钢-砼组合梁在短期荷载下考虑砼非线性因素的刚度修正

The Stiffness Revising to the Composite Beams of Steel and Concrete Considering the Non-Liner Relationship of Concrete under Short-Term Load

本文通过考察砼的应力-应变曲线,说明在一般计算钢-砼组合梁的挠度时取固定的砼弹性模量进行截面换算时所存在的问题。并在假定已知砼的应力-应变关系的前提下,推导了在短期荷载作用下考虑砼应力-应变非线性性质的钢-砼组合梁的刚度修正式。通过试验验证,计算值与实测值吻合良好。因此,本文所提出的修正公式可作为设计参考。

In this paper,after studying the strain-stress curve of concrete,some problems existing in general calculating the defletions of the composite beams of steel and concrete,usually a fixed modular of concrete being used to transform cross section,are illustrated.And a revised stiffness of composite beams has been derived under the hypothesis that the strain-stress curve of concrete is known.The test date of seven full-scale test beams show that the calcula- tion results from the method of this paper are quite corresponding to the tests.Therefore,the revised formula put out in this paper is adoptable for practical design purposes.