FRP布钢与混凝土预应力组合梁受力分析

利用FRP(纤维增强复合材料)耐腐蚀、轻质、高强等优点,在钢与混凝土预应力简支组合梁下表面粘贴FRP布,形成能够有效减小变形和提高承载力的新型FRP布钢与混凝土预应力组合梁.以数值积分方法为基础,考虑材料非线性,提出该组合梁由加载至破坏的全过程非线性分析模式,研制计算程序,得到荷载与变形、荷载与预应力增量关系曲线,对其进行全过程非线性分析,明确组合梁不同受力阶段的工作特性,并通过算例验证该分析模式的正确性.

Stress Analysis of Prestressed Steel-Concrete Composite Beams Reinforced with FRP Strips

Taking advantage of FRP(fiber-reinforced polymer) that is anticorrosive,light and of high strength,the FRP strips were stuck on the flange bottom of H-beam of a simply-supported prestressed steel-concrete composite beam,thus enabling the composite beam to reduce effectively its deformation and improve its loadbearing capacity.Based on numerical integration and taking account of the beam's nonlinear materials,the nonlinear analytic models are developed for the beam in the whole process from receiving load to failure.Then,the computation procedure is programmed to obtain the relationship between load and deformation and that between load and prestressed increment.The whole process is thus analyzed nonlinearly to clarify the working characteristics of the composite beam in different stress/strain variation phases.An example is given to verify the validity of the analytic models proposed.