bluuebunny/crossref_metadata_2025 huggingface dataset:
Distribution of Electromagnetic Field and Energy Flux in the Thin Film Solar Cell with Silver Nano-Disk Array
Authors: Zhou Hong , Huang Xiao Ping , Zhong Lei , Ji Sheng Kang , Pang Yan , Bi Sheng Jie , Liu You Liang , Chen Kai , Song Feng Zhen
Published: March 2013

We simulate and calculate numerically the electromagnetic field and energy flux in single crystal silicon thin film solar cell coated with silver nano-disk square array by using the finite-difference time-domain (FDTD) method. Because of the surface plasmon resonance (SPR) of silver nano array, the electromagnetic field is redistributed and enhanced in the solar cell. The simulation results show that the electromagnetic field distribution and corresponding energy flux component depend on the nano array and the structure of absorbed layer in solar cell. The wavelength of the incident light relative to the nano array determine the profile of the electric field around the nano array. The electromagnetic field distribution in thin film is determined by the internal structure of solar cell. For different incident wavelengths, the electromagnetic field distribution in solar cell will changes. The energy flux named as Poynting vector also changes with the incident wavelength. To investigate the absorption of the solar cell, the normalized absorbed power at different wavelengths is calculated. Based on the SPR effect, the solar cell exhibts absorption enhancement sharply at a certain wavelength.
Two-Photon Selective Reflection Spectroscopy of Confined Atomic Vapor at the Interface with a Ferroelectric Layer
Authors: Li Yuan Yuan , Li Li , Lu Yi Xin , Zhang Xiang Wu
Published: March 2013

We examine two-photon selective reflection (SR) spectroscopy in a system of -type three-level atoms at the interface with a ferroelectric layer on a dielectric surface. Two-photon SR lines, exhibiting Dicke-narrowing profiles due to atom-wall collision and Doppler free configuration, are periodically modulated by the thickness of the atomic vapor. These SR lines can be modified by the thickness and the complex refractive index of the ferroelectric layer, and can probably be a feasible method used in the measurement of the optical parameters of the ferroelectric layer.
Photonic Crystal Biosensor Using Surface Plasmon Resonance Effect
Authors: Su Wei , Zheng Gai Ge , Li Xiang Yin
Published: March 2013

We have proposed a biosensor using a one-dimensional (1D) photonic crystal with surface plasmon resonance (SPR) effect. The wavelength interrogation method has been used to study the performance of the sensor. Numerical simulations based on rigorous coupled wave analysis (RCWA) method show that the sensitivity of the optimized sensor is 137 nm/RIU (per refractive index unit).
Foaming of Polystyrene with Supercritical Carbon Dioxide
Authors: Ma Wei Hua , Ding Jie , Zhong Qin
Published: March 2013

General Purpose Polystyrene (GPPS) and High Impact Polystyrene (HIPS) were foamed with supercritical carbon dioxide in the batch foaming process. Foaming behaviors of GPPS and HIPS were investigated. The cell diameters and cell densities of GPPS and HIPS vary strangely with foaming conditions and can be explained by the classical nucleation. The competition between cell growth and cell nucleation is used to explain these strange foaming behaviors. The glass transition temperature (Tg) almost remains constant with the foaming temperature rising.
Design and Implementation Full Automatic Intelligent Control System Oriented to Vacuum Casting
Authors: Zhang H.G. , Hu Q.X. , Liu Y.Y. , Liu D.L. , Huang J. , Chi Z.F.
Published: March 2013

Based on craft features analysis of vacuum casting, this paper concluded that the automation level and control precision of control system are key influencing factors for products quality of vacuum casting. So the purpose of this paper is to resolve these disadvantages of existing control system of vacuum casting equipments. This paper designed a new full automatic intelligent control system which adopts two-level distributed structure. The system is consisted of motor control subsystem, vacuum monitoring and control subsystem, and bubbles detecting and eliminating subsystem. According to the function requirement of control system, this paper described selection and configuration of hardware and function implement of software in detail. Finally, this paper designed and realized a new automatic detecting and eliminating method of bubbles based on vision sensor technology, and presented an intelligent controller model based on Wavelet Neural Network (WNN) for motors. The experimental prototype of vacuum casting has been developed and a large number of experiments have been carrying on. These new controlling algorithms have being tested. The control system integrates vision sensor, intelligent control, microcomputer interface and imaging processing technologies, so it possess high precision, efficiency and flexibility and has a good market application prospect and high economic value. It will be breakthrough for precise rapid tooling.
Research on Self-Propelled High Spray Machine Steel Stamping Forming
Authors: Zhang R.H. , Miao H.
Published: March 2013

