体外预应力钢筋混凝土梁非线性静力分析

为了研究体外预应力结构的非线性性能，在截面条带法的基础上，将体外钢筋对梁的作用力看作是梁的外力，分析了体外钢筋应变和应力增量与梁体挠度之间的关系，建立了一种新的体外预应力钢筋混凝土梁非线性分析方法，避免了变形不协调和二次效应的影响，计算结果与有限元模拟结果和试验数据进行了比对分析。结果表明，该方法能较好地模拟外预应力钢筋混凝土梁从加载至破坏的全过程，并指出非预应力筋配筋率、初始预应力大小和高跨比等对梁承载力都有重要的影响。

Nonlinear static analysis of external prestressed RC beams

Nonlinear analysis is very important in the research of the external pre stressed structures. Based on the layered section method, the prestressed force was regarded as an external action to the beam, and the relationship between the external reinforcement stress and the beam deflection was analyzed. A new nonlinear method was proposed to analyze the simple supported reinforced concrete (RC) beams with external prestressing, which could avoid the effect of the uncoordinated deformation and the second order effect properly. The dynamic response of the RC beam analyzed by the method were compared with the numerical results and the experimental data, which shows that the method could reflect the evolutionary process of the damage initiation and propagation of the external pre stressed supported RC beams. And it should be pointed out that the reinforcement ratio, the initial prestress and the span depth ratio have a great influence on the static bearing resistance of the pre stressed beams.