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采用非线性时程分析方法,对地震作用下的钢框架进行优化设计。以最小质量、最小地震输入能量、关键杆的最大滞回耗能为设计的优化目标,以层间位移、杆件塑性转角为优化约束。采用多目标遗传算法,从钢结构构件的有效截面中选择最优截面。以某3层抗弯框架为例,说明优化设计方法。结果表明:优化设计可以采用能量设计方法对地震作用下的框架结构进行有效分析。
The nonlinear time-history analysis method is used to optimize the steel frame under earthquake action. With the minimum mass and minimum earthquake input energy, the maximum hysteretic energy of the key bar is the optimal design objective. The layer displacement and the plastic corner of the bar are the optimal constraints. The multi-objective genetic algorithm is used to select the optimal section from the effective sections of steel structure components. Taking a 3-layer bending frame as an example, it illustrates the optimization design method. The results show that the optimal design can effectively analyze the frame structure under earthquake action using energy design method.