bluuebunny/crossref_metadata_2025 huggingface dataset:
Inelastic Dynamic Analysis of Steel Structure Using Force Analogy Method
Authors: Song Shi Qiang , Li Gang
Published: June 2012

Force analogy method is a kind of nonlinear dynamic analysis method. Analyzing inelastic structural behavior by using plastic hinge theory, it is widely appropriate to many structures with different material properties and very time efficient and numerically accurate without complicated iterative computations in traditional algorithm. Compared with the traditional finite-element analysis method, dynamic response analysis based on force analogy method has obvious advantages. The application of force analogy method to a steel structure is presented and the analysis result shows that the method algorithm can represent each response state of the structure in real-time and has the very good accuracy and practical.
The Analysis of Pecan Picking Mechanism Based on the Vibration
Authors: Li Xiao Liang , Yao Wen Bin
Published: June 2012

Pecans are unique in our country. They not only have rich nutritive value, but also have great economic value in fertilizer, feed and activated carbon so on. But because of the complex terrain, it brought much inconvenience for pecan picking. This article tested samples of HengLu town of LinAn city and analysis pecan dynamic characteristics. Then find a kind of pecan dynamic model based on vibration and provide the theory basis for vibration type pecan picking machinery.
Analysis of Sliding Cable Element
Authors: Fu Xiang Rong , Luo Cheng , Ju Jin San , Jiang Xiu Gen , Tian Ge
Published: June 2012

The sliding cable structures have found its application in many practical structures, such as ski lifts, electrical transmission lines, and cable systems in the erection procedures of long-span bridges. This paper presents a method for modeling the cable sliding on a pulley or sheaves. “Sliding cable element” is developed to solve the general problem. Based on the foundational principles of finite element analysis, the relation of the forces in the element on equilibrium state is used. The computation is simplified by automatically adjusting the cable length on each side of a pulley or sheave in order to maintain equilibrium. The element models are implemented in a geometrically nonlinear, transient implicit finite element program. Several numerical examples are developed to validate the effective of the sliding cable element.
The Water Depth Effect on Ship Pressure Distribution and Surface Wave
Authors: Miao Tao , Zhang Zhi Hong , Wang Chong , Liu Ju Bin , Gu Jian Nong
Published: June 2012

Applying linear marine hydrodynamics theory, the Kelvin wave source Green function of steady motion in finite depth was decomposed to three parts: array of simple Rankine sources, local distribution and wave part. Both at subcritical and supercritical speed, the singularity of integral function were eliminated by different integral path. The Kelvin source was distributed on the surface of ship by panel method, and the ship pressure distribution and wave pattern of ship in finite depth were calculated. The difference and connection between finite and infinite depth results were compared. It can provide the theoretical arithmetic base of improving the ship seaworthiness, increasing the speed and optimization of ship in river and offshore strip.
New Exact Solutions to Variable Coefficient KP Equation
Authors: Yin Jun Yi
Published: June 2012

Two kinds of new exact solutions were offered after studying the variable coefficient KP equation, of which, the group invariant solutions of KP equation was obtained by using Lie group method, while the solitonic solution of KP equation was obtained by using hyperbola function method.
A Modified Spectral Conjugate Gradient Methods with the New Line Search Condition
Authors: Ma Ming Juan , Su Yun , Hua Hong Tu , Zhang Yu
Published: June 2012

In this Paper, Combining the Nonmonotone and Monotone Line Search ,a Spectral Conjugate Gradient Methods Are Used in this Paper. by the Concept of Spectral, we Construct a Class of Spectral Conjugate Gradient with Different form . we Also Give the Algorithm for Conjugate Gradient Method. the Numerical Result Show the Efficiency of the Method.
The Study on J-Integral of Composite Laminated Plate Crack Propagation Problem
Authors: Zhao Dong , Zhao Yang , Fu Xiang Rong , Wang Wen Jie
Published: June 2012

The micro-cracks would occurr with the deformation in the composite materials. It would be expanded to the macro-crack in bonding surface and eventually leads to the overall damage of the structure. The initial defects will be inevitably involved in the production of the laminated composite structures. They also lead to delamination crack propagation and structural damage. This paper focuses on the application of the J-integral in the delamination of the composite laminated structure. The J-integral formula of the planar delamination problem of composite laminated structure was derived and verified in the numerical examples.
Mechanical Property Analysis on Joints of Steel Secondary Beam Inserted in Reinforced Concrete Frame Girder
Authors: Yu Qiong , Xu Jian Li , Zhao Xing Zhuang
Published: June 2012

Models for internal force analysis and strain distribution of joints of steel secondary beam inserted in reinforced concrete frame girder were analyzed. The horizontal internal force and vertical force were considered separately during calculation and analysis process. Bending-shearing correlation of vertical internal force was studied while the horizontal force wasn’t taken into account. Results show that the non-dimensional moment varies linearly with the non-dimensional shear force. Base on this, the formulas by which the joint moment and shear force are calculated are derived, and are related to depth ratio of forward to backward compression zone .And then the method to calculate joint moment capacity under horizontal force is put forward. By investigating the moment and shear force variation, the relationship between the yielding stress of the bar in the slab and the boundary concrete under the steel secondary beam crushing is identified. In the end, practical design method is proposed, and problems need further research are mentioned.
Study on Moment-Curvature Hysteresis Relationship of Reinforced Concrete Shear Walls
Authors: Zhou Guang Qiang , Xia Feng Min
Published: June 2012

