bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved Control Strategy of Wind Turbine with DFIG for Low Voltage Ride through Capability
Authors: Sun Li Ling , Fang Dan
Published: December 2014

As the number of doubly fed induction generator (DFIG)- based wind-turbine systems continues to increase, wind turbines are required to provide Low Voltage Ride-Through (LVRT) capability, especially under the condition of grid voltage dips. This paper, depending on the operating characteristics of doubly-fed induction generator during grid faults ,deals with a protection and control strategy on rotor-side converter (RSC) to enhance the low voltage ride through capability of a wind turbine driven doubly fed induction generator (DFIG). The simulation and experiment studies demonstrate the correctness of the developed model and the effectiveness of the control strategy for DFIG-based wind-turbine systems under such adverse grid conditions.
A New Scheme Based on Climbing Method for Maximum Photovoltaic Power Tracking Control
Authors: Xu Bo Qiang , Li Jin Bo
Published: December 2014

The maximum power point tracking (MPPT) of photovoltaic arrays can increase the output power of the photovoltaic systerm, improve the utilization of solar energy. This paper describes the output characteristics of the photovoltaic arrays and the principle of maximum power point tracking,then,based on Incremental conductance method, proposes a sub-type of the variable step size MPPT algorithm. simulated using MATLAB/Simulink, the final results show that the proposed algorithm is able to quickly track the maximum power point and power concussion problem has been significantly improved.
An Overview of the Finite Element Method on the Tool-Soil Interacting Problem of Tillage
Authors: Liu Xiao Hong , Yu Yan , Qiu Li Chun
Published: December 2014

This article introduced the up-to-date research progress on the tool-soil interacting problem of tillage; and investigated the situation of constitutive relation usage in the finite element method (FEM). A review including the dynamic effect on the performance of tillage operation with FEM has been conducted. It showed that the virtual reality method with FEM had made much progress in evaluating the tool draft, distribution position of stress and strain, displacement fields and acceleration in soil-tool interactions, soft ware package of computer aided design of tillage tools; it will be a low cost and high efficiency assistive tool in the development procedure of tillage tools, and can be applied to study and analyze the performance of resulting prototypes.
Applied-Information Technology in the Homework System Founded on ActiveX Components
Authors: Zhao Dong Ming , Zhu Kai Feng
Published: December 2014

The arrival of information age means the change of teaching and learning methods, with the development of computer technology, multimedia technology and network technology, the teaching mode of interaction through the network are also popular to carry out gradually. Changes have taken place in teaching methods, teaching means, teaching form and teaching idea through the application of computer in teaching. Distance education, online examination system, the development of online learning system and online homework system greatly promote the development of the educational business and also bring a huge change to modern education, profoundly affected the modern teaching domain. Applied-information technology plays an increasingly important role in contemporary teaching. To study the application of applied-information technology in teaching research has important theoretical and practical significance.At the same time of computer aided teaching, the arrangement and correcting homework are particularly important for checking the teaching achievements and the degree of students what have mastered.
Data Processing in Square Zero Preservers on Spaces of 2x2 Trace Zero Matrices
Authors: Song Shuo , Chen Shao Bai , Zhang Yang
Published: December 2014

Scientific data processing "usually involves a great deal of computation (arithmetic and comparison operations) upon a relatively small amount of input data, resulting in a small volume of output." In this view, matrices play very important role.Suppose F is a Field of Characteristic Not 2, and F* is its Subset of all Nonzero Elements. Let M2 be the Space of all 2*2 full matrices over F . A matrix A M2 is called square zero if A2=0 . Let be the Subset of Consisting of all Square Zero Matrices and be the Linear Space of all Trace Zero Matrices over . we Denote by the Set of all Maps from to itself Satisfying if and only if for Every and . it was Shown that if and only if there Exists an Invertible Matrix and such that for Every .
Improved COPRAS Method and Application in Material Selection Problem
Authors: Xia Fei , Wei Huan , Yang Lian Wu
Published: December 2014

The aim of this paper is to put forward a new material selection method based on COPRAS method. The method combines the COPRAS method and coefficient of variation method. The new method is simple and easy to use, and coefficient of variation method can objectively determine the attributes weights. Thus it can be easily accepted by decision makers. Finally, a practical example is used to demonstrate the feasibility and effectiveness of the proposed method.
Research on Calculation of Equivalent Damping Ratio of Electrical Transmission Tower-Line System with Viscoelastic Dampers
Authors: Zeng Cong , Hao Dong Xue , Hou Li Qun
Published: December 2014

Installing viscoelastic dampers on electrical transmission tower will significantly reduce the wind-induced vibration response of electrical transmission tower-line system. On the basis of the concept of strain energy method with the combination of related codes and the theories of calculation for equivalent damping,a mothed is presented which is used to estimate the additional damping of electrical transmission tower-line system with viscoelastic dampers.Through a electrical transmission tower with viscoelastic dampers, based on the formula of strain energy in design code,this paper puts forward a calculation method of equivalent damping ratio based on the concept story of transmission tower,and through finite element model the responses of transmission tower with viscoelastic dampers model and the one with additional damping ratio model were compared.The simulation results show that the calculation method of equivalent damping ratio has high precision,and the errors are less than 5% in multi engineering conditions.
Preservation of Archaeological Leather by Reinforcement with Styrene Butadiene Rubber
Authors: Rabee Rushdya , Ali Mona F. , Fahmy Abdel Gawaad Ali , Halim Sawsan Fakhry
Published: December 2014

