Simplified Derivation of a Damage Curve for Seismically Induced Beam Fractures in Steel Moment-Resisting Frames
Simplified Derivation of a Damage Curve for Seismically Induced Beam Fractures in Steel Moment-Resisting Frames
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DOI：
10.1061/(asce)st.1943-541x.0001473
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Xiaohua Li;M. Kurata;M. Nakashima
中科院分区：
文献类型：
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作者：
Xiaohua Li;M. Kurata;M. Nakashima
本文提出了一种新的损伤曲线的简化推导方法，用以量化钢框架梁在地震作用下断裂的损伤程度。损伤曲线将损伤指数表示为断裂截面弯曲刚度降低的函数，其中损伤指数是通过比较地震前后钢梁在环境振动下测得的应变响应而获得的。通过对两层两跨框架模型进行参数分析，建立了损伤曲线的封闭表达式，分析了损伤曲线与各种结构参数之间的关系。从参数分析中值得注意的是，损伤曲线主要受被监测梁的跨高比影响。由此证明，该封闭表达式适用于普通多层多跨钢框架结构的损伤曲线的构建。封闭式表达式的有效性。
AbstractThis paper presents a simplified method of deriving a novel damage curve to quantify the damage extent of seismically induced beam fractures in steel moment-resisting frames. The damage curve expresses a damage index as a function of reduction in bending stiffness at the fractured section, where the damage index is obtained by comparing strain responses measured on steel beams under ambient vibrations before and after earthquakes. A closed-form expression of the damage curve was formulated from a two-story two-bay frame model based on a parametric analysis conducted to examine relationships between the damage curve and various structural parameters. The notable finding from the parametric analysis was that the damage curve was primarily affected by the span-depth ratio of the monitored beam. Thus, the closed-form expression was demonstrated to be applicable to the construction of damage curves for common multi-story multi-bay steel moment-resisting frames. The effectiveness of the closed-form expr...