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Time-domain Spectral Finite element Method for Wave Propagation Analysis in Structures with Breathing Cracks

Acta Mechanica Solida Sinica 2020年第6期33卷 812-822页

作者： Zexing Yu Chao Xu Fei Du Shancheng Cao Liaiigxian Gu School of Astronautics Northwestern Polytechnic UniversityXVan 710072China

Guided waves are generally considered as a powerful approach for crack detection in structures,which are commonly investigated using the finite element method(FEM).However,the traditional FEM has many disadvantages in solving wave propagation due to the strict requirement of mesh *** tackle this issue,this paper proposes an efficient time-domain spectral finite element method(SFEM)to analyze wave propagation in cracked structures,in which the breathing crack is modeled by definiiig the spectral gap ***,novel orthogonal polynomials and Gauss-Lobatto-Legendre quadrature rules are adopted to construct the spectral ***,a separable hard contact is utilized to simulate the breathing ***,a comparison of the numerical results between the FEM and the SFEM is conducted to demonstrate the high efficiency and accuracy of the proposed *** on the developed SFEM,the nonlinear features of waves and influence of the incident mode are also studied in detail,which provides a helpful guide for a physical understanding of the wave propagation behavior in structures with breathing cracks.

关键词： Time-domain spectral finite element method Contact nonlinearity gap element Breathing crack

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Elastic and Inelastic Response of Structural Systems in Seismic Pounding

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Open Journal of Civil Engineering 2016年第1期6卷 50-73页

作者： N. U. Mate S. V. Bakre O. R. Jaiswal K. K. Sayyad Civil Engineering Department Amrutvahini College of Engineering Sangamner India Department of Applied Mechanics Visvesvaraya National Institute of Technology (VNIT) Nagpur India

The present paper addresses the comparative study of three adjacent single-degree-of freedom structures for elastic and inelastic system with and without pounding under seismic excitations. For the gap between three adjacent structures, the simulation is done by using linear spring element without damping. The entire numerical simulation is done in time domain by considering the inputs of four real ground motions. The results of the study show that the response of elastic system is much different to that of response of inelastic system in the absence and presence of pounding, especially in lighter or more flexible structures. Elastic structures show much severe pounding response than inelastic structures. Modeling of colliding structures behaving inelastically is really needed in order to obtain the accurate structural pounding involved response under seismic excitation.

关键词： Seismic Pounding gap element MDOF Elastic and Inelastic Stick System Time History Analysis Spectral Acceleration Response

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