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结构在远场地震作用下的损伤与地震动的循环效应密切相关,基于标准化滞回耗能谱、累积延性比谱,提出了人字形中心支撑钢框架基于能量的性态设计方法。该方法给出了各构件累积滞回耗能的计算公式及各构件截面的设计方法。采用该方法设计了一个10层人字形中心支撑钢框架,选取了15条远场地震记录,采用Pushover分析方法和非线性时程分析方法对设计结构的抗震性能进行了评估。分析结果表明:结构在罕遇地震下出现了理想的屈服机构;在多遇地震和罕遇地震下,结构层间侧移角均满足建筑抗震设计规范的要求;结构层间变形比较均匀,各层累积滞回耗能分布比较平均,证明了所提出设计方法的可靠性。
The damage of the structure under the action of far-field earthquake is closely related to the cyclic effect of ground motions. Based on the normalized hysteresis energy dissipation spectrum and the cumulative ductility ratio spectrum, a energy-based attitude design method of steel frame with chevron center is proposed. The method gives the calculation formula of cumulative hysteresis energy dissipation of each component and the design method of each component section. A 10-layer chevron-centered steel frame was designed by this method. Fifteen far-field seismic records were selected. Pushover analysis and nonlinear time-history analysis were used to evaluate the seismic performance of the designed structure. The results show that the structure has an ideal yielding mechanism under rare earthquakes, and the lateral displacement angle of the structural layers meets the requirements of the code for aseismic design of buildings in the case of frequent earthquakes and rare earthquakes. The deformation between structural layers is more uniform, The cumulative energy dissipation of stratified hysteresis is relatively uniform, which proves the reliability of the proposed design method.