| Comparison between the seismic response of 2D and 3D models of rigid blocks |
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| 作者姓名： | Angelo Di Egidio Daniele Zulli and Alessandro Contento |
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| 基金项目： | partially funded by FY 2009-2010 PRIN–Italian Ministry for Research |
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| 摘 要： | A three-dimensional rigid body on the shape of a parallelepiped is modelled in order to rock on a side or a vertex of the base,in order to evaluate the seismic response of rigid blocks lying on a horizontal support.The center of mass of the body is considered as eccentric with respect to its geometric center.As seismic input,three Italian recorded accelerograms,with different spectral content,are used.The study is mainly conducted to highlight the differences between the seismic response of 2D and 3D models of rigid blocks,with the aim to understand if,in some cases,the use of the 3D model of rigid block is required to obtain safer results.In fact,the outcomes show that in some ranges of the geometrical and mechanical parameters that characterize the excitation and the body,a two-dimensional model,which is not able to consider the 3D rocking on a vertex,can provide unsafe results.In particular,it is found that the overturning process of the three-dimensional block can occur under excitations which are lower than those which overturn a corresponding two-dimensional block.
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| 关 键 词： | seismic excitation 3D rigid block rectangular base rocking overturning |
Seismic performance of an existing bridge with scoured caisson foundation |
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| Angelo Di Egidio,Daniele Zulli and Alessandro Contento.Comparison between the seismic response of 2D and 3D models of rigid blocks[J].Earthquake Engineering and Engineering Vibration,2014,13(1):151-162. |
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| Authors: | Kuo-Chun Chang Yu-Chi Sung Kuang-Yen Liu Ping-Hsiung Wang Zheng-Kuan Lee Lu-Sheng Lee Witarto |
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| Institution: | 1. Department of Civil Engineering, Architecture and Environment (DICEAA), University of L’Aquila, L’Aquila, 67100, Italy
2. Deptartment of Civil Engineering, Architecture and Environment (DICEAA), University of L’Aquila, Via Giovanni Gronchi 18, L’Aquila, 67100, Italy
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| Abstract: | A three-dimensional rigid body on the shape of a parallelepiped is modelled in order to rock on a side or a vertex of the base, in order to evaluate the seismic response of rigid blocks lying on a horizontal support. The center of mass of the body is considered as eccentric with respect to its geometric center. As seismic input, three Italian recorded accelerograms, with different spectral content, are used. The study is mainly conducted to highlight the differences between the seismic response of 2D and 3D models of rigid blocks, with the aim to understand if, in some cases, the use of the 3D model of rigid block is required to obtain safer results. In fact, the outcomes show that in some ranges of the geometrical and mechanical parameters that characterize the excitation and the body, a two-dimensional model, which is not able to consider the 3D rocking on a vertex, can provide unsafe results. In particular, it is found that the overturning process of the three-dimensional block can occur under excitations which are lower than those which overturn a corresponding two-dimensional block. |
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| Keywords: | seismic excitation D rigid block rectangular base rocking overturning |
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