bluuebunny/crossref_metadata_2025 huggingface dataset:
The Interval Estimation about Confidence of the Reliability Index
Authors: Li Zhang Miao , Kou Xin Jian , Huang Jian Yong
Published: June 2012

The theory of statistical inferences is the base of the reliability analysis. The results of inferences can not be believed unquestionably because the data sample could not involve whole information about the parent distribution. In engineering, it is reasonable to estimate the precision of inference results concerning the reliability index. Therefore, the randomness of reliability index is discussed in this paper. The confidence interval, which is one of the most important concepts in statistics, is employed to express the precision of the reliability index.
Analysis and Prevent Measure for Common Housing Construction Crack
Authors: Yang Su Juan , Wang Hong
Published: June 2012

Introduces common of housing construction damage that result from crack, and analyzes main cause result in housing crack, then discusses how to ascertain cracks’ cause of formation in terms of crack form, and take what proper measure to prevent different cracks of housing construction.
Effect of Alkali on the Impact Toughness of Adhesively Bonded Joints
Authors: You Min , Mei Chun Zhi , Liu Wen Jun , Hu Jing Rong , Wu Ling
Published: June 2012

The effect of the temperature and immersed time of the alkali solution on the impact toughness of the adhesively bonded steel single lap joint under impact loading is studied using the experimental method. The results obtained show that the impact toughness of the specimen increased when the immersed time increased then it decreased as it beyond 3 days. When the immersed time is longer than 72 h, the higher the temperature is, the lower the impact toughness of the joint. The moisture absorption of the adhesive layer with the immersed time was also investigated and it was found that there is a relationship to the impact toughness of the adhesively bonded single lap joint. The epoxy adhesive layer was analyzed with FT-IR and it was found that the hydroxyl enhanced and bonding strength may increase after 72 h immersed in alkali solution.
Investigation of Numerical Modeling for Concrete Corroded by Chloride Ion Diffusion
Authors: Song Wen Jie , Dong Jun , Bai Yu , Dong Fei , Sun Wei Ze
Published: June 2012

For concrete structure lack of enough durability due to corrosion by chloride ion under chlorine salt environment, and based on the Fick’s Diffusion Law, a mathematical model for concrete corroded by chloride ion diffusion is established and studied. Based on Galerkin FEM with weighted residuals, numerically discrete analysis of the models and final finite-difference-discrete format about time are obtained. Comparisons of PDE models between traditional heat conduction and chloride ion diffusion have been done. According to different parameters and APDL in ANSYS, a program for transformation of parameters including initial and boundary conditions is designed, so as to solve modeling by resolving module of heat conduction in ANSYS. A two-dimensional example from references, namely a concrete plate corroded by chloride ion under chlorine salt environment, is analyzed. All the results show the investigation is reliable and feasible for the research of durability of concrete structure under corrosion environment.
Reliability Analysis on Construction Course of Open Caisson Structure
Authors: Zhang Ji Cheng , Yang Jun
Published: June 2012

The numerical model was established using ANSYS software, which took the interaction effect of subsoil and structure into account, the soil was considered as discrete spring elements. The soil’s mechanic parameters were set as random variable, probability analysis was performed on typical construction course of open caisson by Monte-Carlo method, the distribution rule of displacement random variables and their sensitivity to variable factors were studied, and the influence of uncertain factors on open caisson’s sinking attitude was investigated. The analysis model showed good practical value for controlling construction course of open caissons.
Numerical Simulation Analysis on Shear Bearing Capacity Experiments of Cold-Formed Steel Self-Drilling Screws Connection
Authors: Lu Lin Feng , Huang Guang Yin , Fang Wen Qi , Yang Dong Hua
Published: June 2012

Cold-formed steel self-drilling screws connection are imitated to carry out numerical simulation analysis, in which geometric large deformation, materials nonlinear and contact problem are taken into account. From the comparison of computer analysis with experimental results, it comes out that the finite element numerical simulation method is accurate and feasible.
Seismic Damage Analysis of SRHSHPC Frame Beams
Authors: Wang Bin , Zheng Shansuo , Yu Fei
Published: June 2012

Based on the test results of steel reinforcement high strength high performance concrete (SRHSHPC) frame beams, a new seismic damage model of SRHSHPC frame beams considered the strength and stiffness degradation was proposed, which was a non-linear combination of the deformation and accumulative damage. The results can more clearly reflect the laws of strength and stiffness degradation of SRHSHPC frame beams under reversed loading. The study results can supply the theory support for the seismic damage assessment and the establishment of damage-based earthquake-resistant design method of SRHSHPC members.
Investigation and Analysis on Seismic Damage of Historic Timber Structures Caused by Wenchuan Earthquake in Zhaohua Ancient City
Authors: Cheng Lu , Liu Hong Tao , Zhu Xiao Wei , Jia Bin
Published: June 2012

