bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental and FEA Studies of a New Type SMA Viscous Damper
Authors: Wang Wei , Tang Ying Chun , Xu Wei Kai
Published: August 2013

In this paper, a new type shape memory alloy (SMA)-viscous damper is studied by experiment and FEM analysis. As the main mechanical parameters of the damper were obtained by experiment, the damping effect of this composite damper for an eight-story steel frame structure model was discussed by using ANSYS. Both the damped and undamped structures had been analyzed and the vibration responses of this steel framework were compared. The results show that the damper has both the energy dissipating and reset features with the hysteretic loop under cyclic loading-unloading, and the new composite damper has significant damping effect for steel frame structure.
Experimental Study for Seismic Performance of Confined Masonry Structure
Authors: Qu Tie Jun , Wang Yan Ping , Wang Xian Yun
Published: August 2013

A two-story masonry housing model was made in this paper. According to Intensity 7, adjusted Northridge record was selected to be the ground motion input in the pseudo-dynamic test. Pseudo-dynamic test and pseudo-static test were carried out to investigate the seismic behavior of the model structure. The time-history curves of the acceleration, velocity, displacement and restoring force of the structural response were obtained besides the time-history curves of the measuring points of the structure. Also the steel strain of the tie-columns and the hysteresis loops of the structure were obtained. The result shows multi-story confined masonry structures possess superior seismic performance if coordinated with the provision specified in the current compulsory design code and it can continue to use after appropriate dressing under the rarely earthquake.
Implementation and Verification of a Masonry Infill Model Considering the Out-Of-Plane Behaviour
Authors: Chen Zhi Xiong , Hu Ying
Published: August 2013

The response of reinforced concrete buildings to earthquake loads can be substantially affected by the influence of infill walls. Also the out-of-plane failure of the infill can cause heavy casualties. In this article, an improved numerical model for the simulation of the in-plane and out-of-plane behaviour of masonry infill is proposed. First, the proposed model is presented. This is an upgrading equivalent strut model composed of two beam-column type elements, with a node at the mid-span assigned a mass in the in-plane and the out-of-plane direction to account for the inertial forces in both directions. Second, the main results of the calibration analyses obtained with two experiments are presented and discussed.
Simulation of the Seismic Response of Two Different Thick Deposition Layers with Hybrid PSM/FDM Method
Authors: Yan Wu Jian , Shi Yu Cheng
Published: August 2013

In this paper, we simulated two-dimension numerical on the strong ground motion through the hybrid scheme based on the pseudo-spectral method (PSM) and finite difference method (FDM). We based on the same focal depth, and 2 different thick deposition layers are used as models to analyze the relationship between site situation and the peak displacement of strong ground motion. The results show that the hybrid PSM/FDM method for seismic wavefield simulation combines with advantages of the pseudospectral method and the finite difference method and makes up for the disadvantage of the pseudospectral method and the finite difference method, so this method can process well the calculation of the discontinuous medium surface, then the calculation accuracy is similar to the pseudospectral method. Through the wavefield simulation it is known that the range of the seismic wavefield the peak ground displacement (PGD) of the thicker deposition is larger and the influence of the secondary surface wave at the basin edge is more obvious. The thicker deposition amplitude of strong ground motion in the basin is larger and the duration is longer, and the reflected wave of which is more obvious and stronger. However, the difference of the site condition has little influence to strong ground motion in the horizontal direction.
Performance-Based Seismic Design Research of a Super High-Rise Building
Authors: Huang Ling
Published: August 2013

The application of performance-based seismic design method in super high-rise building is studied in this article. The two-stage design process of a super high-rise building is introduced. On the base of proposing the performance standards and objectives of the super high-rise building under earthquake actions of different levels, optimal solution is provided after computational analyses with different softwares. Computational analyses indicate that the design could satisfy all seismic fortification requirements and seismic performance objectives of China's seismic codes in force. The performance-based design idea can provide a reference for similar projects.
Experimental Research on the Seismic Behavior of Enclosing Masonry Walls Simulated the Structure of an Ancient Masonry Pagoda Strengthened with Steel Straps
Authors: Li Sheng Cai , Hu Meng Ji , Qian Yong
Published: August 2013

in this paper, four single-layer masonry wall models in1/8 scale were made by a kind of special bricks on the basis of an ancient masonry pagoda structure. The models are divided into two groups by whether there is a masonry floor in a model or not. Pseudo-static test is introduced to study the seismic performance of four models with a special load control process which is suited to masonry structure. According to the test results, the horizontal bearing capacity and ductility of each masonry walls reinforced with steel straps under horizontal low cyclic loading has been sorted out. Four nonlinear restoring force models are inferred from the experimental results and phenomena under various operating conditions. And the shear capacity calculation formula of reinforced masonry wall models is fit out. The theory and experimental study show that seismic performance of the masonry pagodas strengthened with steel straps has been improved significantly.
Experimental Research on Seismic Response of Heat-Insulating Perforated Brick Full-Scale Walls with Openings
Authors: Liu Chuan Qing , Li Ming Hai , Zhou Guang Chun , Mei Zuo Yun
Published: August 2013

