预应力钢-混凝土组合连续箱梁挠度分析  

Deformation Analysis of Prestressed Steel-concrete Composite Continuous Box Beam

作　　者：莫东山 曹国辉 MO Dongshanl;CAO Guohui(College of Civil Engineering ＆ Mechnies,Xiangtan University,Xiangtan,iCollege of Civil Engineering,Hunan City Universtiy,Yiyang,Hunan 413000,China)

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411100 [2]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《湖南城市学院学报（自然科学版）》2018年第5期7-11,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：对3片钢-混凝土组合连续箱梁跨中挠度进行了试验研究与理论分析,考虑开裂和滑移效应的影响,采用换算截面法和虚功原理建立了组合梁挠度计算表达式,推导了混凝土支座负弯矩区开裂长度计算表达式.研究结果表明,挠度理论计算值均与试验值吻合较好,预应力施加可提高混凝土开裂荷载,但对挠度的影响不显著.The mid-span deflection of the three pieces of the steel-concrete composite continuous box beam is analyzed in this paper. The calculation expression of the deflection of the composite beam is created and that of the crack length in the negative bending moment region of the concrete bearing is deducted, both of which are achieved by considering the influences of cracking and slip effects and using the conversion section method and the virtual work principle. The research shows that the calculated values of the deflection theory are well in accord with the experimental values. The application of prestress can increase the cracking load of the concrete and delay the cracking of the concrete. The influence of the prestress on the deflection is not significant.

关 键 词：预应力 钢-混凝土组合连续箱梁 刚度 开裂 挠度 

分 类 号：TU398.9[建筑科学—结构工程]