According to the investigation on historic structures in Zhaohua Ancient City, there are a total of 210 historic structures in the city, of which the historic timber structures account for 93.8%, namely 197 in total. In this paper, damage degrees of the historic timber structures have been determined, although the timber structures had not considered seismic design when they were built, nearly 60% of the historic timber structures are of relatively minor damage. Besides, based on the analysis on seismic damage of the historic timber structures, the failure modes of the timber structures have been concluded, namely the tenon pullout or tenon break-off, the pillar break-off, the pedestal slip and the retaining wall damage.
Economic Losses Research of Seismic Damage Based on Grey Correlation and Genetic Neural Network
Authors: Li Xian Zhang , Wang Zhi Tao , Guo Xiao Dong
Published: June 2012

In order to estimate the urban economic losses after earthquakes, builds the prediction model based on grey relation and genetic neural network. According to the grey correlation analysis, screens out the major factor effecting the earthquake losses as input vectors of neural network first, adopts genetic algorithm to optimize the initial weights and bias of BP network and then, solves the problem that the traditional neural network has slow convergence velocity and can not easy to get the global optimum. According to the example, we can get the model that has good forecast accuracy and convergence rate and checks the rationality and effectiveness at last.
Analysis of Seismic Response Influence of High Rise Building Nearby Subway Station in Soft Site
Authors: Long Hui , Chen Guo Xing , Zhuang Hai Yang
Published: June 2012

A two-dimensional finite element model for soil-subway station- high rise building was created based on the representative soft soil site along the Nanjing subway to study the nonlinear dynamic interaction among three parts. The influence of two-layer and three-stride island-type subway station was explored on the seismic response of nearby high rise building. The results showed that the natural frequency of high rise building was reduced apparently because of the existence of soft soil. The displacement angle between the layers of high rise buildings and right swing relative horizontal displacement amplitude between top and bottom was increased when the subway station was located at the left of the high rise building. In the same time, the shear force of the beam end and the moment amplitude on the middle span of the first and second floor of high rise building, the shear force of the column end on the fist layer, the shear and moment amplitude of the middle column end and right side column end on underground layer were all increased, and the increase proportion is even up to 30% on certain areas, which could weaken the seismic performance of high rise building.
Seismic Response Analysis of Subway Station in Tianjin Soft Soil Area
Authors: Yang De Jian , Li Ya
Published: June 2012

In connection with the practical project of Kunminglu station of Tianjin subway Line 3 in soft soil sites, the finite element method model based on soil-structure interaction was established by using ANSYS program. Additionally, this paper analysed the static calculation and the dynamic interaction system of underground soil-structure, obtained the acceleration time histories of seismic response, and concluded that what are mechanical characteristics of subway station structure under the static and dynamic load. Possible damage to subway station brought about seismic response and seismic weak links of subway station structure under the action of horizontal earthquake is analyzed.
Automatic Detection of Damage Level of Structures under the Severe Earthquake Using Sensor Network
Authors: Ikeda Hirotaka , Kawaguchi Takahiro , Oguni Kenji
Published: June 2012

We propose a method to compute the restoring force characteristics and dissipated energy to detect damage level of viaducts for railways and highways, using only acceleration. The acceleration data were measured by accelerometers which were installed on the top and the bottom of the structures. Wireless sensor network is used to compute and collect the data. Using this system, the information of restoring force characteristic and dissipated energy can be created.
Analysis of Sample Survey of Rural Houses in Five Regions of Gansu and Earthquake Damage Prediction
Authors: Zhou Tie Gang , Pan Chang Ming
Published: June 2012

A large number of rural housing data based on field identification of Gansu five surveys were compiled, and the paper analyses the housing situation of Gansu, points out that the technical defects of the current rural housing construction. The mathematical model is established by fuzzy theory which is used to predict the earthquake disaster that may occur under the appropriate intensity of the survey areas in the future. Purpose is to provide the basic data to fully carry out the rural residential seismic safety work, and provide advice and reference for the follow-up to the rebuilding of old housing. It may be beneficial to enhance and improve the areas of rural building seismic performance.
Seismic Isolation Response and Parameter Influence Analysis of Nuclear Power Plant during Great Earthquake
Authors: Liu Wen Guang , Wang Rui Dong , Hua Lei , He Wen Fu
Published: June 2012

In this paper, the behavior of the structure of a pressurized water reactor (PWR) nuclear power plant (NPP) in China, is taken into consideration during a great earthquake especially beyond the design benchmark. The effects of earthquake energy absorption are analyzed using simplified multi-lumped mass system. The effects of site conditions, post yield stiffness, yield force on isolated reactor structure (IRS) are also discussed. The results show that isolation technology can significantly reduce seismic response of the reactor structure and achieve preferable earthquake energy absorption of the IRS beyond the design benchmark during a great earthquake. Earthquake wave characteristics and isolation layer parameters have direct effects on seismic response and the results of parameter analysis can provide reference for a correct and logical design of IRS.
Comprehensive Method of Seismic Damage Assessment of Reinforced Concrete Structures Based on CPM
Authors: Liu Chao Feng , Su Jing Yu , Guo Xiao Dong , Wang Wei
Published: June 2012