In order to study and improve moment-curvature hysteresis model of reinforced concrete shear walls, experiment of reinforced concrete shear walls was conducted. Based on experiment of reinforced concrete shear walls, moment-curvature relationship is deduced and moment-curvature hysteresis curves are obtained. The existing moment-curvature hysteresis models of reinforced concrete walls are discussed and improved, and the calculated moment-curvature hysteresis curves with the modified model fit well with experimental results.
The Mechanical Response Analysis of the Frame Structure with the Interval Parameters Taken into Account
Authors: Meng Fan Bo , Qu Shu Ying , Shi Wen Pu , Li Cui Ling
Published: June 2012

In this paper, we checked the mechanical response of a simple frame structure with and without the existence of interval parameters taken into account. Discovered the differences between the traditional analysis methods of the structure and the analysis methods with the range of parameters taken into account. Gave their own ideas about the mechanical response of the frame structure considering the uncertainties, and provides a reference method for the accurate calculation of the actual structure considering the range of parameters.
An Influence Analysis of Second-Order Effect to the Vibration Control of Piezoelectric Beam by the Spline Finite Point Method
Authors: Li Shuang Bei , Jiang Lin Jie , Gu Chun Xia , Qin Rong
Published: June 2012

The field functions of the spline finite point (SFP) method were constructed by the linear combination of B-spline basis function, and the higher-precision results would be obtained with less discrete nodes by the SFP method. In this paper, based on Reddy's third order beam theory, a motion equation was developed by the SFP method to analyze the first five natural frequencies of piezoelectric laminated beam under different axial forces. The influence of second-order effect caused by the axial force on vibration control was discussed based on the modal control theory and the Linear Quadratic Regulator (LQR) optimal control method. It can be concluded that the SFP method is suitable for the dynamic analysis of piezoelectric beam which needs less computational cost and has high accuracy. The vibration of the structure can be effectively inhibited by the LQR method and modal control theory. And the axial force has significant impact on the natural frequencies and control voltage of piezoelectric beam.
Mechanical Behavior of Concrete-Filled Double Steel Tubular Columns under Axial Compression Load
Authors: Wang Xin
Published: June 2012

This article analyzes five concrete-filled double steel tubular column models based on the large finite element analysis software ABAQUS. An axial compression test was carried out on specimens with different diameter-thickness ratio of internal steel tube in order to get the whole longitudinal load-displacement curves and the whole load- strain curves for internal and external steel tube and concrete. We get the ultimate bearing capacity for five specimens, the result of simulation agree well with the theoretical calculation data, that provide reliable data for concrete-filled double steel tubular column in respect of finite element (FE) simulation.
Comparison Theorems for the Multi-Dimensional Backward Doubly Stochastic Differential Equations
Authors: Han Bao Yan
Published: June 2012

A class of backward doubly stochastic differential equations are studied. We obtain a comparison theorem of these multi-dimensional backward doubly stochastic differential equations.
Damage Identification in Composite Plate Using an Inverse Optimization Procedure
Authors: Sun Guo , Cai Xian Hui , Zhong Wei Qiu
Published: June 2012

In this paper, an integrated approach is presented to localize and assess the severity of damage in composite plate. Modal analysis was performed to obtain the mode shapes from both experimental and finite element analysis results. The mode shapes were then used to calculate an improved damage indicator function to localize damaged area. The presented method takes the change rates according to certain diagonal elements of the damaged structure flexibility matrix as identification indicator. The localization property of the indicator with respect to the damage factors makes it easy to identify the damage of multi-span beam and plate structures. An inverse optimization procedure is employed to minimize a no-linear error function between the analytical and measured modal parameters. The main problem is the multiplicity of parameter estimation solutions arising from using spatially sparse and noised-polluted data. A variable-weight optimization is used based on the alterability of the error function composition. Some examples have been utilized to numerically demonstrate the effectiveness of the present identification approach.
A Nonstandard Finite Difference Scheme for the Reaction Diffusion Equation
Authors: Liu Ming Ding
Published: June 2012

We use the nonstandard finite difference (NSFD) method to construct discrete models of the reaction diffusion equation. A nonstandard finite difference scheme for the reaction-diffusion equation is given. We demonstrated that the space denominator function can be based on the use of a transformation from the simple expression (Δx)2to an 4C(sin[(1/C)1/2((Δx)/2)])2.which is clearly valid for sufficiently small Δx. Another important class for which this method keeps the equation solutions are positivity and can be applied is those PDE's without advection term.
Calculation of Shear Capacity of Steel and Concrete Composite Beams Strengthened with FRP
Authors: Liang Jiong Feng , Yang Ze Ping , Wang Jian Bao , Li Jian Ping
Published: June 2012

