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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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Microscale Silicon Origami

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SMALL 2016年第39期12卷 5401-5406页

作者： Song, Zeming Lv, Cheng Liang, Mengbing Sanphuang, Varittha Wu, Kedi Chen, Bin Zhao, Zhi Bai, Jing Wang, Xu Volakis, John L. Wang, Liping He, Ximin Yao, Yu Tongay, Sefaattin Jiang, Hanqing Arizona State Univ Sch Engn Matter Transport & Energy Tempe AZ 85287 USA Arizona State Univ Sch Elect Comp & Energy Engn Tempe AZ 85287 USA Ohio State Univ Dept Elect & Comp Engn Electrosci Lab Columbus OH 43212 USA Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

A new methodology to create 3D origami patterns out of Si nanomembranes using pre-stretched and pre-patterned polydimethylsiloxane substrates is reported. It is shown this approach is able to mimic paper-based origami patterns. The combination of origami-based microscale 3D architectures and stretchable devices will lead to a breakthrough on reconfi gurable systems.

关键词： origami PDMS reconfigurable antenna silicon nanomambranes

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Stability analysis of an ancient landslide considering shear strength reduction behavior of slip zone soil

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LANDSLIDES 2016年第1期13卷 173-181页

作者： Chen, Xiao-ping Zhu, Hong-hu Huang, Jing-wu Liu, Dong Jinan Univ Coll Sci & Engn Key Lab Disaster Forecast & Control Engn Guangzhou Guangdong Peoples R China Nanjing Univ Sch Earth Sci & Engn Nanjing 210008 Jiangsu Peoples R China Guangdong Hydropower Planning & Design Inst Guangzhou Guangdong Peoples R China Shenzhen Comprehens Geotech Engn Invest & Design Shenzhen Peoples R China

In this paper, the stability of an ancient landslide during the first impounding of a nearby reservoir is investigated through the analyses of the shear strength reduction behavior of slip zone soil. In view of the experimental observations, an empirical strain-dependent soil model is established and is then incorporated in finite element analyses. The numerical analysis results show that the failing sections progressively develop due to the soil strength declines from peak toward residual, and the shear zone propagates within the front slope. It is demonstrated in the numerical results that the toe weighting measure has a significant effect on restraining the shear displacements of the soils and preventing the progressive failure of the landslide. The field observations further confirmed the stability condition of the reinforced landslide.

关键词： Slip zone Residual shear strength Landslide Strain-softening Slope stability Finite element analysis

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INTERFACIAL BEHAVIOR OF PIPE JOINTS UNDER TORSION LOADS

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Acta Mechanica Solida Sinica 2015年第5期28卷 521-535页

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

The interfacial behavior of pipe joints is studied in this paper. Firstly, through nonlinear fracture mechanics, the analytical expressions of 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 process of the whole interface for different bond lengths can be predicted. Secondly, through the analytical solutions, the influences of different bond lengths on the load-displacement curve and the ultimate load are studied. The stress trans- fer mechanism, the interface crack propagation and the ductility behavior of the joints can be explained.

关键词： interface failure mechanism softening debonding torsion pipe joints

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A hybrid self-adaptive Firefly-Nelder-Mead algorithm for structural damage detection

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SMART STRUCTURES AND SYSTEMS 2016年第6期17卷 957-980页

作者： Pan, Chu-Dong Yu, Ling Chen, Ze-Peng Luo, Wen-Feng Liu, Huan-Lin Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

Structural damage detection (SDD) is a challenging task in the field of structural health monitoring (SHM). As an exploring attempt to the SDD problem, a hybrid self-adaptive Firefly-Nelder-Mead (SA-FNM) algorithm is proposed for the SDD problem in this study. First of all, the basic principle of firefly algorithm (FA) is introduced. The Nelder-Mead (NM) algorithm is incorporated into FA for improving the local searching ability. A new strategy for exchanging the information in the firefly group is introduced into the SA-FNM for reducing the computation cost. A random walk strategy for the best firefly and a self-adaptive control strategy of three key parameters, such as light absorption, randomization parameter and critical distance, are proposed for preferably balancing the exploitation and exploration ability of the SA-FNM. The computing performance of the SA-FNM is evaluated and compared with the basic FA by three benchmark functions. Secondly, the SDD problem is mathematically converted into a constrained optimization problem, which is then hopefully solved by the SA-FNM algorithm. A multi-step method is proposed for finding the minimum fitness with a big probability. In order to assess the accuracy and the feasibility of the proposed method, a two-storey rigid frame structure without considering the finite element model (FEM) error and a steel beam with considering the model error are taken examples for numerical simulations. Finally, a series of experimental studies on damage detection of a steel beam with four damage patterns are performed in laboratory. The illustrated results show that the proposed method can accurately identify the structural damage. Some valuable conclusions are made and related issues are discussed as well.