Heat-insulating perforated brick is a new type energy-saving masonry material. In order to investigate seismic response of masonry wall with this new-type brick, a set of quasi-static full-scale cyclic tests are performed. The test results show that this brick owns a good cooperative work system between bearing layer and insulation layer, and vertical axial force is an obvious factor which affects seismic response of heat-insulating perforated brick walls. With the increase of vertical axial force, ultimate bearing capacity increases, however, ultimate displacement can be decreased. In the case of the same axial force, ultimate bearing capacity of the specimen wall with door opening is less than the one with window opening, and the ultimate displacement also is less than the one with window opening.
A Simple Method of Calculating Safety Vibrating Velocity for Single-Layer Masonry Structures in Blasting Construction
Authors: Ai Xin Ying , Xu Li Hua , Yu Jia Li
Published: August 2013

Blasting-induced seismic wave imposes cyclic loadings on adjacent buildings and structures with a combined loading mode of tension, compression, bending, shear and torsion, and it leads to flaking of floated coat, wall cracking, developing of original cracks, etc. This paper presents a blasting case study for the excavation of Wucun tunnel in Xiamen Success Avenue. Field monitoring and numerical calculation of a typical brick masonry structure are adopted to analyze the relationships among the maximum structural displacement, peak vibration velocity of blasting-induced foundation vibration and the change rate of crack width. On the basis of the study above, a method of calculating the safe vibrating velocity for single-layer masonry structure is proposed. Meanwhile, a suggested value of the safe vibrating velocity for single-layer masonry structure is given. All the research results can be useful for the similar construction and research.
Study on the Reinforce Model of Loess Slope
Authors: Wang Juan Juan , Deng Jun Tao , Li Rui E.
Published: August 2013

A pre-stressed lattice frame is an effective structure of reinforced slope. The purpose of this paper is concerned chiefly with the study of the internal force distribution and calculation methods of the pre-stressed anchor lattice frames, and analyzed calculation methods advantages and disadvantages. It is concluded that the design and calculation of the lattice frames should consider the common deformation of the beam and the soil. It can make result especially approaching the force condition of the lattice frames.
Seismic Response Analysis of Tower Crane in Consideration of the Building-Crane Interaction
Authors: Ai Bing , Yang Jia Lin , Pei Zeng Zhuang
Published: August 2013

Interaction between buildings and tower has not been considered in former research..In this paper an integrated seismic analysis method is proposed considering the interaction between the building and the tower crane. A 3D-FEM model of the building and the crane is established with ANSYS software and seismic responses such as the displacement, the acceleration and the stress of the crane are analyzed. The sensitivity of the stiffness of the building on the dynamic responses is also analyzed. The results with consideration of the building-crane interaction, is higher than the results without interaction, and it becomes more significant with the increase of stiffness of the building.
Experimental Study on the Influence of Slab’s Reinforcement on Seismic Bearing Capacity of Beam’s Cross-Section in Cast-In Situ Frame Structure
Authors: Guo Jin Shi , Xie Xin Ying
Published: August 2013

“strong beam and weak column”is the main failure states of reinforced concrete frame structure in the earthquake．This paper is the experimental study of the influence on the virtual cross-section bearing capacity on extremity of frame beam in reinforced concrete，which is affected by some element，such as slab reinforcement，the rigidity of orthogonal beam and so on．Exploring the mechanism of slab and frame work together to determine the width of effective flange，which provides references for structural design and engineering application．
Seismic Performance Research of Steel Girder Bridge with Isolation Bearings and Restrainer Cables
Authors: Zhang Peng , Pang Cui Ping , Yuan Min , Wang Wan Wen
Published: August 2013

The seismic performance of multi-span simply supported steel-girder bridges with sliding and high rocker steel bearings is poor during earthquakes. During the past 20 years, seismic isolation has emerged as one of the most promising strategy for improving the seismic performance of existing bridges. In this study elastomeric bearings, lead-rubber bearings, and cable restrainers are attempted to modify the seismic response of bridges, and theirs effects are analyzed and compared.
The Vibration Control Research of Steel Frame Structure with Shape Memory Alloy (SMA) Cables
Authors: Wang Wei , Xu Wei Kai , Zhang Dong Wei
Published: August 2013

The dynamic response control for a three layer steel frame structure with shape memory alloy (SMA) cables under seismic ground motions was studied experimentally in the paper. A three-story steel frame structure model assembling the diagonal SMA cables was tested in a shaking table. The maximum acceleration and displacement of each layer of the steel frame structure were tested under two cases: assembling with SMA cables or not. The experimental result shows that the maximum acceleration and displacement of each layer are significantly reduced by assembling the SMA cables. The vibration responses of the steel frame structure had been greatly reduced by the great dissipation efficiency for SMA dampers.
Probabilistic Seismic Capacity Models for RC Bridge Columns
Authors: Zhuo Wei Dong , Zeng Wu Hua
Published: August 2013

