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本文分别采用二进制的对称分组和自由分组两种编码方法,基于改进的遗传算法(MGA)和有限元分析软件SAP2000API接口开发了一种面向偏心结构中阻尼器快速优化布置的平台,推导了拟合中国规范标准反应谱生成人工地震动记录的方法,提出了两种为抑制偏心结构扭转效应而设计的评价函数。首先,与穷举法结果比较,通过逐步积分法,验证了该优化平台对于L型偏心结构中,给定数目软钢阻尼器位置优化结果的可靠性和高效性;然后,引入两个性能评价指标,通过数值分析,研究了影响偏心结构中阻尼器位置优化的不同因素。结果表明:评价函数的设计和编码方法对阻尼器优化影响较大,场地地震动输入会影响阻尼器的位置优化与编码方法的选择相关,同一编码,影响不大;力学参数的改变不影响阻尼器的位置分布,但软钢阻尼器初始刚度的提高会降低中上部楼层的减震效果。本文研究方法可为同类结构中阻尼器快速优化布置提供借鉴。
In this paper, we use binary symmetric grouping and free grouping respectively. Based on the improved genetic algorithm (MGA) and finite element analysis software SAP2000API interface, a platform for rapid optimization of dampers in eccentric structures is developed. Chinese standard response spectrum to generate artificial ground motion recording method, two evaluation functions designed to suppress the torsional effect of eccentric structure are proposed. First of all, compared with the result of exhaustive method, the method of step by step integration is used to verify the reliability and efficiency of the optimization platform for the given number of mild steel damper position optimization results in L-shaped eccentric structure. Then, two performance evaluation Through numerical analysis, the different factors that affect the damper position optimization in eccentric structure are studied. The results show that the design and coding method of evaluation function have a great influence on the damper optimization. The location optimization of dampers affected by ground motion input is related to the choice of coding method, and the same code has little effect. The change of mechanical parameters does not affect the damping However, the increase of the initial stiffness of the mild steel damper will reduce the damping effect of the middle and upper floors. The research method in this paper can provide reference for the rapid optimization of dampers in similar structures.