波形钢腹板-钢底板-混凝土顶板连续组合箱梁的剪力滞效应  

Shear Lag Effects of Continuous Corrugated Steel Web-Steel Bottom-Concrete Top Composite Box Girders

作　　者：马驰[1] 刘世忠[1] 李爱军[1] 金学军[1] MA Chi;LIU Shizhong;LI Aijun;JIN Xuejun(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《应用数学和力学》2020年第5期517-529,共13页Applied Mathematics and Mechanics

基　　金：国家自然科学基金(51868040,51568036)。

摘　　要：考虑混凝土顶板和钢底板不同的模量,结合变分法推导了波形钢腹板-钢底板-混凝土顶板(CSWSBCT)组合箱梁剪力滞效应的控制微分方程组和边界条件,建立了CSWSBCT两跨连续箱梁跨中集中荷载、均布荷载作用下剪力滞系数的计算公式,采用模型试验梁对两种荷载工况下连续组合箱梁的剪力滞效应进行了分析.结果表明:其理论计算值与模型试验实测值和有限元值在波形钢腹板的顶底板上三者吻合较好,变化趋势一致,验证了计算公式的正确性;均布荷载作用下中间支点截面处顶底板的剪力滞系数最大值大于集中荷载工况下最大值,且在两种荷载工况下中间支点截面处波形钢腹板和混凝土顶板、钢底板交界处的剪力滞效应突出.With different moduli of the concrete top and the steel bottom,the governing differential equations and boundary conditions for shear lag effects of corrugated steel web-steel bottom-concrete top(CSWSBCT)composite box girders were derived with the variational method.The formula for shear lag coefficients of the 2-span continuous CSWSBCT box girder under concentrated load and uniformly distributed load was established.The shear lag effects of the continuous composite box girder under 2 loading conditions were analyzed through model beam tests.The results show that,the theoretical values are in good agreement with the measured values of model tests and the finite element values on the top and bottom plates of the box girder,and the changing trend is consistent,which verifies the correctness of the calculation formula.The maximum shear lag coefficients of the top and bottom plates at the support section under uniform load are larger than those under the concentrated load.The shear lag effects at the junctions of the corrugated steel web,the concrete top and the steel bottom at the middle support section are prominent under 2 loading conditions.

关 键 词：波形钢腹板 组合箱梁 变分法 剪力滞效应 

分 类 号：O302[理学—力学] TU318[建筑科学—结构工程]