bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Records of the Wenchuan MW 8.0 Strong Earthquake in 2008
Authors: Guo En , Zhou Xi Yuan , Zhao Zuo Zhou , Sun Hang
Published: February 2012

There are a large number of acceleration records obtained in the near fault strong motion of Wenchuan earthquake in 2008, which greatly enriched the database of strong motion. By the classification analysis to Sichuan records and comparison with the domestic and international earthquakes analysis, we draw the following conclusions: 1) whether parallel or perpendicular direction, the peaks of soil are greater than rock. With the fault distance increasing, the gap between the two gradually will minish.2) With the increase in the number of peaks obtained, the correlation coefficient of GPGA or LGPA is generally increasing.3) The mean of R is respectively 8.10(rock), 10.31(soil), 10.10(total) in the usual range.4). The average of λ is respectively 0.5862(rock), 0.5707(soil), 0.5722(total), they are between 1/2 and 2/3. The difference is not large.
Study on the Simulation of Spatial Variable Seismic Ground Motion Considering Local Site Convergence
Authors: You Zhi Ming , Cao Zhi Xiang
Published: February 2012

By modifying the Random phase angle ,conventional method of ground motion simulation is improved .The simulated result that used conventional method have a good astringency on the limited site and more reasonable to accord with actual state of seismic. To make the simulated result with variability in space and time, simulated progress considered not only the traveling wave effect, but also the spatial coherence of the seismic ground motion and local site effect.
Research on Applications of Wavelet Transform Threshold Method to Strong Motion Signal Processing
Authors: Li Wei , Li Shan You , Zhao Zhen , Sun Zhi Xin
Published: February 2012

Fourier transform and short-time Fourier transform are the main methods in signal analysis, which can reflect the spectrum signature of signals in the whole time domain; but they cannot be used in the multi-resolution analysis on the non-stationary signals. However, the wavelet transform overcome the limits of Fourier and short-time Fourier transform, which can be performed in accurate time-frequency analysis of signals. Furthermore, the diversity of wavelet functions makes the wavelet transform more adaptive and flexible. Applying the wavelet transform to seismic signal processing is the complement and improvement of existing processing methods. In this paper, the basic theory of the wavelet threshold denoising method and its application to the strong motion signal processing were mainly introduced. The high-frequency noises were removed, and simultaneously the high-frequency signals were effectively retained.
Shaking Table Test of a Long-Span Continuous Girder Bridge
Authors: Chen Yan Jiang , Zhou Da Xing , Yan Wei Ming , Tang Zhen Yun
Published: February 2012

Compared with middle-span bridges, seismic response of long-span bridges is more complicated, and so is seismic design. For example, influence of high order modes is obvious, as well as multi-support excitation, all kinds of nonlinear factors and soil and structure interaction (SSI). It is necessary to study on seismic behavior of a long-span continuous girder bridge. With the help of shake table array and substructure test technology, study on seismic performance of a long-span continuous girder bridge has been done and some useful conclusions have been got.
Evaluation on Driver’s Mental Tenseness under the Condition of Snow Pavement
Authors: Wu Shi Mei , Cheng Guo Zhu , Pei Yu Long
Published: February 2012

In order to study driver’s mental workload when driving on snow pavement, data of snow pavement’s friction coefficient were observed and blood flow, skin temperature and respiration volume of driver’s were obtained through field experiment. Friction coefficient of snow pavement ranges from 0.04 to 0.31. The correlation between temperature of atmosphere and friction coefficient, snow’s thickness and friction coefficient are weak. And the correlation between moisture of atmosphere and friction coefficient, snow’s degree of compaction and friction coefficient are strong. Multi-linear regression model was established among moisture of atmosphere, snow’s degree of compaction and friction coefficient. The average value of inexperienced driver’s blood flow, skin temperature and respiration volume are 171.423mv, 33.263°C and 2317.263ml when driving on snow pavement, which are far greater than that of experienced driver’s and that of inexperienced driver’s when being immobile and driving on non-snow pavement. The effects of snow pavement on mental workload of inexperienced driver’s are obvious. According to driver’s physiological index, calculation model of diver’s tenseness degree was established and it can evaluate tenseness of drivers quantitatively.
Research on the Purification Ability of Porous Asphalt Pavement to Runoff Pollution
Authors: Zhao Yao , Zhao Chen
Published: February 2012

PAP has widely used in Europe, the U.S, and Japan. As an effective technology for urban stormwater management, PAP not only decreases stormwater volumes but also improves runoff water quality including heavy metals, suspended solids (SS) and nutrients. In addition, it help protects groundwater and urban environment. In this paper the current trends of investigating the purification ability of PAP are introduced. The characteristics, the pavement structures and materials are analyzed. The recent researches in field studies and laboratory experiments are highlighted. The present applications of and challenges to PAP are discussed. Further research needs are recommended.
The Application Research and Discussion on a Viaduct Artificial Excavated Pile Technology
Authors: Li Dong Guo , Shi Gui Mei
Published: February 2012