Reinforced concrete (RC) columns are the vital members in bridge under the action of earthquake. In this paper, a modified Park-Ang damage model with nonlinear combination of the deformation and the hysteretic energy is proposed as a measure of RC bridge columns damage. The nonlinear combination coefficient of the modified model has been calculated based on the 151 cyclic test results of flexure dominant reinforced concrete columns. In additional, the correlation between performance levels and the values of damage index is presented. It is suggested that the scatter of the modified model at different performance levels is significantly reduced compared to the original Park-Ang damage model. At last, the probabilistic capacity models for RC bridge columns are applied to perform a damage analysis.
Seismic Performance Assessment of Long Span Continuous Rigid Bridge
Authors: Jin Qi Wen , Wang Tong Ning , Sun Yi Li , Hu Zhao Tong
Published: August 2013

Based on the theory of cantilever construction, combined with a three cross continuous rigid frame bridge, choosing the biggest cantilever stage, side span cross fold stages, middle span cross fold stage and complete bridge stage as the research object. Considering the pillar-soil function, making the seismic elastic-plastic response calculation. Getting the result that, during the earthquake, pillar-soil function can improve the flexible extension ability of the bridge structure so as to get better resistance seismic capacity. Internal force of the construction stage gradually reduces along the bottom pier, the middle pier and the top pier. Along the bridge, the maximum bending moment appears at the biggest cantilever stage. Horizontal to the bridge, the maximum bending moment appears at the side span cross fold stages. Plastic areas develops quickly during pier bottom and pile top, the crack is obvious; Plastic hinge first appears in the pile foundation, consuming earthquake energy through its plastic deformation so as to reduce the earthquake impact of pier. We should try to avoid plasticitys appearing in the pile foundation during the design, which will provide convenience for the follow-up maintenance.
Dynamic Buckling of 50000m3 Vertical Storage Tanks under Seismic Excitation
Authors: Ying Sun , Sun Jian Gang , Cui Li Fu
Published: August 2013

To study the dynamic buckling characteristics of storage tank subjected to three-dimensional seismic excitation, selecting 50000m3 large vertical floating roof storage tanks as research object, the base isolation system was introduced and allowing for the impact of floating roof. The finite element models of non-isolation and base isolation storage tank were established respectively by ADINA. The seismic responses of these two types of storage tank were calculated and the numerical solutions were compared. The results indicate that the dynamic buckling modes of these two types of storage tank system belong to plastic buckling; base isolation measure can effectively increase the critical load value of dynamic buckling and plasticity yielding, the improve rates up to 38% and 60% respectively. The effectiveness of the base isolation can be verified from the angle of buckling.
Seismic Performance of Inclined-Column Transfer Structure of Frame-Supported Short-Leg Shearwall with Varied Ratio of Short-Leg Shearwall Section Height to Thickness
Authors: Qi Yong , Wang Fang , Liu Xiao Feng
Published: August 2013

Three inclined-column transfer floor structures of frame-supported short-leg shearwall are tested under vertical loading and horizontal cyclic loading to analyze the influence of leg-thickness ratio (LTR) on the seismic performance of inclined column-shaped transfer floors. The failure process and patters, bearing capacity, hysteretic characteristics, stiffness degradation, deformation and ductility are analyzed in detail. The test results show that the force characteristic of inclined column-shaped transfer floor structure is similar to a simple truss, and leg-thickness ratio of the top short-leg shearwall has important implications to the transfer beam performance; if the design is reasonable, the inclined column-shaped transfer floor structure has a good ductility, multi-channel seismic line of defense and better seismic performance.
Hysteretic Behavior on Connection Node between Partially Encased Concrete Column and Steel Beam
Authors: Zhao Gen Tian , Feng Chao , Wang Liao Yang
Published: August 2013

In this paper, the seismic behavior of partially encased concrete columns and steel beam connection are studied, which contains 4 different structures of beam-column joints. By applying a low cycle loading, the failure modes and the strain distribution of each connected component plate domain were studied. The effect of the end plate thickness, stiffened plate, and back plate on the node bearing capacity, stiffness and ductility was analyzed. The bearing capacity of the specimen is improved with the end plate thickness increases, and a lot increased with setting the back plate.
Study of Seismic Design Method for Slope Supporting Structure of Soil Nailing
Authors: Ma Tian Zhong , Zhu Yan Peng , Lai Chun Jing , Meng De Ju
Published: August 2013

