基于性能设计方法在超限高层抗连续倒塌设计应用

Application of performance-based design method in over high-rise building progressive collapse prevention

我国抗震设计规范提出"小震不坏、中震可修、大震不倒"的设防目标,其中,"中震可修、大震不倒"的第二、第三水准设防目标,主要是采用经验调整系数及构造加强措施来实现,缺乏定量的计算分析。本文应用基于性能抗震设计的方法,采用静力非线性有限元倒塌计算原理,分析框架结构在大震作用下的破坏机理,对结构"大震不倒"进行定量分析,确保结构实现抗倒塌的设计目标。并结合一个超限高层实例,验证倒塌计算结果与振动台实验结果的相符性。

The three-level performance objective is put forward in national code for seismic design of buildings,that is,the criterion of no damage under frequent earthquake,repairable damage under moderate earthquake,no collapse under severe earthquake,but the objective is guaranteed mainly by the empirical adjustive coefficient and strengthening of construction details.The second level and third level performance objectives,that is,repairable damage under moderate earthquake and no collapse under severe earthquake,lack the quantitative analysis.The analysis of structure under moderate earthquake is carried out by the performance-based seismic design method,and the mechanism of structure under severe earthquake is conducted by static nonlinear analysis of progressive collapse,to guarantee no collapse under severe earthquake and the design objectivity of progressive collapse prevention.A calculation of a over high-rise building is given.Simulated results are in good agreement with experiments.