A viaduct of the Qinglai expressway fourth contract was artificial excavated piles. The construction technical work was regarded as an example. The technical comparison were done between the artificial excavated pile and the bored pile on the pile foundation bearing capacity and the retaining wall effect . The artificial excavated pile replacing the bored pile was feasible, and the construction technology and the key problems of the artificial excavated piles were confirmed. The references were provided to the similar projects.
Test for TG Soil Stabilizer Used in Pavement Base
Authors: Hou Zi Yi , Guo Xiao Qiong
Published: February 2012

TG soil stabilizer was used for sand. A lot of experiment was made. The influence of cement, flyash and stabilizer content to unconfined compression strength were analyzed using orthogonal experiment. It was shown that the ranking of factors influencing 7d and 28d strength of stabilized soil is cement content>stabilizer content>flyash content. TG stabilizer is mechanical property well and simple to construction. It can meet with the demand of pavement base as a new cohesive material in stone lack area. There is good foreground for stabilizer used in highway.
Analysis of Thermal Stress for Asphalt Surface on Porous Concrete Base
Authors: Suo Li Jun , Tong Huai Feng
Published: February 2012

In the paper, three–dimension finite element model of asphalt pavement, which includes transverse contraction joint of porous concrete base and asphalt surface, is established for the purpose of studying thermal stress of asphalt surface which is located in transverse contraction joint of porous concrete base. Calculation results of thermal stress are compared with each other. The results show that thermal stress of asphalt surface increases with increase of surface’s modulus, and thermal stress of asphalt surface increases with increase of ratio of base’s modulus to foundation’s modulus, and thermal stress of asphalt surface increases with increase of temperature field of base.
Research on Cooperative Working Performance of Cold-Formed Steel Stud Wall - Steel Frame Structure
Authors: Wu Han Heng , Zhou Tian Hua , Shi Yu
Published: February 2012

Research on cooperative working performance of cold-formed steel stud wall(CFSW) and steel frame(SF) was carried out by analytical method and finite element method. The practical calculation methods of shear force and horizontal displacement for CFSW - SF structure under horizontal load were presented. The superposition principle between CFSW and SF in elastic stage was verified in terms of strength and stiffness. The investigation by FEM indicates that the shear force distribution in elastic stage is in accord with lateral stiffness of CFSW and SF, the shear force distribution rate of CFSW declines along with the increasing of horizontal displacement while thar of SF increases because lateral stiffness of SF degenerates more slowly than that of CFSW.
Evaluation on Damaged Pavement and Its Influence on Capacity of Urban Road Section
Authors: Wu Li Xin , Cheng Guo Zhu
Published: February 2012

To evaluate the capacity of urban road section with damaged pavement accurately, it is necessary to evaluate on damaged pavement and study the quantified affects of damaged pavement on the capacity of road. In this paper, pot hole’s width, rut depth, crack ratio and repair ratio were used as the evaluation indicators of the of pavement’s status, the evaluation method of damaged pavement through gray cluster analysis was given. The surveyed damaged pavement sections are classified through this method. The definition of damaged pavement correction coefficient is given, using gradual approach method to decrease damaged pavement correction coefficient till the error of capacity of road section is lower than admissible error, the damaged pavement correction coefficients of different levels of damaged pavement were obtained based on the parameter that surveyed on different level of damaged pavement sections.
The Composite Asphalt Pavement Structure Serrice Life Analysis which Setting the Graded Gravel between the Asphalt Surface Layer and the Semi-Rigid Base Layer
Authors: Shi Gui Mei , Li Dong Guo
Published: February 2012

In this article, the three-dimensional finite element method was used to analyse the composite base asphalt pavement structure life, which setting the graded gravel layer between the asphalt surface layer and the semi-rigid base layer. The main effect considering on the service life were the face layer thickness, the graded gravel thickness ,the contact state and so on, and compared the compound base with typical semi-rigid base the service life of the asphalt pavement . The analysis shown that the road surface contact state was the biggest influence to the service life. When using reasonable pavement structure combination, composite base asphalt pavement generally wouldn't produce the service life of the decline .
Analysis of Temperature-Dropping Characteristics of Warm Mix Asphalt and Hot Mix Asphalt
Authors: Hou Shu Guang
Published: February 2012

In order to research the temperature-dropping characteristics of warm mix and hot mix asphalt, some rutting test panels are used as specimens to determine the temperature-dropping characteristics of hot mix asphalt（HMA）, warm mix asphalt（WMA） with mixing additive “LuBo” and warm mix asphalt with mixing additive “Sasobit” under the conditions with initial temperatures of 110°C and 130°C. The test results indicate that：the higher initial temperature，the higher temperature-dropping rate is. After 25min the temperatures of rutting test panels with initial temperatures of 110°C and 130°C are close to 66°C and 68°C. The temperature-dropping rates of different types of mixtures are not the same. When the initial temperature is 110°C, the temperature-dropping rate of hot mix asphalt is the highest, the temperature-dropping rate of warm mix asphalt added with “Sasobit” is in the middle, and the temperature-dropping rate of warm mix asphalt added with “LuBo” is the lowest. After 35min, the temperatures of the three types of asphalt mixtures had fallen by 53°C， 51°C and 49°C separately.
Optimal Design of Small Pile Composite Foundation Based on Settlement Control
Authors: Tong Huai Feng , Suo Li Jun
Published: February 2012