Leather has been used in Egypt since 4000 BC. Ancient Egyptians used leather as shrouds, bookbinding and manuscripts. This research aims to find a way to protect archeological leather from damage by environmental factors, without losing their archaeological appearance. Leather samples were subjected to ageing in order to simulate archaeological leather. Styrene butadiene rubber was used to coat the leather samples. Then the leather samples were dipped (immersed) in a bath containing SBR dissolved in toluene with concentrations varies from 1 to 5% by weight. The effect of leather/ SBR reinforcement was evaluated by Fourier Transform Infrared Spectrometry (FTIR) and measuring the mechanical properties (tensile strength and elongation at break (%), color difference (ΔE) and lightness (L), pH value before and after ageing. In addition, Scanning Electron Microscope (SEM) was used to study the surface morphology of samples. Finally, all samples were subjected to ageing after reinforcement. The results revealed that reinforcement of leather samples by SBR solutions having concentration 3 % gave the best results among other concentrations. The mechanical properties of treated samples were enhanced with reduction in the ΔE values. The results also showed that the pH values of the treated samples did not change even after further aging. SEM scans evidenced that SBR filled the leather surface cracks besides the formation of a protective layer on the leather surface.
Micro Fluidic Oscillator: A Technical Solution for Micro Mixture
Authors: Dennai Brahim , Bentaleb Abdelhak , Chekifi Tawfiq , Khelfaoui Rachid , Abdenbi Asma
Published: December 2014

The diffusion flux given by the Fick’s law characterizethe mixing rate. A passive mixing strategy is proposed to enhance mixing of two fluids through perturbed jet low. A numerical study of passive mixers has been presented. This paper is focused on the modeling of a micro-injection systems composed of passive amplifier without mechanical part. The micro-system modeling is based on geometrical oscillators form. An asymmetric micro-oscillator design based on a monostable fluidic amplifier is proposed [2,7]. The characteristic size of the channels is generally about a few hundred of microns. The numerical results indicate that the mixing performance can be as high as 99 % within a typical mixing chamber of0.20 mm diameter inlet and 2.0 mm distance of nozzle - spliter. In addition, the results confirm that self-rotation in the circular mixer significantly enhances the mixing performance. The novel micro mixing method presented in this study provides a simple solution to mixing problems in microsystem.
High-Temperature Synthesis of Composite Material from Al-SiO2 System Components
Authors: Apakashev Rafail , Davydov Stanislav , Valiev Niyaz
Published: December 2014

The research involves studying the high-temperature chemical interaction of the Al-SiO2 system components. The high-temperature interaction of molten aluminum and silicon dioxide results in formation of aluminum matrix composite material containing silicon microparticles. The predominant linear size of silicon microparticles amounts to 3 - 5 microns, their mass fraction in the composite reaches 29 %.
2D Woven Reinforcements of Natural Fibers
Authors: Manins Maris , Bernava Aina , Strazds Guntis
Published: December 2014

For a variety of applications it is desirable to produce textile materials with specially designed properties. The aim of this work is focused on production methods of 2D woven reinforcing structures and studies of mechanical properties of produced reinforcements from renewable natural fibers - hemp and flax yarns. Results and discussion are presented in the research paper.
Effect of the Nature of the Layer of Conductive Polymer Composite on the Effectiveness of a Multi-Layer Electromagnetic Shielding
Authors: Ansri A. , Hamouni M. , Khaldi S.
Published: December 2014

The purpose of this communication is to study the effect of the nature of the polymer layer on the electromagnetic shielding effectiveness of a multilayer organic based composite material. Our work is divided into two parts. In the first part, we set different layer thicknesses and the frequency is varied. In the second part, we set the frequency and do vary the nature of the polymer layer and the thickness of the different layers. The different results obtained we show that the efficiency is strongly influenced by the nature of the polymer layer.
Analysis for Pure Bending Performance of Circular Steel Tubular Columns Filled with Steel-Reinforced High-Strength Concrete
Authors: Guan Ping , Chen Lan Xiang
Published: December 2014

This paper is about a new steel tubular columns filled with concrete.
Test Study on Seismic Performance of Cantilevered Vertical Irregular Model Frame Structure
Authors: Chen Si Tian , Xu Jie , Xie Hong Hui
Published: December 2014