In this paper through simulation a single factor analysis and research four parameters of Self-propelled high Spray Machine steel stamping forming ,including die gap(), die radius(r), friction coefficient(f) and drawbead height(h), on the impact of sheet forming. Considering the defects of steel forming in the actual production, the most important parameters is determined and four parameters and three level orthogonal experiments are carried out. The drawbead height (h) is the most important parameter affecting in steel forming that should be strictly controlled in the actual production. The die gap () is secondary. The die radius (r) and the friction coefficient (f) affect the least. In order to improve the quality of stamping, the3r2f3h3 process combination should be adopted, which provided some theoretical guidance in actual production
Study on Object Function of Milling Insert Adhering Disrepair for Machining the Refractory Steel
Authors: Wu Ming Yang , Liu X.L. , Cheng Y.N.
Published: March 2013

Based on the milling experiments for the difficult-to-machine material 3Cr-1Mo-1/4V steel, as the goal of minimal adhering disrepair, taking the waved-edge milling insert (the rake face is curve plane) developed by Harbin University of Science and Technology as an example, we have study on the optimization object function of the milling insert grooves. Based on the heat density function of the 3D complex groove milling insert, setting the heat density function as boundary conditions, we have the finite element analysis (FEA) on the temperature fields of different cutting parameters, and have fuzzy synthetical judgement on the temperature fields with fuzzy mathematic theory. We build the object function relation between the fuzzy synthetical judgement results and cutting parameters of the adhering disrepair, so to have groove design optimization. So provide the theoretic and technical basis for solving the adhering disrepair problem and groove optimization.
The Innovation Scheme Research of Cutting Part with Shearer
Authors: Wu Wei Dong , Yan S.Y.
Published: March 2013

TRIZ is a comprehensive theoretical system composed of a variety of methods and algorithms to solve technical problems and achieve innovative development. In this paper, the definition of TRIZ theory, ideality and the problem-solving methods in TRIZ including physical contradictions and technical contradictions, 39 general engineering parameters and contradiction matrix were firstly explained, and then in order to solve the existing problems of high energy consumption and small power in cutting part with Shearer, the TRIZ theory and the Computer Aided Software Pro/Innovator were applied to design innovation scheme. The Ideality of the technical system was defined. From the expression, the contradictions were revealed in improving the degree of ideality. To make the technical problem further solved, it was analyzed and decomposed in the three directions of system, operation, cause and effect. According to the specific decomposed result, the parameters of improvement and subsequent deterioration from the view of ideality were analyzed and determined, and finally the innovation schemes of cutting part were put forward using the tool of contradiction matrix and innovative principles.
Research on Model Transformation Method Oriented to Model Driven ERP System
Authors: Che Ying , Wang G. , Lv M. , Ren B.Y.
Published: March 2013

The model transformation from Computation Independent Model (CIM) to Platform Independent Model (PIM) level is one of the crucial and difficult points in the implementation process of model-driven Enterprise Resource Planning (ERP) system. For achieving the semantic conforming transformation between these two abstract modeling levels in Model Driven Architecture (MDA), a model transformation method based on ontology technology was proposed, which was a semi-automatic and general method. Firstly, the existing problems of model transformation from CIM level to PIM level in current studies were analyzed. Then, a model transformation framework based on ontology was built, the basic concepts relating to ontology were defined, and the whole architecture was described. After that, the transformation method was researched from two parts, the discovering of mapping rules and the occurrence of model transformation, which included the discovering technology of mapping rules based on similarity and the working principles of model transformation generator. Finally, a model transformation example was provided for validating the practicability and feasibility of proposed theories.
The Research on Long-Term Financial Early-Warning System of Listed Companies
Authors: Mou Wei Ming , Gu Shui Bin
Published: March 2013

The article takes listed companies as research samples. Firstly, it selects 36 ST or *ST companies listed in Shanghai and Shenzhen Stock Exchange Market, who received special treatment during 2007 to 2009 for the first time and it also chooses another 36 normal companies as paired ones. Then, after using Factor analysis for identifying indexes, the paper go on with utilizing logistic to structure a financial long-term warning model. To verify the effectiveness of the model, the paper selects another 12 financial crisis companies and 12 financial fit companies to test. The results come out to show that establishing an effective long-term financial early-warning system helps enterprises to avoid financial crisis.
Assembly Sequence Planning Including Tool Check Based on Improved Ant-Colony Algorithm
Authors: Li R. , Chen H. , Xie L.
Published: March 2013

According to the characteristics and demands of assembly sequence planning (ASP) of complicated electromechanical products, the improved Ant-Colony algorithm is presented to solve the problem. In order to plan assembly sequence, Precedence Graph, which is created based on assembly model, is created to record precedence relations between components. Several mechanisms are designed to make the precedence relations correct and compendious. To examine the feasibility of the sequences for tool’s operation, a quick checking method is proposed based on Potential Interference Information, which is created by simulating the tool’s movement and checking the interference information in entire assembly. Then, the Ant Colony Algorithm is improved to generate optimal assembly sequences with the guidance of precedence relations. Two important influence factors have been taken into account in the method. (1) A Penalty-Evaporation mechanism is proposed for the algorithm to punish unfeasible solutions. (2) Via analyzing the effects of the parameters in the state transfer function, the better solution is obtained while change the fixed parameters to transforming with time. Finally, an example illustrates the effectiveness of the strategy.
Analysis of Bearing Capacity for Quicklime Compaction Pile Composite Foundation
Authors: He Yong Qiang , Liu Bin Can , Jiao Bao Ping , Gan Ji Zhong
Published: March 2013

