混凝土箱梁截面剪力滞效应和偏载效应分析  

Analysis of Concrete Box Girder Section Shear- lag Effect and Eccentric Load Effect

作　　者：张海涛[1] 史庆春[1] 

机构地区：[1]天津市市政工程设计研究院,天津市300051

出　　处：《北方交通》2014年第11期25-29,共5页Northern Communications

摘　　要：箱梁属于空间结构,其受力呈现空间上的变化,由于剪力滞效应和偏载效应的存在,导致截面上的正应力分布不均匀,这与常用的初等梁假定并不符合,需要专门考虑其影响。为了总结这两种效应的特点和规律,采用实体有限元建立了全桥模型,计算了中载和偏载情况下连续梁桥的截面正应力分布,对以上两种效应进行分析,并考虑了关键参数宽跨比的影响效应。在此基础上,对设计中存在的不安全因素及其计算方法提出建议。A box girder is a spatial structure which is about to vary in its space when bearing stress due to non- uniform distribution of positive stress onto the section that caused by the existence of Shear- lag Effect and Eccentric Load Effect,which does not comply with the common used assumption of primary girder thus requires particular consideration of its effect. In order to summarize the characteristics and rules of these two effects,entity finite element has been used to establish the full bridge model,and the distribution of positive stress onto continuous girder bridge section under concentrated load and eccentric load conditions has been calculated,based on which this text analyzes the above mentioned two effects,taking into account the effect of width- span ratio of key parameters.On this basis,this text also gives suggestions for the insecurity factors that exist in design and the calculation method.

关 键 词：空间效应 剪力滞效应 偏载系数 连续箱梁桥 截面正应力 

分 类 号：U441[建筑科学—桥梁与隧道工程]