In order to improve the accuracy of earthquake damage assessment of reinforced concrete structure, the earthquake damage assessment mutation model and four-dimensional model of seismic damage analysis are established using catastrophe theory. Firstly, internal damage index, number of inelastic cycles, maximum inter-storey drift and energy-concentrated quotient were taken as evaluation factors. Value assignment and standardization of each evaluation index is conducted. The appropriate mutation model is selected to calculate the total mutation value of seismic damage and comparison with the evaluation criteria of seismic damage of reinforced concrete structure, the extent of structural damage is differentiated. Secondly, comprehensive consideration of people's initiative and non-linear characteristics of the system, a four-dimensional seismic damage analysis model is build based on the mutation assessment of earthquake damage. Finally, four different structures are calculated and the results are compared with the ones of variable fuzzy set theory, set-pair theory to verify the reasonableness and effectiveness of the method.
Estimation of Direction of Wavefront Propagation and Apparent Velocity Using Earthquake Signals Recorded in Small-Size Dense Seismic Arrays
Authors: Liu Ping , Ma Hua , Zhang Xue Wei , Sun Xin Yu , Cao Fei , Yu Lei Lei
Published: June 2012

This paper presents that the cross-correlation method is used for estimating the direction of wavefront propagation and the apparent velocity for seismic signals in the small-size dense seismic array. The near earthquake signals samples adopted from US Geological Survey Parkfield Dense Seismograph Array (UPSAR array) of the U.S are used for analyzing. The results analyzed indicate that the wavefront propagation and the apparent velocity of near earthquake signals can be succinctly and accurately estimated by the method proposed in this paper.
Research on Seismic Behaviour Factor of CBSF
Authors: Li Cheng , Yang Jun Fen , Gu Qiang
Published: June 2012

In this paper,the definition and computation method of seismic behaviour factor is firstly explained,and then a V concentrically braced steel frame (CBSF) and an inverted-V CBSF were designed according to Chinese design codes,after that, the incremental dynamic analysis (IDA) was used to get the seismic behaviour factor.The results indicated that whether the connections between braces and columns or beams are rigid or hinged,which does not have much influence on the seismic behaviour factor of the structures.But the different seismic wave may bring different seismic behaviour factor for the same stuctures.Furthermore,the analysis method,limit state,failure criterion and finite element model of structures have some influrnce on the seismic behaviour factor of structures,and much work was needed in this research field.
Study on Change of Seismic Safety of RC Frame Building in Wenchuan County Town
Authors: Wu Di , Xiong Yan
Published: June 2012

Comparison of the vulnerabilities between former and current RC frame structures after the 2008 Wenchuan earthquake are performed in the paper. Two representative types of RC frame building in Wenchuan county town are studied by nonlinear finite element method (FEM). Probabilistic seismic demand models (PSDM) for RC frame structures is built to assess the safety levels of two representative RC frames in Wenchuan county town. The fragility curves for immediate occupancy (IO), significant damage (SD), and collapse prevention (CP) damage levels of the RC frame building are analyzed. The result indicates the safety levels of current RC frame building in Wenchuan district are well improved compared to the former RC frame building after the 2008 Wenchuan earthquake.
Comparison of Base Shear Force Method in the Seismic Design Codes of China, America and Europe
Authors: Jiang Zhi Nan , Zhao Zhong Hai
Published: June 2012

Seismic design response spectrum and earthquake action in Chinese new seismic code (GB50011-2010), ASCE/SEI7-05 and Eurcode8 were gathered in this paper. Using base shear force method of each code, the authors computed the horizontal seismic forces of a three-story reinforced concrete frame building under the same conditions. The results show that the three static methods roughly approach, while the different parameters lead to discrepancies in calculated values.
The Parameter Study of Instantaneous Spectrum of Spatially Varying Ground Motion
Authors: Chen Hui Guo , Li Ying Min , Zhang Wei , Wu Zhe Qian
Published: June 2012

In this paper ,the parameter study of the instantaneous spectrum model is transformed to that of strength envelope model and instantaneous frequency model, based on the real ground motion array data, the statistical analysis result of the parameter of multipoint ground motion at local sites indicate that the most parameters are associated with projection distance and soil layer thickness, and the regression model and the value selection of various parameters provided in this paper can also be used for the reference of artificial synthesis of multipoint ground motion.
An Ensemble of Ground Motions Simulation Based on Discrete Stationary Wavelet Transform
Authors: Bai Quan , Fu Liang Hua , Bao Wen Bo , Jin Sheng Ji , Zhang Da Sheng
Published: June 2012

Simulation of earthquake ground motion was a hot topic for structure seismic response analysis. According to the problems in simulating ground motion history with harmony superposition method, such as more interference of human factors and simulated ground motion history didn’t have frequency non-stationary characteristic, a novel method of ground motion simulation based on stationary discrete wavelet transform was presented. Using stationary discrete wavelet transform, the parent ground motion history was decomposed into different frequency bands, and the coefficients were modified. Using inverse stationary discrete wavelet transform, an ensemble of ground motions were simulated whose statistics closely resemble those of the parent history. Through a numerical example, the statistic characteristics of simulated histories were compared with the original values, and the feasibility and correctness of presented method was illustrated.
Seismic Design of High Rise Building in Shenyang
Authors: Qin Rong
Published: June 2012