On the basis of settlement analysis of small non-sand concrete pile composite foundation under the action of anaphase load, optimal design method of the post-processing technology for soft-foundation is researched on the basis of settlement control in this paper. Which provides theoretical basis for the design of small pile composite foundation.
Development of Passive Energy Dissipation Device with U-Shaped Steel Damper Based on Quasi-Linear Motion Mechanism
Authors: Gao Jin He , Tagawa Hiroshi
Published: February 2012

This paper presents a new energy dissipation device for earthquake protection of structures. The proposed device, which uses a quasi-linear motion mechanism, achieves dissipation of seismic energy into the structure through yielding of U-shaped steel dampers. Consequently bracing members are subjected to only tensile force. Cyclic loading tests of the portal moment frames with the proposed device are conducted. Results and discussions are presented with emphasis on key features which affect energy dissipation capability. The lateral load and story drift angle relationships show that the proposed device provides stable and reasonably large energy dissipation capability. The effect of pre-tension applied to the bracing members is also examined through the brace axial strain and lateral load relationship.
An Analysis of Two-Dimensional Steady Seepage Flow of Earth Dam Based on FEM
Authors: Wu Chang Chun
Published: February 2012

Through project examples, this paper set up a two-dimensional finite element seepage flow model with the help of the Auto-BANK software, to solve the soakage line overflow points, seepage quantity and seepage gradient of the earth dam based on the basic equation of steady seepage flow of earth dam and definite conditions. It is found that this method can effectively calculate and analyse multi-media seepage flow field with complex boundaries.
MUSLE Evaluation of Soil Loss on a Construction Site by Using Gauging Weirs
Authors: Hani Ismail Siti Isma , Yee Hooi Min
Published: February 2012

During urbanization, large areas of soil are exposed to the risk of soil erosion due to extensive earthworks and construction activities. Runoff from construction sites is known by far the largest source of sediment clogging our waterways. Erosion occurred from the study area due to removal of vegetation, high rainfall intensity, alteration of existing topography, and the covering of previously vegetated surfaces with impervious cover such as roads, driveways and buildings. The main objective of this study is to evaluate the soil loss due to storm rainfall and runoff on a construction site located at Sungai Ara, Penang State of Malaysia. A purpose-built hydraulic structure namely Sharp Crested Rectangular Weir was constructed and installed on site for more reliable estimates of flow during storms. The soil loss was then evaluated by using an empirical modeling known as the Modified Universal Soil Loss Equation (MUSLE). Results showed that large amount of sediment has being eroded from the study area during these activities. The highest soil loss rate was estimated was 64 ton/ha during a storm event.
Experiments on Evaporation of High-TDS Phreatic Water in an Arid Area
Authors: Li Xian Wen , Zhou Jin Long , Jin Meng Gui , Liu Yan Feng , Li Qiao
Published: February 2012

The experimental research on evaporation of high-TDS phreatic water in arid areas is rarely involved at home and abroad. In order to analyze high-TDS phreatic water evaporation laws in arid areas, phreatic evaporation experiments in different TDS (3, 30, 100 and 250g/L) were carried out, with focus on the analysis of phreatic cumulative evaporation dynamics, daytime evaporation dynamics and diurnal variation laws in different treatments. The results showed that phreatic cumulative evaporation had significant linear positive correlations to duration, also the same relationship between TDS of phreatic water and cumulative salinity in soil profile; significant delay existed in phreatic evaporation as compared to EФ20 water-surface evaporation variation; both water-surface and phreatic evaporation dynamics showed intense night variations, and the average night phreatic evaporation capacities in the treatments with different TDS accounted for a larger share of the daily evaporation capacity, which reached about 60% for all treatments except the treatment with the TDS of 3 g/L. The influence of high-TDS phreatic water evaporation process on soil texture showed a non-linear and non-single direction. Driving factors of night phreatic evaporation consisted of the delay driving of daytime atmospheric evaporation capacity and the negative pressure driving caused by night moisture condensation.
Large Deflection Analysis of 3D Steel Frame Using Finite Particle Method
Authors: Yu Ying , Luo Yao Zhi
Published: February 2012

