钢筋混凝土连续梁结构非弹性内力分析

Analysis of Inelastic Internal Forces in the Structures of Reinforced Concrete-Continuous Beams

本文在试验研究的基础上分析了纲筋混凝土连续梁结构内力的非弹性特性,并指出目前国际上的两种极限设计法,即“部分极限设计法”和“完全极限设计法”所存在的问题。文中把纲筋混凝土连续梁内力发展的全过程归结为三个不同性质的阶段。第二个阶段,也即因裂矮而引起内力的非弹性重分布,是非弹性分析中的一个重要环节,可按建议的“虚梁法”进行简便计算,按照试验资料还分析了传统线弹性方法的误差。对完全非弹性分析所需的两个关键荷载——开裂荷载和塑性铰荷载的计算方法也进行了分析。

In this paper, based on the results of test research, the inelastic behaviour of internal forces in the structures of reinforced concrete continuous beams are analyzed and the limitations in such limit-design methods as the 'partial limit-design method' and the 'full limit-design method' which are currently used in the world are pointed out. The whole process of development of internal forces in reinforces concrete continuous beams are summarized as three different stages. The second stage, i. e. the inelastic redistribution of internal forces due to cracks which is a most important link in inelastic analysis, can be conveniently calculated by the proposed 'fictitious beam method'. The errors arising from conventional linear-elastic method arc also analyzed according to the test data. The method for calculating two key loads, the cracking load and the plastic hinge load that are necessary for full inelastic analysis, are also proposed.