【作者】 王子健；

【导师】 强士中；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2004， 硕士

【摘要】 剪力滞(应力分散)问题很早就有学者对其进行研究，最初是在航空工程上，后来应用到土建工程当中，经过20多年的发展，对剪力滞的研究也取得了一些成果，解决了一些实际工程问题，但许多问题并没有得到完全的解决，随着我国交通事业的发展，有关剪力滞的新问题也在不断出现，需要进一步的研究，本文就剪力滞的问题进行了如下的一些工作： 1．对于箱形截面主梁，本文考虑剪力滞效应的变形特点，根据箱梁纵向位移函数，采用基于能量变分法基础上的最小势能原理推导出系统的总势能表达式，然后通过变分法得到带有不同边界条件的一组微分方程，并写出轴向应力的解析表达式。结合实际的算例研究了等截面简支梁的剪力滞效应。采用截面当量法研究了变截面连续梁的剪力滞效应。 2．就悬臂梁的负剪力滞现象进行理论分析和推导，并结合实际算例来对悬臂梁负剪力滞现象进行参数分析。 3．阐述了宜宾中坝金沙江斜拉桥的模型试验，并结合该桥的模型试验数据，研究该斜拉桥的剪力滞效应。 通过本论文的工作，箱形截面梁桥的设计、分析提供更安全、合理的设计依据。更多还原

【Abstract】 Shear lag phenomena or the nonuniform distribution of bending stress across wide flanges of beam cross section have long been recognized and studied.First studies were mainly concerned with stiffen beam of I shape in aviation engineering,while later concerned with civil engineering. Some research outcomes about shear lag problems were attained and part of project problems were solved during the twenty years.with the development of communication there are still many problems which need farther research.In this dissertation,shear lag effect is studied.The main contents are the followings.1.A general potential energy equation is derived according to the principle of minimum potential energy and a set of differential equations with different boundary conditions are derived according to variational principle method considering the deformation properties and longitudinal displacement functions of constant depth box girders.The shear lag effect of simple supported beam will be studied with an exaraple.The method of substitute variable is applied to study the shear lag effect of continuous box girders with variable depth.2. The negative shear lag effect of the cantilever and continuous girders is studied and the parameters which influence the shear lag effect is analysed.3.Combining with the experiment of Yibin Zhongba Jinshajiang cable-stayed bridge concrete model,this dissertation analyses the shear lag effect of the cable-stayed bridge.By the work of this dissertation ,more safer and more reasonable design and analysis method for box gerder have been offered.更多还原