Effect of column stiffness on braced frame seismic behavior
Effect of column stiffness on braced frame seismic behavior
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DOI：
10.1061/(asce)0733-9445(2004)130:3(381
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发表时间：
2004-03-01
期刊：
影响因子：
--
通讯作者：
Roeder, C
中科院分区：
文献类型：
--
作者：
MacRae, GA;Kimura, Y;Roeder, C
钢结构中心支撑框架一般是通过桁架作用来抵抗侧向力的。因此，这些框架中的柱的设计考虑因素取决于柱的轴力，而柱的弯矩要求通常被忽略。然而，如果柱不能承载弯矩，则动力弹塑性时程分析表明，很可能发生软层机制，仅在一层中造成较大的集中变形。如此大的损伤集中在实际框架中是不常见的，因为柱通常是连续的，它们具有一定的抗弯刚度和强度。基于Pushover分析和动力分析，建立了框架内柱子刚度和位移集中之间的关系。结果表明，结构中连续的地震柱和重力柱显著降低了产生大的漂移集中的可能性。提供了一种确定限制楼层位移集中所需的柱刚度的评估方法和算例。
Steel concentrically braced frames are generally designed to resist lateral force by means of truss action. Design considerations for columns in these frames are therefore governed by the column axial force while column bending moment demands are generally ignored. However, if the columns cannot carry moments, then dynamic inelastic time-history analyses show that a soft-story mechanism is likely to occur causing large concentrated deformations in only one story. Such large concentrations of damage are not generally seen in real frames since columns are generally continuous and they possess some flexural stiffness and strength. This paper develops relationships for column stiffness and drift concentration within a frame based on pushover and dynamic analyses. It is shown that continuous seismic and gravity columns in a structure significantly decrease the possibility of large drift concentrations. An assessment method and example to determine the required column stiffness necessary to limit the concentration of story drift is provided.