基于构件重要性指标的RC框架结构抗震优化设计研究

通过引入基于结构广义刚度的构件重要性指标，提出了考虑构件重要程度差异的RC框架结构抗震优化设计方法。根据“构件重要性越大，承载力储备也越大”的结构系统设计策略，以构件的重要性程度由小到大逐渐发生损伤破坏的破坏模式为目标，根据现有一般构件的安全储备取值，建议了基于构件重要性指标的安全储备表达式。以广义结构刚度损失率作为结构失效判定依据，通过一RC框架结构抗震设计算例，分别对采用基于构件重要性指标方法和现行规范方法设计的结果进行对比，结果表明，建议方法的设计结果，其配筋分布更加合理，抗震性能得到显著改善，且总用钢量略有降低。

Study on optimization of seismic design for RC frames based on member importance index

A member importance index based on the generalized structural stiffness was introduced to optimize the seismic design of RC frames.The formula used to determine the capacity margin of structural members was proposed according to the system design strategy that the more important member should have larger capacity margin.The design strategy was aiming to realize the member damage sequence from less important members to the important ones.Based on the current safety margin value for ordinary members,the safety margin was suggested for members with different important indices.The proposed seismic design method and the conventional method of the current design code were compared through a case study of a RC frame.The results show that the proposed method significantly improves the seismic performance and slightly reduce the amount of steel reinforcement.