悬浇混凝土箱形拱圈截面宽高厚比限值研究  

Research on Limit Value of Width-height-thickness Ratio of Cantilever Concrete Box Arch Ring Section

作　　者：浮涛 田振生 FU Tao;TIAN Zhen-sheng(Zhengzhou Communications Planning Survey&Design Institute,Zhengzhou 450000,China)

机构地区：[1]郑州市交通规划勘察设计研究院,郑州市450000

出　　处：《北方交通》2020年第4期18-21,26,共5页Northern Communications

摘　　要：悬浇混凝土拱桥主拱圈多采用薄壁箱形截面,存在薄壁板件局部稳定问题,对箱形拱圈截面局部稳定性进行研究,基于弹性薄板理论和拱的等效压杆理论,以板件局部失稳时的临界应力大于受压构件允许应力为条件,保证拱圈截面不发生局部失稳破坏,推导局部稳定宽厚比限值理论公式,最后以某悬浇混凝土拱桥为工程背景,采用大型通用有限元软件ANSYS建立板壳模型加以验证,结果表明,理论推导的局部稳定宽厚比限值与有限元分析确定的局部稳定宽厚比限值较为吻合。The thin-walled box section is usually used for the main arch ring of cantilever concrete arch bridge,which has the problem of local stability of the thin-walled plate piece. The research on the local stability of box arch ring section is carried out. Based on the elastic thin plate theory and the equivalent strut theory of the arch,the critical stress of the local instability of the plate piece is greater than the allowable stress of the compression member,so as to ensure that the section of the arch ring does not suffer from local instability failure.The theoretical formula of the limit value of the local stable width-to-thickness ratio is deduced. Finally,taking a cantilever concrete arch bridge as the engineering background,the plate shell model is built by using the large-scale general finite element software ANSYS to verify. The results show that,the limit value of the local stable width-to-thickness ratio deduced by the theory is quite consistent with that determined by the finite element analysis.

关 键 词：悬浇混凝土拱桥 薄壁板件 局部稳定 临界应力 宽厚比限值 

分 类 号：U448.223[建筑科学—桥梁与隧道工程]