既有RC变截面柱加固前后的力学性能

Mechanical properties of existing RC variable cross-section column before and after reinforcement

针对变截面柱加层改造处存在的外力损伤、混凝土强度变低等问题,采用增大截面法、CFRP包裹法及粘钢加固法对构件进行加固并分析其受力性能。结果表明:增大截面法、CFRP加固法及粘钢加固法使原构件轴压承载力分别提升了113%、128%、112%,使侧压承载力分别提升了105%和192%及154%,但在周期荷载作用下粘钢加固法具有较大优势;增大截面法适用于提升变截面柱轴压承载力,CFRP加固适用于提升侧压承载力及轴压承载力,但两者均不适用于提升变截面柱抗震能力。而粘钢加固法相较于前两种方法均具有普适性。

This paper aims to solve the problems of external force damage and low concrete strength at the additional layer reconstruction of the variable cross-section column.The study involves using the enlarging cross-section method,the CFRP wrapping method and the bonded steel reinforcement method to strengthen the frame members and analyze their mechanical properties.The results show that by using the increased cross-section method,the CFRP wrapping method and the bonded steel reinforcement method.the axial bearing capacities of the original members increase by 113%,128%and 112%respectively;the lateral pressure bearing capacities increase by 105%,192%and 154%,respectively.But the bonded steel reinforcement method has great advantages under periodic load.The enlarging cross-section method is suitable for improving the axial bearing capacity of the variable cross-section column,and the CFRP reinforcement is suitable for improving the lateral pressure bearing capacity and axial bearing capacity,but neither of them is suitable for improving the seismic capacity of the variable cross-section column.Compared with the first two methods,the bonded steel reinforcement method is universal for both.