FRP钢骨混凝土梁正截面抗弯承载力计算

Calculation of Flexural Capacity of SRC Beams Strengthened with FRP

为了进一步研究纤维增强复合材料(fiber reinforced polymer,FRP)加固后钢骨混凝土(SRC)梁的破坏机理、受力性能问题,在以往FRP加固钢筋混凝土(RC)梁力学性能理论分析结果的基础上,对FRP加固钢骨混凝土梁的力学性能进行分析.将未达到极限应力状态的非线性混凝土应力图转化成了等效矩形应力图,从而给出等效矩形应力图计算系数m,n.根据不同的破坏形态,推导了FRP加固钢骨混凝土梁的正截面抗弯承载力相关方程,公式形式简单,概念明确,便于实际应用.根据不同的破坏模式提出了相对界限受压区高度和FRP的界限配置率.

The mechanical properties of SRC beams strengthened with FRP （fiber reinforce polymer） are further investigated theoretically including its failure mechanism and loadability, based on earlier theoretical works on RC beams. The nonlinear stress diagram of the concrete in the state the stress is lower than its ultimate value is transformed into an equivalent rectangular stress diagram, then the relevant parameters rn and n are given equivalently. And the correlation equation of flexural capacity on the cross section of SRC beam strengthened with FRP is deduced according to different types of failure. The equation is expressed clear, simple and easy to application. The depth of relative boundary compressive region and the boundary disposition rate of FRP are both given in view of different failure types.