Abstract Numerical analyses using the finite element software Opensees are conducted to examine the ultimate seismic behavior of Wide-Flange steel columns used in multi-story steel frames. An OpenSees fatigue model was adopted to consider the effect of local buckling and cyclic strength degradation. The numerical model is validated with the experimental results from seven full-scale column specimens tested by the authors in an earlier study utilizing the Multiple Usage Structural Testing System (MUST). The comparisons of results include hysteretic behavior which is obtained through three cyclic tests on steel columns with two different axial load levels, and time history behaviors of four additional columns tested by pseudo-dynamic hybrid simulation with both horizontal and vertical seismic excitations. A series of parametric studies on axial load, height or width to thickness ratio of web and flange, aspect ratio of cross section, and section forms are also carried out.

中文翻译：

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复杂地震荷载作用下全尺寸钢柱的数值研究

摘要 利用有限元软件Opensees 进行数值分析，研究多层钢框架中使用的宽翼缘钢柱的极限抗震性能。采用 OpenSees 疲劳模型来考虑局部屈曲和循环强度退化的影响。该数值模型通过作者在早期研究中使用多用途结构测试系统 (MUST) 测试的七个全尺寸柱试样的实验结果进行了验证。结果的比较包括通过对具有两种不同轴向载荷水平的钢柱进行三个循环试验获得的滞后行为，以及通过水平和垂直地震激发的拟动力混合模拟测试的四个附加柱的时程行为。一系列关于轴向载荷的参数研究，