震损加固后RC柱抗震性能影响因素分析

整理了国内外相关规范与相关研究中对RC柱抗震性态划分方法与指标限值,发现均是针对未震损未加固的RC柱。以相关试验得到的未预损未加固、未预损直接加固、预损后再加固的RC柱骨架曲线为对象,直接套用现有针对未震损未加固RC柱的性态划分方法与指标限值进行划分,得到对应各抗震性态分隔点处的位移角限值,发现3类RC柱在相同位移角下对应的性态不一致且差距较大,说明不能直接套用既有针对未震损未加固RC柱的抗震性态划分方法与指标限值。对50组不同预损情况与加固方式的RC柱骨架曲线进行对比,发现预损程度、加固方式和RC柱设计参数等因素对震损加固后RC柱抗震性能的影响较大,因此,震损加固后RC柱的抗震性态划分方法和指标限值需要进一步考虑这些因素影响。

Factors affect seismic performance of strengthened EQ damaged RC columns

This paper reviews seismic performance state division methods and related index values of RC columns in the design codes and the literatures.It has been found that these results are based on undamaged RC columns or strengthened undamaged ones.Based on the measured applied lateral load-top lateral displacement skeleton curves of the test specimens,which includes undamaged RC columns,strengthened undamaged RC columns and strengthened pre-damaged RC columns,the seismic performance states have been determined according to the available division methods and the related indexes of RC columns,and the displacement angle limits as the related indexes to separate each state are obtained.It was found that the corresponding states of the three kinds of RC columns at the same displacement angle are inconsistent and evendifferent significantly.This reveals that the existing seismic per‐formance state division methods and related index values cannot be directly applied to strengthened undamaged and strengthened damaged RC columns.By comparing the measured lateral load-top lateral displacement skeleton curves of 50 RC column specimens tested,it has been found that the degree of pre-damage,strengthening method and design parameters of RC columns have great influence on the seismic performance of strengthened RC columns.Therefore,the seismic performance state division method and related index values of strengthened EQ damaged RC columns should be further studied and the main influenced factors should be considered.