Some calculated methods of shear capacity of RC beams strengthened with FRP (fiber reinforced polymer) are reviewed based on the experimental data on shear capacity of RC beams strengthened with FRP. Therefore, according to the destruction forms of steel and concrete composite beams strengthened with FRP, the formula for calculating the shear capacity of the beams are given. The formula is expressed clearly, simple and easy to use.
Application Development of Tensile Value with Prestressing Cramp Iron
Authors: Zeng Fan Xiang
Published: June 2012

Abstract: Tensioning for Concrete cramp iron usually is controlled by two rule: controlling tensioning stress is main, measuring elongation is auxiliary. The rate of elongation value is only for checking data. In this article, the author describes that if applying mathematics theory in forecasting the tensile value of prestressing cramp iron, the estimation for the tensile value will be more accurate. By more accurate value, the elongation measuring method can become a un-auxiliary method for tensile controlling method.
Shear Capacity Analysis of SRHSC Frame Joints
Authors: Zheng Shan Suo , Han Xie , Tao Qing Lin , Wang Wei
Published: June 2012

Based on the tests of 5 steel reinforced high strength concrete (SRHSC) frame interior joint specimens, this paper discusses the mechanism of load transference in the joints. Shear effect of each part of the joints including concrete, steel web, band, flange frame and stirrup is analyzed. And then, the shear capacity equation of SRHSC frame joints is presented. Comparing the calculation results with the test results, it is indicated that the shear capacity equation proposed can correctly evaluate the ultimate shear strength for SRHSC joints.
Practical Calculation Method of Force Method - Layered Force Method
Authors: Song Xiao Zhuang , Lu Ming Liang , Jin Ren Chao
Published: June 2012

According to the force method of solving of statically indeterminate structure is requirements of the primary structure, the primary structure can be a statically determinate structure also be a statically indeterminate structure. The higher degrees statically indeterminate problems, broken down into multi-layer lower degrees statically indeterminate problems, successive to solve, so time after time using lower degrees or even one degree force method typical equation, the less the solution or do not need to solve simultaneous equations, and solving the higher degrees statically indeterminate structure. On this basis, it can easily statically indeterminate structure with other solution methods in combination, to improve operational efficiency.
On the Use of GB50018 and AISI Speciﬁcations to Estimate the Load-Carrying Capacity of Cold-Formed Steel Lipped Channel Columns
Authors: Sun De Fa
Published: June 2012

This paper addresses the applicability of the provisions of Chinese (GB50018-2002, effective width method) and the AISI Speciﬁcations (AISI-DSM, direct strength method) to estimate the load-carrying capacity of cold-formed steel lipped channel columns. It is worth noting that GB50018-2002 and AISI-DSM adopt different approaches to perform this task: while the former is based on the “Effective Width” concept, the latter may adopt the ‘‘Direct Strength Method’’. First, the relevant aspects related to the experimental investigations are brieﬂy presented. Then, an extensive numerical study is performed by them, the estimates provided by them are compared with the experimental values. On the basis of these comparisons, some concluding remarks are drawn concerning the application of the GB50018-2002 and AISI-DSM design approaches.
Mechanical Behavior of Single-Lap Adhesive Joints with Reinforced Pins
Authors: Liu Jie Min , Zhu Wen Xiang
Published: June 2012

An approach to increasing the loading ability of adhesive joints by adding reinforced pins is presented. Following procedures are taken for making adhesive joints with reinforced pins: At first, holes are drilled at the overlap region of adherends, and then one hole is filled with a metal pin and adhesive. At the same time, adhesive is also applied on the surfaces of the overlap of adherends. After cured, the metal pin and the adhesive in one hole form an adhesive-metal reinforced pin. In this study, strengths of single-lap adhesive joints with the reinforced pins were measured experimentally. It is found that to well-bonded joints, (1) the strength of single-lap adhesive joints with adhesive-metal pins are obviously greater than those without adhesive-metal pins; (2) the strength of single-lap adhesive joints with adhesive-metal pins is highest when the pins are located at the positions of 5mm from the two ends of the overlap segment, the strength of single-lap adhesive joints with adhesive-metal pins is lowest when the pins are located at the middle of the overlap segment, about 10mm from the two ends of the overlap segment.
Catastrophe Model of Elastic Compression Pole Buckling
Authors: Wang Zhi Qiang , Du Yayin , Liu Feng
Published: June 2012

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Analysis on Parameters Influencing Max. Stress of Inner Rubber of Elastomeric Bearing
Authors: Shen Chao Yong , Ma Yu Hong , Zhuang Xue Zhen , Chen Yang Yang , Wang Shi Bin
Published: June 2012