This paper is a seismic response study on a vertical irregular frame structure which has a cantilevered top floor. Aimed to analyze the features of seismic response for a vertical irregular frame and scaled model, dynamic time history analysis and shaking table test have been carried out by use of the earthquake waves recorded in WENHUAN earthquake. It shows that the results of dynamic time history analysis and shaking table test are in good agreement, and the earthquake influence coefficients obtained by dynamic time history analysis and shaking table test are larger than the value according to Code, which indicates that the results would be not secure if the simplified methods specified in Code only in the sight of the calculation of earthquake loads.
Dynamic Response Analysis for the Frame Structure under Explosion Load
Authors: Sun Yan , Shen Shan
Published: December 2014

The dynamic response process for the reinforced concrete frame under different peak value of explosion load was simulated by the general finite element software SAP2000, followed by the comparative analysis on the displacement of the beams and columns under each condition. The analysis results show that the displacement of the beams and columns suffering the explosion load directly is ten times or even dozens of times more than those far away from the explosion load, which makes it clear that the explosion load influence on frame structure has a certain locality.
Finite Cylindrical Cavity Expansion Model for Penetration of Steel-Tube-Confined Concrete Targets
Authors: Cao Yang Yue Ye , Jiang Zhi Gang , Tan Qing Hua
Published: December 2014

Concrete is a brittle material which cracks under the tension and pulverized when the compressive stress exceeds the ultimate compressive strength. Confined concrete performs better than that of concrete without confinement in resisting penetration. Based on the Griffith strength theory, a quasi-static cylindrical cavity expansion model for the penetration of steel-tube-confined concrete targets is proposed. Numerical results show that ratio of tube wall thickness to tube radius significantly effects cavity expansion stress, which is in proportion to the former ratio. The results are in good agreement with the cavity expansion process.
Influence of Wall Thickness and Concrete Grade of Shear Wall Amount
Authors: Wang Liang , Shi Jun Feng , Yu Tian Qing
Published: December 2014

Engineering examples and finite element structural analysis software SATWE was used to calculate by adjusting the shear wall thickness and grade to study the dynamic characteristics of concrete structures; analysis of seismic shear, natural vibration cycles, maximum interlayer displacement angle, lateral displacement stiffness to weight ratio and shear weight ratio of these parameters change rules, resulting in changes in shear wall thickness greater impact on shear wall amount.
Lateral Equivalent Flexural Rigidity for a Top-Hat Stiffened Composite Plate under Pure Bending
Authors: Zhu Li Bao , Zhang Xiang Ming
Published: December 2014

This paper is concerned with the analytical solution to lateral equivalent flexural rigidity for fiber-reinforced top-hat stiffened composite plate subjected to pure bending. The plate is divided into three parts consist of single-laminate, double-laminate and hat-laminate. After computing equivalent flexural rigidity of the three parts respectively, the overall rigidity is calculated based on the equality of relative rotation angle. An example has been adopted for analytical calculation and then been modeled by finite elements method. A comparison was made to verify the validity of analytical method.
Nonlinear Dynamic Response of Piezoelectric Beam Reinforced with BNNTs under Electro-Thermo-Mechanical Loadings
Authors: Yang Jin Hua , Fan Wen Liang
Published: December 2014

This paper presents an investigation on the nonlinear dynamic response of piezoelectric beam reinforced with boron nitride nanotubes (BNNTs) under combined electro-thermo-mechanical loadings. By employing nonlinear strain and utilizing piezoelectric theory, the constitutive relations of the piezoelectric beam reinforced with BNNTs are established. Then the dynamic governing equations of the structure are derived through variational principle and resolved by applying the finite difference method. In numerical examples, the effects of geometric nonlinear, voltage etc. on the nonlinear dynamic response of piezoelectric beam reinforced with BNNTs are discussed.
Application of Back Analysis Method in Selecting Shear Strength Parameters for Hutoumao Landslide
Authors: Li Yong Jun , Liu Chao , Su Li Jun
Published: December 2014

Laboratory experiment and back analysis are common methods for selecting shear strength parameters. However, every way has its shortcomings. A way combining two methods is used to determine shear strength parameters for Hutoumao landslide. The result can meet the need of project according to comparison experience value.
Study on Section Temperature Field of Concrete-Filled Double Steel Tubular Columns under Fire
Authors: Cong Shu Ping , Li Teng , Han Jin Sheng
Published: December 2014

Finite element model was built in order to study the section temperature field of concrete-filled double steel tubular columns through the software of ANSYS. Moisture of concrete and thermal contact resistance were considered in the model. Based on the Eurocode 2, specific heat of concrete was modified in order to consider the effect of moisture. Contact elements were created in the interface between steel tube and concrete in order to consider the effect of thermal contact resistance. The effects of diameter of steel tube and type of aggregate to section temperature field were studied. Distribution of section temperature field is given on the concrete-filled double steel tubular columns, which provides the basis for the analysis of fire resistance capability.
Experimental Study on Flexural Performance of Prefabricated RC Slabs with Different Rebar Forms at Seam
Authors: Zheng Hong Yu , Jiang Huai Yan , Wu Yan Qing , Zhao Zhi Qiang , Zeng Yong Chun , Cheng Xiao Hui
Published: December 2014

