基础隔震结构的系统参数优化设计  

Parameter Optimization of Base-Isolated Structure

作　　者：张延年[1] 范鹤[2] 董锦坤[3] 朱朝艳[3] 李艺[2] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110015 [2]东北大学资源与土木工程学院,辽宁沈阳110004 [3]辽宁工学院土木建筑系,辽宁锦州121001

出　　处：《沈阳建筑大学学报（自然科学版）》2006年第4期529-533,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金资助(50508008);辽宁省教育厅高等学校科研项目(2005343);建设部研究开发项目(06-K1-22)

摘　　要：目的为了改善基础隔震结构的减震效果,实现基础隔震结构设计的可靠性和有效性,得到基础隔震结构的系统优化参数.方法建立了基础隔震结构的动力分析模型,推导出其运动微分方程;对标准遗传算法经常出现未成熟收敛、振荡、随机性太大和迭代过程缓慢等缺点进行改善,提出了改进混合遗传算法;建立基础隔震结构系统参数优化设计模型,使用改进混合遗传算法对7层LRB隔震结构的系统参数进行优化设计.结果优化后,LRB隔震结构的相对加速度峰值、相对速度峰值、相对位移峰值和层间剪力峰值分别比优化前有不同程度的降低.结论工程实例计算结果表明改进混合遗传算法对基础隔震结构的系统参数优化效果比较理想,基础隔震结构的各项地震反应均得到了更好地控制.In order to improve the effect of shock absorption of base- isolated structure with LRB, optimal parameters are found. The dynamic analysis model for base - isolated structure with LRB is set up, and kinetic differential function is presented accordingly. Considering that the standard genetic algorithm （SGA） has such frequent shortcomings as premature convergence, oscillation and over - randomization in iterative process, a new genetic operator named transgenic operator has been developed for the purpose of improving SGA. Moreover, a fibonacci algorithm （FA） for structural optimization with discrete variables is proposed, and some problems are solved by means of FA combined with IGA. Thus, improved hybrid genetic algorithm （IHGA） is proposed. The optimal model for base - isolated structure with LRB is set up. The parameters of base-isolated structure with LRB are optimized with IHGA. The relative acceleration, velocity, displacement and interstory shear of structure with LRB are reduced greatly by optimization. It shows that IHGA is an effective method for parameter optimization of base - isolated structure. The various earthquake responses of base - isolated structure with LRB get better control after it is optimized with IHGA.

关 键 词：结构振动控制 LRB隔震结构 结构优化 改进遗传算法 混合遗传算法 

分 类 号：TU311.3[建筑科学—结构工程]