This paper examines the A1 tower of the Shenyang Huafu Xintiandi Phase III project as an example of an out of code structure. It also analyzes the seismic performance under three earthquake scenarios; a frequent earthquake, a moderate earthquake and a rare earthquake. This paper will discuss the structural elements design, and address the weak points. This paper also provides several seismic design enhancements for similar high-rise buildings.
Studies on Seismic Performance Test of Precast Prestressing Shear Wall
Authors: Fu Ri Rong , Liu Zhi Chun , Yin Qi Lin , Su Kun
Published: June 2012

This paper describes the study about multilayer and high-rise precast prestressing shearwall structure ,we made one shape,T shape and linked limb shearwall specimens as the objects,we also made comprision with cast-in-place shearwall,the specimens were tested under high frequency and reciprocating horizontal load.Based on the test,we used the finite element software ANSYS to do a nonlinear elasto-plastic analysis about the whole process under different compression ratios and different effective prestress to research seismic performance, failure mode and elasto-plastic analysis.The results show that the edge members are the maximum force position and the most important energy dissipation part of the shearwall limb.
Seismic Response Analysis of Large Liquid Storage Tanks
Authors: Zhang Yuan , Guan You Hai
Published: June 2012

Due to frequent earthquakes in recent years, the seismic safety of large storage tank is very important. In this paper, seismic response of large liquid storage tanks is analyzed. A model for liquid storage tank is established firstly. By modality analysis, dynamic behavior of large storage tank is obtained. After the model is excitated by seismic, seismic responses are obtained. The conclusions show that, without considering liquid-solid coupling, "elephant foot" buckling phenomenon doesn’t appear. This study provides reference for seismic design and seismic performance study of large storage tank.
Analyzing Seismic Destructive Effect to the Submarine Rock and Soil Layers According to Submarine Seismic Records
Authors: Zhang Bang Hua , Tian Hong Shui
Published: June 2012

By means of survey and study, various submarine seismic records were identified in the marine facies strata from Sinian Period to Ordovician Period in Tancheng-Lujiang seismic fault zone and its vicinity. These submarine seismic records are divided into two classes. According to the mode of seismic action, every class of submarine seismic records is divided into three to four types. On the basis of classification, this paper studied and summarized seismic destructive effects to the submarine rock and soil layers and diagrammatized mechanism and process of seismic destructive effects. Seismic destructive effects to soft sedimentary soil strata mainly include seismic vibratory liquefaction, vibratory thixotropic effect, seismic fold deformation, sliding deformation, tensile deformation and combined action of shaking and weight. Seismic destructive effects to submarine soil strata of semi-consolidated to un-completely consolidated sediments mainly include syn-sedimentary fault effect, crack and smashing effect, filling effect of seismic crack, etc.
Research on Numerical Simulation of Smart Base Isolation System with MR Damper(II)
Authors: Fu Wei Qing , Chen Fei , Wang Hong Mei
Published: June 2012

Rubber bearing base-isolation is well-developed vibration reduction technique, and is applied in practical engineering broadly. But displacement of vibration isolating layer is large, so lead plug rubber bearing is used. It is passive control device; therefore its optimal central extent is narrow. That is isolating layer is optical in several defined kind and magnitude of earthquake waves, in the way controlled displacement and acceleration of superstructure is ideal. Magnetorheological damper has good smart performances- broad controlled band, fast response and demand a little energy. In this paper smart base isolation system, which is combined with rubber bearing and MR damper, is applied to structural vibration control, and have numerical simulation of structure employing LRB isolation and smart isolation in different kind and magnitude of earthquake waves. The result indicates smart base-isolation with MR damper can supply optimal control to these different earthquake waves, so is a good supplement and perfection for former isolation technique.
Lamb Wave Scattering Induced by a Rectangular Hole
Authors: Feng Fei Long , Lu Chao
Published: June 2012

Lamb wave scattering at a rectangular hole are investigated by using modal decomposition method. Take advantage of the biorthogonality relation, the scattering matrix is derived in an explicit form. The efficacy of the method is illustrated by numerical examples. The results are compared with those gotten from numerical models and the calculation accuracy is analyzed.
Research on Safety Assessment Theories and Application of the Internal Force Envelope Method in the Health Monitoring of Large
Authors: Zhou Jian Ting , Song Jun , Yi Zi Lin
Published: June 2012

This paper puts the internal force envelope method in bridge design into the safety assessment of bridges’ health monitoring, and proposes a safety assessment technology based on the method, which is stated in three aspects: the safety assessment modal, the acquirement of the real-time Figure of bridges’ internal force resistance and of the real-time Figure of bridges’ internal force. After the application in the Nu Jiang Bridge, it is proved that the safety assessment technology based on the internal force envelope method is simple, easy to understand, reliable, visualized and prospective in further application.
Experimental Investigation on Dynamic Response of Spherical Explosion Vessel in Sludge
Authors: Chen Da Yong , Jun Yang
Published: June 2012

