混凝土非均匀强化塑性理论的改进

THE IMPROVEMENT OF NONUNIFORM HARDENING PLASTIC THEORY OF CONCRETE

本文对文献〔1〕提出的混凝土的非均匀强化塑性理论进行了研究,并作了改进,改进后的理论以载荷性质作为分区的原则来构造加载面,使得加载面的构造更为合理;同时,也采用了新的方法构造了基准面,使其与单轴压缩载荷路径的关系更为直接,物理意义更明确;另外,本文还提出了一种新的等效应力的定义,经与实验结果比较,改进后的理论具有较好的精确度。

In this paper, the improvemesnt are given to the nonuniform hardening plastic theory of concrete proposed in reference. The theqry improved is applied to construt the loading surface with the principle of dividing regions according to loading types, so that the construction of loading surface becomes more reasonable; meanwhile, a new method is adopted to construct the base surface so that the relation between the base surface and the uniaxial compressive loading path is more direct and the physical meaning is' clearer. Besides, a new definition of equivalent stress has been proposed in this paper. 'Comparison between the theoretical and experimental results proves the improved theory is more accurate.