基于损伤控制函数与失效概率的结构抗震性能多目标优化与评估  

DAMAGE CONTROL FUNCTION AND FAILURE PROBABILITY BASED STRUCTURAL SEISMIC PERFORMANCE MULTI-OBJECTIVE OPTIMIZATION AND ASSESSMENT

作　　者：徐龙河[1] 于绍静 卢啸[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程力学》2017年第10期61-67,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51322806;51578058;51408034);中央高校基本科研业务费项目(2014JBZ011)

摘　　要：为避免高层建筑结构由于薄弱层破坏而引起整体倒塌,该文提出基于楼层组损伤控制函数与失效概率的结构抗震性能多目标优化方法。该方法通过增量动力分析选择结构失效概率达到50%的峰值加速度为目标地震动,定义楼层组损伤控制函数及失效概率两个性能指标,以构件截面尺寸为优化变量对结构进行优化分析。对一30层钢筋混凝土框筒结构进行优化,并基于PACT(Performance Assessment Calculation Tool)平台对优化前后结构的抗震性能进行评估。结果表明,优化后结构各层层间位移角分布趋于均匀且自上而下损伤逐渐减小,倒塌储备系数增加29.8%;外框架与核心筒修复费用均降低,墙与框架协同作用加强,优化后结构的抗震性能显著提高。To avoid global collapse of high-rise building structures caused by the damage of weak stories, a multi-objective optimization method based on damage control function of story group and failure probability was proposed. Through incremental dynamic analysis, the peak acceleration corresponding to the structural failure probability of 50% was selected as the objective earthquake intensity, and two performance indices： the damage control function of story group and failure probability, were defined and the section dimension of components was used as the variables to conduct the structural optimization analysis. A 30-story reinforced concrete frame-core structure was optimized, and the seismic performance of structure before and after optimization was assessed based on PACT（Performance Assessment Calculation Tool）. Results indicate that the inter-story drift angle distribution of the optimized structure is more uniform than that of the original structure, and the damage is gradually decreased from the top to the bottom. The Collapse Margin Ratio（CMR） is increased by 29.8, and the repair cost is reduced for both the frame and core tube. The working coordination between the wall and the frame is strengthened, and the seismic perfomance of the structure after optimization has been significantly improved.

关 键 词：钢筋混凝土框筒结构 抗震性能 损伤控制函数 失效概率 修复费用 

分 类 号：TU352.11[建筑科学—结构工程]