In this paper, some factors effect on the maximum stress of inner rubber of some elastomer isolators with big diameter of 1500mm are analyzed by FEA. These factors include size of hole, ratio of , shear modulus of inner rubber , the first shape factor , thickness of cover rubber. The isolators include those used in building or bridge, loading condition is single compress . Research results show that size of hole, ratio of and have a little effect on the maximum stress of inner rubber, but shear modulus of inner rubber, and thickness of cover rubber hardly effect.
Identification of Local Time-Varying Systems Based on Dynamic Response Sensitivity
Authors: Zhang Kun , Li Hui , Duan Zhong Dong , Law S. S
Published: June 2012

A new method based on dynamic response sensitivity is proposed for the identification of local linear time-varying (LTV) system. The unknown local LTV structural stiffness is modeled by orthogonal polynomial approximations, and the sensitivities of structural dynamic response with respect to orthogonal coefficients are derived. The identification equation is set up based on Taylor’s first order approximation, and is solved with the damped least-squares method. A fifteen-story shear building is studied to validate the proposed method. Three ideal cases of LTV systems, with periodically, abruptly and randomly varying stiffness at the 8th story of the structure, are investigated to illustrate the capability of the algorithm to track the variations of the systems. Numerical simulation with noisy measured accelerations shows that the proposed method can accurately identify various kinds of local time-varying system from only several responses of the structure. This method provides a new approach for detecting local time-varying stiffness of structures with incomplete measured output information.
Frame - Shear Wall Structures Subjected to Vertical Deformation and the Shrinkage and Creep of Concrete Relations
Authors: Pan Lin , Zhang Li Wei
Published: June 2012

Frame - shear wall structural system are widely used in high-rise buildings . During the construction period , a different pressure than due to the loads and their respective axis , resulting in the existence of vertical deformation of the difference between the components , this difference will frame - shear wall structure beams internal forces have an important impact . The existence of concrete creep and shrinkage , so that the impact of further increase . A frame - shear wall structure high-rise buildings for the analysis object , using the finite element method , and analyze the impact of contraction of the construction process of concrete creep frame - shear wall structure of the vertical deformation and internal forces , a number of recommendations for the rationalization for structural analysis and design practical , in order to service engineering
Shaking Table Model Test of Steel Frame Structure
Authors: Cao Yu Sheng , Zhao Ya Ling , Li Jie
Published: June 2012

A1:4 scaled model made of steel is tested on the shaking table. The SAP2000 finite element analysis software is used to analyze the elastoplastic time-history of the model and to compare the results with the experimental data. The purpose of the test is to study the dynamic characteristics of the model’s structure as well as the model’s acceleration response and displacement response in different earthquakes. The experimental and the theoretical analysis basically obtained consistent results tested against each other.
Optimization of Yield Shear Coefficient for Parallel Base Isolation System
Authors: Rong Qiang , Sheng Yan
Published: June 2012

The optimization of yield shear coefficient for parallel base isolation system is investigated systematically. The maximum dissipative energy scale factor is used as the objective function, the maximum sliding displacement of a base-isolated layer, the residual displacement and the maximum base shear coefficient are considered the constraining factors. The optimal range of the yield shear coefficient is proposed by inputting the seismic waves of the different sites.
Experiment on a Concrete Filled Steel Tubular Arch with Corrugated Steel Webs Subjected to Spatial Loading
Authors: Gao Jing , Su Jia Zhan , Chen Bao Chun
Published: June 2012

To investigate the spatial performance of concrete filled steel tubular arch with corrugated steel webs, a static loading test has been conducted on an arch with a clear span of 6m subjected to in-plane and out-of-plane loading simultaneously. The structural behaviors such as load-displacement relation, ductility, distribution of strains in tubes and corrugated webs, were explored. Based on the results, it is demonstrated that the lateral deformation is the critical factor for the ultimate load-carrying capacity of the arch. In the whole process of test for the tubular arch, material non-linearity is dominant and geometrical non-linearity is subordinate. It could be concluded that the CFST-CSW arch shows good structural behavior and may be applicable in practice.
The FEM Analysis of Size Effect on Prism Concrete Specimens with Different Lengths under Loads of Axial Compression
Authors: Guo Er Wei , Li Zhen Bao , Ma Hua , Wang Wen Jing , Xie Yong Ping
Published: June 2012

Four prism concrete specimens with same height, same width, but different lengths is simulated in using ABAQUS FEM analysis software. The simulation work is conducted under monotonic axial compression loading, and its purpose is to research the size effect of prism concrete specimens, primarily to study the effect of specimen length on the axial compressive strength. The stress-strain relation of the specimen is analyzed. The results indicate that, for different lengths of specimens, their axial compressive strengths are quite different and the size effect on them is much obvious. The compressive strength improves gradually with the increasing of length, and size effect on transverse and vertical constraint stress of core concrete area is much distinct as well. Meanwhile, it can be obtained that the standard design method of the structures and components is conservative and of adequate security.
Experimental Study on Post-Anchoring Pulling-Out Bearing Capacity of Inorganic Materials in Concrete Test Cubes
Authors: Cui Shi Qi , Jiang Li Ping , Cheng Bo , Wang Tao
Published: June 2012

