曲线U型钢腹板组合箱梁剪力滞效应研究  

Study on Shear Lag Effect of Composite Box Girder with Curved U-shaped Steel Webs

作　　者：王连广[1] 黄学达 陈力栋 WANG Lianguang;HUANG Xueda;CHEN Lidong(School of Resources and Civil Engineering,Northeastern University,Shenyang,China,110819)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《沈阳建筑大学学报（自然科学版）》2021年第5期769-778,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金青年基金项目(51808100);辽宁省自然基金指导计划项目(2019-ZD_0004);辽宁省自然科学基金项目(20170540303)。

摘　　要：目的为确定影响曲线U型钢腹板组合箱梁剪力滞效应的主要参数,提出一种计算曲线组合梁剪力滞的求解方法。方法基于能量原理,同时考虑弯矩耦合和滑移效应的影响,选用抛物线型和余弦函数型位移函数曲线,对已建立的剪力滞控制微分方程和边界条件给出数值计算格式。采用差分法分析各参数的影响。结果U型钢腹板组合箱梁顶板的应变曲线随剪力滞翘曲位移函数的不同选择差别不大,但底板的应变曲线差别较大。混凝土顶板厚度和强度等级对顶板的有效宽度系数几乎没有影响;有效宽度系数随着滑移刚度的增加而减小,随曲率半径和跨宽比的增加而增加;当悬翼比小于1时,剪力滞效应随悬翼比增加而增加,当悬翼比大于1时则相反。结论得到组合梁进行不同剪滞翘曲位移下应变曲线规律及各参数对曲线组合梁的影响曲线,为解决曲线组合梁剪力滞问题提供了思路。In order to determine the main parameters of shear lag effect of u-shaped steel web composite box girder,a method for calculating the shear lag effect of curved composite box girders was proposed.Based on the energy principle and also considering both the sliding effect and the bending-torsional coupling effect,the parabolic and cosine function displacement functions were selected for constructing a numerical calculation format for the established shear lag control differential equation and boundary conditions.After using the difference method to analyze the influence of each parameter on the shear lag effect,the strain curve of the roof of u-shaped steel web composite box girder has little difference with the different selection of the shear-hysteresis warping displacement function,however,the strain curve of the bottom plate has large difference.The concrete roof thickness and concrete strength grade has little effect on the effective width coefficient of the roof.However,the effective width is inversely proportional to the slip stiffness and is in direct proportion to the radius of curvature as well as the width-span ratio.When the suspension-ratio is less than 1,the shear lag increases as the suspension-ratio rise,but the opposite is true in the situation of the suspension ratio is greater than 1.The law of the strain curve under different shear-hysteresis warping dispositions of the composite beam and the influence curve of each parameter on the curved composite beam are obtained.It provides an idea to solve the shear lag problem of curved composite beams.

关 键 词：曲线组合箱梁 能量变分法 差分法 剪力滞效应 翘曲位移函数 

分 类 号：TU398[建筑科学—结构工程]