Slope anchorage structure of soil nail is a kind of economic and effective flexible slope supporting structure. This structure at present is widely used in China. The supporting structure belong to permanent slope anchorage structure, so the design must consider earthquake action. Its methods of dynamical analysis and seismic design can not be found for the time being. The seismic design theory and method of traditional rigidity retaining wall have not competent for this new type of flexible supporting structure analysis and design. Because the acceleration along the slope height has amplification effect under horizontal earthquake action, errors should be induced in calculating earthquake earth pressure using the constant acceleration along the slope height. Considering the linear change of the acceleration along the slope height and unstable soil with the fortification intensity the influence of the peak acceleration, the earthquake earth pressure calculation formula is deduced. The soil nailing slope anchorage structure seismic dynamic calculation model is established and the analytical solutions are obtained. The seismic design and calculation method are given. Finally this method is applied to a case record for illustration of its capability. The results show that soil nailing slope anchorage structure has good aseismic performance, the calculation method of soil nailing slope anchorage structure seismic design is simple, practical, effective. The calculation model provides theory basis for the soil nailing slope anchorage structure of seismic design. Key words: soil nailing; slope; earthquake action; seismic design;
A Review of the Seismic Performance for FRP Reinforced RC Frame Joints
Authors: Xie Zhi Hong , Zhang Jian Hong , Liu Li Sha
Published: August 2013

Reasonably effective methods of FRP strengthening can dramatically improve the ultimate bearing capacity, ductility and seismic performance of reinforced concrete frame joints. This paper, based on domestic and foreign experimental research and finite element numerical simulation which are working at improving bearing capacity and seismic performance of reinforced concrete frame joints, analyzes mechanism and performance factors of RC frame joints reinforced with FRP material, concludes with basic ideas and methods of FRP material RC joints, together with the direction of continuing studies.
The Seismic Behavior of Pseudo Strain-Hardening Cemetitious Composites Coupling Beams with Polyvinyl Alcohol Fiber
Authors: Park Wan Shin , Eom Nam Yong , Kim Sun Woong , Jang Young Il , Yun Hyun Do
Published: August 2013

This paper addresses the seismic behavior of pseudo strain hardening cementitious composite (PSH2C) coupling beams with different failure modes in hybrid coupled shear wall. Test variables included the ratio of steel coupling beam strength to beam-wall connection strength. The results show that Specimen PSH2C-SCF exhibits a better stable behavior in comparison with Specimens PSH2C-SBVRT and PSH2C-FCF.
The Impact of Infilled Wall on Seismic Performance of Frame Structure
Authors: Liu Xi Ping
Published: August 2013

In accordance with damages of infilled wall frame structures in Wenchuan earthquake, the current 2010 version of "Seismic Design Code of Building" is attached herewith increasing significance to infilled wall, which switches "consider the impact of infilled wall on seismic performance of frame structure and avoid main structure destruction caused by setting infilled wall unreasonably " from a general provision into a mandatory provision, however, a specific quantitative description on the impact of infilled wall on seismic performance of frame structure is still absent. The impact of infilled wall on seismic performance of frame structure is analyzed in the paper, and two suggestions pertain to design and research of infilled wall is proposed under current phase: on the one hand, "conceptual design" should be kept on highlighting in the seismic design of infilled wall frame structures; on the other hand, based on the concept of "performance-based seismic design", the idea that infilled wall should be treated distinctively is put forward.
Material Nonlinearity Effects on Dynamic Second-Order Effects of Slender RC Columns under Seismic Load
Authors: Han Feng Xia , Qing Liu , Xia Han
Published: August 2013

This study investigates the influence of material nonlinear in slender reinforced concrete (RC) columns dynamic second-order effects under seismic load. The stiffness reduction coefficient is adopted in this paper. To identify the significance of various effects in terms of the dynamic second-order effects of the slender RC columns, nonlinear dynamic analyses are conducted for different periods and stability coefficients of simulated models with rare occurrence earthquake. On the basis of the obtained numerical results, the influence of material nonlinear for dynamic second-order effects are reviewed.
The CMP Cross-Correlation Method and its Limitation
Authors: Lu Jian Qi , Li Shan You , Li Wei
Published: August 2013

The MASW method is robust in determine shear wave velocity of shallow site because the dispersive properties of Rayleigh wave was dominated by shear wave velocity of subsurface. Using this method, an assumption that the earth model is one dimensional and horizontal layered must be put to simplify the real earth model without considering the lateral variation. However, it is not always the truth. In order to obtain a two dimensional S-wave velocity profile of shallow site, a CMP cross-correlation (CMPCC) method was proposed by Hayashi and Suzuki (2004) to approximate two dimensional S-wave velocity profile with one dimensional inversion procedure. In order to verify its approximate resolution, a horizontal stepped layer model and a dipping layer model were chosen. The synthetic wave fields of the two models were calculated by staggered grid finite difference method. Result shows that this method can only be used to approximate horizontally stepped layer model and cannot be used to approximate dipping layer model.
Offshore Sea Airport Revetment Structure Foundation Liquefaction Analysis
Authors: Zhao Jie , Yun Gao Jie , Wang Gui Xuan
Published: August 2013

This Earthquake liquefaction analysis of total stress method is often used, but the total stress method does not consider the variation of pore water pressure and the process of development of the liquefaction over time. Using two perspectives which the total stress method and effective stress dynamic analysis given liquefied range of offshore airport foundation under the earthquake , and giving recommendations for ground treatment methods.
Effects of Epicentral Distance and Seismogenic Fault Distance on Seismic Damage of Dams in Wenchuan Earthquake
Authors: Liang Haian , Jing Li Ping , Yang Ze Ping , Li Yong Qiang
Published: August 2013