In the collapsible loess of Midwest China, quicklime compaction pile composite foundation has been widely used in practical engineering. Firstly，the calculation method of quicklime compaction pile composite foundation is analyzed; then the influencing factors of bearing capacity for quicklime compaction pile composite foundation was researched on the basis of the character about soil compaction effect between piles with the quicklime expanding when absorbing water from the soil; lastly, the calculation method was used in practical engineering, the results can be used to reference in reliability design application of composite foundation.
Damage Detection of Continuous Box Girder Based on Modal Flexibility Curvature Method
Authors: Xu Xiang Feng , Zhang Feng , Zhu Wen Xin
Published: March 2013

The modal flexibility was more effective than structural frequency and displacement mode on damage detection of structures, it could be calculated easily based on low order mode of box girder. The damage detection method was proposed based on the modal flexibility curvature in this article, this indicator considered the impact of length difference of adjacent elements on modal flexibility matrix. Damage sensitivities of indicators is contrasted. Calculating results show that flexibility curvature difference has good detection effect on single point damage, multi-point damage and side element damage. The method in this article has good effect on damage detection of box girder.
Field Testing on Natural Frequencies of a Cable-Stayed Footbridge Based on Ambient Excitation
Authors: Liu Hao , Huang Yu Tian , Hu Jian , Wang Xin , Fan Wei
Published: March 2013

Many footbridges may suffer from the intensive vibration induced by human activities. To be a direct and effective approach, field measurement is widely utilized to assess the vibration serviceability of footbridge. The field measurement and modal identification of a cable-stayed footbridge is conducted in this study. The dynamic responses of the example footbridge subjected to ambient excitations are collected through field measurement and utilized to identify the structural dynamic properties by using two approaches. The made observation indicate that the peak acceleration responses at different testing points are different to great extent but the spectrum properties of all the points are quite similar. The fundamental frequency for the vertical vibration of the concerned footbridge is close to the lower frequency of the pedestrian loading and a relatively large vibration and discomfort of pedestrians can be observed
Full-Scale Fatigue Test of Trough-to-Deck Plate Joints in Steel Orthotropic Deck
Authors: Wang Xiu Wei , Tang Liang , Wang Chun Sheng , Liu Gao
Published: March 2013

Trough-to-deck plate joints in steel orthotropic deck are very sensitive to fatigue. A full-scale fatigue test of steel orthotropic deck was conducted to study the fatigue performance of trough-to-deck plate joints between two diaphragms. The test panel has three spans of 1.0m+3.5m+1.0m in the longitudinal direction and five troughs with the width of 3.0m in the transverse direction. At the end of the fatigue test, the cycles of the fatigue load reached to six million and no fatigue cracks were found by naked eye at the trough-to-deck plate joints. Based on the failure criteria of the measured stresses with a sudden change, it is confirmed that the fatigue strength of trough-to-deck plate welded joints with deck plate failure is similar to design category 71 in the Eurocode using the measured stresses at a distance of ten millimeters from the weld toe.
Space Analysis of Long-Span Continuous Rigid Frame Bridges
Authors: Hao Xian Wu , Yang Ya Xun
Published: March 2013

With the background of continuous rigid frame bridge,this paper considers the impact of the structural weight and the pre-stressed force in the construction phase,uses the ANSYS finite element analysis program to analyze the stress and strain of an continuous rigid frame bridge in the the largest cantilever state, focuses on different effects of the different radius of curvature and pier height.Through the analysis constructs the control mentality and the corresponding design proposal for the continuous rigid frame bridge had been provided.
The Damage Analysis of Usu Bridge under Static Load
Authors: Sun Wei Gang , Gao Jian Hui , Zhang Li
Published: March 2013

The Usu Bridge is single cable plane single tower cable-stayed bridge, the finite element program is used in this paper, the tensile、compression damage model of Concrete Materials is adopted, the damage of concrete structures of Usu main bridge under the combination of four kinds of static load is calculated, we get the damage distribution of the main tower and the main beam、the location of maximum damage and the effect of loading conditions, from which we find that the change of temperature has a greater impact on their damage and the role of the extreme wind has a greater impact on the main tower, thus we propose reasonable proposals on the construction and maintenance of the bridge.
Numerical Simulation of Integral Mechanical Behavior for Dual-Wall Steel Cofferdam during Construction Process
Authors: Lu Wen Ru , Di Jin , Zhao Min , Qin Feng Jiang , Dai Jie
Published: March 2013