This paper presents the large deflection analysis of 3D steel frame using the Finite Particle Method (FPM). The FPM based on the vector mechanics discretizes the analyzed domain with finite particles whose motions are described by Newton’s second law. Instead of imposing a global equilibrium of the entire continuous system, FPM enforces equilibrium on each particle. One of the features of this approach is that no iterations to follow nonlinear laws are necessary, and no global matrices are formed or solved in this method. This paper provides the fundamentals of the FPM, including the structural discretization and particle motion equation. Then internal force formulations of 3D beam element are derived using the fictitious motion method. Two typical numerical examples are given to show the capability of the FPM in the large deflection analysis of 3D steel frame.
Influence of Surface Properties of Carbon Fibers Biofilm Carriers on Immobilization of Different Microorganisms
Authors: Ma Zhao Kun , Liu Jie , Song Huai He
Published: February 2012

Results of our workgroups have shown that carbon fibers (CFs) are high quality biofilm carriers with well biocompatibility relative to other polymer carriers used in biofilm sewage treatment. In the present study, two kinds of microorganisms, namely, aerobic nitrifier and facultative aerobic denitrifying bacterium, were immobilized on the surface of different CFs, which the effects of specific area, functional groups and wettability on immobilization of these bacteria was studied. Results show that different microorganism require for different surface properties of CFs. Biomass of immobilized aerobic nitrifier increases with increasing specific areas, surface oxygenic functional groups and wettability of CFs. It can be immobilized more facultative aerobic denitrifying bacterium if there are proper specific areas, surface functional oxygenic group and wettability on the surface of CFs
Numerical Simulation on Local Ventilation in the Mine Tunnel
Authors: Dong E , Guan Long
Published: February 2012

Based on the characteristics of the mine tunnel and turbulence equation, the mathematical model of the mine tunnel of the ventilation flow is set up .Using the software simulates and analyzes the distribution of the velocity field of airflow and temperature field under different wind speeds in the mine tunnel. The result shows that the inlet airflow at the speed 4.5m/s is more stable and lower temperature to improve the working environment on the roadway.
Influence of the Temperature on GZO Film Deposited by DC Magnetron Reactive Sputtering
Authors: Yu Song , Yang H D , Huang B , Zhang J S
Published: February 2012

GZO transparent conductive thin films were deposited by the direct current magnetron sputtering method from a ZnO target doped with Ga2O3 of 3wt% on glass slide substrates under high pressure of argon. The effect of substrate temperature on the GZO film’s morphology, optical and electrical properties is investigated by using scanning electron microscopy (SEM), UV spectrophotometer, four point probe and Spectroscopic Ellipsometer. The results showed that GZO thin films with high quality could be fabricated under the high pressure of argon.When substrate temperature is 250°C or below, surface morphology of thin films can be significantly improved.With the increase of substrate temperature, the crystal grain become larger, the crystal boundaries narrow and become clear, and reach a best case at 250°C. At the same time, the resistivity of GZO thin films decrease and reach the minimum which is 1.099×10-3 Ω•cm at 300°C while the average transmittance increase to 90%. Consequently, the properties of morphology began to get worse with the increase of temperature above 300°C.
Experimental Study of Spring Wire Enhancement of Air Heat Transfer inside TIEC Tubes
Authors: Wang Yu Gang , Liu Jia Ping , Xiang Huang , Yang Shao Hui
Published: February 2012

This paper proposes the method of the fresh air heat transfer enhancement through insert Spiral in the tube of TIEC, and researches the heat transfer enhancement and Flow resistance characteristics through experiment when the Re is 6270 - 11016 range. Through regression analysis of the experimental data, obtained the experimental correlation of the heat transfer and drag coefficient of the strengthen tube, at the same time, evaluate the performance of heat transfer enhancement using appropriate method, and give some exploratory analysis.
Research on Effective Factors of Heat Transfer of Thin Heating Floor
Authors: Yan Quan Ying , Jin Li Li , Zhou Ran , Wang Sui Lin
Published: February 2012

In this paper, numerical simulations of heat transfer process in thin heating floor were done by ANSYS. The influence of tube spacing, the average temperature of hot water and indoor air temperature on surface temperature distribution of heating floor and heat density were analyzed. The results can provide reference and basis for optimization, application and promotion of the thin heating floor.
A SWOT Analysis of Wall-Hung Gas Boiler Utilized by Indemnificatory Housing in Beijing
Authors: Zhou Lei , Na Wei , Li De Ying
Published: February 2012

The construction of indemnificatory housing has been speeded up from 2009 so as to tackle the difficulty in housing for low-income families in Beijing. With an increasing emphasis on easy operation, flexible adjustment and high energy efficiency, the application of the wall-hung gas boiler are becoming more widely considered among the indemnificatory housing building as a competitive or alternative way to district and central heating. The work proposes the survey of the heating way about indemnificatory housing buildings including low-rent housing, indemnificatory housing and policy-regulated rental housing. The SWOT audit is employed to analyze the satisfaction index of the wall-hung gas boiler and other heating ways. The final analysis is then evaluated by a panel of experts to determine its accuracy and potential for use in a greenway development plan of heating way in Beijing.
Numerical Simulation on Fracture Formation on Surfaces of Bi-Layered Columnar Materials
Authors: Ma Tian Hui , Tang Chun An , Li Lian Chong , Liang Zheng Zhao , Zhang Yong Bin
Published: February 2012

