钢-混凝土叠合梁的收缩徐变计算分析

Shrinkage and creep analysis of steel-concrete composit beam

钢-混凝土叠合梁在长期荷载的作用下,混凝土板的徐变收缩会使截面的应力发生重分布。钢-混凝土叠合梁由于收缩徐变效应使得结构在外荷载不变的情况下,变形持续增加,最终的变形值会影响到结构的使用,准确计算出结构由收缩徐变引起的变形值,在进行结构的收缩徐变效应分析时是很有必要的。本文采用龄期调整有效模量法与有限元法相结合的计算方法,对于预应力结构的收缩徐变,考虑预应力和混凝土的收缩徐变两者相互交换耦合作用,使得分析结果更加精确,从而使混凝土结构的收缩徐变计算能够更近于实际,有利于准确的计算出收缩徐变对钢-混凝土叠合梁的影响。

Steel-concrete composit beam works in long term loads, the shrinkage and creep of concrete slab leads to stress redistribution.Because fo the effects of shrinkage and creep,the beams deformation increased continuously when the external loads keeps invariant.The deformation can directly affect the structure normal working.So,it is necessary to accurately calculate the deformation of the beams which produced by the shrinkage and creep when structure is analysised.Age-adjusted effective modulus method combined with finite element method for shrinkage and creep of prestress structure is derived in the paper.According to the coupling effect of prestress and shrinkage and creep of concrete which can help to obtain more accurately solution,which be more close to the practice. And the shrinkage and creep effect on steel-concrete composit beam could be accurately calculate.