钢管、钢筋与混凝土联合承载的非线性分析

Nonlinear Analysis for Joint Resistance of Penstock and Reinforced Concrete Encasement Against Internal Pressure

本文用钢筋混凝土非线性有限元方法分析了龙羊峡水电站坝内钢管模型,得出了与模型试验相同的结果,从而说明了该方法及所用程序的可靠性.在此基础上,针对现行坝内钢管结构联合承载设计中存在的问题,用非线性有限元方法对该类结构进行了大量分析计算,弄清了它的受力特征,提出了联合承载的极限状态设计法.

By using the nonlinear finite element method for reinforced concrete structures, the model of the penstock in the Longyangxia Dam has been analyzed in this paper, and the results are in good agreement with those from model test. Therefore, the relaiblity of this method and of computer program used in this paper has been verified. On this basis, many caculations of penstocks in concrete dams have been done with this program to analgze the existing design method for the joint resistance of penstoch and its reinfoced encasement against the internal pressure and to find the mechanism of the joint resistance of such structures. Then, the limit state design procedure has been developed.