Based on a dual-wall steel cofferdam, the configuration character and construction technology of the dual-wall steel cofferdam was introduced. The load of different construction stages of the steel cofferdam was studied. The mechanical properties of this structure under every construction stage were analyzed by the finite element method. Analytical result reveals that the maximal Von Mises stress of the dual-wall steel cofferdam was 197.73 MPa under the action of the most disadvantaged load combination. That met the strength requirements of the temporary structure.
Elastoplastic Analysis on Circular Tunnels Surrounding Rock under Asymmetry Load
Authors: Zhou Yu , Lu Ai Zhong , Kuang Lin
Published: March 2013

The analytic solution for circular tunnel under asymmetry load usually uses C-M criterion, and the finite element calculation usually uses D-P criterion. In this paper, the complex variable function method is employed to do an elastoplastic analysis based on Tresca Criterion, obtained the stress and plastic radius in elastoplastic region. The result shows that extent of stress in elastic region is no longer match the Krisch solution. The solution is in good agreement with Sun GZ’s solution and finite element simulation based on ANSYS, which can be used in simple elastoplastic analysis of surrounding rock instead of finite element method.
Study on Anti-Cracking of Mortar and Concrete Pavement in Dry Areas of North China
Authors: Cao Wan Zhi , Wang Hong Zhen , Yang Yong Heng
Published: March 2013

It always is a technical problem about the drying shrinkage cracking of mortar plastering layer and concrete surface layer of building wall in construction field. The influencing factors of cracking have regional climate characteristics, building structures, raw materials, construction standards etc. Analyzed the cracking principle of mortar and concrete pavement in dry areas of North China, and developed the complex additives having five kinds of performances: efficient water conservation, compensated shrinkage, fiber reinforcement, self-repair cracks in the matrix and polymers toughening, which is used to mortar and concrete to alleviate drying shrinkage cracking. The series of processes and product performances of the complex additives has been introduced in this paper.
Soil Nailing Optimization Design Based on Improved Response Surface
Authors: Wang Qiu , Song Zhi Gang , Xu Qing
Published: March 2013

Gradient algorithm is difficult to obtain explicit analytic function of the optimization model, at the same time heuristic algorithm is computationally intensive with low speed and less efficient in soil nailing optimization. To overcome these problems, a new optimization method based on improved response surface (IRS) which constructed by uniform design (UD) and non-parametric regression (NR), is proposed. The soil nailing optimization is adopted by the combination of explicit analytic model based on IRS and composing program. The optimization process is explained and a soil nailing is optimized to verify the feasibility of the proposed method. The optimum results show that the introduction of UD and NR to construct the IRS calculate fast, do not need solving the specific analytic solution and can obtain global optimal solution.
Test Analysis of Vibration Characteristics on CRTS II Slab Ballastless Track Subgrade of the Beijing-Tianjin Intercity High-Speed Railway
Authors: Chen Hu , Lin Kun , Fan Sheng Bo , Chen Jian
Published: March 2013

Dynamic response tests were developed on CRTS Ⅱslab ballastless track subgrade of Beijing-Tianjin intercity high-speed railway.The relationship between vibration response and the speed, the vertical and horizontal distribution law of vibration response along lines, the effect of axle load on vibration response were researched.Test results are as follows: The vibration displacement of the extreme value caused by a single axle load is not obvious;Train axle load significantly affects the vibration response;Despite the vertical connection between two track slab, but the end of track slab vibration response is still significantly greater than the middle and the vertical multi-storey line structure vibration response decreases rapidly along the depth;Speed has no significant effect on the vibration displacement, but vibration acceleration and vibration velocity is sensitive to speed.
Research Status on Seismic Performance of Steel-Concrete Composite Coupling Beam
Authors: Shi Qing Xuan , Tian Jian Bo , Li Kun , Guo Zhi Feng
Published: March 2013

Coupling beams of coupled shear wall system in seismic regions are required to have high load resisting capacity and excellent ductility and energy-dissipation capacity. To achieve this goal, the concept of steel-concrete composite coupling beam is proposed. The steel-concrete composite coupling beam is a new form and worthwhile to research and promote. Further, it is a new direction for the future development of the coupling beam. But there is a lack of specific calculation method and constructional measures in the current related codes. In this paper, the review of available literatures is made including the experimental study and influence factors of mechanical behavior. It works that have not yet been covered after summarizing each research methods and research contents, which will provide scientific reference material for the intensive research on steel-concrete composite coupling beam.
Analysis on Seismic Energy Response of Reinforced Concrete Frame-Core Wall
Authors: Li Kun , Shi Qing Xuan , Guo Zhi Feng
Published: March 2013