Epicentral distance and seismogeonic fault distances as crucial ground motion parameters of attenuation relationship are widely accepted indexes for rapid assessment of seismic scenario. Based on the geographical information of 379 heavily damaged dams in Wenchuan Earthquake, 2008, China, the distribution of damaged dams is analyzed statistically. Specifically, the correlation of damage rate & epicentral distance and that of damage proportion & seismogenic fault distance are compared, and corresponding equations are developed respectively using least square methods. The investigation shows that there exists a closer relationship between seismic damage and seismogenic fault distance than between damage and epicentral distance for Wenchuan earthquake. It is concluded that the index of seismogenic fault distance is more applicable to large earthquake, while Epicentral distance is a more accurate index for small and mid-level earthquakes.
Study on the Suitability of Seismic Isolation Technologies for Rural Buildings
Authors: Zhang Guang Hui
Published: August 2013

Rural buildings are subject to the most serious damage and the highest collapse ratio in earthquake disaster. It is urgent at present to develop seismic isolation technologies applicable to rural buildings under current rural economic conditions of China. Through comparing the existing domestic seismic isolation technologies in respects of the acquisition difficulty level, price and friction coefficient of material and the placement of sliding material, and analyzing the result of simulated shaking table test respectively with the gravel foundation isolation technology and the gravel sliding isolation technology, this paper points out matters needing attention during the development of seismic isolation technologies for rural buildings.
Research on Analysis Method of Seismic Response of Long Span Cable-Stayed Bridge
Authors: Li Xu , Wu Sheng Ping , Fang Zhen Zheng
Published: August 2013

The response of the long-span cable-stayed bridges under seismic load is complex. Reasonable methods is very important to analyze the seismic performance. In this paper, a practical project is taken as research background which is double pylon cable-stayed bridge with main span of 416m. Two artificial seismic waves and two seismic records were selected to analyze the seismic behaviors by the response spectrum method, time history analysis method and power spectrum method. The result shows that seismic responses of the girder and main tower are basically identical under the effect of artificial seismic wave. The response spectrum analysis results of them are between the other two methods under the effect of the natural seismic wave. For stay cable, time history analysis results has great difference compared with results of other two methods. Therefore, different methods should be choosed base on specific circumstances to analyse the earthquake response of this structure.
Bridges in Fire: State-of-the-Art and Research Needs
Authors: Liu Yong Jun , Liu Qi , Song Fu Chun
Published: August 2013

During lifetime of a bridge, it may be subjected to many hazards, in which one of the most severe hazards is fire. In recent years, due to rapid development of transportation systems, as well as increasing transport of hazardous materials, bridge fires have become a concern. Bridge fires caused by crashing of vehicles and burning of gasoline are much more severe than building fires and are characterized by a fast heating rate and a higher peak temperature which could lead to bridge collapse. Bridge failures during a fire can result in the disruption of commerce and services, and most importantly the loss of human life. This paper presents an overview of bridge fire incidents, provides a state-ofthe-art review of studies on bridges in fire, and identifies the research needs in the future for protecting critical bridge structures.
Theory Study on Similitude Design of Shaking Table Tests of Earthquake-Induced Landslide
Authors: Lai Chun Jing , Zhu Yan Peng , Wang Chun Qing , Ma Tian Zhong
Published: August 2013

Based on analysis of characteristics of earthquake-induced landslides and summary of main factors of controlling earthquake-induced landslides, three main factors which are seismic parameters, topography and landforms features and engineering properties of soil are considered the main factor affecting on earthquake-induced landslides. These factors should be focused on to meet the similitude ratio design of the dynamics of landslide in Shaking table test design. Based on study of dynamic similitude law of landslide, the method of changing model soil specifications is used to prepare the model soil which is in accordance with the maximum shear modulus of prototype soil. Also, the engineering properties similitude of model soil is checked by the method of shear wave velocity similitude. By taking the theory of vibration behavior theory of similarity and dynamic failure similar, the formula of dynamic parameters similitude ratio was got. This formula provides calculating methods using shaking table test to simulate earthquake induced landslide.
Influence of Pendulum on Vibration Response of Transmission Tower under Wind Load
Authors: Lin You Xin , Fu Xing , Li Hong Nan
Published: August 2013

In order to study the dynamic response of transmission tower equipped with a pendulum damper induced by wind load, a simulation, considering wind load acting on pendulum, is implemented. Deducing the vibration equation of transmission tower-pendulum system induced by wind and utilizing harmony superposition method and Davenport power spectra to simulate fluctuating wind load, time history analysis based on Newmark β step-by-step integration method is conducted to study the influence on displacements of pendulum and tower tip in the two conditions of considering and unconsidering wind load acting on pendulum damper. It can be found that pendulum displacement would be underestimated, and tip displacement would be overestimated if we dont consider wind load acting on pendulum.
Multi-Type Finite Elements Hybrid Model for Simulating Global Behavior of Reinforced Concrete Frames in Fires
Authors: Liu Yong Jun , Liu Yang Yang , Bi Ran , Zhou Jing Hai
Published: August 2013