Through the test and observe the failure deformation in concrete test cube, the paper analyze the influence of concrete strength, concrete cover thickness, internal reinforcement cage(transverse reinforcement), reinforcement diameter on the inorganic material reinforcement adhesive property, providing theoretical basis for the code of Technical specification for post-anchoring used in concrete structure with inorganic anchoring material.
Research on Steel Beam-Column Joints of Concrete Filled Steel Tube
Authors: Li Ming , Liu Yong , Sun Zhe Zhe , Liu Yong Fang , Du Jing Feng
Published: June 2012

With the increasingly sophisticated theory of concrete filled steel tube (CFST) and its’ wide application, how to make the CFST steel beam-column joints (SBCJS) becomes one of the key problems in research. According to the relevant references in and abroad, types and research done on CFST SBCJ are introduced, including outer annular-stiffener type, Inner stiffening ring type connection with anchorages type, beam integral breakthrough type etc. Finally the key problems need to be further studied are promoted.
Experimental Investigation and Nonlinear Finite Element Analysis of U-Shaped Steel-Concrete Composite Beam
Authors: Li Wen Hu , Zhao Feng Hua
Published: June 2012

U-shaped steel –concrete composite beam is a new form of structure components. Through the test of three groups of specimens, the failure modes of structure components, the strain distribution of cross-section, and the load –deformation relationship are analyzed. A preliminary understanding of mechanical characteristics and deformation performance is got from the experimental investigation. The composite beam element is used to conduct nonlinear Finite Element Analysis. Based on the theoretical calculations and experimental investigation, a practical formula of U-shaped steel- concrete composite beam deformation is established. Moreover, the calculated result is in good agreement with the test results.
Numerical Analysis of Negative Skin Friction for Pile under Surface Loading by Particle Flow Code
Authors: Zhou Feng Xi , Lai Yuan Ming
Published: June 2012

Numerical simulations of soil-pile interaction under surface loading are performed by particle flow code in two dimensions. Considering an end-bearing pile subjected to flexible distribution load, the variety of negative skin friction is studied. Numerical results show that negative skin friction is variation with the increasing of surface loading, and the negative skin friction is decrease when the value is up to ultimate skin friction.
A Foundation Study of the Economic Analysis of Isolated Framework Structure
Authors: Wang Kai , Xiong Zhong Ming , Peng Ni
Published: June 2012

As a new seismic technique, the input acceleration is reduced effectively by the isolation technology. The social benefit of seismic isolation technology has been proved, but the economic effect still remains an insufficient understanding. Regarding that, this article take the actual projects as the background to analysis the isolation structure’s economic effect qualitatively, summed up a selection criteria of the isolated structure, lays a foundation for the promotion and application of the isolation technology
Vibration Test and Analysis on Medium-Speed Mill-Foundation Coupled System
Authors: Xu Bin , Peng Zhi Feng , Liu Fang , Peng Yi Liang , Zhang Feng Jian
Published: June 2012

To evaluate the vibration performance of medium-speed mill-foundation coupled system, eight mills in five thermal power plants were tested in site. The vibration displacement and acceleration of upper and lower bedplates of foundations and equipment bodies were measured. According to the test results, the vibration safety of mills is evaluated. The study shows that the vibration displacement of medium-speed mill with spring vibration-isolated foundation meets the code requirements, but the vibration displacement of equipment body is larger. The vibration displacement of equipment body should be controlled by limiting the vibration displacement of foundation platform in design.
Simplify Analysis on Anti-Continuity Collapsed Frame Structure of Isolation Bearings and Non-Isolation Bearings
Authors: Duan Shao Wei , Lu Duan
Published: June 2012

Base isolation is an effective measure of anti-progressive collapse in frame structure. This article contrastive analysis the earthquake resistance of structure which have isolation bearings and which have not isolation bearings by the use of static analysis, and then use the discrete element method to establish simplified model about the system of base isolation. It also research the isolated effect under horizontal seismic force after the middle column failed .The conclusion that we get in this paper have practical significance in engineering.
Influence of Various Inclinations of Webs on Anti-Torsion Characteristic of Steel-Concrete Composite Box Girder
Authors: Hu Xu Hui
Published: June 2012

Applying FEM Analysis Software to the analysis that under the conditions of webs with inclinations of 15°，20°，25°，30°，35°，40°, the girders appear mid-span transformation, the concrete stress of the base plate and the stress of the steel webs at the fulcrum. The results of the research show that the increase of the inclination of the web can facilitate the anti-torsion performance of the composite box girders.
Study on Isolated Layer Mechanics Character of Combined Base Isolated Structure Based on Axial Forces Redistribute
Authors: Zhang Fu You , Gu Ming , Song Yun , Xu Song
Published: June 2012

Abstract：Combined isolation system is combined with rubber bearings which provide resilience forces and sliding isolated bearings which provide damp. According to the rule of axial forces redistributing between two kinds of bearings under earthquake, a calculating method considering the vertical force redistribute of isolation layer was given. With this method, the results of an example show that axial force will transfer from rubber bearings to sliding isolated bearings along with the horizontal displacement of isolation layer. The bigger the displacement is the more axial force transfers. So the axial-forces redistribution is a self-adjustable performance of the system, and also is an advantage for the system.
Contrastive Finite Analysis of SRC Frame under Cyclic Loading Base on Macroscopic and Microscopic Element
Authors: Zheng Shan Suo , Wang Wei , Hou Pi Ji , Xie Ming
Published: June 2012

