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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Huanlin Liu Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9781509040940

Moving force is very important for bridge design, structural analysis and structural health monitoring. Some studies on moving force identification (MFI) attract extensive attentions in the past decades. A novel two-step MFI method is proposed based on particle swarm optimization (PSO) and time domain method (TDM) in this study. The new proposed MFI method includes two steps. In the first step, the PSO is used to identify the constant loads without matrix inversion. In the second step, the conventional TDM is employed to estimate the rest time-varying loads where the Tikhonov regularization and general cross validation (GCV) are introduced to improve the MFI accuracy and to select optimal regularization parameters, respectively. A simply supported beam bridge subjected to moving forces is taken as a numerical simulation example to assess the performance of the proposed method. The illustrated results show that the new two-step MFI method can more effectively identify the moving forces compared to the conventional TDM and the improved Tikhonov regularization method, the proposed new method can provide more accurate MFI results on two moving forces under eight combinations of bridge responses.

关键词： Bridges Force Time division multiplexing Acceleration Particle swarm optimization Time-domain analysis Numerical simulation

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Identification of joint equivalent parameters via combining PSO with FE model updating

Identification of joint equivalent parameters via combining ...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Wenfeng Luo Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9781509040940

In this study, the finite element (FE) model updating method and particle swarm optimization (PSO) algorithm are combined to identify joint equivalent parameters by converting the inverse problem into an optimization problem. First, the natural frequency and frequency response function (FRF) of assembled structures are regarded as an index of the dynamic characteristics. The objective function is defined by minimizing index relative errors between FE model and assembled structures. And then the PSO algorithm is used to solve the optimization problem. The noise effect on the method is also considered. The illustrated numerical simulation results show that the proposed method can identify the equivalent parameters with a good robustness to noises as well as with a high efficiency.

关键词： Fasteners Linear programming Mathematical model Heuristic algorithms Computational modeling Algorithm design and analysis Damping

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Fiber pullout with stress transfer and fracture propagation

Fiber pullout with stress transfer and fracture propagation

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

作者： Wu, J.Y. Yuan, H. Gu, H.W. MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China

ISBN: (纸本)9781138026568

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 model. Expressions for the maximum load, shear stress and crack propagation along fiber-matrix interface are derived analytically. Finally, numerical simulations are conducted to discuss the factors influencing the interfacial behavior. Though 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. © 2015 Taylor & Francis Group, London.

关键词： Shear stress

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Fracture failure analysis of Fiber Reinforced Composites T-joints

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IOP Conference Series: Materials Science and engineering 2017年第1期207卷

作者： Wei Su De-zhi Kong Ren-huai Liu Shi-qing Huang Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

This paper discusses staple FRP T-joints on the project based on the classical beam theory of Euler-Bernoulli and a theoretical model of energy release rate is set up to discuss fracture propagation of composite T-joints. The paper is further analysis on fracture failure affected by composite pane depth and joints chamfer dimension parameters and so on. The conclusion benefit for extensive use of projects is also summarized.

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Mechanical Deformation Mechanism of Fiber Reinforced Composites T-joints

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IOP Conference Series: Materials Science and engineering 2017年第1期207卷

作者： Wei Su Ke-qiang Cheng Ren-huai Liu Shi-qing Huang Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

In this paper, we focus on the need for ideal theory analytical solution of mechanical deformation mechanism for T-joints. Through removing unnecessary constraints, stress equivalence system of T-joints can be established by force method. Solution equations of unknown nodal forces and the total vertical displacement can also be obtained, and this result can be used to evaluate strength of FRC T-joints.

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Structural damage detection and moving force identification based on firefly algorithm 6th

Structural damage detection and moving force identification ...

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6th International Conference on Swarm Intelligence, ICSI 2015 held in conjunction with the 2nd BRICS Congress on Computational Intelligence, CCI 2015

作者： Pan, Chudong Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9783319204659

Based on firefly algorithm (FA), a structural damage detection (SDD) and moving force identification (MFI) method is proposed in this paper. The basic principle of FA is introduced, some key parameters, such as light intensity, attractiveness, and rules of attraction are defined. The moving forcesinduced responses of damage structures are defined as a function of both damage factors and moving forces. By minimizing the difference between the real and calculated responses with given damage factors and moving forces, the identified problem is transformed into a constrained optimization problem and then it can be hopefully solved by the FA. In order to assess the accuracy and the feasibility of the proposed method, a three-span continuous beam subjected to moving forces is taken as an example for numerical simulations. The illustrated results show that the method can simultaneously identify the structural damages and moving forces with a good accuracy and better robustness to noise. © Springer International Publishing Switzerland 2015.

