预应力钢-混凝土组合连续箱梁的变形分析  

Deformation Analysis of Prestressed Steel-concrete Composite Continuous Box Beams

作　　者：戴业 肖勇刚[1] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410114

出　　处：《湖南城市学院学报（自然科学版）》2017年第2期33-37,共5页Journal of Hunan City University:Natural Science

基　　金：湖南省自然科学基金项目(14JJ4062)

摘　　要：以3片钢-混凝组合连续箱梁的变形试验为基础,其中RC1为普通组合梁,PC2和PC3为预应力组合梁,并结合虚功原理和换算截面法,提出了一种考虑自重、堆载、预应力和开裂影响的钢-混凝土组合梁变形计算方法.试验结果表明:预应力对钢-混凝土组合梁的变形影响较大,且有效预应力越大,跨中挠度越小;对于普通钢-混凝土组合连续箱梁,可通过考虑滑移效应的刚度折减法考虑混凝土板开裂对变形的影响;分析得到的理论挠度与实测挠度吻合较好.Based on the deformation test on three steel-concrete composite continuous box beams, RC1 is an ordinary composite beam, PC2 and PC3 are prestressed composite beams, combining with virtual work principle and principletransformed-section method, a deformation calculation method was presented for steel-concrete composite beams considering the effect of dead load, surcharge load, prestressed force, and cracks. The results indicate that the prestressed force has greater effect on the deformation of steel-concrete composite beams, and the deflection decreased in higher effective prestressing. The effect of cracks can be considered by the method of stiffness reduction for ordinary steel-concrete composite continuous box beams. The theoretical deflection analyzed by the method proposed in this paper are in good agreement with the measured result.

关 键 词：钢-混凝土组合连续箱梁 有效预应力 刚度折减法 换算截面法 

分 类 号：TU41[建筑科学—岩土工程]