关键词： structural damage detection (SDD) firefly algorithm Nelder-Mead algorithm self-adaptive finite element model (FEM)

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Elastic-plastic analysis of surrounding rock in deep roadway considering shear dilatancy property under non-uniform stress field

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Journal of engineering Science and Technology Review 2017年第4期10卷 16-24页

作者： Chuan-Ming, Li Wen-Bao, Shi Wan-Rong, Liu Rui-Min, Feng School of Resource and safety Engineering Anhui University of Science and Technology Huainan Anhui232001 China Anhui Province Key Lab. of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and Technology Huainan Anhui232001 China School of Physics Science and Information Engineering Liaocheng University Liaocheng Shandong252059 China Department of Mining and Mineral Resources Engineering Southern Illinois University CarbondaleIL62901 United States

The surrounding rock of deep engineering roadway is under the complicated mechanical environment of non-uniform stress distribution, and the stress mechanical model of uniform distribution is obviously different from the surrounding rock of roadway in real stress state. Thus, accurately evaluating the stress and deformation state of surrounding rock is infeasible in non-uniform stress field when employing the mechanical model developed for uniform stress conditions. To reflect the real mechanical state of the roadway surrounding rock accurately and calculate the radius of the plastic zone in roadway surrounding rock precisely, a mechanical model of roadway surrounding rock under non-uniform stress conditions was established in this study based on unified strength theory. One floor roadway of 1231 (1) working face in Panyi coal mine of Huainan coal field was considered as an example. The influences of side pressure coefficient and intermediate principal stress on the scope of the plastic zone in surrounding rock were analyzed. The effect of shear dilatancy property on the deformation and failure process of surrounding rock was discussed, and the field monitoring and verification of the scope of the plastic zone in surrounding rock were conducted on the floor roadways of 1231 (1) and 1252 (1) working face in this mine. Research results indicate that the displacement of the plastic zone enlarges by nearly thrice while the side pressure coefficient increases, and the radius of the plastic zone in roadway surrounding rock in the vertical direction is obviously larger than that in the horizontal direction, which reflects an anisotropic characteristic of the surrounding rock of deep roadway. The displacement of the plastic zone in the surrounding rock enlarges by at least 60% while the shear dilatancy parameter increases, but the morphological change of the plastic zone is minor. Furthermore, the displacement of the plastic zone in the surrounding rock reduces by nearly 35

关键词： Floors

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The Composite Ground Finite Layer Method and its Application to Pile Foundation Analysis

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LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES 2016年第13期13卷 2393-2413页

作者： Tian, Guan Feng Tang, Lian Sheng Ma, Hong Wei Wu, Qi Xing Jinan Univ Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Sun Yat Sen Univ Sch Earth Sci & Geol Engn Guangzhou 510275 Guangdong Peoples R China

To study the influence of a foundation structure on the ground, the finite layer method of composite ground is derived based on the finite layer method (FLM) theory of the semi-analytic numerical method and the force method principle of elastic material, which is used to analyze a layered ground including multiple internal constraint planes. By simplifying a pile body as a solid constraint composed of four side plane constraints, the composite ground FLM is applied to solve the displacement and stress field of the ground. The change of the ground displacement and stress caused by the addition of a single pile constraint are then discussed, and the influence rules of a pile position on the ground displacement are also determined. Finally, the necessity, rationality and validity of the composite ground FLM are demonstrated by the model test examples of a single pile and pile raft foundation.

关键词： Composite ground FLM Force method principle Internal constraint plane Pile foundation

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Research on law of gas dynamic disasters and geological structure in Majiagou mine 4

Research on law of gas dynamic disasters and geological stru...

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4th Academic Conference of Geology Resource Management and Sustainable Development

作者： Qi, Li-Ming Zhang, Xu-Kun Zhao, Rong Key Lab of Mine Disaster Prevention and Control in Hebei Province Langfang Hebei065201 China School of Safety Engineering North China Institute of Science and Technology Beijing101601 China Graduate School North China Institute of Science and Technology Beijing101601 China

ISBN: (纸本)9781921712494

Gas dynamic disaster is a serious threat to the mine safety production. First of all, we analyzed data about mine gas dynamic disasters over the years and obtained gas dynamic distribution of disaster. Then, we draw horizontal geological structure maps of Majiagou mine (including 12 coal seams and 9-2 coal seams), at the same time we summed up the law of distribution. Geological formation is the most serious disaster area in gas dynamic, we should give adequate attention to gas power disaster prevention in Majiagou mine according to the research result.

关键词： Coal deposits

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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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