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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。
In order to avoid the collapse of the high-rise building structure caused by the failure of the weak layer, a multi-objective optimization method for seismic performance of the structure based on the floor group damage control function and failure probability is proposed. This method uses the incremental acceleration analysis to select the peak acceleration with structure failure probability of 50% as the target ground motion, and defines two performance indexes of floor group damage control function and failure probability. The optimal analysis of the structure is performed with the component section size as the optimal variable. A 30-story reinforced concrete frame structure was optimized, and the seismic performance of the structure before and after optimization was evaluated based on the PACT (Performance Assessment Calculation Tool) platform. The results show that after optimization, the displacement angle distribution between layers of structure tends to be even and the damage from top to bottom decreases, the collapse reserve coefficient increases by 29.8%, the repair cost of outer frame and core tube is reduced, and the synergy between wall and frame strengthens. The seismic performance of the optimized structure is significantly improved.