Treatment and disposal of sludge has been identified as a large problem in environmental science. Using explosion shockwave can destroy sludge (moisure content greater than 95%) colliod structure and improve sludge dewaterability and anaerobic digestion, it plays important role in dealing with this problem. Overpressure in sludge and wall strain of spherical explosive vessel were investigated, usefull overpressure and strain law were obtained. The research results provide effective information for sludge treatment and safty assessment of explosion vessel, and to design large-scale experiments by similarity theory.
Blast Experiment Research on Safe Extent of Framed Glass Subjected to Small Priming Charge Explosion
Authors: Ting Pan , Liu Tong , Jiang Qi , Gao Feng
Published: June 2012

With the spread of terrorism all over the world, many buildings become targets of attacks. Glass will break easily under explosion load, therefore improve the anti-explosion performance of architectural glass can effectively reduce the damage caused by bomb attacks. Nowadays domestic study mainly focus on material performance, seismic resistance, construction design of architectural glass, but the study of glass’s anti-explosion performance is still in the preliminary stage, and there is also no anti-explosion design standard for architectural glass. Research of blast experiment for framed glass was made combining with shock wave, explosion load destruction effect, dynamic property of glass. float glass was used for the experiment, and finally the method to ensure safe extent of framed glass under a small priming charge explosion was put forward.
Fiber Optic Inclinometer for Landslide Monitoring
Authors: Li Feng , Zhang Wen Tao , Li Fang , Du Yan Liang
Published: June 2012

As a main parameter reflecting the security status of slope, internal displacement monitoring has been an important issue to geotechnical engineering. An optical inclinometer is demonstrated, which utilizes FBG sensors attached to the casing of a conventional inclinometer. Three arrays of sensors at an interval of 90 degrees are glued to the outside of inclinometer. The authors carried out model experiment, in which characterization of the sensor revealed good agreement with theory and conventional displacement measurements. Meanwhile, angle monitoring result was rewarding, monitoring value of 44.3 and 29.5 degrees corresponding to the actual value of 45 and 30 degrees respectively.
Simulation Research on the Member Removal Method of the Typical Construction in Collapse Accident
Authors: Chen Xin
Published: June 2012

Component removal method is usually taken to open up relief channel. It is necessary to make a research on the feasibility of removing and make an analysis on some problems. This paper summarized the typical collapsed buildings and the typical rescue technique used in Wenchuan earthquake. The numerical model of typical buildings collapsed was gotten . Based on the characteristics of the application of removing technique, a numerical analysis was made. The results show that the angle between the component and ground should not be changed. The direction in which the components are lifted should be in a moderate direction with other lap components .Try best to make its contact area produce some friction force.
Landslide Hazard Divisions of Shaanxi Province
Authors: Ji Hai Jun , Ji Yun
Published: June 2012

With the factor superposition method, we conduct a risk of landslide hazard zoning of Shaanxi province based on the detailed investigation of landslide disaster risk of there. Learn from the experience of past geological hazard zonation, we determine the geological hazard assessment criterion. At the same time, we establish the geological disaster evaluation index system through the analysis of the forming conditions and the influencing factors of landslide disaster. Then, we determine the weight of each index by using gold segmentation method. At last, we make the landslide of Shaanxi province in a four levels of risk division by using the comprehensive analysis of the factors superposition method.
Analysis of Fire Resistance Response of Double Shell Structure under Specific Fire Scenarios
Authors: Chen Xin
Published: June 2012

The double-shell structure under high temperature will lead to structural changes in material properties. Thermal expansion causes the production of thermal stress of the additional constraints bar, whose security research is the aim of this paper. The paper chooses Laoshan Velodrome Olympic venues as the research object, dividing the temperature zones of shell structure, and conducting the FDS simulation temperature field. The internal temperature of structural elements of computational shell in various zones will be in accordance with the first constant load and dead load after warming loading method to give a finite element analysis and give an evaluation of the safety of shell structure. The results show that: the temperature of the fire scenarioⅠis significantly higher than that of the fire scenario Ⅱ.We selecte the temperature of the fire scenario Ⅱ as the temperature load, and find that the local damage of six bars in the high-temperature zone occurs, which won’t cause structural damage to the whole structure. Therefore, these 6 bars need to be sprayed with fire retardant coating.
The Discussion on Fire Load Maximum of Building
Authors: Wang Jin Ping
Published: June 2012

Fire load exists in the building, and it is generally not the origin of fire occurred and spread, so attention has not been beloved paid although the fire size is closely related with it. It plays an important role in performance-based fireproof design, but the abroad data is used always, then which is not in accordance to the situation of our country. The article is based on national and international standards, and calculated the fire load theoretical maximum of the building to protect the building fire safety and can be referred by performance-based fireproof designer, so we can control the fire dangerous of the building, and then grasp the critical moment while the fire happened.
Constitutive Model of Shallow Landslides Catastrophe Theory under the Heavy Rainfall
Authors: Cheng Sheng Guo , Zheng Hong
Published: June 2012