Four pairs of prefabricated reinforced concrete slabs were designed, cast, cured, assembled and test to investigate the flexural performance of prefabricated underground thin-wall box RC structure. One traditional integrated slab specimen with same size, material and reinforcement was also cast and test for comparison purpose. Four rebar constructional forms were conceived to compare the ability of transferring tension force between two slabs. Symmetric two-points monotonic static load test were performed to attain their flexural performance. The test results indicates: the prefabricated RC slab can provide better deformability and ductility, but the flexural bearing capacity is lower, comparing with cast-in-situ integrated RC slab; steel rebar form at seam have some effect on the flexural bearing capacity of prefabricated RC slab.
Shear Strength of Reinforced Concrete Frame Column by Neural Network Model
Authors: Liu Xi , Wei Hui , Wu Tao , Liu Bo Quan , Zhang Yu
Published: December 2014

The artificial neural networks (BP-ANN) established by the back-propagation algorithm and early stopping technique. By inputting the properties of geometries and material, BP-ANN model can predict the ultimate shear strength of reinforced concrete frame column. The BP-ANN model based on feed-forward neural network is built, trained and tested using the available test data of 82 RC frame column collected from the technical literature. And the test results are compared and analyzed with predictions based on the current the code of China and ACI code. It shows that the reinforced concrete frame column shear strengths obtained by the simplified model based on BP-ANN are in good agreement with test results, and they are closer to the experimental values than the results designed by models in codes. The BP-ANN model can be used in the shear strength prediction and design for reinforced concrete frame column.
The Analysis of Comparison of the 1000KV UHV Electrical Equipment and Circuit
Authors: Gao Po , Lu Zhi Cheng , Zhu Zhu Bing , Lin Sen
Published: December 2014

The single UHV electrical equipment and numerical model for its circuit would be established by the Ansys software, after respectively analyze the Earthquake acceleration response spectrum of all the models, the stress distribution of equipments of all numerical model and its top displacement results would be get. By comparing the differences of every model’s result and focusing on the load-carrying properties of the structure, the experiments would get further optimizing space and confirm the circuit connection mode that is favorable for the Seismic resistance. After the comparison of single equipment and circuit results, it is suggested to establish a complete circuit numerical model while analyze and verify the converting station.
Research of Masonry Shear Strength under Shear-Compression Action
Authors: Cai Yong , Shi Jiu Long , Yang Wen Chao , Lv Xiao Yong , Li De Jian
Published: December 2014

The failure criteria and calculating methods of static and seismic shear strength of masonry under combined shear-compression action have been researched in this paper. According to the least energy consumption principle and the failure criteria of orthogonal anisotropic materials, the correlated formulae of masonry under combined shear-compression action are established. The correlated formulae are in good agreement with experimental results. On this basis, the calculation formulae of the static and seismic shear strength are established. The calculation formulae uniformly use the axial compression ratio as main variable to express. By analyzing examples, it shows that calculations by formulae given in this paper are in accordance with values of "Code for design of masonry structures" (GB 50003-2011) and "Code for seismic design of buildings" (GB 50011-2010). The methods in this paper may provide important references to engineering design as well as code revision.
Flexural Behaviour of Stainless Steel-Concrete-Carbon Steel Circular Concrete-Filled Double Skin Steel Tubes
Authors: Cao Ming , Wang Rui
Published: December 2014

In order to improve the traditional concrete filled steel tube's corrosion problems,when it uses as holding column of offshore platforms and as support bar of long-span bridges,this paper mainly studies stainless steel-concrete-carbon steel circular concrete-filled double skin steel tubes's flexural behaviour. Six specimen's tests were carried out.The main parameters varied in the test were the hollow ratio (χ) was 0.45 or 0.69,and shear span ratio (λ) was 1 or 3.The experiment results show how the hollow ratio and shear span ratio effect specimens' ultimate flexural capacity.Also,the experiment results provide experimental basis for structure design.
Research of the Stainless Steel-Concrete-Carbon Steel Circular Concrete-Filled Double Skin Steel Tubes under Axial Compression
Authors: Duan Zhen Kai , Wang Rui
Published: December 2014

Concrete-Filled Steel Tube with high capacity, good ductility and toughness, convenient construction, good fire resistance and other advantages. Currently[1] . Concrete-Filled Steel Tube structure has been widely used in the basic components and the overall structure of behavioral research has made many achievements. There are many advantages of concrete pipe above, but it also has fatal flaws, Stainless steel steel that is the difference[2]. The stainless steel has a beautiful appearance, durability, corrosion resistance, low maintenance costs, good fire resistance and other advantages. New stainless steel pipe concrete structure has both ordinary steel concrete good mechanical properties and excellent durability of stainless steel, can be widely used in buildings and bridges of the marine environment as well as some of the high durability and aesthetic requirements important building structures. Based on the outer stainless steel hollow sandwich - the carbon steel pipe shaft of light pressure test concrete results of load and displacement of the structure, variation of load and strain, and the impact of the empty heart of these parameters.
Research on the Synchronous Lifting Process Control of Large-Span Pre-Stressed Double-Layer Suspended Cable Roof
Authors: Yao Chuan Qin , Ma Hai Bin , Bai Rong , Jiang Shao Xin
Published: December 2014

