【摘要】 总结了国内外非线性反应谱的发展历程及现状,介绍了形状记忆合金(SMA)材料及其自复位体系的应用技术,简要回顾了非线性反应谱分析的基本理论。通过遗传算法选取典型的地震动记录,针对SMA自复位体系特殊的旗形滞回曲线,设计合理的分析工况,通过大量数值模拟分析得到非线性反应的精确结果。在此基础上采用最小二乘法回归得到旗形非线性设计反应谱模型参数,最后将模型计算曲线与精确解进行比较,二者吻合程度较好,表明回归的模型较为可靠,可为具有相似滞回特性自复位结构的非线性设计提供帮助。更多还原

【Abstract】 In this paper,the research status of nonlinear seismic response spectrum is summarized first. The SMA material and selfcentering system based on this material are introduced,and the basic theory of nonlinear spectrum is reviewed. The typical earthquake records are selected using genetic algorithm,and the analysis conditions are designed according to characters of hysteretic loop of SMA self-centering system. Then the accurate nonlinear seismic responses of SMA self-centering system are calculated using numerical simulation method. Based on the simulation results,the model parameters of nonlinear response spectrum for flag hysteretic loop are regressed by least square method. At last,the calculated curves from regressed model are compared with the accurate nonlinear seismic responses,and the results prove that the regressed model has enough accuracy for the nonlinear design of self-centering system with flag shape hysteretic loop.更多还原