箱梁剪力滞效应的梁格改进方法及精度分析  

Improved Grillage Method and Accuracy Analysis of Shear-lag Effect of Box Girder

作　　者：刘应龙 蔺鹏臻[1] 何志刚[1] 杨子江[1] LIU Ying-long;LIN Peng-zhen;HE Zhi-gang;YANG Zi-jiang(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院

出　　处：《兰州交通大学学报》2020年第1期9-13,19,共6页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(11790281,51878323);中国铁路总公司科技研究开发计划资助项目(2017G010-C)

摘　　要：通过改变网格划分方式,对传统的梁格法进行改进,计算了单室以及双室简支箱梁的剪力滞效应.为获得改进梁格法的计算精度,分别与试验值以及基于板、实体单元的数值模型解进行对比,并给出了虚拟横梁刚度的建议取值.结果表明:改进的梁格法具备良好的剪力滞效应分析精度,梁格计算值总体偏大.其中,集中荷载作用下与试验值最大相差8.9%,与板单元值的最大误差为11.0%;集中荷载以及均布荷载作用下,双室箱梁的梁格值与实体值的最大误差分别为10.4%、6.8%.By changing the grid division method,the traditional grillage method is improved,and the shear lag effect of single room and double room simply supported box girder is calculated.In order to obtain the calculation accuracy of the improved grillage method,the calculated values of grillage method were compared with the experimental values and the numerical model solution based on plate element and solid element respectively,and the recommended value of virtual beam stiffness is given.The results show that the improved beam grid method has a good accuracy in shear-lag effect,and the calculation results are generally larger.Among them,the maximum difference between the grillage value and the test value is 8.9% under concentrated load,and the maximum error with the plate element value is 11.0%.Under the concentrated load and the distributed load,the maximum error between the grillage value and the solid element value of the twin-cell box girder is 10.4%and 6.8%,respectively.

关 键 词：箱梁 剪力滞 梁格法 虚拟横梁刚度 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]