In general, reinforced concrete frames have excellent fire resistance properties, but more and more concrete buildings collapsed in fires. The majority of past research work on the response of concrete building to fire has looked at the effects of fire upon individual structural members, and most commonly when subjected to heating from standard fire tests. At present, the fire behaviors of whole reinforced concrete frame are not adequately understood. There is a great need for development of models which consider the effects of fire on the whole structure under more realistic heating regimes. There is also a fundamental requirement for further large-scale testing of concrete structures, to observe the behavior of whole concrete structures in real fires and also for validation of advanced computer analysis tools. Accuracy and efficiency are two major concerns in finite element analysis of structural response of concrete frames in fires. In this paper, a multi-type finite elements hybrid model for simulating structural behavior of whole reinforced concrete frames in real fire is suggested.
Shanxi Highway Earthquake Disaster Risk Division Based on GIS
Authors: Li Peng Li , Tian Wei Ping , Han Min , Peng Ran
Published: August 2013

The paper take Shanxi Province as the object of study, through the analysis of the type after shaking the Shanxi Province road secondary geology disaster, the distribution rule and send the disaster mechanism's investigation and the analysis, the Shanxi Province earthquake secondary disaster mainly have the pitch geology disaster, the mud-rock flow disaster as well as the roadbed cave in three broad headings. The paper selection earthquake intensity, the terrain slope, the ground type, the surface cutting density, the surface cutting depth, the vegetation, the drainage density, the rainfall amount and so on take the pitch geology disaster's risk evaluating indicator, established three has ordered by type lives the geological disaster risk evaluating indicator system and the rank division system, and determined each influencing factor the weight. Has completed each influencing factor topic chart level using the GIS technology, through the GIS spatial analysis function, the superimposition has completed each kind of disaster's risk factor index chart. Finally can obtained the figure of shaanxi roadbed disaster risk classification.
Comprehensive Mitigation and Control of Rockfall Hazard
Authors: Shen X. H. , Zhang L. X. , Chen D. G. , Lü Q. , Wang F. J.
Published: August 2013

Rockfall is one kind of important geohazard. Due to its complexity of trajectory, it is difficult for treatment designing in slope engineering. This paper employs a methodology for estimating rockfall trajectory using a series of established formulas, and then discusses the advantage and also disadvantage of existing controlling measures for rockfall mitigation. Based on site survey, calculation results and site geologic conditions, various protective structures such as retaining walls, safety net system and vegetation or plants, are suggested to mitigate and control the rockfall hazards comprehensively, which illustrates great advantages in technology, economics and environmental protection in a case study of rockfall hazard treatment. The idea and methodology presented herein is referential for similar slope problems.
FDS Simulation and Consequences Forecasting of LPG Storage Tank Pool Fire and Explosion
Authors: Zhang Miao , Song Wen Hua , Li Qing Gong , Chen Zhen
Published: August 2013

This paper analyzes the fire explosion risk of liquefied petroleum gas (LPG) storage tank through methods of model calculation and simulation. A large crude oil reserves library in Tianjin is the main study object in this paper, the fire process for the storage tank pool fire is simulated using the fire simulation software FDS, which produces the development of fire and the change of the radiation intensity in the case of fire. And the damage degree of explosion accident consequences has been calculated quantitatively by the vapor cloud explosion model, which obtains the casualties radius and property damage. Study results provide reference data and theoretical guidance for fire protection design and fire fighting tactics in LPG storage tank area.
Monitoring Model for Dam Seepage Based on Lag Effect
Authors: Wang Shao Wei , Bao Teng Fei
Published: August 2013

The traditional dam seepage monitoring model is based on the relationship of seepage elements with the upstream reservoir water level and rainfall, which includes the impact of base value, this model will weaken the effects of reservoir water level variation and rainfall on the variation of seepage elements, especially under the condition of high reservoir water level and smaller head fluctuation, so components separated by this model are not normally the practical. Based on the theory of unsteady seepage, the lag effect function has been introduced into the seepage monitoring model to take the lag effect of reservoir water level variation and rainfall into account, and the daily variation monitoring model of dam seepage elements is established. Case studies are in good agreement with original observations, so the proposed model can be used in the daily variation monitoring and forecasting of dam seepage elements.
Transport Mechanism of Water and Sediment in Yangtze River Estuary North-South Branch Bifurcation
Authors: Yang Yun Ping , Li Yi Tian , Wang Dong
Published: August 2013

