三类混凝土受弯构件短期刚度通用公式

A General Formula for Short-Term Rigidity of Three Kinds of Concrete Members Subjected to Flexure

本文以双直线的弯矩-挠度曲线关系为基本计算模式,运用全过程非线性分析方法,利用计算机对有粘结、无粘结部分预应力与非预应力混凝土受弯构件进行大量的模拟计算,然后对模拟计算结果进行理论分析和数学回归分析来确定构件开裂后的平均刚度与各影响因素之间的量值关系,从而推导出适合上述三类混凝土受弯构件短期刚度的通用计算公式.对276根三类混凝土受弯试件的挠度计算结果表明,计算挠度值与试验实测挠度值吻合.

This paper is concerned with a general formula for computing the short-term rigidity of. partially prestressed flexural concrete members with bonded and unbonded tendons and non-prestressed flexural concrete members based on the bilinear relationship between bending moment and deflection. A great number of analog computations for these members have been carried out by nonlinear analysis. The general formula was then obtained after due consideration of the factors affecting the rigidity and with mathematical regression of the computation results. A comparison of test results of 276 different members with those calculated by the formula shows that the formula suggested is satisfactory.