蝶形腹板混凝土箱梁的变形计算研究  

Deformation calculation research of concrete box girder with butterfly web

作　　者：焦广如 陈建兵[1] 张云飞 JIAO Guangru;CHEN Jianbing;ZHANG Yunfei(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,苏州215011

出　　处：《建筑结构》2023年第24期68-73,35,共7页Building Structure

基　　金：江苏省研究生科研与实践创新计划项目(SJCX19_0837)。

摘　　要：蝶形腹板混凝土箱梁作为一种创新的桥梁结构,为了精确地分析蝶形腹板混凝土箱梁在荷载作用下的变形,利用费氏空腹理论对蝶形腹板混凝土箱梁进行等效换算,根据单位荷载法和分段积分法,推导出在不同荷载工况作用下的蝶形腹板混凝土箱梁变形理论计算公式,并采用ABAQUS软件进行数值模拟验证。结果表明:蝶形腹板混凝土箱梁的弯曲变形约占总变形的25%,剪切变形对蝶形腹板混凝土箱梁的变形贡献较为突出,约占总变形的75%,剪力次弯矩产生的变形约占总变形的0.1%。相对于理论计算公式所得集中荷载和均布荷载作用下的跨中截面变形量,有限元分析值相对偏差分别为4.74%和2.3%,两者吻合良好,验证了推导的理论计算公式的正确性。该理论计算公式可为此类结构在弹性阶段的变形计算提供简化的计算方法。The concrete box girder with the butterfly web is an innovative bridge structure.In order to accurately analyze the deformation of concrete box girder with the butterfly web under load,Fee’s vierendeel truss theory was used to perform the equivalent conversion of concrete box girder with the butterfly web.According to the unit load method and the piecewise integral method,the theoretical calculation formula of the deformation was derived for the concrete box girder with the butterfly web under different loading cases,which was numerical verified by the ABAQUS software.The results show that bending deformation accounts for about 25%of the total deformation,and the shear deformation contributes prominently to the deformation of concrete box girder with the butterfly web,accounting for about 75%of the total deformation.The deformation caused by the shear secondary bending moment accounts for 0.1%of the total deformation.Compared with the calculated deformation of the mid-span section under concentrated load and uniform load,the relative deviation of the finite element analysis is 4.74%and 2.3%respectively.The two calculated results are in good agreement,indicating the correctness of the derived theoretical formula,which provides a simplified method for the deformation calculation of the similar structures in elastic stage.

关 键 词：蝶形腹板 混凝土箱梁 变形计算 剪切变形 有限元法 

分 类 号：TU398[建筑科学—结构工程]