首页> 外文会议>Third Diana World Conference, Oct 9-11, 2002, Tokyo, Japan >Invited paper: Modal analysis versus time history analysis concepts for the seismic design
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Invited paper: Modal analysis versus time history analysis concepts for the seismic design

机译:特邀论文:抗震设计的模态分析与时程分析概念

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The forces induced into a structure by earthquake ground motions are prescribed traditionally by elastic response spectra. They can be reduced by behaviour factors to account for the possibility of energy dissipation due to plastic deformations. Presupposition for the utilization of this favourable effect is a sufficient ductility. The consistent definition and verification of this ductility is an essential part of the structural design for earthquakes. In the present paper, the principal features of this task are discussed. In order not to persist in general terms, the governing effects are quantified within a case study of a 3-storey steel frame with composite beams, considering the following steps: Modal analysis, application of behaviour factors, usual assumptions for the required plastic deformations, push over-analysis with plastic rotation of hinges, connection of modal analysis and push over-analysis, nonlinear time history-analysis. Only the last step creates the basis for a reliable assessment of the relevant deformations of the plastifying frame, depending on the applied accelerogram and its peak value PGA.
机译:传统上,由地震地面运动引起的结构力是由弹性响应谱规定的。可以通过行为因素来减小它们,以解决由于塑性变形而导致的能量消散的可能性。利用这种有利效果的前提是足够的延展性。这种延展性的一致定义和验证是地震结构设计的重要组成部分。在本文中,讨论了此任务的主要特征。为了避免普遍存在,在考虑了以下步骤的情况下,在3层带组合梁的钢框架的案例研究中量化了控制效果:模态分析,行为因素的应用,所需塑性变形的通常假设,通过铰链的塑性旋转来进行过推分析,模态分析的连接以及进行过推分析,非线性时程分析。只有最后一步,才能根据所应用的加速度图及其峰值PGA,可靠地评估塑化框架的相关变形。

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