Based on the project of Foshan International Home Expo City, this paper studied the control measures of the synchronous lifting process control of large-span pre-stressed double-layer suspended cable roof, and summarized some key points, which could be used as the common reference for the similar projects.
A Simple Design Procedure of Seismic Reinforcement Structure with Mild Steel Dampers
Authors: Huang Zhen , Qin Zuo Wei , Wu Peng
Published: December 2014

This paper presents a reinforcement design of five-story R/C structure with mild steel dampers in high seismic fortification intensity site. The details of the design process are listed in the paper, and the time history analyses under frequent and rare earthquake are performed on structure models with and without dampers. Through the comparison, the peak of maximum story drifts angles with damper-added structural is reduced by 38% and the distribution is more uniformly. The results show that energy-dissipation design with mild steel dampers can be a reliable and effective method in reducing seismic responses of reinforcement structure.
Study on Characteristics of Seismic Ambient Shear Stress in Gansu Province
Authors: Tian Xiu Feng , Zhang Xuan , Pu Ju
Published: December 2014

The breeding and occurrence of earthquake closely related to the intensity and spatial distribution of ambient shear stress field. Earthquakes would happen when the regional shear stress enhanced to the damage limit of rocks. In this paper, we used some acceleration records in Gansu province, and calculated corresponding seismic shear stress value according to the theory put forward by Professor Chen Peishan. Combined with the tectonic environment, we discussed the relationship of ambient shear stress with the magnitude and hypocentral depth.
The Seismic Finite Element Analysis of Tianjin Western-Style Dwellings
Authors: Yao Xin Qiang , Sun Bai Tao , Zhou Qiang , Chen Yu Kun , Yang Xu Lian
Published: December 2014

The natural frequency of model was analyzed by finite element software in the first and the result was consistent with the experience formula. Then, time history of ground motion was inputted. The seismic capacity of the structure was analyzed by parameters as structural damage, seismic shear and acceleration. Structural damage in seismic “three levels” and the results of seismic appraisal were consistent. The injury site structure put forward strengthening measure of circle beam and structural column. Scientific basis and technical support for seismic strengthening were provided for Tianjin Western-style dwellings.
Some Remarks on Single-Channel and Multi-Channel Seismic in Offshore Engineering Geological Exploration
Authors: Meng Qing Sheng , Li Hong Li , Liu Tao
Published: December 2014

Single-channel and multi-channel seismic exploration have become two important geophysical methods in offshore engineering geological investigation. Both of the two methods can present high sensitivity and high resolution information about the strata under the seafloor. However, the single-channel seismic prospecting method has some limitations in high resolution engineering surveys. For example, (1) When the depth of water is relatively shallow, the system cannot get zero offset profile; (2) The reflective events will be distorted if the terrain of the seafloor is complex, and thus make the interpretation much more difficult; (3) We cannot remove the influence of the complex multiples in single-channel seismic data processing; (4) We cannot get the lithological and physical properties directly using single-channel seismic method; and, (5) The spatial resolution of single-channel is also lower than that of multi-channel seismic method. In this paper, we presented some examples, and the above problems have been discussed to compare the two methods. All those can give a good guide for selecting appropriate exploration methods.
Application of Marine Geotechnical Investigation and Analysis Techniques in Salvage Project
Authors: An Yong Ning
Published: December 2014

Marine geotechnical investigation techniques provide important support for maritime salvage project. when using the new technology of pile rooting to righting shipwrecks, marine geotechnical investigation can provide a detailed physical and mechanical properties with reasonable parameters, and then use of splines curves and inverse distance weighting method to apply parameters to each pile, then analysis of the vertical uplift and compressive bearing capacity based on API standard, analysis of the level of resistance and strain relations based on P-Y curve method, predict drivability of piles and so on.
Study on the Performance-Based Aseismic Design for RC Frame with Mild Steel Shear Damper
Authors: Huang Zhen , Li Rui Qiu , Yang Lin Zhi
Published: December 2014

The performance-based design of structure can reach the performance objectives under different earthquakes. Mild steel shear dampers (MSSDs) have a good and stable energy dissipation capacity, and are widely used in seismic reduction structure. This paper presents a performance-based aseismic design method for RC frame with mild steel shear dampers, the numerical model of frame was established by SAP2000, then seismic performance of the frame was studied by time history analysis. Compared with pure frame, the inter-story drift ratio of MSSD frame is significantly decreased under frequent, moderate and rare earthquake respectively, and the performance objectives are satisfied, demonstrating the effectiveness of the performance-based aseismic design method.
Determination of the Spatial Distribution Function of Bohai Seismic Tectonic Area
Authors: Xie Zhuo Juan , Lu Yue Jun
Published: December 2014