Heavy rainfall has important implications to shallow landslide stability. In the paper, the relationship between the soil moisture content and soil shear strength and between surface displacements of landslide and rainfall were studied. Their statistical relationships were established. Relationship between soil moisture content and shear strength should be fitted using the logarithmic function. Relationship between soil slope and rainfall displacement should adopt the power function fit. Constitutive model of catastrophe theory of heavy rainfall landslides stability was known, which it is very important to provide a theoretical basis for prediction.
Analysis of Collapse Behavior for Demolition of Brick Walls
Authors: Liao Chia Wen , Chiang Tsung Lung
Published: June 2012

Brick wall collapses contributing to occupational fatalities constantly happen to construction-related workers. The number of workers involved in brick wall collapse accidents is more than that in other accident types. The brick wall collapse accidents accounted for 93% of the structure collapse cases, and about 64% of brick wall collapse cases are in connection with demolition of brick walls. In order to find out the major risks of demolition of brick walls, this article examines occupational accident statistics and case reports from the Northern Region Inspection Office of the Council of Labor Affairs of Taiwan. Discontinuous Deformation Analysis (DDA) is employed to discuss the collapse behavior for demolition of brick walls. A procedure during the demolition of brick walls is suggested for the purpose of safety.
The Influence of Static Response of Super Tall Building Mega-Frame Structure Caused by Changes of Frame Rigidities
Authors: Xie Xiang Dong , Wang Xuan , Qin Li
Published: June 2012

The superstructure and its foundation of a super tall building mega-frame structure are simplified equivalently and continuously to a stiffened-thin-wall tube on semi-infinite elastic subgrade. And the influences of static response on super tall building mega-frame structure caused by changes of frame rigidity are computed and analyzed with the three-dimensional model by semi-analytical approach based on ODE(Ordinary Differential Equation) Solver, considering the interactions of subgrade, foundation and superstructure. Then some valuable conclusions are obtained through analyzing the reasonable results of the numerical example.
Risk Assessment of Field-Scale Flood Disaster Based on Combined Remote Sensing and Hydrological Dynamics Model
Authors: Zhang Jing , Ma Guo Bin
Published: June 2012

There is an increasing need for more accurate information on the hazard and risk of flooding in local region. Besides the national-scale and regional-scale flood risk assessments, it is gradually developed with a focus on particular field-scale conditions in order to ensure that local conditions are taken into account in. On this basis, how to efficiently and effectively make use of the remote sensing monitoring products embedded with hydrological dynamics model is the critical issue for the field-scale flood disaster risk assessment. In this research, based on the established GIS database, it proposed a new combined assessment model, which integrating remote sensing products and SCS hydrological dynamics model to generate the weighted water level of inundated area for assessing the field-scale flood disaster in Hubei province. The major research methods and key technologies involved were discussed briefly. The example result reveals that combined remote sensing and hydrological dynamics field-scale risk assessment model conforms basically to the actual disaster data.
Review of Landslide Monitoring
Authors: Song Zhi Fei , Xin Xiao Ping
Published: June 2012

Abstract: This article summaries the importance of the technology of landslide monitoring, also describes main methods of landslide monitoring and new means of analysis of landslide deformation, at the same time, it briefly describes the classification of detection technology of landslide deformation and points out the prospect of engineering application of landslide monitoring technology.
Effect of Temperature on the Thermal Stress in the Single Lap Joint
Authors: You Min , Chen Cun Jun , Yu Hai Zhou , Mei Chun Zhi , Li Mei
Published: June 2012

The effect of the thermal shock temperature on the thermal stress distributed in the adhesively bonded steel single lap steel joint under a 10 s thermal shock was investigated using elasto-plastic finite element method (FEM). The results showed that both the highest temperature at the surface and the lowest one at the mid-bondline increases as the temperature of the thermal shock raised (80 C to 140 C) and all the peak values of the stresses at the mid-bondline and the zone of negative Sx in adherend increased as the temperature of the thermal shock elevated.
Failure-Mode Based Coupled Shear Wall Optimization Design
Authors: Zheng Shan Suo , Xu Qiang , Li Zhi Qiang
Published: June 2012

Failure-mode based optimization is very effective at improving the performance of structure, therefore, a new optimal approach based on failure mode with the ability to limit the cost is proposed. Three different failure modes of the coupled wall are discussed, and then the objective function is setted up according to the expected failure mode and minimum cost. Finally, an example is cited to verify the method. It is concluded that the method can supply an effective way to reduce the cost of coupled shear wall, and the expected failure mode can be obtained.
The Effects of Applied Axial Stress on Lateral Bearing-Load Capacity for Fully Grouted Reinforced Concrete Masonry Shear Walls
Authors: Zhao Y. , Wang Feng Lai , Zhu Fei
Published: June 2012

