Displacement based seismic verification method for thin-walled circular steel columns subjected to bi-directional cyclic loading
Displacement based seismic verification method for thin-walled circular steel columns subjected to bi-directional cyclic loading
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DOI：
10.1016/j.engstruct.2009.07.025
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发表时间：
2009-11
影响因子：
5.5
通讯作者：
N. Kulkarni;A. Kasai;H. Tsuboi
中科院分区：
文献类型：
--
作者：
N. Kulkarni;A. Kasai;H. Tsuboi
本工作评估双向循环荷载对薄壁圆形钢柱有限元（FE）模型的影响，特别是日本公路桥梁的首选。内部开发的材料本构关系用于有限元模型的材料特性，以了解钢在非弹性循环荷载下的行为。在此基础上，提出了强度和延性的经验公式。利用单向和双向荷载的极限延性与柱在双向地震作用下的位移响应特性之间的关系，提出了双向地震验算方法。在不同的情况下，极限位移和极限应变的发生之间的比较，研究表明，基于位移的抗震验证方法给出了稍微超过设计的钢柱。
The present work evaluates influence of bi-directional cyclic loading on Finite Element (FE) models of thin-walled circular steel columns, especially preferred for highway bridges in Japan. An in-house developed material constitutive law is used for the material properties of FE model to understand the behavior of steel under inelastic cyclic loading. The empirical formulas for strength and ductility are developed based on the observations. Attempts are also made to develop a bi-directional seismic verification method by using relation between ultimate ductility of uni- and bi-directional loading, and characteristics of displacement response of the column under two-directional earthquake motions. The comparison between occurrences of ultimate displacement and ultimate strain, in different cases studied, indicates that displacement based seismic verification approach gives slightly over design of the steel column.