基于截面内剪力流分布规律的剪力滞效应分析  

Analysis of Shear Lag Effect Based on The Shear Flow Distribution Pattern

作　　者：周勇超[1] 孙铁军 郝先武[1] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]温州市交通投资集团有限公司,浙江温州325000

出　　处：《工程抗震与加固改造》2013年第2期44-49,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：交通运输部交通运输行业联合科技攻关项目(2010-353-333-140)

摘　　要：引起剪力滞效应的本质是截面内的纵向剪切变形。基于截面纵向剪力流的大小,提出了剪切翘曲位移函数修正系数。以此为计算模型,运用最小势能原理,结合变分方法,推导了考虑剪力滞效应的附加弯矩、挠度以及剪力滞系数的一般表达通式,并求解了在均布荷载作用下,简支箱梁的挠度与剪力滞系数的计算方法。结果表明,挠度与剪力滞系数与剪切转动趋势成正比,而与纵向剪切变形值无关。考虑修正系数的方法比传统的方法具有更高的求解精度。The nature of shear lag effect is caused by the longitudinal shear deformation of the cross-section. Based on longitudinal shear flow, correction factor of warping displacement function of shear deformation is defined. Through this calculation model, using the principle of minimum potential energy and variational method, the general formula of additional moment, deflection, shear lag coefficient are derived. What＇ s more, the deformation and shear lag coefficient on simple box girder beam are solved under uniformly distributed load. The results show that deformation and shear lag are proportional to shear rotation trends, and nothing to do with longitudinal shear deformation values. The calculation method of this paper is more accurate.

关 键 词：桥梁工程 剪力滞 最小势能原理 变分方法 翘曲位移函数 剪力滞系数 挠度 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]