单孔厚壁框架的内力计算及配筋研究

Calculations of Internal Force and Reinforcement of Thick-Walled Frames

本文对现行厚壁框架内力计算和配筋方法所存在的问题进行了研究,并探讨了合理的设计方法。文中采用考虑材料非线性和裂缝开展的钢筋混凝土非线性有限元程序,对厚跨比h/l≥1/4的厚壁框架进行大量计算,对该类结构在均布压荷作用下自开始受力至破坏的整个过程的受力特征进行了研究,并在此基础上提出了厚壁框架的内力计算、抗裂设计和强度设计的实用计算公式。

This paper analyses the real strain state of the thick-walled frame,and discusses its rational design method.The nonlinear finite element program for reinforced concrete,including the effects of material nonlinearity and crack development,is used to analyse the thick-walled frame with the thickness-span ratio equal to or greater than one quarter and to study the characteristics of the structure under the uniformly-distributed load in the whole process from the beginning of loading to the failure of the structure. Based on the results of this analysis,the formulas for the thick-walled frame are presented for the calculation of the internal forces,the capacity against cracking,and thes trength against failure.The results given by this method is in good consistence with the results of the nonlinear finite element analysis.