Ten full-scale fully grouted reinforced concrete masonry shear walls were tested under force-displacement controlled reversed cyclic lateral loads simulating seismic effects. Relevant experimental phenomena and data indicated four walls failing in shear failure and the other six walls failing in flexure to evaluate seismic performance under compress, flexure and shear combined action. The paper mainly examinates lateral bearing-load capacity through two parameters: initial crack and ultimate strength under different failure modes. Through experimental analysis it can be concluded that the shear strength at the initial crack and ultimate load improved with the increased applied axial stress, and the increment of the shear strength was different in shear failure and flexural failure modes. Meanwhile, the ratio of the initial crack load to ultimate load on shear mechanism was from 0.57 to0.59,which was more stable than that(from 0.52 to 0.66)on flexural mechanism. In other words, the applied axial stress have more significant influence on flexural failure walls than shear ones.
Strain Analysis of Four-Tube Concrete-Filled Steel Tubular Columns
Authors: Chen Bo Wang , He Ran , Cao Yan
Published: June 2012

By means of axial compressive and eccentric compressive tests of four Four-tube Concrete-filled Steel Tubular Laced Columns, to research the strain modes of these columns without yield point. Longitudinal strain and the hoop strain of column limbs, the Poisson ratio of combination of materials have been obtained.
Analysis of the Mechanical Behavior of Short Tube Columns Filled with Concrete by Different Contact Surface Conditions
Authors: Fan Te Wei
Published: June 2012

Concrete-filled steel tubular(CFT) columns are often used as the main supporting columns for high-rise buildings and has become a topic of academic concern. The past research about CFT most focused on its ultimate strength and mechanical behavior. The experiment method which is usually expensive and time-consuming. Other research methods include combining experimental data with appropriate theory to design or calculate the structural properties, and these methods tend to have a conservative assessment of the results. Therefore, some researches have been developing finite element model to simulate and analyze the ultimate strength and buckling condition of CFT and its component behavior. In this paper, finite element analysis is used to explore the mechanical behavior of CFT during exerting axial compression load. Contact pair settings and friction coefficient settings were compared with different pattern to investigate the accuracy of simulation and the mechanical behavior of CFT columns. Study found that the ultimate strength for CFT columns obtained by finite element analysis can achieve good accuracy, and in the mean time the mechanical behavior simulation of CFT columns with proper finite element settings could be achieved.
Mechanical Properties of Wood-Polymer Composite Prepared by In-Situ Polymerization of Methyl Methacryalte and Styrene
Authors: Li Yong Feng , Gong Ding Wang , Dong Xiao Ying , Liu Zhen Bo
Published: June 2012

Fast-growing poplar wood, Populus ussuriensis Kom, was used to prepare novel wood-polymer composite by the in-situ polymerization of methyl methacrylate (MMA) and styrene (St). SEM observation and FTIR analysis indicated that the resulted polymer well filled up wood cell lumen and physically reinforce wood matrix. The test results also proved that the mechanical properties of wood including modulus of rupture, modulus of elasticity, compression strength and hardness of were improved by 68.28%, 110.27%, 62.43%, 357% over those of Untreated Wood, respectively. Such wood-based composite could be potentially used as reinforced material in construction fields.
Mechanical Properties of New Cold-Formed Flange-Closed Welding Section Members
Authors: Wu Sheng
Published: June 2012

The hollow flange beam (HFB) is a unique cold-formed steel section developed in Australia for use as a flexural member. This paper presents two kinds of new cold-formed flange-closed welding sections named HF1 and HF2 according to different section component and parameters of HFB. Nonlinear finite element method has been adopted to investigate the mechanical properties such as buckling mode, deformation process, rigidity, ductility and correlation curve of two kinds of new section members which being subjected to axial compression, flexure, combined compression and bending. Some conclusions can be drawn from above work that the new sections have some superiority properties, such as higher load carrying capacity and section modulus, sufficient section stiffener and the sub element local buckling hard to happen and so on. Being subjected to flexure and also being subjected to compression, combined compression and bending are suitable for the mechanical properties. The new cold-formed flange-closed welding section members can be applied to the experiment investigation deeply so as to be used in the practical engineering.
Rock Mechanics Parameters Calculation of the Fractured Rock Based on the Effective Media Theory with Well Logging
Authors: Zhang Yuan Zhong
Published: June 2012

Fractured rocks are the main oil and gas exploration objects offshore in China in recent years, which include the fractured sandstone, carbonate, volcanic rock, coal methane bed, shale gas and so on. The accurate calculation of the rock mechanics parameters (elastic modulus and Poisson’s ratio) play remarkable role in petroleum engineering operations, such as borehole stability, mud density window determination, perforation, EOR, in-situ stress predication and so on. Now the applications show that the in-situ stress estimation based on the rock parameters obtained by acoustic logging is much different from the downhole measurement with wireline formation tester. The pore space of the fractured rock contains fracture and cave and it is different from sandstone. In the paper a novel method based on the effective media theory with well logging for the rock mechanics parameters calculation of the fractured rock is introduced, and some problems and potential application are also discussed.
Test Research on the Behaviors of Steel Bar Truss and Concrete Superimposed Floor Slabs
Authors: Li Yong Xing , Jiang Lu , Yu Zhi Qiang , Li Jie , Li Yong Wei
Published: June 2012