The spatial distribution function assigns seismicity parameters of seismic zone and belt to the potential earthquake source area seismic by the magnitude interval, determination of the spatial distribution function is one of the key technologies to comprehensive probabilistic seismic hazard analysis methods, and the results will directly influence seismic hazard analysis results of the calculated sites. However, the spatial distribution functions are hard to get by statistics due to serious lack of seismic samples, and evaluation factors used in the actual work are too complex and not independent, the spatial distribution function is lack of reliability. In this paper, Bohai seismic tectonic area is chosen as an example; geological data are obtained from the newly built offshore oil platform engineering in recent decades, while seismic activity data are obtained by checking from historical difficult seismic parameters. Five factors are adopted in this area, including potential seismic focus area, seismic tectonic, seismic activity level, long-term forecasts, and strong earthquake recurrence interval and construct empty segment. Spatial distribution function of Bohai Sea earthquake structure area is obtained by weighted comprehension; it reflects the spatial and temporal heterogeneity of seismic activities in the area, and provides the calculation parameters for the probabilistic seismic hazard analysis.
Novel Linear Implicit Integration Method and its Application to Linear/Nonlinear Structural System
Authors: Jia Chuan Guo , Liu Yan Xing , Li Ying Min , Liao Min Mao
Published: December 2014

Dynamic simulations of structures to determine their seismic performance is an essential part of civil engineering research. Time integrators of increasing sophistication has been elaborated over the last few decades to achieve higher order accuracy, unconditional stability, computational efficiency and high-frequency dissipation. This paper tries to extend 1-stage Rosenbrock-based integrator to an integrator of second-order accuracy without losing computational efficiency and unconditional stability. Initially, 1-stage Rosenbrock integrator is introduced and its order of accuracy is studied theoretically. According to accuracy analysis, a force term at the end of current step is considered, resulting a novel integrator of second-order accuracy. Moreover, the stability of the proposed method is studied by means of the energy method. To investigate its performance for nonlinear structures, numerical simulations are conducted on a shear-type structure including a pendulum.
Construction Technology of Long Spiral Bored Piles
Authors: Zhao Yu Hong
Published: December 2014

Through the construction process of the Administrative Center Station, Kunming rail traffic, study the construction technology of long spiral bored piles, for engineering characteristics and difficulties, put forward the proposed measures, and analyze the application prospects of the technology.
The Construction Technology of the High-Rise Shear Wall Angles of the Concave and the Convex
Authors: Cheng Xian Feng , Li Ming Shan
Published: December 2014

In shear wall construction formwork, the traditional way of construction quality of yin yang angle is not ideal, so we made improvement of the construction technology, angles of the concave and the convex using bamboo plywood, the formwork edge using wood, outside steel pipe outside by welding connection.
Study on the Development of Green Building Industry in Anhui New Urbanization
Authors: Wang Qing , Chen Li
Published: December 2014

With the rapid development of Chinese economy, Chinese urbanization rate increased from 30% in 1996 to the initial stage of 53.7% in 2013. The urbanization rate in Anhui in 2013 was 47.86%, which reflects that the level of socio-economic development of Anhui still need to constantly enhance and accelerate the process of urbanization. Green building industry as the strongest driving force of new urbanization, how to promote the development of green city has become a top priority of all work for housing construction. In this paper, through study on environmental analysis for green building industry in Anhui, regression analyse the market demand for green building industry. Finally, put forward some strategies for the development of green building industry in the process of new urbanization in Anhui.
The Modern Green Technology Innovation of Bayu Traditional Wooden Building
Authors: Dong Li Li , Lu Yin Hang , Chen Guo
Published: December 2014

Wooden buildings have the advantages in accordance with the construction of sustainable development. The humid and rainy local climate and diversified geographic condition in Bayu give birth to its unique farming civilization of wooden architecture. This paper is trying to research how does Bayu traditional wooden building to meet the demands from people’s modern lifestyle, to provide a reference of designing modern sustainable architecture and a idea of design proposal. To achieve the aim, first this research will analyze few natural attributes of Bayu wooden building for moisture-proof, insect prevention and fire protection. Second to estimate how to enhance the sustainability of wooden building though reduce pollution, improve material quality, in order to get the optimization design of lap and nodes, decrease the energy cost and upgrade structure potential; Finally to explore the possibility of mix-using both wood and regional materials to improve the ecological environment.
Strain Transfer Analysis of FBG Sensors Bonded on the Surface of Structure
Authors: Song Hong Wei , Qin Li Kun , Zuo Xue Yong , Li Yuan
Published: December 2014

Health monitoring of civil engineering has been widely required in construction, operation and service-life prediction. FBG sensors, a kind of the most efficient sensing elements, for the superior advantages of small size, high sensitivity, long-term stability and durability, good geometrical shape-versatility, corrosion resistance and anti-electromagnetic interference, are highly applied in different engineering fields. Measurement precision of this sensor is paid attention and strain transfer analysis is developed to give an explanation on the testing mechanism and provide the quantitative strain transfer error modification functions. Theoretical derivation on strain transfer analysis of sensors with debonding interface is executed and related functions have been offered to eliminate the strain transfer error. Research in this article is meaningful for improving the precision of FBG sensors with debonding interface, which is helpful for much long-term detection of structures.
Survey Analysis on Construction Pattern of Low Carbon Building in New Countryside of Nanbu County
Authors: Guo Zi Hong , Wei Yi , Gao Mao Xiang , Yao Xin , Deng Jie
Published: December 2014