A macroscopic finite element model and a microscopic one were set up respectively to simulate SRC frame with two bays and three stories under cyclic loading, by comparing the simulation and test results, the authors find that the results obtained from the two finite methods have few differences, and each of them can satisfy the demands of engineering, but the principles established in simulation process were different. The macroscopic finite element model was established by very few elements and the results data were obtained easily and quickly, however, it just attain some macroscopic mechanics data (axial force, bending moment and shearing force etc.). The microscopic finite element model involves complex modeling principle, not only needs more time for dealing with the geometry model, gridding and boundary conditions and so on, but also limited by professional knowledge, which make users establish a correct model hardly. The comparison shows that macroscopic finite element method has many advantages in engineering fields.
Experimental Study on Shear Behavior of Hybrid Fiber Reinforced High Performance Concrete Deep Beams
Authors: Liu Sheng Bing , Xu Lihua
Published: June 2012

In order to investigate the effect of steel fiber and polypropylene fiber on shear behavior of HPC deep beams, the shear tests were conducted on 18 different groups of deep beams with steel fiber and polypropylene fiber and 2 groups of HPC deep beams without fiber according to the orthogonal experiment. 6 factors, including the shape of steel fiber, the volume fraction of steel fiber, the aspect ratio of steel fiber, the volume fraction of polypropylene fiber, the ratio of web horizontal reinforcement and the ratio of web vertical reinforcement, were compared by direct-viewing analysis. Results illuminate that hybrid fibers greatly increase the diagonal cracking strength and shear strength of HPC deep beams. The aspect ratio of steel fiber plays the most important role in diagonal cracking strength whereas the ratio of web vertical reinforcement has minimum effect. Meanwhile the ratio of web horizontal reinforcement plays the most important role in shear strength whereas the volume fraction of polypropylene fiber has minimum effect. An anti-cracking capacity for inclined section calculation formula and a shear bearing capacity calculation formula for hybrid fiber reinforced HPC deep beams are put forward based on current code. Meantime test verification is carried out and the calculated results are satisfied.
Research Based on Relationship between Micro-Structural Damage and Intensity Attenuation Laws of Water-Bearing Limestone
Authors: Liu Shu Xin , Liu Chang Wu , Kang Yaming , Yang Duo
Published: June 2012

Rock strength is closely related to composition and internal structure of water-bearing rock. By using scanning electron microscopy, This paper analyses limestone composition and micro-structural damage mechanisms in the water physical and chemical effects. Besides, By combining with triaxial compression test according to natural state and saturated state of rock samples, and by applying mohr-coulomb strength criterion based on the basic concepts of damage mechanics, The paper obtains the quantitative expression of micro-structural damage by using statistical methods. Finally, The paper establishes the relationship between compressive strength and micro-structural damage and discusses evolution laws of micro-structural damage in limestone under complex stress state, The results show that degree of micro-structural damage increase as the water affection, further more, The correlations between micro structural damage and the compressive strength of water-bearing limestone shows a nonlinear relationship according to different confining pressure.
Integral Space Concrete Roof Structure System Optimization Research
Authors: Zhao Ke Chao , Zhao Jin Cheng , Jiang Meng
Published: June 2012

Based on the experimental study, summarizes the disadvantages of the test roof; On the same premise of the roof to keep the overall appearance, the structural system of the roof is optimized ; The content of the optimized structural system includes the layout of the structural system, the establishment of the calculation model, the optimization of internal support system, the calculation of kinds of members, etc.; The integrity of the roof are enhanced after optimization, and more accord with the concrete shell space structure characteristics, and provided a convenient for the big water construction. Compared to the traditional roof, the optimized roof save about 30% of the costs.
Bearing Capacity Analysis of Square Concrete–Filled Steel Tubular Column Based on RC Column with Spiral Stirrup
Authors: Wang Tie Cheng , Du Chuang , Zhao Hai Long
Published: June 2012

According to the confined characteristic of square concrete–filled steel tubular(CFST) column, core concrete zone was divided into the weak confined zone and the strong confined zone.A formula is derived for estimating the bearing capacity of square CFST column by analogy RC column with spiral stirrup. The proposed formula was used to calculate the existing experiments,the results showed that the computing values agreed well with the experimental values. The paper can be seen as a valuable guide for computing the bearing capacity of square CFST column.
Investigation on Dynamic Response of Steel Tower Structure under Time-History Wind Load
Authors: Chen Jun Wu , Li Liang
Published: June 2012