Tests on two simple supported steel bar truss and concrete superimposed floor slabs have been carried out to study their mechanic behavior and bearing capacities. The one is prefabricated steel truss concrete slab without temporary support in the mid-span to simulate its mechanic status in construction stage, the other is superimposed board (prefabricated + post-cast layer) in use phase. Test results show that the deformation of the prefabricated steel truss concrete slab in construction stage meets the requirement of the Code, and the slab is mainly controlled by deflection instead of cracks; Performance of superimposed board is excellent in use stage; and the steel bar is elastic in both stages during the tests.
CFD Simulation of Prediction of Pressure Drop in Venturi Scrubber
Authors: Ali Majid , Yan Chang Qi , Sun Zhong Ning , Wang Jian Jun , Mehboob Khurram
Published: June 2012

Venturi Scrubbers are used in filtered vented containment system (FVCS) for collection of aerosols produced in NPP in severe accidents. Therefore, venturi scrubber (VS) needs an attention to design it properly and improved in all aspects. In this research, CFD simulations of prediction of pressure drop in venturi scrubber has been carried out. ANSYS CFX tool is used to obtain the simulation results. k-ε turbulence model is employed to study the fluid dynamics of the venturi scrubber. Mesh size plays an important role for convergence and accuracy of results. Therefore, the mesh independency is checked for optimized mesh size.
On a Refinement of Hardy-Hilbert Inequality
Authors: Sun Bao Ju
Published: June 2012

In this paper, by using Maximum-minimum monotonic theorem and estimating the weight coefficient, a refinement of Hardy- Hilbert inequality is established.
Analytic Solution of Single Span Beam under Non Uniform Load
Authors: Feng Qing Xing , Qu Chen
Published: June 2012

During the process of structure design, non uniform load on beam usually is considered as similar uniform load. Some analytic solution formulas of bending moment about beams acted on symmetric load are deduced. Table of equivalent uniform load coefficient according to the principle of bending moment equivalency is listed. The feasibility and beware are also discussed.
Experimental Study of Droplet Size Distribution Produced by a Multi-Orifice Effervescent Atomizer
Authors: Xu Fang , Dong Wei , Qiang Liang
Published: June 2012

A new multi-orifice effervescent atomizer used for fire fighting was developed. The droplet size distribution of the spray produced by the nozzle was measured by laser Doppler particle analyzer. And the influence of liquid injection pressure, water flow rate and atomizer internal geometry was studied.
Calculation of Different Stages Reinforced Concrete Beam Bending Stiffness
Authors: Guo Xiao Yan
Published: June 2012

By means of inertia-moment method, formulae are derived for calculating flexural rigidity of RC beams under different loading stage, which can be used for calculating initial rigidity and rigidity in service stage. Involving less parameters, it’s convenient to use the formulae. As for four examples, calculations are carried out by both code method and formulations given in this paper, and satisfied results are shown. Further more, based on finite rib method, nonlinear-all-rang analysis is done for M-B of beam sections.
Numerical Study of Joint Behaviour for Robustness Assessment
Authors: Gizejowski Marian A. , Kwasniewski Leslaw , Saleh Bashir , Balcerzak Marcin
Published: June 2012

The paper presents studies on numerical modelling of beam-to-column joint behaviour in typical service and exceptional design situations. The complexity of such investigations arises from highly nonlinear effects associated with the prediction of joint performance, such as structural imperfections, large displacements and rotations, inelastic properties of steel and concrete, bonding effects between steel and concrete, and slip between concrete and structural steel, among others. The paper addresses these problems and provides validation of numerical modelling techniques trough comparison with experimental data for joints under hogging and sagging moments.
Implementation Procedures of Parallel Preconditioning with Sparse Matrix Based on FEM
Authors: Ji Guo Liang , Feng Yang De , Cui Wen Kai , Lu Liang Gang
Published: June 2012

A technique to assemble global stiffness matrix stored in sparse storage format and two parallel solvers for sparse linear systems based on FEM are presented. The assembly method uses a data structure named associated node at intermediate stages to finally arrive at the Compressed Sparse Row (CSR) format. The associated nodes record the information about the connection of nodes in the mesh. The technique can reduce large memory because it only stores the nonzero elements of the global stiffness matrix. This method is simple and effective. The solvers are Restarted GMRES iterative solvers with Jacobi and sparse appropriate inverse (SPAI) preconditioning, respectively. Some numerical experiments show that the both preconditioners can improve the convergence of the iterative method, and SPAI is more powerful than Jacobi in the sence of reducing the number of iterations and parallel efficiency. Both of the two solvers can be used to solve large sparse linear system.
Travelling Wave Solutions of Nonlinear Evolution Equation by Using an Auxiliary Elliptic Equation Method
Authors: Xiang Chun Huan
Published: June 2012

The Camassa-Holm and Degasperis-Procesi equation describing unidirectional nonlinear dispersive waves in shallow water is reconsidered by using an auxiliary elliptic equation method. Detailed analysis of evolution solutions of the equation is presented. Some entirely new periodic-soliton solutions, include Jacobi elliptic function solutions, hyperbolic solutions and trigonal solutions, are obtained. The employed auxiliary elliptic equation method is powerful and can be also applied to solve other nonlinear differential equations. This method adds a new route to explore evolution solutions of nonlinear differential equation.