Elastio-plastic dynamic analyses of 5 reinforced concrete frame-core wall structures with different structural characteristics were carried out under several sets of ground motions. The earthquake total input energy of the structure under ground motion, and the regularity of the total input energy between hysteretic energy and damping energy were discussed; the distribution of hysteretic energy among shear wall, coupling beams and frames were studied, as well as the distribution of hysteretic energy along different stories. The results show that the hysteretic energy is increased with the peak ground acceleration. The earthquake records with different spectrum characteristics have a great influence on hysteretic energy. Although the total hysteretic energy among different structural members are steady, the distribution of hysteretic energy among shear wall, coupling beams and frames may vary significantly. It is found that the bottom portion of shear walls and coupling beams in middle floors are the predominant energy dissipated area.
Investigation on Seismic Structural Damages in Anchang County in Wenchuan Earthquake
Authors: Li Wei , Li Shan You , Zhao Zhen
Published: March 2013

The seismic damage investigation on 488 buildings in Anchang County during Wenchuan earthquake was performed and the investigation data were analyzed, especially for the school buildings. The results indicate that the seismic damages of buildings with seismic design are obviously lower than those of buildings without seismic design, and the damages of the Type-A buildings are most severe, those of the Type-B buildings are second while those of the Type-C buildings are the slightest. Moreover, the damages of Type-B and Type-C school buildings are a little higher than the average level of Type-B and C buildings in Anchang County.
Study on Slope Stability & Stress-Deformation of Foundation Pit Based on FEA
Authors: Guo Fang , Tang Jie Jun , Gu Wei , Yuan Fang
Published: March 2013

In order to study the slope stress-deformation characters and stability of foundation pit after excavation, analyzed the examples based on the FEM theory, the results show :both the horizontal displacement of slope edge and settlement of slope top are small after support, and they are within the standard, deformation is not the reason for fissure: safety factor of slope is smaller than 1 after excavation, while the safety factor reaches require after support.
Seismic Risk Evaluation of Retrofitted Reinforced Concrete Buildings Utilizing Base Isolation and Considering Mainshock-Aftershock
Authors: Han Rui Long , Li Yue
Published: March 2013

The insufficient consideration of seismic risk caused hidden danger for structural safety in many areas. A promising retrofit method for these structures is base isolation. In order to evaluate the effectiveness of this approach, a hypothetical RC frame based on actual situation is designed to be retrofitted using base isolation. Then, seismic fragilities for both un-retrofitted and isolated frames are analyzed, utilizing the results obtained from nonlinear finite-element analysis. The ground motion of the analysis contains 22 earthquake motions, and the results of considering mainshock-aftershock and those of considering only mainshock are compared. The study proves the well designed base isolation can reduce the seismic fragility of the RC frame effectively, and the exclusive consideration of mainshock will underestimate the seismic hazards for structures.
A Comparative Study of Artificial Boundary Conditions in ABAQUS
Authors: Wang Yan Wei , Li Shan You , Ma Qiang , Li Wei
Published: March 2013

Viscous boundary, viscous spring boundary, infinite boundary have been widely used during the last decades to solve the wave propagation in the infinite ground. In this paper we evaluate the performance of the three boundary conditions focusing on their solution precision. The comparison is performed on a two dimensional finite element model built by ABAQUS. The results show that viscous spring boundary outperforms the other boundary conditions, and viscous boundary is better than infinite element.
Analysis on Response of Destructive Piles with and without Post-Grouting Craftwork
Authors: Ma Jie
Published: March 2013

Two full-scale destructive load tests were conducted on test piles to capture the response of post-grouted and non-post grouted piles. The results show that the relationship between end resistance and displacement developed at the pile base follows a linear model for the piles without and with post-grouting craftwork. It is observed that the limiting total skin friction of pile after post-grouting craftwork is 1.067 times that of non-post grouted pile, whereas the ultimate tip resistance of post-grouted pile is about 1.113 times that of the pile without post-grouting craftwork. At the ultimate loading level, the pile compression has been found to be 45.7% to 50.3% of the pile head settlement. For the long post-grouted pile, the pile shaft compression should be taken into account and enhancement of the shaft strength can reduce the pile head settlement.
Seismic Evaluation of Retrofitted Factory with Rubber Bearing and Design Method
Authors: He Bin , Pang Jin Lai , Liu Cheng Qing
Published: March 2013

For particular change of function, factories are sometimes to be retrofitted into specific buildings with insertion of additional floors. Conventionally, there are two methods in retrofit of factories when additional floor is needed. One is the reconstruction of a secondary structure inside the existing building, while the other is the so called direct construction of additional floor. The latter is preferred on particular occasions due to the simplification of procedure. However, strengthening is still required in this case for the loads induced by extra floor may impose an adverse effect on existing strucutre. In this study, the rubber isolation is introduced into retrofit of factories. Based on case study, its effect in isolating earthquake is evaluated, and relative discussion is also made with energy balance concept. The design procedure of retrofit design of factories with additional floors is discussed in this study, which may provide instruction in applying this technology into engineering practice.
Study on Finite Element Method for Simulating Seismic Behavior of New All-Bolted Semi-Rigid Connection
Authors: Zhao Xin , Wu Mai , Chen Xiang Shang , Wei Guang
Published: March 2013