Parallel fracture formation on surfaces of bi-layered columnar materials like growing tree trunk has been previously studied numerically. In this paper, numerical results of a continuous transition from parallel to polygonal fracture patterns with principal stress ratio provides the clear convincing theoretical explanation for fracture spacing. We perform three-dimensional simulations of fracture growth in a bi-layered columnar model with an embedded heterogeneous layer under inner radial expansion and terminal tension by finite element approach. As a result of this expansion, the bark stretches until it reaches its limit of deformation and cracks. A novel numerical code, 3D Realistic Failure Process Analysis code (abbreviated as RFPA3D) is used to obtain numerical solutions. In this numerical code, the heterogeneity of materials is taken into account by assigning different properties to the individual elements according to statistical distribution function. Elastic-brittle constitutive relation with residual strength for elements and a Mohr-Coulomb criterion with a tensile cut-off are adopted so that the elements may fail either in shear or in tension. The discontinuity feature of the initiated crack is automatically induced by using degraded stiffness approach when the tensile strain of the failed elements reaching a certain value. Numerical results of a continuous transition from parallel to polygonal fracture patterns with principal stress ratio are obtained by varying simulation parameters, the thickness of the material layer. We find that, except for further opening of existing fractures after they are well-developed (saturation), new fractures may also initiate and propagate along the interface between layers, which may serve as another mechanism to accommodate additional strain for fracture saturated layers.
A Study on Additional Dynamic Effects after Members' Failure: Mechanism and Design Applications
Authors: Shi Yang Hang , Lou Qun
Published: February 2012

Regular anti-collapse analyses with dynamic factors to adjust static results are often not accurate enough. To solve this problem, theory of additional dynamic effects after members' failure (known as F-ADE) is discussed in this presented work with a study of two important parameters to reveal its mechanism. Theory of F-ADE explains why and how the results of regular anti-collapse analyses go inaccurate. Several safety measures for structure design are proposed based on the mechanism of F-ADE. Further researches are expected.
Kinetic Study and Equilibrium Isotherm Analysis of Cationic Dye Adsorption onto Attapulgite and Rectorite
Authors: Song Jing Yan , Yang Jing
Published: February 2012

The adsorption properties of the attapulgite and the rectorite were investigated by removal of a cationic dye, methylene blue (MB) from aqueous solution. The attapulgite and the rectorite were characterized by Fourier transform infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM). The analysis of the isotherm equilibrium data using the Langmuir and Freundlich equations showed that the data fitted better with Langmuir model. Pseudo-first-order and pseudo-second-order models were considered to evaluate the rate parameters. The experimental data were well described by the pseudo-second-order kinetic model. The results indicate that the attapulgite exhibited higher adsorption capacity for MB than rectorite and could be employed as a low-cost alternative in wastewater treatment for the removal of cationic dyes.
Forest Coverage Prediction Based on Least Squares Support Vector Regression Algorithm
Authors: Xiao Fang
Published: February 2012

Forest coverage prediction based on least squares support vector regression algorithm is presented in the paper.Forest coverage data of Heilongjiang from 1994 to 2005 are used to study the effectiveness of least squares support vector regression algorithm.The prediction results of the proposed least squares support vector regression model by using the training samples with the different dimensional input vector are given in the study. It can be seen that the prediction results of the proposed least squares support vector regression model by using the training samples with the 3-dimensional input vector have best prediction results.The comparison of forest coverage forecasting error between the proposed least squares support vector regression model and the support vector regression model is given, among which mean prediction error of the proposed least squares support vector regression model is 0.0149 and mean prediction error of the support vector regression model is 0.0322 respectively.The experimental results show that the proposed least squares support vector regression model has more excellent forest coverage forecasting results than the support vector regression model.
Study on Several Issues of the Infrared-Thermography Method on Detecting the Defects of External Wall
Authors: Jiang Ji Tong , An Jun , Fan Xiao Yi , Du De Run , Yang Song
Published: February 2012

In recent years, Infrared thermal imaging technology has been widely used in the detection of construction quality relied on its distinguishing features of non-destruction, non-contact and low cost. But, there are many problems in practice, such as it is difficult to quantify the detection results and determine the best testing time. Aimed to several issues of the infrared-thermography method on detecting the defects of external wall, this paper discusses the determination of the optimum time and puts forward a method which can decide the defects quantitatively; it is the method of temperature rise rate.
Finite Element Analysis on Flexural Fatigue Behavior of RC Beams Strengthened with CFRP
Authors: Wang Yu , Shen Yan Ni , Fan Xu
Published: February 2012