This Base on the the field data of water and sediment of Yangtze River estuary bifurcation in 2004 fiood season and 2005 dry season, the features and process of water and sediment transport Was analyzed by decomposition mechanism.The law of velocity of residual currentsediment transport rate per unit width and tidal punping effect,which in different season and tide,are focused on.The relationship between the features of water and sediment and channel wvolution was discussed through the results of the discharge of water and sediment,which is a basis in the future study of discharge of water and sediment in estuary.
Study on the Simulation of Anti-Flood Spiral Pile-Driven Process
Authors: Pang Hong Chen , Wang Yu Xing , Tang Yan Qin , Huang Han Dong
Published: August 2013

Pile-driven operation is the essential means of flood control and river harnessing. Anti-flood Spiral Pile is an innovative flood fighting and rescue equipment. Based on the experiment, established the spiral pile finite element model in FEM method and constructed the soil model with SPH smooth particles, set the keywords and parameters by using LS-DYNA softwares own processor, and then, the large deformation (soil extrusion and shearing status, etc.) and stress conditions be simulated truthfully. With reference to the experiment, the simulation results of SPH method with ALE method was contrasted, which could provide a reliable reference and scientific basis for the subsequent analysis and design of the spiral pile.
Numerical Simulation on Undulatory Flow of Swimming Fish
Authors: Zhang Xu , He Xiu Bin
Published: August 2013

A numerical simulation is carried out to investigate the unsteady flows over a swimming fish. The three-dimensional incompressible Navier-Stokes equations are solved using the finite volume method with artificial compressibility and dual time stepping approaches on unstructured moving grid. A realistic fish-like body is modeled, which undergoes undulatory swimming in a straight line. Both inviscid and viscous flows have been simulated to study the flow structures.
Experimental Study on the Aerator's Air Hole Area, Cavity Length and Backwater in the Cavity
Authors: Rong Yan , Xu Yi Min , Qiao Liang , Ma Guan Bo , Shen Chun Ying
Published: August 2013

It cannot be ignored that the concrete surface of the discharge works may be seriously damaged caused by high speed flows. However, aerator installed at the bottom of spillway or tunnel is usually used to solve this problem in engineering. The function of the aeration facilities are influenced significantly by the cavity length and the backwater in the cavity, for the air holes will be blocked if there is a serious backwater in the cavity and so the aeration facilities will be ineffective. This thesis aims to study and analysis the relations among the air hole's area, the cavity length and the backwater depth in different conditions by the model experiments. The experiment results indicate that, the area of the air hole is a key factor to influence the jet cavity after the aerator. Aerator's body size and the chute slope affect cavity size and backwater in it greatly. For the chute with small bottom slope, more attention should be paid to the backwater in aerator's cavity.
Research on Water Migration Characteristics of Hydraulic Soil Slope during Freeze-Thaw Process
Authors: Wang Xiu Fen , Zhong Hua , Zhang Bin
Published: August 2013

Frost heaving damage of water conservancy project is widespread. Water migration is the principal factor, which influences the frost heaving characteristics of soil. In order to research the failure problems of hydraulic soil slope in dark seasonal frozen soil region, the layered water content is observed. It is researched that the rule of water migration characteristics. That offers theoretical basis and reference for construction of water conservancy project and guidance for engineering practice.
The Numerical Analysis of Gravel Pile Reinforcing Liquefiable Silt
Authors: Ruan Dong Hua , Zhang Yan Mei , Wang Zhen , Huang Chun Xia
Published: August 2013

A three-dimensional numerical simulation about gravel pile reinforcing liquefiable silt foundation was built, and the influence of gravel pile on the liquefiable silt anti-liquefaction was discussed. Results show that under seismic load, gravel pile has obvious cushioning effect, and compared with natural foundation, the maximum horizontal vibration acceleration of the gravel pile composite foundation surface layer is obviously decreased; drainage effect of gravel pile is very significant and the larger is the gravel pile permeability coefficient, the better is the drainage effect; as earthquake intensity largens, silt liquefaction scope increases; of both natural foundation and composite foundation, the pore pressure ratio variation with depth is that the middle is bigger than the top and bottom, and middle layers are more likely to be liquefied; the greater is the seismic acceleration, the larger is the shear stress.
Design and Comparison of Catenary and Taut Mooring Systems for New Concept FPSO IQFP in Shallow Waters
Authors: Wang Tian Ying , Yang Li Jun , Xu Zhi Gang , Liu Jin Kun
Published: August 2013

In order to design an effective and economical multi-point mooring system for the new concept FPSO IQFP (fillet inverted quadrangular frustum pyramid shaped FPSO, presented by the lead author), the effects of the mooring parameters on the performance of catenary mooring system and taut mooring system were investigated according to the initial design plans given in advance according to the steady environment forces and practical experiences. Then, the optimal mooring systems were developed on the basis of the static analysis results combined with the coupled calculations in time domain. Finally, the merits and demerits of the two mooring schemes were compared based on the mooring and static characteristic parameters as well as the curves of restoring force against horizontal displacement of the catenary and taut mooring systems respectively. The results verify that the taut mooring system is preferable to the catenary mooring system for IQFP deployed in shallow waters.
Experimental Study for Irregular Wave Uplift Force on Upper-Structure of Offshore High-Piled Wharf under Wave-Current Interaction
Authors: Yan Shi Chang , Chen Xiao Ting , Chen Guo Ping , Ye Yue Fei
Published: August 2013

