钢-混凝土双面组合梁受拉钢筋有效分布宽度  

THE EFFECTIVE WIDTH OF REINFORCEMENT BARS FOR DOUBLE STEEL-CONCRETE COMPOSITE BEAM

作　　者：杨喜文[1] 段树金[1] 

机构地区：[1]石家庄铁道学院土木工程分院,石家庄050043

出　　处：《工程力学》2008年第A01期184-188,共5页Engineering Mechanics

基　　金：河北省自然科学基金项目(E2006000397)

摘　　要：负弯矩区桥面板中受拉钢筋的应力分布存在滞后现象。考虑"拉应力沿桥面板厚度方向变化",结合有限元法,研究受拉钢筋有效分布宽度的计算问题。对29根双面组合梁进行了非线性有限元分析,研究了中支点附近负弯矩区桥面板中受拉钢筋的有效分布宽度在加载全过程中的变化;对弹塑性阶段有效分布宽度的主要影响因素进行参数分析,提出了塑性阶段有效分布宽度的简化计算方法。Under hogging moment, the tensile stress of the reinforcement bar in the roadway slab varies with its distance from the girder web, which is termed as ＇shear-lag＇. Taking into account the tension stress varying through the thickness, a method for defining the effective flange width for the double composite section is proposed. 29 double steel-concrete composite beams are analyzed using nonlinear finite element method, and the effective widths of the reinforcement bars in the hogging moment zone near the middle support point are determined at different loading stages until collapse. Some dominant parameters are analyzed to illuminate the influence of effective width, and then a simplified calculating method at the plastic stage is proposed.

关 键 词：钢-混凝土双面组合梁 钢筋有效分布宽度 非线性有限元分析 剪力滞后 简化计算方法 

分 类 号：TU398.9[建筑科学—结构工程]