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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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Fiber pullout with stress transfer and fracture propagation

Fiber pullout with stress transfer and fracture propagation

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2014 International Conference on Industrial,Mechanical and Manufacturing Science(ICIMMS 2014)

作者： J.Y.Wu H.Yuan H.W.Gu MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan University

In this paper,a nonlinear fracture mechanics approach has been introduced to derive theoretical solutions for the shear stress transfer and crack propagation along the interface of the pull-pull and pull-push fiber-matrix pullout model by using the assumed bilinear local bond-slip *** for the maximum load,shear stress and crack propagation along fiber-matrix interface are derived ***,numerical simulations are conducted to discuss the factors influencing the interfacial *** this paper emphasizes on fiber-matrix pullout test,the analytical solution is equally applicable to similar test between spindly bars of other materials and concrete.

关键词： crack propagation FRP interfacial mechanics fracture mechanics

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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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Full-range behavior of FRP-to-concrete bonded joints with trilinear bond-slip law

Full-range behavior of FRP-to-concrete bonded joints with tr...

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5th International Conference on Structural engineering, mechanics and Computation, SEMC 2013

作者： Yuan, H. Wu, L. MOE Key Lab of Disaster and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China

ISBN: (纸本)9781138000612

This paper presents a close-form analytical solution of both interfacial shear stress distribution and load-displacement response, which is capable of predicting the entire debonding propagation process including elastic, elastic-flow, elastic-flow-softening, elastic-flow-softening-debonding, flow-softening-debonding, and softening-debonding stages. Based on experimental result of high Young's modulus type of CFRP plateto- concrete bonded joints, a nonlinear fracture mechanics method, in which the tri-linear local bond slip law is employed, is used to understand the stress transfer mechanism, interfacial crack propagation and ductility behavior in adhesive bonded joint. It is also shown how experimental load-displacement response of bonded joints can be used to identify interfacial properties, including the interfacial fracture energy and parameters of the local bond-slip relationship. The concept of serviceability limit state and ultimate limit state is considered. © 2013 Taylor & Francis Group, London, UK.

关键词： Debonding

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GREEN QUASIFUNCTION METHOD FOR FREE VIBRATION OF CLAMPED THIN PLATES

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Acta Mechanica Solida Sinica 2012年第1期25卷 37-45页

作者： Shanqing Li Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan UniversityGuangzhou 510632China

The Green quasifunction method is employed to solve the free vibration problem of clamped thin plates.A Green quasifunction is established by using the fundamental solution and boundary equation of the *** function satisfies the homogeneous boundary condition of the *** mode shape differential equation of the free vibration problem of clamped thin plates is reduced to Fredholm integral equation of the second kind by Green *** of the kernel of integral equation is overcome by choosing a suitable form of the normalized boundary *** examples demonstrate the validity of the present *** with both the series solution and ANSYS finite-element solution shows fine *** present method is a novel and effective mathematical one.

关键词： Green function integral equation R-function clamped thin plates free vibration

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A SI-based algorithm for structural damage detection

A SI-based algorithm for structural damage detection

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3rd International Conference on Swarm Intelligence, ICSI 2012

作者： Yu, Ling Xu, Peng Chen, Xi 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)9783642309755

As a challenging task in the structural health monitoring (SHM) field, structural damage detection, one of most important issues of the SHM system, is mathematically converted into a constrained optimization problem, which is then hopefully solved by a swarm intelligence (SI) based algorithm proposed in this paper. The performance of the proposed algorithm is experimentally evaluated by the measured data of four damage patterns of a building model of 3-storey steel frame structure made in laboratory. Some illustrated results show that the proposed method is very suitable for the structural multi-damage identification, which also show that the SI-based algorithm for structural damage detection can provide an effective and robust tool in the SHM field. © 2012 Springer-Verlag.

关键词： Damage detection

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Out-of-plane compression and impact of woven textile sandwich composites

Out-of-plane compression and impact of woven textile sandwic...

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2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012

作者： Zhao, Long Fan, Hualin Huang, Shiqing PLA University of Science and Technology Nanjing China Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University Nanjing China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China MOE Key Lab. of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9780769547725

Woven textile sandwich composite (WTSC) is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies. © 2012 IEEE.

关键词： Honeycomb structures

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Out-of-plane Compression and Impact of Woven Textile Sandwich Composites

Out-of-plane Compression and Impact of Woven Textile Sandwic...

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第三届数字制造与自动化国际会议

作者： Long ZHAO Hualin FAN Shiqing HUANG PLA University of Science and Technology Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University State Key Laboratory of Automotive Safety and Energy Tsinghua University MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University

Woven textile sandwich composite （WTSC） is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies.

关键词： woven textile sandwich composite out-of-plane compression low-velocity impact

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Green Quasifunction Method for Bending Problem of Clamped Orthotropic Trapezoidal Thin Plates on Winkler Foundation

Green Quasifunction Method for Bending Problem of Clamped Or...

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The 2nd International Conference on applied mechanics and Mechanical engineering(ICAMME 2011)

作者： Shanqing Li Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University

ISBN: (纸本)9783037852965

The Green quasifunction method(GQM) is applied to solve the bending problem of clamped orthotropic thin plates with trapezoidal boundary shape on Winkler foundation. Firstly the governing differential equation of the problem is reduced to the boundary value problem of the biharmonic operator, and then it is reduced to the Fredholm integral equation of the second kind by Green's formula. A Green quasifunction is established by using the fundamental solution and the boundary equation of the problem. This function satisfies the homogeneous boundary condition of the problem. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The comparison with ANSYS finite element solution shows good agreement. The proposed method is a novel and effective mathematical one.

关键词： Green's function integral equation R-function Winkler foundation bending of orthotropic plate

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