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考虑剪力滞剪切效应的变截面箱梁挠度近似计算

发表时间:2011-06-30  浏览量:1332  下载量:646
全部作者: 林丽霞,吴亚平,丁南宏
作者单位: 兰州交通大学土木工程学院
摘 要: 基于等效刚度原理,提出了一种可同时考虑剪力滞效应及剪切变形效应,并适合手算的变截面箱梁荷载作用下挠度近似计算方法。通过一变截面悬臂箱梁算例分析,与初等梁理论计算结果进行了比较,结果表明:不考虑剪力滞效应及剪切变形效应将使得挠度计算结果偏小,横向剪切变形效应的影响大于剪力滞效应的影响。研究方法使解析计算理论能够方便地应用到工程实践中,为变截面箱梁的工程设计提供一种简单、有效的计算方法。
关 键 词: 桥梁工程;挠度;剪力滞;剪切变形;变截面箱梁
Title: Approximate calculation on deflection of variable section box girder considering the effect of shear lag and shear deformation
Author: LIN Lixia, WU Yaping, DING Nanhong
Organization: School of Civil Engineering, Lanzhou Jiaotong University
Abstract: Based on the equivalent stiffness principle, an approximate method suitable for hand calculation is proposed to calculate the deflection of variable section box girder bearing load, in which, the double effects of shear lag and shear deformation can be taken into account. It shows that the deflection calculated by elementary beam theory without considering shear lag effect and the shear deformation is smaller, comparing to results calculated by the approximate method proposed in the paper. For such variable section box girder, transverse shear deformation effect is greater than the shear lag effect when calculating the deflection. The approximate method offers a simple and effective calculating method for the design of box girder with variable cross section, in which, analysis formula can be applied in engineering practice through simple revision.
Key words: bridge engineering; deflection; shear lag effect; shear deformation; variable section box girder
发表期数: 2011年6月第12期
引用格式: 林丽霞,吴亚平,丁南宏. 考虑剪力滞剪切效应的变截面箱梁挠度近似计算[J]. 中国科技论文在线精品论文,2011,4(12):1121-1126.
 
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