考虑剪滞剪切效应的开裂混凝土箱梁挠度计算  

Deflection Calculation of Reinforced Concrete Box Girders Considering Effect of Shear Lag and Shear Deformation

作　　者：林丽霞[1] 吴亚平[1] 丁南宏[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《城市道桥与防洪》2013年第10期126-129,7,共4页Urban Roads Bridges & Flood Control

基　　金：国家自然科学基金项目(51268028);甘肃省自然科学基金(1107RJZA122);甘肃省财政厅资助项目(620029)

摘　　要：基于换算截面及等效刚度原理,提出了一种可同时考虑剪滞效应及横向剪切变形效应,并适合手算的开裂后钢筋混凝土箱梁在荷载作用下挠度近似计算方法。用该方法对一实验梁进行挠度计算,与不考虑剪滞剪切效应的挠度计算结果及实验结果进行了对比。结果表明,仅考虑开裂效应,而不考虑剪滞及剪切变形将使挠度计算结果偏小,钢筋混凝土箱梁在进行挠度计算时应计入剪滞效应及剪切变形影响。Based on the converted section and equivalent stiffness, an approximate method suitable for hand calculation is proposed to calculate the deflection of reinforced concrete box section girder after crack under the load action. The effect of shear lag and shear deformation can be included in by this method. The article compares the deflection calculation results and test results of a tested girder by this method and the method not to consider the shear lag and shear effect. The results show that the method only to consider the cracking effect and not to consider the shear lag and shear deformation will make the deflection calculation result smaller. The reinforced concrete box girder should be calculated with the effect of shear lag and shear deformation during the deflection calculation.

关 键 词：挠度 剪力滞 剪切变形 钢筋混凝土箱梁 

分 类 号：U441[建筑科学—桥梁与隧道工程]