粘钢加固轴心受压钢筋混凝土柱的利用率及可靠度分析

Utilization level and reliability analysis of reinforced concrete columns strengthened by externally bonded steel plates under axial compression

根据我国《混凝土结构设计规范》(GB50010—2002)和《混凝土结构加固设计规范》(GB50367—2006)中假定的混凝土应力-应变关系和极限应变值,推导了粘贴钢板能被充分利用的界限条件;得到了粘钢加固钢筋混凝土轴心受压柱的承载能力计算公式,并由此建立了粘钢加固钢筋混凝土柱的极限状态方程,通过一次二阶矩法计算了由使用功能改变引起的粘钢加固柱的可靠度指标,计算结果表明按此极限状态方程设计的粘钢加固混凝土柱的可靠度满足《建筑结构可靠度设计统一标准》(GB50068—2001)的要求。

Based on the stress-strain relationship and limit strain value of concrete presented in Code for design of concrete structures （GB50010--2002） and Design code for strengthening concrete structures （GB50367--2006）, the boundary conditions of the full utilization of the externally bonded steel plates were derived. The formulas of bearing capacity of reinforced concrete columns strengthened by externally bonded steel plates under axial compression were proposed, the limit state equation was established, and the reliability index of reinforced concrete columns strengthened by externally bonded steel plates due to increased loads was calculated with first order second moment. It was shown that the reliability designed by this method could meet the demands of Unified standard for reliability design of building structures （ GB50068--2001 ）.