According to the Autoregressive Model in linear filter, the procedure, which was used to transform frequency domain to time domain, was programmed to simulate time history wind load with spatial correlation at different height of the tower by dint of numerical analysis software MATLAB. And then in virtue of the finite element software SAP2000, the nonlinear dynamic analysis to the steel structural tower under the time history wind load was made to gain the time history displacement, time history velocity and time history acceleration. Finally the comparison between static wind load displacement response and time history wind load displacement response was made to analyze the error of the static wind analysis.
Pull-Out Strength of Headed Bar According to the Lateral Confinement Effect of Reinforced Concrete Beam-Column Joint
Authors: Yoon Seung Joe , Seo Soo Yeon
Published: June 2012

This research is aimed at evaluating pull-out capacity through the pull-out test of the reinforced headed bar, a mechanical anchorage, that can replace standard hook. The reason for the weak standard hook making congestion of bars of beam, which is a problem of the reinforced concrete beam-column joint so that it causes the stress concentration inside the joint. As the variables for this test, the hook type that anchored the reinforced headed bar at the beam-column joint, hoop-reinforced type, and the transverse reinforcement type were selected. The researcher analyzed fracture pattern of the test specimens regarding each variable, and the deformation pattern according to load as well. The results from the comparison of the specimens according to the type of laterally confined bar revealed that, though the type of longitudinal bar and of hoop reinforcement were identical, the yield and maximum load of the test specimen of which type of the laterally confined bar was a cross was high as much as 8% and 9% respectively.
Numerical Analysis and Optimization on Dynamic Performance of Large Turbo Generator Frame Foundation
Authors: Wang Bai Sheng , Cao Dong Hui , Yang Ying Wu , Xu Chun Xiao , Qian Hua Jun
Published: June 2012

A space numerical model about 1000MW turbo generator foundation of a power plant is established by ANSYS software, meanwhile analyzing the model’s vibration characteristics and response under the turbo generator working conditions. According to the existing norms, optimizing the foundation based on the linear displacement amplitude control, furthermore researching the corresponding dynamic on the optimized foundation for guidance to structural design.
Five Developed Cylinder Reticulated Shell ANSYS Parametric Modelings
Authors: Lu Xiao Yang , Wang Zhi Dan , Zhao Xiao Wei , Chao Wang
Published: June 2012

Based on the geometric characteristics of developed cylinder shell, five methods of node generation and element connection were proposed in the cylindrical coordinate system. The corresponding macro programmers were made by means of ANSYS software parametric design language. Five developed cylindrical shell parametric modelings were achieved under the conditions of the given shell types, span, vector height, length, the grid number of length wise direction and cross wise direction. Applied examples show that this parametric modeling method and programmers are simple, efficient and useful, which facilitate the force analysis and optimizing design under different types and parameter by means of ANSYS software.
Seismic Performance Evaluation on Eccentrically Brace Steel Frame by Capacity Spectrum Method
Authors: Yongkang Shen , Zhengzhong Wang
Published: June 2012

According to the seismic demand spectra form the code for seismic design of buildings, seismic performances of eccentrically braced steel frames (EBF) in frequently, fortification and seldom occurred different intensity earthquakes were evaluated by the Capacity Spectrum Method (CSM). The capacity curves derived from base force-top displacement curves of structures subjected to the lateral seismic load of seismic codes were obtained from pushover analysis by applying sap2000 software and transformed to the spectrum curves, seismic performance were evaluated according to the intersection between the seismic demand spectra and the capacity spectrum. Seismic performances of 15 EBFs designed according to the Chinese design codes were evaluated by CSM. The certain ductility and displacement capacity of EBF in accordance with the China corresponding design codes are shown and some reference is suggested.
Bearing Capacity Analysis on Slotted End Plate Connection Joints of Different Types
Authors: Qiang Ruo Hui , Su Ming Zhou , Yang Junfen , Cui Jinbo
Published: June 2012

Four different types of full-scale slotted end plate (SEP) connection joints are tested to determine their failure modes and damage mechanisms under ultimate loading. Researches on mechanical behaviors of I-type, T-type, U-type and Groove SEP connection joints bearing compression are studied, which also analyze their force-displacement behaviors and developing processes of deformation and strain. The results show that the bearing capacities of I, grooved, T and U types SEP connections are increased gradually, which indicate the SEP’s type has great influence on the ultimate strength of joints. The instability of SEP is the main factor to cause the loss of bearing capacity of the connection, which is shown through the development of strain, that SEP enters into plastic stage and the other regions still are elastic.
On the Influence of the Elastic Medium Stiffness in the Buckling Behavior of Compressed Beams on Elastic Foundation
Authors: de Angelis Fabio , Cancellara Donato
Published: June 2012

In the present work the stability and buckling behavior of compressed beams on elastic foundation are analyzed. The influence of the elastic stiffness of the medium on the overall stability of the structural system is investigated. The analysis is performed via energetic methods. The buckling loads are evaluated as a function of the stiffness of the beam and the stiffness of the elastic medium. Considerations are illustrated on the influence of the elastic medium stiffness and on the effects of the ratio of the length of the beam and the characteristic half-wave on the stability of the structural system.
The Parametric Design Method of the Globoid Cam Based on the Software of ProEngineer
Authors: Liu Qing Li , Tsai Albert , Yao Su Fen , Wang Edmund
Published: June 2012

