Effects of Near-Fault Earthquakes on the Seismic Performance of Steel-Frame Buildings with Vertical Mass Irregularities

Hossein Abdollahiparsaa
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Abstract

This study explores the effects of vertical mass irregularities on the seismic response of multistoried moment-resisting steel structures by considering mass discontinuity at the top and first stories. Perform 3D software is used to carry out an inelastic dynamic analysis of time histories of 3-, 5-, and 8-storey steel frame buildings subjected to 10 near-field earthquake events. Comparison of the analytical results reveals that the axial forces on both the interior and exterior columns in all cases are at their maxima (30%-40%) in the top storey and at their minima in the 1st storey, respectively. Structures with mass irregularities in their top stories are observed to experience slightly larger horizontal roof displacements than those with irregularities in their 1st storey. Larger vertical displacements at beam mid-points are observed in structures with mass irregularities in their top stories than in those with irregularities in their 1st storey while the base shear forces are found to decrease by about 6%. Compared to structures with mass irregularities in their lower stories, those with vertical irregularities in their top stories exhibit a poorer performance under near-field earthquakes.
近断层地震对竖向质量不规则钢框架结构抗震性能的影响
本文研究了竖向质量不规则性对多层抗弯矩钢结构地震反应的影响,考虑了顶部和底层的质量不连续。利用Perform 3D软件对3层、5层和8层钢框架建筑在10次近场地震作用下的时程进行了非弹性动力分析。分析结果对比表明,在所有情况下,内外柱的轴力分别在顶层达到最大值(30%-40%),在第一层达到最小值。顶层质量不规则的结构比第一层质量不规则的结构的水平屋顶位移略大。在顶层质量不规则的结构中,梁中点的垂直位移比第一层质量不规则的结构大,而基础剪力减少了约6%。与底层质量不规则的结构相比,顶层垂直不规则的结构在近场地震下表现出较差的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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