近断层地震动作用下隔震结构的优化设计

首先讨论了近断层脉冲型地震动的特点,并以台湾集集地震实际脉冲型近震记录为地震动输入,应用含潜在约束策略的序列二次规划算法,对安装铅芯橡胶隔震支座的钢筋混凝土框架隔震结构的隔震器参数和上部结构构件截面几何尺寸进行一体化优化设计,然后输入E l Centro(1940)、Taft(1952)地震波对优化后的隔震结构进行地震反应分析。计算结果表明,对考虑脉冲型近断层地震动作用的隔震结构进行参数优化设计后,该隔震结构能同时满足脉冲型和普通非脉冲型近震作用的结构设计需求。

Optimum design of base-isolated structure subjected to near-fault ground motions

In the present paper,the characteristics of near-fault pulse-like ground motions are discussed firstly.Secondly,the near-fault pulse-like earthquake record from the Taiwan Chi-Chi Earthquake (1999,9,21) is taken as the input of ground motions,and by using the sequential quadratic programming algorithm with the potential constraints strategy the integrated optimum design of a multi-story RC base-isolated frame structure with lead-core rubber bearings is conducted,in which the structural member sizes and the parameters of isolation devices are optimized simultaneously.Finally, the earthquake response of the optimal base-isolated structure is analyzed subjected to the El Centro(1940) and Taft(1952) earthquake.It is concluded from the numerical results that through the parametric optimum design of base-isolated building subjected to the pulse-like near-fault earthquake,the optimal structure can satisfy simultaneously the structural design requirement under both the pulse-like near-fault ground motions and the general non-pulse-like ones.