Numerical simulation methods were used in this paper , and the bending fatigue performance of reinforced concrete beam with CFRP by ANSYS were analyzed . the Fatigue Mechanism was studied , and obtained the raise the level of fatigue life of reinforced concrete beam with CFRP .The result shows CFRP can increase greatly its fatigue life and play a practical engineering guide.
Analysis on Causes of Crack in Multiple-Arch Tunnel
Authors: Qin Qin
Published: February 2012

This paper present a numerical simulation on multiple-arch tunnel crack, Analyzes the reason of multiple-arch tunnel cracking, summarizes the crack formation mechanism of multiple-arch tunnel and the influence factors of cracks, then some attention should be paid in multiple-arch tunnel design and construction.
Study on the Dynamic Interaction between Steel Primary Structure and Cable Curtain Walls Secondary Structure under Wind Load
Authors: Gao Dui Xian , Fan Yong Lei , Cui Xiao Ling
Published: February 2012

Cable curtain walls as a new maintenance system is being used more and more in modern structures, it is particularly important to research the interaction between the framework and support for cable truss structure. Select a layer of glass curtain wall with cable truss support system in this paper compared with a separate framework with Wind load analysis of the time domain to study the interaction
The Test Study of Shape Coefficient of Low-Rise Buildings Roof with Different Positions of Openings
Authors: Zhou Ji , Dou Yuan Ming , Liu Xi Yuan , Sun Ji Shu
Published: February 2012

The majority of low-rise buildings are generally susceptible to wind damage in previous wind disaster, thus it is necessary to gain understanding of the characteristics of wind pressure for these types of building. Based on Wind Tunnel Test, the shape coefficients were studied with pressure measurement on gable roofs laying aside purlin of low-rise building roof in this paper. Three aspects were arerespectively discussed: the lows of shape coefficients and the shape coefficient value with specific wind angle on roofs of the houses completely closed, the house opened doors and windows and the house opened the hole on roof with different wind angle. The laws of shape coefficients were propounded for low-rise buildings with different positions of openings in contrast to load code. A detailed analysis of the experimental results shows that the shape coefficients will increase notably when there are the openings on metope and on roof, and the one is outward of roof, another is inward of roof. It is expected that the results should be valuable for the wind-resistance design of low-rise buildings.
The Analysis of Indoor Formaldehyde Pollution Based on Model House Acceptable of a Finished Residence
Authors: Luo Xiao Liang
Published: February 2012

Through a Community Model House of Chongqing and a finished residential tower for indoor formaldehyde detection, first arrive at the result that the model House location, direction, and physical environments and furniture set state influence on indoor formaldehyde concentration, and set Model House and production house for indoor formaldehyde density contrast,determine the accuracy of finished residential tower interior formaldehyde product standards by analysing the Model House status in all situations. For implementing individual acceptance of finished products ,it can greatly reduce duplication of effort by judging indoor environment and avoid unnecessary waste of resources.It also played a great role in the health, fast forward to finished housing industrialization in China.
Test Research of Chloride Ion Penetration in Concrete Tunnel Lining Structure
Authors: Li Zhong , Zhu Yan Peng , Cui Xiao Yan
Published: February 2012

Chloride ion diffusion coefficient is an important indicator reflected the concrete durability in chloride erosion environment, and affects the service life of concrete structure directly. By the indoor test of chloride acceleration permeability, the chloride ions diffusivity is studied in the tunnel lining structure, and the variation law of the chloride content is tested with the change of penetration depth of different age specimen. Tests shows, with the increases of the penetration depth, the chloride content decrease gradually and finally tend to the initial chloride content of the specimen. Penetration time has a strong cumulative effect on the internal concentration of chloride ions in concrete, the high or low level of chloride ion concentration have a role of promotion or reduction for the chloride ion penetration in the concrete inside. The results provide an important basis for the predictions of service life of tunnel lining in chloride erosion environment.
Structural Damage Identification Using Improved Particle Swarm Optimization
Authors: Guo Hui Yong , Yuan Jun Sheng , Li Zheng Liang
Published: February 2012

In order to solve structural damage identification problem, a damage identification method based on improved Particle Swarm Optimization (IPSO) is presented. First, structural frequency and modal strain energy are utilized to obtain damage information. Then, evidence fusion theory is utilized to integrate the information and preliminarily identify structural damage locations. After the damaged locations are determined, Particle Swarm Optimization (PSO) is used to identify structural damage extent. Some improved strategies are presented to enhance the search efficiency. The simulation results demonstrate that the proposed method can estimate the damage locations and extent with good accuracy.
Study on the Application of Semi-Active Variable Stiffness Fuzzy Control System to a Residential Building
Authors: Wei Ping , Chen Hong Bing , Zhang Ya Ying
Published: February 2012

