顺置式吊杆锚固区受力特性与极限承载力研究  

Study of Mechanical Behavior and Ultimate Carrying Capacity of Suspender Anchorage Zone in Axial Direction of Bridge

作　　者：高小妮[1] 贺拴海[2] 齐宏学[3] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [3]中交公路规划设计院有限公司,北京100088

出　　处：《桥梁建设》2012年第2期21-27,共7页Bridge Construction

基　　金：国家交通运输部西部交通建设项目(2011318812970);长安大学中央高校基本科研业务费专项资金项目(CHD2010ZY009)~~

摘　　要：为掌握顺桥向设置的吊杆锚固区在吊杆力作用下的受力特性和极限承载力,以某在建斜拉-自锚式悬索组合体系桥为依托工程,利用ANSYS软件建立壳单元空间有限元模型,对锚固区在最不利荷载作用下的受力性能进行研究;并分别采用线弹性及非线性分析方法对吊杆锚固区极限承载力进行分析,讨论构件的受力情况。结果表明:在最不利荷载作用下,钢锚箱及钢锚梁应力较横隔板应力小;除钢锚梁与横隔板焊接处应力集中现象显著外,各构件应力分布较均匀;各构件顺桥向变形较大。不同极限承载力分析方法表明,此类结构采用壳单元建模进行极限承载力分析时应仅考虑材料非线性。建议在此类结构设计时,对于横隔板刚度不足问题应给予足够重视。To have an understanding of the mechanical behavior and ultimate carrying capaci ty of suspender anchorage zone set in the axial direction of bridge under the action of suspender forces, a combined cable-stayed and self anchored suspension system bridge that was being constructed was cited as an example, the software ANSYS was used to set up the spatial shell finite element model, the mechanical behavior of the anchorage zone under the action of the worst load was studied, the ultimate carrying capacity of the anchorage zone was analyzed, respectively u- sing the linear elasticity and nonlinearity analysis methods and the force conditions of the compo- nents in the anchorage zone were discussed. The results of the study show that under the action of the worst load, the stress in the steel anchor box and steel anchor beam is less than that in the diaphragm. With the exception that the stress concentration in the welding of the steel anchor beam and diaphragm is notable, the stress distribution in all components is uniform and the de- formation of the components in the axial direction of the bridge is great. The results of the differ- ent analysis methods for the ultimate carrying capacity also show that when the ultimate carrying capacity of such type of the structure is analyzed, using the shell element model, the material nonlinearity should considered only and in the design of the structure, it is proposed that adeauateattention should be paid to the problem of insufficient rigidity of the diaphragm.

关 键 词：斜拉桥 悬索桥 吊杆 锚固力 极限状态 承载力 横隔板 材料 非线性 

分 类 号：U448.29[建筑科学—桥梁与隧道工程]