体外预应力连续梁受弯性能的非线性分析

本文通过试验分析了体外预应力梁在整个加载过程中的反应。如;预应力筋材料的非线性本构关系,体外预应力筋偏心距的变化,在转向块处预应力筋受摩擦的影响等。同时利用条带法编制了有限元非线性分析程序ＥＰＲＣＳ,在单元刚度矩阵中,考虑了材料非线与几何非线性,轴力二次矩等。

Mechanical Properties of Continuous Externally Prestressed Beams and Nonlinear Analysis

This paper presents a comprehensive analytical method to predict the behavior of externally prestressed concrete beams throughout the entire range of loading up to ultimate load. The method takes into account of factors that influence the behavior of externally prestressed steel such as: material nonlinearity, shift of cable eccentricity, and the friction at deviators for external cables. Nonlinear analysis for the beams the authors take into all the factors that influence the behavior of external cables, in addition the authors use the strip method to program the finite element program EPRCS. In the stiff matrix, the authors take into many factors such as material nonlinear, geometrical nonlinear, second axial moment. The contrast between theoretical and experimental indicates that the model the authors use is in agreement with the real model, in particularly the model that external cables slip at the deviators well reflects the real behavior of external cables under load.