基于等损伤的钢框架结构抗震性能优化  

ASEISMIC PERFORMANCE OPTIMIZATION OF STEEL FRAME STRUCTURES BASED ON UNIFORM DAMAGE CONCEPT

作　　者：白久林[1] 杨乐[1,2] 欧进萍[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《工程力学》2015年第6期76-83,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51261120376);教育部博士研究生学术新人奖资助项目(2012)

摘　　要：等损伤设计是指在地震作用下结构所有构件(楼层)发生同等程度的损伤而形成均匀的侧向变形,使所有结构构件的性能均能充分发挥。该文采用优化准则法发展了基于Open Sees平台的钢框架结构等损伤抗震设计方法。通过提取结构在强震下的构件损伤指数来获得损伤指数比列阵,进而定量地对损伤严重部位进行加强、对损伤较轻部位进行削弱;基于材料总造价恒定和体系约束条件,对所有构件进行重新调整。以一个8层钢框架结构作为原始结构,采用规范反应谱拟合的一条人工地震动作为输入,探讨了不同超松弛因子对优化结果的影响;通过大样本时程分析,对比了结构优化前后的层间位移角分布、整体损伤指标、楼层损伤分布和整体抗震能力,结果表明该文的优化方法能有效的提高结构的抗震能力。Uniform damage-based aseismic design implies that structures will develop an identical member/story damage and uniform story drift under severe earthquakes, which can fully exploit the material capacity. In the present study, a uniform damage-based aseismic design approach for steel frame structures is proposed using an optimization criterion method, based on Open Sees platform. The array of damage index ratio will be formed by calculating the member damage index, and the components with severe damage will be strengthened while the parts with low damage will be reduced quantificationally. Based on the constraints of constant material cost and system requirements, the member sections are adjusted. Using an 8-story steel frame structure as a prototype structure and a synthetic ground motion matching the code response spectrum as input, the effects of different convergence parameters on the final structural member sections are discussed. According to multiple time history analyses, the distribution of interstory drift ratio, global damage index, story damage distribution and global aseismic capacity are compared, and the results show that the proposed optimization approach can enhance the aseismic capacity effectively.

关 键 词：等损伤 优化准则法 钢框架结构 抗震性能 人工地震动 

分 类 号：TU352.11[建筑科学—结构工程] TU391