关键词： Structural health monitoring

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An improved PSO-NM algorithm for structural damage detection 6th

An improved PSO-NM algorithm for structural damage detection

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6th International Conference on Swarm Intelligence, ICSI 2015 held in conjunction with the 2nd BRICS Congress on Computational Intelligence, CCI 2015

作者： Chen, Zepeng Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control In Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9783319204659

A hybrid particle swarm optimization (PSO) combined with an improved Nelder-Mead algorithm (NMA) is proposed and introduced into the field of structural damage detection (SDD). The improved NMA chooses parts of subplanes of the n-simplex for optimization, a two-step method uses modal strain energy based index (MSEBI) to locate damage firstly, and both of them can reduce the computational cost of the basic PSO-Nelder-Mead (PSO-NM). An index of solution assurance criteria (SAC) is defined to describe the correlation between the identified and actual damage of structures. Numerical simulations on a 2-storey frame model is adopted to assess the performance of the proposed hybrid method. The illustrated results show that the improved PSONM can provide a reliable tool for accurate SDD in both single and multiple damage cases. Meanwhile, the improved PSO-NM algorithm has a good robustness to noises contaminated in mode shapes. © Springer International Publishing Switzerland 2015.

关键词： Strain energy

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A novel two-step intelligent algorithm for damage detection of beam-like structures

A novel two-step intelligent algorithm for damage detection ...

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International Conference on Natural Computation (ICNC)

作者： Zepeng Chen Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

A novel two-step intelligent algorithm is proposed for structural damage detection (SDD) by combining particle swarm optimization and Nelder-Mead (PSO-NM) algorithm, in which two steps are deployed for exploring a better balance between computational efficiency and accuracy. In the first step, a modal strain energy based index (MSEBI) is defined and used to precisely locate damages of structures. In the second step, structural damage extent is determined by PSO-NM algorithm. Some beam-like structures are adopted to assess its applicability. A parametric study and the effect of measurement noise on the method are also considered. The illustrated numerical simulation results show that the novel method can not only locate structural damage but also identify damage extent of beam-like structures with a good robustness to noises.

关键词： Optimization Shape Algorithm design and analysis Strain Computational efficiency Particle swarm optimization Indexes

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Analysis of adhesively bonded pipe joints under torsion by finite element method

Analysis of adhesively bonded pipe joints under torsion by f...

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2014 Annual Congress on Advanced engineering and Technology, CAET 2014

作者： Wu, J.Y. Yuan, H. Han, J. MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China

ISBN: (纸本)9781138026360

Adhesively bonded pipe are extensively used in pipe system and pipeline failure under torsional loading is one of the most common failure modes. Owing to the complication of theoretical analysis, development of numerical method for optimized design and stress analysis of a strong joint remains a pressing issue. In this paper, a realistic bilinear local bond-slip law is employed for analyzing the behavior of adhesively bonded pipe joints under torsion, based on a parameters study by ANSYS finite element software. Several parameters (i.e. the shear modulus of pipe coupler) are considered for assessing shear stress distribution in the adhesive and load-displacement relationship of the interface. Finally, the factors influencing the interfacial behavior is analyzed. © 2014 Taylor & Francis Group.

关键词： Torsional stress

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Interfacial behavior of pipe joints under torsion loads 7

Interfacial behavior of pipe joints under torsion loads

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7th International Conference on FRP Composites in Civil engineering, CICE 2014

作者： Han, Jun Yuan, Hong Wu, Jiayu MOE Key Lab of Disaster and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou510632 China

ISBN: (纸本)9781771363082

The mechanic behavior and debonding process of pipe joints are the key points for pipe system. Based on the latest research result of pipe joints, the interfacial behavior of pipe joints is studied in this paper. Firstly, through the nonlinear fracture mechanics, the analytical expressions of the interfacial shear stress and the load-displacement relationship at loaded end of pipe joints under torsion loads are obtained. Thus, the shear stress propagation and the debonding progress of the whole interface for different bond lengths could be predicted. Secondly, through the analytical solutions, the influences of different bond length on the load-displacement curve and the ultimate load are studied. The stress transfer mechanism, the interface crack propagation and the ductility behavior of the joints could be explained. On the basis of fully knowing the interfacial behavior of the pipe joints under torsion loads, the full-range characteristic and the crucial factors of interfacial debonding problem can be further understood.

关键词： Torsional stress

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