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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Chen, Mu Xue, Jiang Hong Gan, Neng Department of Mechanics and Civil Engineering Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038351948

We use the finite element software Midas FEA to set up space entity model, and discuss various factors including the stiffness of bearing, counteracting force of adjacent beam, the influence of the stiffness of bridge pier on reaction at support. In the practical engineering. Coupling of shear lag, stiffness of beam, bending-torsional coupling and partial load can also affect the redistribution of reaction at support. Through the simulation of the finite element software, we check the support of a railway bridge in Guangzhou city. In the end we found that the stiffness of beam can make the middle support have a tendency to increase. If we take all the factors into account, the force of the middle support will be greater than on the both ends of bearing and the force on the both ends of bearing will be approximately equal. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Entity analysis of shear lag about grooved beam

Entity analysis of shear lag about grooved beam

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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Chen, Mu Xue, Jiang Hong Gan, Neng Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038351948

We establish the entity model of groove beams in Midas FEA. Then we compare and analysis the shear lag effect of prestressed reinforcement caused in different locations. It can provide some suggestions for prestressed rib of groove beams. The result shows that when the prestressed steel beam is located in the middle of small beam, the effect of shear lag is maximum and the shear lag effects of prestressed in two ends are similar, Prestressed reinforcement can be arrangement refer to the results. © (2014) Trans Tech Publications, Switzerland.

关键词： Reinforcement

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Optimal sensor placement based on Tabu search algorithms

Optimal sensor placement based on Tabu search algorithms

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Zhan, Jie Zi Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783038351641

In this study, the Tabu search (TS) algorithm is introduced into the optimal sensor placement (OSP) problem in the field of the structural health monitoring and moving force identification. A TS-based OSP procedure is proposed and further evaluated by some numerical simulations on a 2D planar truss model. The mean values of off-diagonal elements in a modal assurance criterion (MAC) matrix are used as the optimization objective function. Based on the criteria of MAC, determinant of fisher matrix, matrix condition number, and the least mean square error, the TS-based OSP procedure is evaluated through comparing with ones due to both of the energy coefficient-effective independence (ECEFI) and the effective independence (EFI) algorithms. The results show that the proposed TS-based OSP procedure is feasible with a higher accuracy. © (2014) Trans Tech Publications, Switzerland.

关键词： Structural health monitoring

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A two step damage prognosis method for beam-like truss structures

A two step damage prognosis method for beam-like truss struc...

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Jia, Hao Kai Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783038351641

In this study, a two step damage prognosis method is proposed for beam-like truss structures via combining modal curvature change (MCC) with modal strain energy change ratio (MSECR). Changes in the modal curvature and the elemental strain energy are selected as the indicator of damage prognosis. Different damage elements with different damage degrees are simulated. In the first step, the finite element method is used to model a beam-like truss structure and the displacement modes are got. The damage region is estimated by the MCC of top and bottom chords of a beam-like truss structure. In the second step, the elemental MSECR in the damage region is calculated and the maximum MSECR element is deemed as the damage element. The simulation results show that this method can accurately locate the damage in the beam-like truss structure. © (2014) Trans Tech Publications, Switzerland.

关键词： Strain energy

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The status analysis and suggestions of graduation practice for undergraduates majoring in mining engineering

The status analysis and suggestions of graduation practice f...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Shi, Jian Jun Tian, Duo Zhao, Qi Feng Key Lab. of Mine Disaster Prevention and Control Hebei 065201 China Safety Engineering College North China University of Science and Technology Beijing-east Yanjiao 065201 China

ISBN: (纸本)9783038351375

Graduation practice, which is carried on after the students have completed all the major courses, is an important part of practical teaching. It is the basis of graduation design and thesis. We took students to a mine in Zhang Village, located in the middle energy area of Hebei Province, and realized some problems existing in the practice of mining engineering. In this paper, we propose some measures adopted in the practice and their effects. Furthermore, we propose some suggestions for improvement. © (2014) Trans Tech Publications, Switzerland.

关键词： Teaching

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CONTACT ANALYSIS FOR FIBER-REINFORCED, DELAMINATED LAMINATES WITH KINEMATIC NONLINEARITY

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Acta Mechanica Solida Sinica 2013年第4期26卷 388-402页

作者： Jianghong Xue Li Zi Hong Yuan Renhuai Liu Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education

A macro-micro analytical approach for the anti-penetrating contact problem at the interfaces of the delamination in symmetrically cross-plied,fiber-reinforced rectangular laminates is presented in this *** laminate is simply supported and subjected to a uniform transverse load with a through-width delamination buried at the center position.A contact factor is defined to characterize the contact effect and determined using the micro-mechanics of composite *** analyzing the kinematics of nonlinear deformation at the interfaces of the delamination,the contact force is *** solutions from perturbation analysis are *** is found that the deformation of the laminate involves a global deflection and a local *** antipenetrating contact effects are characterized by the local buckling and are intrinsic properties of the laminates,relying only on the geometries of the delamination and the material *** analyses show that the location and size of the contact areas and the distribution of the contact force are hardly affected by the aspect ratio.

