
Published: August 2013

The large-scale atmospheric circulations and anomalies have been shown to have asignificant impact on seasonal weather over many parts of the world including Malaysia. Malaysia is located in the South East Asia with Southwest and Northeast Monsoons, experiences numerous flooding from year 1926 to 2012.Flood has become a regular disaster in Malaysia which happens every year in different states especially during the northeast monsoon. In December 2006 and January 2007, the Northeast Monsoon brought heavy rain through series of continuous extreme storms that caused devastating floods in the southern region of Peninsular Malaysia particularly to Kota Tinggi, Johor. The storms had occurred in two separate phases in late December 2006 and early January 2007 with atotal precipitation in four days exceeding twice of the monthly rainfall in which some places recorded a higher number. Johor River originates from Mt. Gemuruh and flows through the southeastern part of Johor and finally into the Straits of Johor. The 2006 average rainfall return period is 50-years while the 2007 gives more than 100-years return period. The objective of this study is to perform a flood simulation of the river basin using InfoWorks RS. The rainfall and stream flow data have been used as the hydrological input for the model. There are over 140 nodes representing the cross section throughout the length of the river. From the study, the main finding from the flood mapping process is that the simulated flood depth and flood risk map. Comparison between the simulated flood depth and observed flood depth has been done and shown a reasonable agreement.
Fire Resistance of Web-Slotted Cold-Formed Channel Columns with Non-Uniform Temperature Distributions
Authors: Ma Qi Jie , Wang Pei Jun , Huang Quan
Published: August 2013

The fire resistant behavior of web-slotted cold-formed channel columns with non-uniform temperature distributions was investigated extensively by use of the finite element method in this article. The failure mode of the web-slotted column with non-uniform temperature distributions is very complex with the interaction of the local buckling, the distortional buckling and the global flexural buckling. The ultimate strengths of members with non-uniform temperature distributions are higher than that with uniform temperature distributions of the same highest temperature. In addition the analysis results indicate that the degradation of the material strength makes the dominating factor influencing the fire resistance of cold-formed members. The simplified approach was proposed for the practical design of web-slotted cold-formed columns at high temperatures.
Experimental Study on Silt Liquefaction Characteristics of Different Fines Content
Authors: Luo Qiang , Wang Chun Yan , Li Xue Wei
Published: August 2013

Used the dynamic triaxial apparatus to test 4 group remodeling silt samples of different fines content. Studies the variation relationship on liquefaction resistance of silt with different fines content.And pore water pressure increase of silt with different fines content is analyzed through Exponential function model,the model parameters can be get. The numerical results show that the model has good applicability.
Measurement and Analysis for Gas Emission Characters in Fully Mechanized Caving Face
Authors: Li Xin Jian , Guo Shou Song , He Jun , Mi Xiang Fan
Published: August 2013

According to the practical condition of 3401 fully mechanized caving face in Dayang coal mine, the relationship between strata behaviors, mining technology and stope gas emission are analyzed through real-time monitoring of the support working resistance, advance abutment pressure and gas concentration of working face. It shows that the change of working face abutment pressure has an obvious effect on the regularity of coal face gas emission. The crest value of gas emission falls behind periodic weighting, the lagging time is about one day. Other factors, like coal production processes, daily coal output and advance speed also have close relationships with gas emission.
Excavation Program and Stability Analysis of High-Steep Rock Slope
Authors: Zou Zu Yin , Zeng Yu Sheng , Zhu Zhi Ming
Published: August 2013

Aimed to the problem of excavation and stability for a high and steep rocky slope, with the design excavation height of 90.23m, this paper grasped the engineering geological conditions and physical and mechanical properties of rock mass by such following methods as the field engineering geological survey, measuring, drilling sampling and laboratory test. Based on this, a comparative analysis of two different excavation ways was conducted using the large discrete element program-UDEC. The analysis included the stress-strain law and deformation failure trends of the slope when adopting slow excavation and steep excavation respectively. Moreover, the environmental damage caused by the two excavation ways was discussed. The results show that the slope has a better engineering geological condition and stability. In order to avoid disturbing hills and protect the natural environment, the steep excavation way is suggested for excavation and reinforcement of this slope.
System Dynamics Model of Coalmine Safety Management
Authors: Liu Ye Jiao , Tian Zhi Chao , Huang Dong Mei
Published: August 2013

Based on the dynamic, nonlinear and feedback features of coalmine safety management control process, with the purpose of identifying the complex interdependence relationships of the various elements of coalmine safety management system, system dynamics (SD) is used as a tool to study coalmine safety management and control issues; to elaborate various elements related to safety benefit in the process of dynamic coalmine safety management and the relationships between them. The causal link between those factors and the systematic dynamics flow figure model are established by using the modeling and simulating software which is called VENSIM.
Field Monitoring and Analysis of Hydraulic Soil Slope Frost Heaving Damage
Authors: Qu Xiang Min , Zhong Hua , Wang Xiu Fen , Zhang Bin
Published: August 2013

Frost heaving damage of water conservancy project is widespread. In order to research the failure problems of hydraulic soil slope in dark seasonal frozen soil region, remote monitor and manual observation is carried out combined with field test section layout, which including air temperature, earth temperature, frozen depth, the amount of frost heaving and layered water content. It is researched that the rule of frost heave parameters variation and the damage of soil slope during freeze-thaw cycling. That offers theoretical basis and reference for construction of water conservancy project and guidance for engineering practice.
The Experimental Research of Stabilize Water Delivery on Varying Water Head and Non Pressure Water Tunnel
Authors: Yang Bo
Published: August 2013