In order to statistically analyze building conditions of low carbon building in new countryside of Sichuan province, we conduct an investigation of construction application in new countryside of Nanbu County, especially energy saving along with energy utilization, water saving along with water resource utilization and material saving along with material resource utilization. According to the investigation, it is crucial to increase market share of clean energy like natural gas and solar energy as well as popularize biogas utilization or solar energy utilization by means of subsidizing farmers in the hope that firewood or coal will be significantly reduced. The survey also reveals that water supply in new countryside is mostly by pipeline or sometimes by well. While government is supposed to establish long-term mechanisms on how to effectively supervise sewage discharges and treat sewage in the new future. In terms of the circumstance where solid bricks is extensively used in new countryside, city planners and builders should optimize construction scheme, introduce advanced technology to improve construction environment fundamentally.
Bursts Detection in Water Distribution Networks Based on Real-Time State Simulation
Authors: Zhang Hui , Huang Ting Lin , Cao Mei Hua , Xu Jin Lan
Published: December 2014

Based on the improved weighted-least-square model and fuzzy similarity ratio method, a methodology is proposed to detect pipe bursts in real-time. When SCADA data is obtained DFP algorithm is used to get the real network state. Then the real values of burst characteristics are computed. And the hypothetical values assuming each pipe as the accident pipe are calculated for comparison. The fuzzy similarity ratio method is used to judge whether there is a pipe burst. If there is, the hypothetical value that is most similar to the real value is the accidental state and the corresponding assumed break is the burst location. According to the methodology a software system is developed with Delphi 7 for verification. The running results of a designed network show that the methodology is reliable and its detection accuracy is over 45%.
Modelling Construction Dust Safety Distance
Authors: Wu Min , Tang Wai Ching , Chen Guang Wei , Chen Shuo , Qin Zhi Dan , Zhou Yan , Wang Yin , Davis Peter , Sher William D.
Published: December 2014

Construction dust may lead to Silicosis, a disabling respiratory disease which severely threatens the life of construction workers. Therefore, it is important to predict and determine the safety area of dust generated by the construction process and the corresponding protective measures that must be adopted. In this paper, based on real site data, we modelled and simulated the pneumatic drill holes in rock drilling processes to analyze the dust distribution on construction sites. Our simulation results show that the dangerous distance from the pneumatic drill hole is 3.5m. Within the dangerous distance, the dust concentration ranged from 0.039 mg/m3to30mg/m3, and decreased as distance increases. Within the dangerous distance, dust alleviation technologies are strongly recommended and appropriate protective measures must be adopted by construction workers.
Application of RFID Technology in Asphalt Pavement Construction
Authors: Han Li Zhi , Li Si Li
Published: December 2014

This paper discusses Radio Frequency Identification (RFID) technology and its potential applications in the asphalt pavement construction industry. RFID technology offers wireless communication between RFID tags and readers. These fundamental properties eliminate manual data entry and introduce the potential for automated processes to increase project productivity, construction safety, and project cost efficiency. Construction contractors, owners, and material suppliers that believe technology can further develop methods and processes in construction should feel obligated to participate in RFID studies for the advancement of the construction industry as a whole.
Advances in Modification of Polymer Membranes with Inorganic Nanoparticles
Authors: Huang Wan Fu , Liang Juan , Li Xin Dong , Wang Xiao Feng
Published: December 2014

Membrane separation technique is widely applied because of simple operation, high separation efficiency, and no induction of phase transformation, but it is restricted from some fields by the high pollution, low strength and small flux of polymeric membranes. Improving the performances is one major way to expand the applied fields of polymer membranes, and so far, it has been realized by introduction of inorganic hybrid nanoparticles into polymer membranes. Inorganic nanoparticles can modify the surface and structural properties and largely improve the hydrophilicity, contamination resistance and rejection performance of membranes, and thus expand the adaptability of polymer membranes. In this review, we summarized the advances in modification of polymer membranes with nanomaterials including nanoZnO, nanoAg, nanoTiO2, nanoSiO2 and multi-walled carbon nanotubes (MWNTs). The prospects in the future development are finally provided.
Conduct Research for Thermal Aging Reaction of SBS Modified Asphalt by Applications for DSR
Authors: Tian Shuai Tuan , Tang Feng
Published: December 2014