关键词： rectangular laminate delamination contact effect perturbation approach nonlinear analysis

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Research on Preparation of Concrete by Sea Sand

Research on Preparation of Concrete by Sea Sand

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2012 2nd International Conference on Smart Materials and Nanotechnology in engineering(SMNE 2012)

作者： Dong OuYang Xiaowei OuYang Bo Ning Xilian Wen Yanli Lin MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Materials Science and Engineering Jinan University Guangzhou Residential Construction Development CO. LTD

The effects of fine aggregates on the performance of cement mortar was studied, and using sea sand as fine aggregates to prepared high-performance concrete, relative experimental studies on the workability, mechanical properties and durability are respectively carried outThe results showed that the compressive strength of cement mortar made by sea sand is smaller than river sand, but higher than river sand on flexural strengthThe workability,28 d compressive strength and splitting tensile strength of concrete made by sea sand are excellent than river sand, and the rate of early strength developed rapidlyThe resistance to penetration of chloride ions into sea sand concrete tested by ASTM C1202 and NEL, have reached a evaluation standard of "very low".

关键词： Sea sand High-performance concrete Mechanical properties Durability

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Two-dimensional analyses of delamination buckling of symmetrically cross-ply rectangular laminates

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Applied Mathematics and Mechanics(English Edition) 2013年第5期34卷 597-612页

作者：薛江红罗庆姿韩峰刘人怀 Department of Mechanics and Civil Engineering Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Beijing Institute of Technology State Key Laboratory of Explosion Science and Technology

The conventional approach to analysis the buckling of rectangular laminates containing an embedded delamination subjected to the in-plane loading is to simplify the laminate as a beam-plate from which the predicted buckling load decreases as the length of the laminate increases. Two-dimensional analyses are employed in this paper by extending the one-dimensional model to take into consideration of the influence of the delamination width on the buckling performance of the laminates. The laminate is simply supported containing a through width delamination. A new parameterβ defined as the ratio of delamination length to delamination width is introduced with an emphasis on the influence of the delamination size. It is found that （i） when the ratio β is greater than one snap-through buckling prevails, the buckling load is determined by the delamination size and depth only; （ii） as the ratio β continues to increase, the buckling load will approach to a constant value. Solutions are verified with the well established results and are found in good agreement with the latter.

关键词： two-dimensional analysis rectangular laminate delamination buckling laminate theory

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Effective elastic moduli of fiber-reinforced polymer matrix composites filled with nano-particle

Effective elastic moduli of fiber-reinforced polymer matrix ...

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2nd International Conference on Mechanical Properties of Materials and Information Technology, ICMPMIT 2013

作者： Zhang, Hui Zhang, Zong Fu Xu, Jia Chu Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Guangzhou China

ISBN: (纸本)9783037858608

Effective moduli of fiber-reinforced polymer matrix composites filled with nano-particle considering the effect of linear change of interphase are presented in this paper. The three-phase inclusion problem for matrix-interface-particle is equivalent to the Eshelby two-phase inclusion problem. According to the result of the Eshelby inclusion problem, the effective modulus tensor of unit cell of equivalent particle is derived. The effective moduli of equivalent matrix are given based on Mori-Tanaka method. Using two fundamental equation of micromechanic theory, the three-dimensional bridged formulation of unidirectional composites is derived. The quantitative relationship between the macroscopic elastic parameters and the structural parameters of the fiber-reinforced polymer composites filled with nano-particles is investigated. Effects of the thickness of interfacial layer, the particle size and the volume fraction of nanoparticles on the effective elastic moduli of the composites are also discussed. © (2013) Trans Tech Publications, Switzerland.

关键词： Homogenization method

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Experimental investigations on mechanical properties and fire resistance of steel-polypropylene hybrid fiber reinforced concrete

Experimental investigations on mechanical properties and fir...

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2013 International Conference on Future Energy and Materials Research, FEMR 2013

作者： Ouyang, Dong Kong, Lin Jie Fu, Hao Lu, Liu Lei Liao, Long Huang, Chen wu MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangdong 510632 China Center for Engineering Materials and Struture Durability Research Jinan University Guangdong 510632 China

ISBN: (纸本)9783037857892

This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber reinforced concrete is the best. © (2013) Trans Tech Publications, Switzerland.

关键词： Polypropylenes

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