抗震设计中钢筋混凝土柱碳纤维布加固量的分析

Transverse CFRP Reinforcement for Reinforced Concrete Columns Strengthened with CFRP Sheets in Earthquake-Resistant Design

考虑在柱顶发生最大水平侧移的情况下,剪应力与正应力的共同作用效应,并采用莫尔库仑破坏准则进行分析,提出了一种确定抗震设计中钢筋混凝土框架柱碳纤维布加固量的近似计算方法.分析表明:箍筋与横向包裹碳纤维布的主要作用不是单纯抵抗剪力破坏或提高轴向压力作用下柱的变形能力,更重要的是它们约束了承受复杂应力状态的柱核心混凝土,从而提高了柱核心混凝土的变形和强度.

An approximate formulation to determine the amount of transverse carbon fiber reinforced plastic （CFRP） reinforcement for reinforced concrete columns strengthened with CFRP sheets in seismic areas is presented. The common effects of shear and axial stresses are assumed to be a function of the maximum drift ratio and interpreted by Mohr-Coulomb＇s failure criterion. The analysis results show that the main function of transverse CFRP sheets is to confine the concrete core subjected to a complex state of stress rather than to simply resist shear or to improve deformation under axial compression. So transverse CFRP sheets improve the strength and deformability of the columns.