FRP加固钢筋混凝土梁斜截面承载力分析模型

An Analytical Model for Carrying Capacity of Oblique Section of Reinforced Concrete Beams Strengthened with FRP Plates

实际工程结构由于设计、施工方面的原因,或者因为腐蚀老化、风灾、火灾等,可能导致钢筋混凝土梁斜截面承载力不足。FRP复合材料以其高强、轻质、施工方便等优点,在工程结构补强加固方面颇受关注。本文结合结构加固过程的特点,考虑到FRP加固部分的应力滞后效应,根据桁架比拟方法和修正压力场理论,利用应力平衡方程、材料本构关系和变形协调条件,给出了确定加固钢筋混凝土梁抗剪承载力的分析模型。

Reinforced concrete beams can be deficient in carrying capacity due to a variety of factors:design calculations, construction faults, erosion in severe environment, or disasters caused by windstorms and fires. Fiber reinforced plastic(FRP) plates in the strengthening and repair of concrete beam are currently thought promising, mainly due to its high strength and light weight, and ease of fabrication and installation. Based on truss analogy and modified compression field theory, using the equilibrium equation of stress , the stress-strain laws and the constitutive relationship ,taking into account the backward in stress of the strengthened part of FRP plates, combined with features of structure strengthening, the paper determines the analytical model for shearing-resistance carrying capacity of reinforced concrete beams strengthened with web-boned FRP plates.