带悬臂板单箱双室薄壁箱梁畸变效应分析  

Analysis on Distortion Effect of Single-box Twin-cell Thin-walled Box Girders with Cantilever Plates

作　　者：魏彦红 张元海[1] 周福成 刘泽翔 WEI Yanhong;ZHANG Yuanhai;ZHOU Fucheng;LUI Zexiang(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,甘肃兰州730070

出　　处：《湖南大学学报(自然科学版)》2025年第1期61-68,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52368020,51968040);兰州交通大学基础研究拔尖人才计划资助项目(2022JC17)。

摘　　要：为研究带悬臂板单箱双室薄壁箱梁的畸变效应,基于板梁框架法建立了畸变控制微分方程,给出竖向偏心集中荷载作用下该方程的初参数解,同时还导出了带悬臂板单箱双室截面箱梁畸变框架惯性矩的具体解析式.利用解析理论对悬臂梁和简支梁算例进行分析,研究结果表明:解析解与已有文献和有限元计算结果均吻合良好,验证了解析理论的正确性;通过参数分析可知,中腹板厚度越大,双室箱梁的抗畸变变形能力越强,中腹板厚度的变化对边腹板横向弯矩的影响很小,但中腹板的横向弯矩随其板厚的增大而增大,当中腹板厚度与边腹板厚度相等时,中腹板的横向弯矩可近似等于边腹板横向弯矩的2倍.To study the distortion effect of single-box twin-cell thin-walled box girders with cantilever plates,the distortion differential equation was established based on the plate-beam frame method,and the initial parametric solution of the equation under vertical eccentric concentrated load was derived.The concrete analytical formula of the distortion frame moment of inertia of single-box twin-cell box girder with cantilever plates was also presented.The analysis on the cantilever box girder and simply supported box girders examples was performed using analytical theory.The results show that the analytical solution is in good agreement with the results from existing literature and finite element analysis,which verifies the correctness of the analytical theory.Through the parameter analysis,it can be seen that the greater the thickness of the middle web,the stronger the ability of the twin-cell box girder to resist distortion.The transverse bending moment of the external webs is little influenced by the variation of thickness of the middle web,but the transverse bending moment of the middle web increases with the increase of its thickness.When the thickness of the middle web is equal to that of the external webs,the transverse bending moment of the middle web is approximately twice that of the external webs.

关 键 词：单箱双室薄壁箱梁 畸变效应 板梁框架法 畸变框架惯性矩 初参数法 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]