Using the APDL language of ANSYS which is the large general-purpose finite element software, the finite element (FE) model of new bolted beam-to-column connection for concrete-filled square steel tube (CFST) is established. The simulated analysis for the seismic behavior of the new semi-rigid connection under low-cycle reverse loading is carried out by the FE method. It is focus on the method study on establishing geometry model, selection of element and its parameter, setting up boundary restraint and solution during FE analysis. Through comparision it is found that the calculated values and the experimental results are very close, which verifies the correctness and rationality of the method in this paper. The research work provides fundamental basis for future intensive study on seismic behavior of the new connection.
The Seismic Performance of High-Rise Structure with Different Conversion Layer Position
Authors: Zhai Kang Lan , Lei Jin Song , Li Si Xue
Published: March 2013

In order to study the conversion layer position to the effects on seismic characteristics of high-rise structure, this paper made the frame supported structure of high-rise building model using finite element software Etabs. Through four different height conversion layers of analysis model, it studies the setting height to the influence of the dynamic characteristics on the structure system. The results shows that the conversion layer position will all produce unfavorable effects on seismic performance for the whole structure, no matter that too low or too high.
The Degradation of Saturated Clay’s Un-Drained Shearing Deformation Modulus under Cyclic Loading
Authors: Hu Wei , Xu Jia Jia , Zhang Ying
Published: March 2013

The un-drained shearing deformation modulus of clay will degenerate under cyclic loading. This degeneration is attributed to two reasons, the first one is the reduction of effective pressure due to the increment of super pore pressure; another one is the change of soil’s structure due to the accumulation of plastic shearing strain. Firstly, based on the result of un-drained shearing tests, two formulations were obtained which include initial deformation modulus ratio versus over-consolidated ratio and initial deformation modulus ratio versus initial shearing strain. Then, the quasi-over-consolidated ratio was introduced to consider the effect of super pore pressure, and a fitting formulation was applied to consider the influence of shearing strain. At last, the degenerate formulation of saturated clay’s deformation modulus was deduced, which was proved reasonably by the test results.
Vibration Table Test and Research on Seismic Performance of Reinforced Concrete Eccentric Frame - Shear Wall Structures
Authors: Li Bing , Jiang He Ping , Wang Wei Hao
Published: March 2013

Reinforced concrete eccentric frame - shear wall structures has been widely used in Engineering, but this structure is mostly used for high-rise structure. Depending on experimental study will be unable to accurately draw the seismic reflection of structure, it needs to use the simulation software to study the seismic performance of high-rise structure. In this paper, by using ANSYS finite element analysis software to establish the numerical model which is based on the test model to carry out the seismic performance simulation. Then, through the improvement measures to get the measures for improved seismic performance.
On the Application of Anti-Seismic & Waste-Recyclable Foamed Concrete Cast-in-Place Wall in Architecture
Authors: Hu Hui Fen
Published: March 2013

Characterized by the strengths of earthquake proof and waste utilizing, the foamed concrete cast-in-place wall, one of the newest building materials, have been widely used in the architectures within the earthquake-prone areas. This paper conducts research into the problems of the foamed concrete cast-in-place wall during its application such as defective industry standards, low intensity, poor producing condition, etc. Then it analyzes countermeasures that could be taken to promote the development of the foamed concrete cast-in-place wall including completing relevant systems, improving intensity by altering additives, perfecting production process and improving production equipments, etc.
Stability Analysis of Stiffened Plates Based on State-Vector Equation
Authors: Wang Yan Li , Qing Guang Hui
Published: March 2013

Firstly, based on the theory of state-vector equation, the semi-analysis finite element formulation for the stability of the plates under various boundary conditions was derived by modified Hellinger-Reissner (H-R) variation principle for the elastic material. Secondly, the three-dimensional models for the stability of stiffened plates were established. The semi-analytical solution of state equation for the stability of stiffened plates are proved to be efficient and accurate by comparing with the exact solutions of references and the numerical solutions of the finite element software through several examples.
A Flow-Condition-Based Interpolation Method Combined with Splitting Algorithm for Wind Field Calculation
Authors: Su Bo , Han Xiang Ke
Published: March 2013

Wind field calculation is a research focus for wind disaster prevention in Civil Engineering. A new finite element procedure using flow-condition-based interpolation method combined with splitting algorithm is proposed in the paper. It used the analytical solution of one-dimensional advection–diffusion equation, and naturally introduced upwind effect in element interpolation functions. Further, combined with splitting algorithm, the element interpolation functions of velocity and pressure have concise format without meet Babuska-Brezzi condition. A two dimension four-node bilateral fluid element was constructed using flow-condition-based interpolation method and a corresponding program was developed. The solution procedure was discussed in detail and the numerical example solution was given to illustrate the capabilities of the procedure
Lateral Buckling Analysis for Rectangular Cantilever Plate Subjected to a Concentrated Loads
Authors: Jiang Li Qiang , Wu Song Jin , Zheng Hong
Published: March 2013