Cam mechanisms are widely used in automated machines. Globoid cam has received widespread attention for its eminent kinematics and dynamic performance in research and application. As a commonly used cam mechanism in industry, especially in the field of industrial robots, Globoid Cam has the advantages of being highly efficient, highly accurate and relatively cheap. This study used ProEngineer to create a 3D model of the Globoid Cam mechanism. This paper describes the steps used to create a 3D model of the Globoid Cam, and the basic principles behind the parametric 3D modeling method.
Experimental Study on Vertical Base-Isolated System with Disk Spring
Authors: Zhao Yamin , Su Jingyu , Lu Ming
Published: June 2012

A new vertical isolator designed by disk spring, called combined disk spring bearing (DSB), is introduced in this paper. DSB is composed of one main disk spring bearing and eight secondary disk spring bearings. Performance tests show that DSB had good property of variable vertical stiffness and high vertical damping. Then, the effectiveness of DSB vertical base-isolated devices in reducing structural responses caused by earthquakes through a series of 1/2 scale shaking table tests. are conducted to study the seismic responses of the and the DSB vertical-isolated system. Compared with the fixed-base system, experimental results show that the DSB vertical-isolated system can isolate vertical earthquake energy remarkably. Large displacement of the DSB vertical-isolated system occurred on the isolation layer, and the inter-story deformation of the superstructure changed slightly. The acceleration responses of DSB vertical-isolated system decreased more than 50% and the displacement responses decreased more than 40% at 0.4g PGA, which confirmed that DSB could decrease the seismic responses effectively.
A New Type of Pile – Long with Cushion-Short without Cushion Rigid Pile
Authors: Zhang Ming Fei , Yang Guang Hua , Wang En Qi
Published: June 2012

At present, in the deep soft soil area, pile types of composite foundation include rigid-flexible and long-short piles, rigid long- short pile , pile partner, and this paper proposes a new type of pile - rigid long-short piles with no cushion short pile. Using the one Finite element software Midas- GTS , this paper compared these pile types ,in vertical direction element stress, pile-soil stress ratio and cushion stress level the cushion of pile-soil stress ratio and stress level, to illustrate the advantages of the new pile.
A Finite Element Model for Simulating Out-of-Plane Behavior of Masonry Infilled RC Frames
Authors: Zhai Chang Hai , Kong Jing Chang , Wang Xiao Hu
Published: June 2012

The in-plane seismic performance has been studied by many researchers all over the world, whereas few studies have been done on the out-of-plane behavior of the infilled RC frames. In this paper, a separate finite element model for simulating the out-of-plane failure mode and capacity of masonry-infilled RC frames is developed using 3-D elements with damage-plasticity material model and the surface-based contact cohesive interaction model simulating the interface between blocks. Comparison between the results of analysis and experiment indicates that the present model can successfully simulate the out-of-plane behavior of the structure.
Optimization Simulations of Support System by Composite Soil-Nail Retaining Structure
Authors: Huang Jian Hua , Song Guang , Song Er Xaing
Published: June 2012

Mechanism of composite pre-reinforced micro pile soil-nail and pure soil-nail retaining structure in foundation-pit engineering are analyzed in this paper through general three dimension nonlinear numerical simulation software. Research contents include whole construction process simulation of construction such as excavation by steps, piles and soil-nail installation and panel manufacture etc. By the comparison of mechanical characteristics between the pure soil-nail and composite soil-nail retaining structures in the same slope engineering example, differences of tension distribution range of soil layer, deformation features, mechanical characteristics of support and axial force distribution along nails etc. are analyzed. Research results are verified by in-site projects and measured data. The action mechanism and working performance of composite soil-nail retaining support are also systematically studied and theoretical basis can be provided in the similar application.
Research of Two-Way Curved Arch Bridge Reinforced by BFRP
Authors: Huo Bao Rong , Zhang Xiang Dong
Published: June 2012

The target of this test is to research the mechanical characteristics of two-way curved arch bridge reinforced by BFRP，and prove that the method is effective. Considering the cause of old and dangerous two-way curved arch bridge, Aohan, static and dynamic characteristics of the bridge are studied by being reinforced by BFRP .Reinforcement of arch rib with BFRP can reduce the compressive stress in the apex of arch, springing and other key sections, and enhance the bending and torsion resistance properties of the structure. After reinforcement, it has a better overall performance and keeps a flexible working condition.And if the load becomes 1.9 times that of road -Ⅱ,it has enough extra ability to be functionable. The method to reinforce arch bridge type is effective and deserves the cost.The result of the research is important and valueable to bridges in the similiar situations.
Multi-Storey Reinforced Concrete Frame Structure Earthquake Response Analysis
Authors: Wang Cai Hua , Wu Jian Feng
Published: June 2012

Using ANSYS software, the paper analyze the seismic response to Kobe one-dimensional seismic wave of multi-storey reinforced concrete frame structure, and make comparison with the calculation of response spectrum method.