The simple and efficient facilities of steady flow and wave elimination-flow-stabilizing plate and wave-eliminating barrier were introduced to study strong water surface fluctuation existing in free flow tunnel in Aan water project, through comparative trial and fluctuation analysis, it could be found that the introduction of steady-flow and wave-elimination facilities could stabilize the flow pattern of free flow tunnel.
Numerical Simulation for Hydraulic Characteristics of MLIS Hydropower Station
Authors: Ding Yuan , Li Tong Chun , Zhou Min Zhe
Published: August 2013

Combined with a multi-level intake structure, using the standard two-equation turbulence model to carry on the three-dimensional numerical simulation for the hydraulic characteristics of this intake .The flow velocity, fluid flow distribution and head loss were analyzed and summarized. The vertical velocity distribution near the intake has been significantly changed after placed stop log gate, the flow velocity of the reservoir surface water near the intake increases significantly, more surface water enter the power plant unit, and the head loss increases greatly.
A Three Dimensional Non-Hydrostatic Numerical Model for Free Surface Flow and Mass Transportation
Authors: Lv Biao
Published: August 2013

A three dimensional non-hydrostatic numerical model is presented based on the incompressible Navier-Stokes equations and mass transport equations. An unstructured finite-volume technique is used to discretized the governing equations with good adaptable to complicated boundary. A conservative scalar transport algorithm is also applied in this model. An integral method of the top- layer pressure is applied to reduce the number of vertical layers. Three classical examples including periodic waves propagating over a submerged bar and non-hydrostatic lock exchange are used to demonstrate the capability and efficiency of the model. The simulation results are in good agreement with the analytical solution and experimental data.
Evaluation of a Distributed Hydrological Model for the Guishui River Basin
Authors: Zhang Jing , Zheng Zhen , Gong Hui Li
Published: August 2013

At present, the application of various hydrological model provides scientific basis for the realization of the water resources management. MIKE SHE model is a classic physically-based watershed-scale model with great advantages in the coupling of surface water and ground water. In the paper, the development history and the present study situation of the distributed hydrological model MIKE SHE and the structural principle of the model is summarized. Furthermore, the ability and applicability of MIKE SHE model was preliminary evaluated for simulating surface runoff in the Guishui river basin in Beijing, China. The impact of different land use practices (the year of 1980 and 2005) on the hydrological response of the selected basin was initially assessed. Overall, the model was able to simulate surface runoff reasonably on annual intervals, representing all the hydrological components adequately.
Characteristics and its Inner Mechanism of the Non-Uniform Sediment Erosion and Deposition
Authors: Ge Hua , Zhu Ling Ling , Zhang Xi Bing
Published: August 2013

The influence of particles characteristics, flow conditions, and composition of riverbed on non-uniform particles pick-up and settling were firstly analyzed in this paper, followed by summaries of the erosion and deposition characteristics and the simple analysis of its inherent mechanism.
The Rationality Analysis of Water-Intaking and Recession about the Integration of Hongfa Coal Mine
Authors: Han Chun , Wang Zhen
Published: August 2013

In order to make the coal exploitation to the healthy and sustainable development, the reasonable deployment of development of coal resources insist on shutting down before the integration, with the principle of the big merging into the small and the inferior merging into the superior. Coordinating to Hongfa coal mine and Luda coal mines In Ding Qi town. By integrating, it can achieve the goal of coal mine safety production and optimization of coal resources, and also can solve some problems left over by history. Through the analysis of local water resources development and utilization, we adopt the method of rainfall to inquire runoff volume and the frequency analysis to reason the results. The results show that either status quo of the level year or planning level years, Ma Daozi village gulley can completely meet the requirements of project for water, Water intake of water is reliable and the impact is not big to regional water resources.
On Ground Settlement Rate Approach of Preloading Method
Authors: Shi Ming Lei , Zhang Rui Kun , Zhang Hao
Published: August 2013

Based on the theory of the Terzaghi 1-D consolidation and the linear compressibility of soil, a rational method for regionalization of recompression and compression in the distribution of the excess pore-water pressure under overloading-unloading was presented. A simple generalized expression of the ground settlement rate applied to insufficient-load preloading, equal-load preloading, surcharge preloading and a time expression of insufficient-load preloading, surcharge preloading relative to equal-load preloading were further derived. The relationship mechanism of settlement rate and time of insufficient-load preloading, surcharge preloading relative to equal-load preloading are discussed based on the same allowed post-construction settlement.
Analysis on Flood Control Unified Regulation of Baiyangdian Wetland and its Upstream Reservoir Group
Authors: Meng Xiao , Wu Xian Bing
Published: August 2013

Baiyangdian wetland is the end of defence line to middlestream and downstream of Daqing river, and its geographic position has decided its critical function to flood control of Daqing river watershed. Therefore, according to the flood regulating ability of Baiyangdian, when the basin occur 50 year frequency flood, joint operation programs have been determined firstly, then the joint operation of Baiyangdian and multi-reservoir in parallel upstream have been presented through the pre-discharge regulation and real-time control discharge regulation, through comparison we determined the optimal combination scheme: joint scheduling with Wangkuai, Xidayang and Longmen upstream reservoirs,the storing water of reservoir can appropriately increased by reservoirs flood control capacity, thus we can not diversion flood to Wenanwa by Xiaoguan floodway, it can reduce the flood diversion of 1.62×109 m3; and compared with conventional scheduling, we can reduce 8.57×108 m3 flood diversion to the East wetland through Zaolinzhuang discharge gate. Therefore the flood flow into the flood diversion area reduced significantly, which have great practical significance to the safety of Baiyangdian wetlands surrounding areas and the important cities and towns downstream.