In order to get the lateral buckling performance of rectangular cantilever plate under concentrated load.200 buckling mode of 30 plates is competed by ANSYS finite element software. All kinds of buckling load and span-height ratio curves is built up with different thickness of plate. Comparison analytical solution and ANSYS solution, the length-width ratio range is concluded applicable for that formula. Then the formula is modified to make its calculated results better tally with the ones of ANSYS analyses and make precise the calculation of the critical load of lateral buckling of the plate. The solution set up foundation for rectangular cantilever plate component design and stability analysis.
Material Factor for GFRP RC Structures in Canada
Authors: Huang Jian Wei
Published: March 2013

Degradation mechanisms of GFRP bar in real concrete are still not clear to civil engineers due to limited field applications. To avoid unsafe design, in current design codes a material factor is used to assure long-term safety of GFRP RC structures. This paper presents an assessment of material factors for GFRP bar as specified in Canadian Design Codes by predicting GFRP long-term performance with monthly average temperatures from 14 weather reporting stations in Canada. Results showed that the material factor varies from 0.57 to 0.61 for an application with 100% RH exposure, while a factor of 0.75 could be adequate for cases with exposure RH ≤90%. Considering the annual relative humidity across Canada, conclusion could be made that current factors in Canadian codes could provide sufficient safety margin.
Effect of High Frequency Vibration on Pore Parameters and Frost Resistance of Air Entrained Concrete
Authors: Zhang Yan Cong , Gao Ling Ling
Published: March 2013

High frequency vibration was brought to two different air-entrained concrete. Pore structure analyzer of hardened concrete quantitatively described the influence of vibration to air content, air spacing coefficient and bubble size distribution. Meanwhile, the relationship between high frequency vibration and the ability of frost resistance was accurately determined through the testing freeze-thaw cycle. The results showed that: long time high frequency vibration would cause decline of frost resistance.
Test and Research on Mechanical Property of Ceramsite Steel Fiber Concrete
Authors: Dong Sen Lei , Xu Xin Sheng , Zhang Bo
Published: March 2013

Destructive process of ceramsite concrete is nominally that at the earliest stage, microcracks appear in ceramsite aggregate and spreading to boundary surface. Once they develop to mortar, if no other factors to restrain crack propagation, ceramsite concrete will be destroyed quickly. After including of steel fiber, toughness of ceramsite concrete will be greatly increased. In the treatise, influences on different amount included of steel fiber in above CL40 ceramsite concrete on compression, pulling, bending strength and bending resistant toughness and compression toughness are tested and researched.
Restrain Effect of Expansive Admixture in Concrete Members
Authors: Xue Xin , Chen Zhi Wei , Seki Hiroshi
Published: March 2013

This paper evaluated the restrain effect to cracks in the concrete members containing expansive admixture addition. An experimental study modeling the slab of the field bridge is performed. The free strain, the actual strain of specimens with or without expansive admixture and steel bars is measured. Based on the experimental results, the internal restrain effect and steel restrain effect to cracks are calculated as approximately 0.35 and 0.2~0.3 respectively.
Nonlinear Fatigue Life Modeling of FRP Composite Materials Based on Genetic Algorithm
Authors: Xue Xiao Min , Sun Qing , Wu Xiao Hong , Wang Hu Chang , Zhao Xue Lin , Zhu Kun
Published: March 2013

In this paper, three fatigue models are employed and proposed for modeling the fatigue life of different fiber-reinforced composite material systems. In order to identify the unknown parameters in these models, Genetic Algorithm (GA) is used for estimating its values. This technique is a stochastic process that leads straight to different S-N curves that predicts the trend of the experimental data without the need for any assumptions. The calculation results show that these three models, especially the nonlinear regression model, whose parameters are assigned by using GA are all satisfied with the experimental data, and the average value of RMSE is below 0.1. The method of fatigue damage simulation presented should have a very good application prospect.
Slope Effect of Phase Change Materials in Phase Change Roof
Authors: Lu Li Bing , Wang Jing , Gao Meng , Li Dong
Published: March 2013

Under summer climatic features of Daqing area in China, numerical simulation on the unsteady heat transfer characteristic of phase change roof was investigated, considering direct influence of solar radiation. The main influencing factor of roof slope in the phase change roof was analyzed in this paper. The results show that, increasing the roof slope is beneficial to promote the effect of heat-insulating and temperature-reducing of phase change roof, whereas the extent of the ascension is weak. Different slopes in roof structure have basically no influence on the delay effect.
Back-Analysis for Design Parameters of Large Diameter Bored Piles
Authors: Raongjant Werasak , Jing Meng
Published: March 2013

Field test data from three instrumented large diameter bored piles in Pattaya city of Thailand were analyzed to study the behavior of load transfer mechanism from the pile to soil. The pile load test data were obtained from conventional static load test. These bored piles used for conventional static load test have the same diameter of 0.80 m and different length in the range of 25 m to 32 m. Results from back-analysis found that the skin friction resistance, β, has the value between 0.20 and 0.64 and the bearing capacity at end of piles, Nq, which is in the range of 10 to150, is much lower than the theoretical values proposed by other researchers before.
Introduction on a Kind of Environmental Biological Materials - Dextrins
Authors: Zhao Yan , Tu Yong Gang
Published: March 2013