Based on a steel concrete building, this paper presents a study on the fuzzy control of building vibration. The building structure is simplified into layer model and is applied with a fuzzy control. Three membership functions, Gaussian, triangel and π shap, are used for the simulation. Three earthquake waves, El_centro, Taft and Tianjinghuanhe, are utilized as well. Nine operating modes are proposed for fuzzy control. A series of fuzzy control rules are designed with ground acceleration and mass point displacement being regarded as firstly important components. The simulation results show the control ratio of decreased displacement to the maximum displacement without control varies from 12.67% of Mode I to 36.33% of Mode G. The average control ratio is 23.99%. The fuzzy control system has a quite good control effect on building vibration.
Analytical Model for RC Beams with Externally Bonded Laminates Using Strut-and-Tie Method
Authors: Ng Chee Khoon , Tiong Alex Mee Kuei , Lau See Hung
Published: February 2012

An analytical model for RC beam strengthened with externally bonded laminates based on the strut-and-tie method is reported herein for predicting the strength and mode of failure of the strengthened RC beam. From the proposed model, four inequality equations were derived corresponding to four possible modes of failure. These four inequality equations define a safe domain. When the loading path up to the ultimate flexural limit state of a beam is plotted on the same diagram, the mode of failure and strength of the beam can be identified. The possible modes of failure consist of both flexure-type and shear-type failures. Flexure-type failure is due to the yielding of internal longitudinal reinforcement or the yielding of externally bonded laminates, whereas shear-type failure is due to the crushing of the diagonal compressive concrete strut or the yielding of the shear reinforcement. The failure mode initiated by one flexure-type followed by another is possible. Mode of failure initiated by one flexure-type followed by a shear-type is also possible but not otherwise. In short, this model describes the mode of failure and the corresponding strength of an RC beam strengthened with externally bonded laminates, which can be used to verify the adequacy of design for beam strengthening.
Operational Modal Test of an Arch Bridge
Authors: Zhang Xin , Du Xiu Li
Published: February 2012

A modal test was carried out on a 120m span concrete filled steel tubular arch bridge under operational conditions. The moving traffic load is considered as uncorrelated white noises at various points of the road surface and the test is of the type of multi-input multi-output (MIMO). The modal parameters are identified by Global Rational Fraction Polynomials (GRFP) method, a frequency domain method. In order to taking the mobile nature of the traffic load into consideration, a multi-input NExT method is utilized to retrieve the frequency response function needed by GRFP. A proof of the NExT method in the case of multi-input case is also provided in this paper.
The Rebound Curve Research of Inspection the High Strength Concrete
Authors: Chen Hai Bin , Lu Hui Dong , Ge Nan , Tong Xiao Jun
Published: February 2012

Since the nineteen nineties, high strength concrete technology was developing rapidly in our country. However, high-strength concrete detection technology is relatively backward. According to the characteristic of the pumping concrete in Tangshan area and the requirements of JGJ/T23-2001, The paper adopted representative materials of Tangshan to divide high strength concrete test blocks which strength grade is from C50 to C80 into 4 ages of 14 days, 28 days, 60 days and 90 days, then adopted high strength concrete rebound apparatus to experimental research by the rebound method. At last, the test data was collected, and applied regression analysis theory, then used the principle of least square method for regression analysis. The optimal pumping concrete strength rebound curve formula could be obtained.
A few Issues about Relieving Traffic Congestion of Cities by Improving Management Based on Foreign Mode
Authors: Li Qiu Han
Published: February 2012

In this paper, a few issues are discussed to solve traffic congestion problem in China, which include: city zoning, layout of traffic network, scheduling of working time and increasing road-using efficiency, which are successfully used in Canada and western countries. If the above measures are used in Chinese cities, the current traffic congestion situation can be relieved by improving management without increasing investment cost to much.
The Form and Features of Dispersive-Tube Structure
Authors: Jiang Ji Tong , Lu Pei Pei , Yang Song , Du De Run
Published: February 2012

This review describes the author's research progress of dispersive-tube structure, summarizes the basic concepts of dispersive-tube structure, the mechanical characteristics of concrete tube, and the wind resistant behavior with the seismic performance. Examples of related studies have shown that, dispersive-tube structure have significant advantages in the structural performance and economic performance.
Design and Analysis of Anchor Group under Eccentric Shear Loading
Authors: Sheng Qin Zhu , Xie Qun , Wang Xin
Published: February 2012

Adhesive anchors are widely used as post-installed fasteners in civil engineering. A typical steel-to-concrete connection includes multiple anchors which are commonly subjected to combined moment and shear loading. Based on the assumption that all anchors take up shear load, a revised method is developed for the design of ductile anchors, which considers that only the row of most stressed anchors in the tension zone are needed to meet the elliptical interaction of tension and shear capacity requirement during the design process of anchorage group under combined shear and moment loading. The ultimate strength of post-installed fastenings should be controlled by the strength of anchor steel for the purpose of connection safety and full utilization of anchor capacity. For the objective of ductile design in anchor group, the ratio of shear span could be used as an evaluation parameter in the process of strength prediction. According to the theoretical analysis and results comparison, the ductile failure of anchor steel in post-installed fastenings can be guaranteed when the ratio of shear span is greater than 0.6.
Optimal Design of Flat Tensegrity Structure Based on the Genetic Algorithm
Authors: Lu Cheng Jiang , Wang Xiao Dong , Wu Zhi Feng
Published: February 2012

