波形钢腹板—双管弦杆—混凝土板组合梁剪力滞效应分析  

Shear Lag Effect of Composite Box-girder with Corrugated Steel Webs,Double Concrete Filled Steel Tubular Chords and Concrete Slabs

作　　者：周勇超[1] 闫郝 赵亮[1] ZHOU Yong-chao;YAN Hao;ZHAO Liang(School of Highway,Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学公路学院,西安市710064

出　　处：《公路》2023年第5期80-86,共7页Highway

基　　金：国家自然科学基金项目,项目编号52078044。

摘　　要：波形钢腹板—双管弦杆—混凝土板组合梁是近年来提出的一种新型组合结构。基于能量变分原理,推导其剪力滞系数和挠度的计算公式;同时采用有限元方法分析典型荷载作用下顶板正应力和挠度的变化规律,并与公式计算结果对比分析。结果表明,竖向荷载作用下顶板呈现出典型的剪力滞效应,集中荷载下的剪力滞效应对比均布荷载更为明显;两种方法计算结果吻合良好,荷载作用下跨中截面处最大正应力、剪力滞系数及挠度误差均在6%以内。结果说明,本文推导的公式可用于该新型组合箱梁的剪力滞效应和挠度的计算。A new composite structure composed of corrugated steel webs,double concrete filled steel tubular chords and concrete slabs is presented in recent years.Based on the energy variation principle,the formulas of shear lag coefficient and deflection are derived.At the same time,the finite element method is used to analyze the variation law of the normal stress and deflection of the roof under typical loads,and the results are compared and analyzed with the formula calculation results.The results show that the roof under vertical load presents typical shear lag effect,and the shear lag effect under concentrated load is more obvious than that under uniform load.The results of the two methods are in good agreement.The maximum normal stress,shear lag coefficient and deflection error at the mid-span section under load are all within 6%.The results show that this formula can be used to calculate the shear lag effect and deflection of the new composite box girder.

关 键 词：桥梁工程 组合箱梁 剪力滞效应 能量变分法 波形钢腹板 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U448.216[交通运输工程—道路与铁道工程]