SBS modified asphalt has good abilities to resisting pressure of high or low temperature and rutting in areas where changes of temperature is large. In our country,It is one of the important engineering materials which can solve the problem of heavy traffic on asphalt pavement and rutting in long and steep roads.In order to deeply understand the changes of rheological properties during the Thermal aging reaction of SBS modified asphalt,under different temperature conditions.regarded 90 # asphalt with CNOOC as lateral reference standard, Systematic study has been applied on the rheological properties of SBS modified asphalt and 90 # asphalt at different temperatures by using methods of DSR.The results showed that:during 28°C~34°C,with the rising of Temperature,performance of Resistance to fatigue cracking of the original modified asphalt and the original 90 # asphalt has became more and more strong.At the same temperature,the original modified asphalt’s performance of Resistance to fatigue cracking is stronger than the original 90 # asphalt’s.Long and short-term aging reactions weaken the performance of resistance to fatigue cracking of SBS modified asphalt and 90 # asphalt, and the effects of long-term weakening is more obvious.during 52°C~76°C,the anti-rutting performance of SBS modified asphalts and the 90 # original asphalts became more an more bad with the rising of Temperature.
Durability of Bond Interface between CFRP and High Strength Concrete under Wet-Dry Cycling and Sustained Loading
Authors: Wang Su Yan , Li Lu Xi , Zhang Suo Dong , Hong Lei
Published: December 2014

The bonded joints between CFRP and high strength concrete subjected to different wet-dry cycles and sustained loads were studied with double-lab shear tests. The results indicate that with the increase of cycles, the ultimate bond load rises at early stage, however decreases generally. Sustained loads significantly affect failure mode of specimens, and make the destruction more sudden.
Experimental Study on Carbonation Resistance of Waste Rubber Concrete
Authors: Yu Qun , Wang Jing
Published: December 2014

The experiment study on the effect on the waste rubber concrete carbonization resistance performance from using three different doses of rubber which is 5%, 10%, 15% and three different rubber particle size which is 2-4 mm, 30-40 mesh, 60-80 mesh .The conclusion is that the concrete adding rubber particles had an adverse effect on early carbonation resistance of concrete, but late can make concrete carbonation resistance ability raise; Different rubber particle size and different influence on concrete carbonation resistance ability, 10% rubber content effect is the best, and the smaller the particle size of rubber particle concrete carbonation resistance ability of the better the results.
Experimental Study on In Situ Inspection of Existing Steel Structure’s Steel Strength by Leeb Hardness
Authors: Sheng Qin Zhu , Li Cheng Cai , Sun Hui She , Yu Li Qiang
Published: December 2014

Experimental studies and regression analysis of experimental data show that when using HL hardness tester (under conditions of C-type/D-type impact device) to measure the tensile strength of steels from existing steel structures, the relation curves between Leeb hardness and tensile strength of steel can be achieved. It may provide a non-destructive (NDT) method for testing tensile strength of steel.
Influence of Polymer Latex on the Interlayer Bonding Performance of Cement Concrete
Authors: Yang Tai Xiu , Zhu Jing
Published: December 2014

Adding polymer into cement concrete is used to increase the interlayer bonding performance. The impact of polymer on the interlayer bonding performance was studied by shear strength and tensile strength test. The mix design of the interface agent was optimized through the tensile bending tests of different fiber and polymer dosage. The impact of casting methods and interface agent mix was studied through tests. The test results show that: adding organic fiber and polymer into cement concrete could significantly increase the interlayer bond strength. The interface agent of SBR (styrene-butadiene rubber) latex modified cement paste has better tensile bonding properties. When the ratio of cement to DB-1 latex is 3:2, it will effectively increase the interlayer bonding performance of cement concrete.
Numerical Simulation of CSG Concrete Compressive Strength(II)
Authors: Yang Ling Qiang , Wang Yan
Published: December 2014

Using numerical analysis to evaluate the mechanical properties of concrete is an important method emerged in recent years. However, some concepts and simulation methods need to be further investigated. This research used the test specimen for compressive strength of the concrete as the subject of numerical analysis; simulated the load to reach compressive strength and analyzed the stress field. Finally, yield strength of the concrete specimen is proposed.
Numerical Simulation of Internal Defects in CSG Concrete (I)
Authors: Yang Ling Qiang , Wang Yan
Published: December 2014

Numerical analysis was performed for compressive strength of the concrete. Internal defects of the concrete specimen were simulated and compressive strength reduction mechanism was studied because of angle..
Numerical Simulation of Internal Defects in CSG Concrete (II)
Authors: Wang Yan , Yang Ling Qiang , Gao Rui
Published: December 2014

Numerical analysis was performed for compressive strength of the concrete. Internal defects of the concrete specimen were simulated and compressive strength reduction mechanism was studied. The defects inside of the specimen are stochastic; therefore it is impossible to study the subject with physical material testing. From this study, it is shown that numerical analysis can effectively simulate internal defects and provide an efficient way to study compressive strength reduction.
Numerical Simulation of Internal Defects in CSG Concrete (III)
Authors: Ma Jing , Wang Yan , Yang Ling Qiang
Published: December 2014

Numerical analysis was performed for compressive strength of the concrete. Internal defects of the concrete specimen were simulated and compressive strength reduction mechanism was studied. The defects inside of the specimen are stochastic; therefore it is impossible to study the subject with physical material testing. From this study, it is shown that numerical analysis can effectively simulate internal defects and provide an efficient way to study compressive strength reduction.