高强钢筋对框架结构抗震破坏机制和性能控制的研究

Study on Failure Mechanism and Seismic Performance of Passive Control RC Frame against Earthquake

本文针对钢筋混凝土框架结构,在柱中配置高强钢筋作为纵筋,以实现对结构抗震破坏机制和性能的控制,并利用其弹性恢复特性,减小结构震后的残余变形。论文采用弹塑性时程分析方法,通过普通配筋和高强配筋的两个3层框架结构的地震响应分析,研究了高强钢筋对框架结构抗震破坏机制和性能控制的效果,及其地震响应和震后残余变形。研究结果表明,采用高强钢筋配筋后,不仅提高了框架结构整体抗震承载力,而且完全避免了出现柱铰屈服机制,并且地震后结构具有很小的残余变形,结构的损伤仅发生于框架梁端,有利于震后的加固修复。

To achieve better structural performance during earthquake and to minimize rehabilitation and strengthening costs after seismic event is the main objective of the earthquake resistant design. With the invention of the high performance materials and their introduction to the structures, the failure mechanism and seismic performance, especially the residual deformation, can be improved. The Passive Control RC Frame （PF） reinforced with high strength reinforcements in columns are investigated with nonlinear time history analysis method in this paper. It is found that the high strength reinforcements not only provides the RC frame more resistance against lateral earthquake loadings but also reduced the residual displacements after going through dynamic event. And the use of high performance steel in columns can prevented the critical column base sections from yielding and totally eliminated the possibility of soft story failure mechanism. Moreover the strengthening and rehabilitation demands reduced and required only at the beam end sections. With the absence of total collapse mechanism, it is envisaged that the use of PF would yield safer structures and the potential danger of complete demolition can be reduced.