Nonlinear Interstory Drift Contours for Idealized Forward Directivity Pulses Using “Modified Fish-Bone” Models
Nonlinear Interstory Drift Contours for Idealized Forward Directivity Pulses Using “Modified Fish-Bone” Models
复制标题
使用“改进的鱼骨”模型实现理想化前向脉冲的非线性层间漂移轮廓
DOI：
10.1260/1369-4332.18.5.603
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发表时间：
2015
影响因子：
2.6
通讯作者：
H. H. Jamnani
中科院分区：
文献类型：
--
作者：
Alireza Khaloo;Horr Khosravi;H. H. Jamnani
4个5层、10层、20层和30层的弯矩框架，分别代表低层、中层和两层高层结构，受到大量理想化的方向性脉冲。脉冲的幅度和周期分别从0.02克到1.0克和0.5秒到12秒不等。对1400多个低高层弯矩框架进行了非线性动力分析，采用改进的鱼骨模型是可行的。研究了层间位移沿高度的分布规律，提出了两条应用等高线：(I)最大层间位移等值线和(Ii)临界层间等值线。给出了结构固有周期与脉冲周期之比和响应修正系数(R因子)的关系曲线。因此，等高线可以提供根据这些参数调查损害的测量、其位置以及导致坍塌的条件的可能性。这些研究证明了灵活建筑相对于长周期指向性脉冲的脆弱性。它们还表明，一些近断层的方向性脉冲可能会对低层建筑造成严重破坏。
Four 5-, 10-, 20- and 30-story moment frames, representing low-, mid-, and two high-rise structures, were subjected to a great number of idealized directivity pulses. The amplitudes and periods of pulses vary from 0.02 g to 1.0 g and 0.5 to 12 sec, respectively. Over 1400 nonlinear dynamic analyses of low- to high-rise moment frames were performed which were feasible through using modified fish-bone model. The distribution of interstory drift along the height was studied and two applied contours were proposed: (i) the maximum interstory drift contour, and (ii) the critical story contour. These contours were demonstrated versus the ratio of natural period of the structure to the pulse period and the response modification coefficient (R-factor). Hence, the contours could provide the possibility of investigating the measure of damage, its location and also the conditions leading to collapse based on these parameters. These investigations justify the vulnerability of flexible buildings versus long-period directivity pulses. They also show that some near-fault directivity pulses could impose serious damage to low-rise buildings.