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对抗震设防水平不高、抗震构造措施设置不足且已经服役多年的低延性钢筋混凝土框架结构抗震性能的主要影响因素进行总结,在此基础上从构件层面逐一分析各影响因素的敏感性,采用有限元分析软件OpenSees建模分析、评估两类延性不同但具有相同尺寸及配筋率的结构的抗震性能,分别从结构与构件层面对比不同延性结构失效模式的差异性。分析结果表明,低延性结构抗震能力较新建结构差,但均满足现行抗震规范“大震不倒”的设计要求;当增强地震作用后,低延性结构的抗震性能远弱于新建结构,具体表现为延性低,耗能差,抗倒塌能力弱,易发生脆性破坏,结构低延性特征明显。
The main influencing factors of the seismic performance of low ductility RC frame structures which are not set high in seismic fortification level and the seismic structures are inadequate and have been in service for many years are summarized. Based on this, the sensitivity of each influencing factor is analyzed one by one from the component level, Element analysis software OpenSees modeling analysis to evaluate the seismic performance of two structures with different ductility but with the same size and reinforcement ratio, and contrast the different failure modes of different ductility structures from the structural and component level. The results show that the low-ductility structure has a lower seismic capacity than the new structure, but all of them meet the design requirements of the existing seismic code “big earthquake does not fall”; when the seismic effect is enhanced, the seismic performance of the low ductility structure is far weaker than that of the new structure, Specific performance of low ductility, poor energy consumption, anti-collapse ability is weak, prone to brittle failure, low ductile characteristics of the obvious.