Engineering application of the flat tensegrity structures was studied based on the genetic algorithm. Optimal design of the tensegrity structure considering both the size of cross-section and prestress variables is presented and the related optimization problems are studied. Mutual influence and constraints of prestressed state and components were considered.
Welding Residual Stress of Flange-Plate Steel Reinforced Connections
Authors: Wang Wei , Zhang Chang Hao , Wang Guan Feng , Zhang Juan
Published: February 2012

The welding joint method is usually applied in the reinforcing process of the steel moment frame connections. The welding parameters are chosen and discussed and the finite element analysis is employed to analyze the completely penetration joint weld between the flange plates and the column flange. The three-dimensional thermo-structure simulation is conducted. Furthermore, the influence of the residual stresses on the the loading capacity of the reinforced connection is discussed. The temperature field during the welding process and the residual stresses distribution are given. The existence of the welding residual will highly increase the likelihood of brittle fracture of the steel in the heat affect zone.
A Scientific Problem and Analytical Method for Structure Reinforcement
Authors: Jia Hong Zhi , Sun Jia Bin , Wu Yu Fei , Xu Xin Sheng
Published: February 2012

Beam reinforcement is reduced to mechanics behavior of structures of multilayer materials in this paper. An analytical method is presented based on Hamiltonian system. In the system, displacements and stresses are pairs of dual variables. The state vectors of the system describe directly connective conditions on the interfaces of two materials and structures so that the rule of normal and shear stresses on the interface can be revealed. Based on the criterion of lamination crack, the interface strength is determined. Results show that the lamination crack correlates highly with the ratios of material constants and geometrical parameters of structures. The result and conclusion provide a design criterion for structure reinforcement.
Spatial Convergence of Crack Prediction on Structured Mesh Based on Distributed Cohesive Element Method
Authors: He Ming Hua , Xin Ke Gui , Cui Ding Yu , Liu Yu Fei
Published: February 2012

We use the distributed cohesive element method to simulate the dynamic fracture in structural specimen and arbitrary crack path is predicted. The focus in on convergence of the cohesive crack path as an approximation of the real crack as the spatial characteristic mesh size h approaches zero. We propose the structured mesh is satisfactory in capturing the real crack shape as we refine the mesh because the crack Hausdorff distance converges. However, the length of cohesive crack path does not converge as the mesh is refined. There is a finite length deviation between predicted cohesive crack path and physically real crack path on structured mesh.
The Finite Element Model Study of the Pre-Twisted Timoshenko Beam
Authors: Chen Chang Hong , Huang Ying , Shan Jian
Published: February 2012

The paper studies a new mechanical model of pre-twisted Timoshenko beam. But it is different from the conventional Timoshenko straight beam; the proposed new Timoshenko beam element takes separate interpolation polynomial functions both flexure bending displacement and angular displacement. According to the relationship between bending moment and shear, the relationship between of bending displacement and angle displacement is derived, more accurate to consider the effects of shear deformation, come up with a new initial reverse Timoshenko beam element stiffness matrix. Finally, by calculating the pre-twisted rectangle section beam example, and contrasting three-dimensional solid finite element using ANSYS, the comparative analysis results show that pre-twisted Timoshenko beam element stiffness matrix has good accuracy.
Effect of High Pressure on Dynamic Compressive Strength of A95 Alumina Ceramics
Authors: Yao Guo Wen , Li Yan Jun , Feng Xiao Wei
Published: February 2012

The dynamic strength expressions of materials were reviewed in case of one-dimensional strain shock loadings in this paper, the effects on the strength were suggested to be considered of hydrostatic pressure and high strain rate. A modified form for the Hugoniot Elastic Limits was given associated with the Drucker-Prager yield criterion, the effect of hydrostatic pressure being included. Free surface velocity histories of particle were measured by VISAR system in plate impact experiments on alumina with a Light Gas Gun. The experimental determination of dynamic strengths of alumina was discussed and the open problems were clarified. By comparing the strength expressions of ceramic materials with the experimental results, the evident differences were pointed out. Their analysis and discussion were further given for the experimental phenomenon.
Study of Mechanical Property of Column with Construction Seam
Authors: Dong Jin Ming , Yan Xi Kang , Zhao Guo Liang
Published: February 2012

During an earthquake, many construction damage for columns, not for the beam. This does not meet the standard design.This paper, we will study the phenomenon such as any and construction joint. There nine specimens, divided into three groups. Every group has three specimens, the first no construction seam, the second simple processing In construction joints, the third has good processing construction three groups will be loaded axial compression coupling than 0.23, 0.34, 0.46. This paper will study the differece of different processing construction joint limit bearing capacity, energy consumption and stiffness degradation.