This paper studies uplift force on upper-structure of offshore high-pile wharf under interaction of wave and current through indoor wave physical model test. The research takes various wave elements, wave incident angle and the angle of wave and current and other factors into consideration and launches a series of test to analyze the influence of different factors on wave uplift force. The research result shows that with the increase of wave incident angle the wave action width decreases which results in the gradually decrease of wave uplift force. When wave and current are in the same direction, the total wave uplift force decrease; when wave and current are in opposite directions which leads to the reduce of wave incident angle while results in the increase of wave height, the total wave uplift force increases; when wave obliquely incidents with the action of current, the factors influencing uplift force consist of wave obliquely incident action and current.
Three-Dimensional Wave Basin Model Test for General-Purpose Wharf in Jinghai District of Jieyang Harbor
Authors: Yan Shi Chang , Lin Shang Fei , Chen Guo Ping
Published: August 2013

Three-dimensional model test in wave basin is launched to obtain the designed wave elements for the harbor, and the distribution of wave height in port and the overtopping on wharf surface in the project of all-purpose wharf in Jinghai district of Jieyang Harbor. The length scale of the physical model is 1:100. To compare the wave height and overtopping in different layout schemes under the same experimental condition, the optimal scheme is scheme 2 in which the wharf structure of 1 # berth is arranged in the east and the breakwater is extended about 580 meters. Meanwhile, the effect of navigation channel on wave transmission and wave condition in harbor is briefly discussed.
Numerical Simulation Study on the Submerged Pipe Depth of Air Bubbles Breakwater
Authors: Zhang Cheng Xing
Published: August 2013

The numerical simulation of air bubbles breakwater was presented in this paper. The two-phase fluid of water and air was assumed as a variable density fluid. The numerical models were developed by FLUENT in order to explore the air amount scale in the system of air bubbles breakwater . The impact of submerged pipe depth on the wave dissipating performance of air bubble breakwater was obtained, which illuminated that The submerged pipe depth D is deeper, the wave dissipating performance of air bubbles breakwater is better. Furthermore, the effect of air amount and the incident wave periods on the performance of the air bubbles breakwater was analyzed.
Retaining and Protection Design of One Complex Building's Deep Foundation Excavation
Authors: Wu Ruo Yang , Li Wei Bin , Zhang Zhong
Published: August 2013

A complex building's excavation has the characteristics of wide excavation area, irregular shape, and partly being surrounded by dense adjacent buildings. In addition, the excavation depths vary in different areas. According to the characteristics of the project and the situations of the construction plan, two schemes are discussed in this paper. Through the discussion, the relations between internal force of the retaining structure, the deformation, the surrounding settlement and the bracing structure are analyzed in details.
Innovation on Commercial Concrete Floor Slab Construction Technology
Authors: Li Yong , Guan Chang Sheng
Published: August 2013

Take Shunjing International Plaza project as an example, investigate on the status of large areas of cast-in-place pumping commercial concrete floor construction , In view of common quality defects of early shrinkage cracks, innovate pumping concrete construction technology, namely, set the sub-grid band, strictly control the quality of raw materials and the concrete mix ratio, rub repeatedly both manually and mechanically, enhance early maintenance, adopt appropriate technical intermittence process and so on, After the engineering applications, the technology had guaranteed the concrete quality smooth and dense, eliminated the early cracks of the concrete.
Construction Technology and Quality Control of Dry Hanging Method for Stone Material
Authors: Sun Kai , Li Jing Yang
Published: August 2013

This article introduces the application of dry hanging method of stone material on the wall, elucidates dry hanging construction technology and construction process, gives a description of quality control key points of dry hanging method, analysis the common quality defects during construction and provides some corresponding prevention methods and amending measures to ensure the project quality and the decoration effect, which provides references to enhance construction quality management of stone material facing construction.
Preparation and Application of a Self-Thermal and Insulation-Ribbed Floor
Authors: Zhou Shuang Xi
Published: August 2013

With the cementitious composite formwork without being removed, steel wire frame and formwork technology, a self-thermal and insulation-ribbed concrete floor is made. Through the tests of bend-bearing capacity of self-thermal and insulation-ribbed floor, the results show that the loads of the self-thermal and insulation-ribbed floor meet the limits on deflection requirements according to the design of concrete structures. Besides, the floor has a better thermal and soundproof function compare to the ordinary concrete beam and slab, and its comprehensive cost of construction is low.
Analysis of Common Problems with Insulation Technology Sticking Polystyrene Board
Authors: Chen Hui Yu , Tan Fu Wei
Published: August 2013

That of the problem of fire, falling prevention, water seepage usually consists in the insulation technology sticking polystyrene board plate. It can avoid fire hazard through the selection of excellent insulation materials and proper construction technology and setting fire barrier .It is mainly to control the construction process for falling prevention and focus on structural details for water seepage prevention.