Dextrins are important starch derivatives, they are a kind of environmental biological materials and widely used in industry. The paper gave a full introduction about the definition, properties, application and the recent research situation of pyrolysis dextrin, cyclodextrin, maltodextrin and β-limit dextrin, their development tendency are also discussed.
Application of Georadar in Detecting Karst Cave underneath Independent Foundation
Authors: Li Xia , Li Fei Fei , Jiang An Nan
Published: March 2013

Georadar has many advantages, including good accuracy, high detecting capabilities, and user friendly results (data collected is shown pictorially thus easy to read). In addition, it has capabilities to provide real time information in field. In the present paper, the authors investigated the application of georadar in non-destructive inspection of Karst Cave underneath independent foundation. The results obtained improve our understanding of geometry and provide a foundation for effectively control the design and construction processes.
Construction Technique of Dynamic Consolidation on Saturated Silt
Authors: Niu Yan Lei , Cao Yong Xian , Liu Yan
Published: March 2013

Based on the problems of the saturated silt foundation, the failure reasons of dynamic consolidation on saturated soft foundation in the past will be analysized. Combining with some successful experiences of dynamic consolidation, authors present some notices of dynamic consolidation on saturated soft foundation.
Temperature Sensitivity Analysis of Temperature Control Parameters for Massive Concrete Mixing with Slag Powder and Fly Ash
Authors: Tan Yao , Wang Feng , Deng De Qiang , Wang Chang Jie
Published: March 2013

In order to make the temperature controlling measure of massive concrete mixing with slag powder and fly ash effectively. Taking Guangzhou East Bridge sand cap-based temperature control project for example，the pile caps transient temperature field calculation model is established by finite element method. The different water cooling time and hydration rate are analyzed. The results show that the cooling time extending has less effect on central maximum temperature of double-doped concrete in early stage, but the times arriving corresponding stable temperature is earlier. The hydration rate has more effect on maximum temperature.
Study and Application of 60cm (Thickness) Roller Compacted Concrete Technology
Authors: Zhou Hong Wen , Li Hui Qiang
Published: March 2013

A new vertical vibration roller is applied in Huanghuazhai arch dam for 60cm RCC with 2+10+2 rolling times. According to the detection results of thick concrete, the compactness meets the design and code requirements. Thick RCC technology can accelerate concrete construction progress, cut down project time and economize investment, with higher popularization and application value.
IT Supported Construction Management: A Comprehensive Review and Ongoing Research
Authors: Yang Jun
Published: March 2013

Information technology has been applied in construction management and is gaining in popularity in recent years. This paper explored the state-of-the-art research and made a comprehensive literature review from two aspects: ‘IT supported construction process surveillance’ and ‘IT supported built infrastructure evaluation’. Multiple sensor technologies (including GPS, RFID, UWB, video camera and laser scanner) and their applications in construction management were introduced separately. Then some of the author’s ongoing research was introduced briefly with two future perspectives envisaged. In the near future IT supported construction management is expected to become a rapidly increasing area and has far-reaching impact in industry.
Expert System Apt to Automatical Matching and Forming for Connecting Joint of Steel Structure
Authors: Li Li Hua
Published: March 2013

More characteristic parameters are put forward for connecting joint of steel structure and the classifying method applicable to computer software is summarized through analyzing the character of all kinds of connecting joint of steel structure. The feature system which could reason automatically and give relevant conclusion is realized by regular expert system technology.
Dynamic Response Analysis of Compaction Loess Subgrade
Authors: Zhang Guo Xin , Yuan Zhong Xia , Wang Nai , Zhang Ze Zhong , Gao Peng
Published: March 2013

The problems of compacted loess roadbed utilization are closely related to the characteristics of compacted loess and long-term vehicle loads. According to the characteristics of compacted loess in different degree of compaction, the distribution and deformation change rules of the dynamic stress under dynamic load are studied through the finite element program numerical analysis of vehicle loads roadbed dynamic response. The data is acquired by field test and laboratory experiment. In lighting of the influence of the subgrade deformation by degree of compaction and pavement structures, the influence models are given which are used for estimating the roadbed vertical displacement in different conditions.
Development of Civil Engineering Structural Damage Diagnosis
Authors: Huang De Yu
Published: March 2013

Damage diagnosis of civil engineering structures has become one of the hot spots of the current international research in the field of Civil Engineering.This article describes the tasks and objectives of structural damage detection in civil engineering,systematically expounded the civil engineering structural damage diagnosis describes the traditional methods of structural damage diagnosis, static methods and dynamic methods, and evaluated their respective advantages and disadvantages.Finally, the study made several suggestions and Prospects for structural damage detection.