A Seismic Design Lateral Force Distribution Based on Inelastic State of Structures
A Seismic Design Lateral Force Distribution Based on Inelastic State of Structures
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DOI：
10.1193/1.2753549
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发表时间：
2007-08
影响因子：
5
通讯作者：
S. Chao;S. Goel;Soon-Sik Lee
中科院分区：
文献类型：
--
作者：
S. Chao;S. Goel;Soon-Sik Lee
众所周知，按照现行规范设计的结构在大地震期间会经历较大的非弹性变形。然而，抗震设计规范中给出的侧向力分布通常基于弹性响应研究的结果。本文回顾了当前抗震规范中使用的侧向力分布，并介绍和讨论了许多示例结构的非线性动力分析所获得的结果。结论是，规范侧向力分布并不代表非线性响应期间可能引起的最大力分布，这可能导致变形和力需求的不准确预测，导致结构以相当不可预测和不期望的方式运行。通过使用遭受各种地震地面运动的示例结构的最大层剪力的相对分布，开发了一种基于非弹性行为研究的新侧向力分布。结果表明，建议的侧向力分布，特别是对于本研究中研究的框架结构类型，更加合理，并且可以更好地预测全局和单元层面的非弹性地震需求。
It is well recognized that structures designed by current codes undergo large inelastic deformations during major earthquakes. However, lateral force distributions given in the seismic design codes are typically based on results of elastic-response studies. In this paper, lateral force distributions used in the current seismic codes are reviewed and the results obtained from nonlinear dynamic analyses of a number of example structures are presented and discussed. It is concluded that code lateral force distributions do not represent the maximum force distributions that may be induced during nonlinear response, which may lead to inaccurate predictions of deformation and force demands, causing structures to behave in a rather unpredictable and undesirable manner. A new lateral force distribution based on study of inelastic behavior is developed by using relative distribution of maximum story shears of the example structures subjected to a wide variety of earthquake ground motions. The results show that the suggested lateral force distribution, especially for the types of framed structures investigated in this study, is more rational and gives a much better prediction of inelastic seismic demands at global as well as at element levels.