斜拉桥锚箱式索梁锚固区应力及传力途径分析  

Analyses of Stresses and Force Transmission Route in Box-Shaped Anchorage Zone for Cable-Stayed Bridges

作　　者：张育智[1] 李乔[1] 满洪高[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2006年第2期179-183,共5页Journal of Southwest Jiaotong University

摘　　要：为给出索力在主要焊缝间分配的定量描述及主要板件的受力特点和产生应力集中的原因,用有限单元法对锚箱式索梁锚固区应力进行了计算分析.研究表明:锚垫板传递总索力的约20%,其主要作用不是承担索力,而是将索力传给2块锚箱腹板;2块锚箱腹板与箱梁腹板的焊缝传递总索力的约80%,且2条焊缝传递的索力相近,剪应力沿焊缝长度方向呈“马鞍形”分布;各主要板件在面内、面外集中力及弯矩作用下有应力集中现象.The finite element method was used to investigate stresses in the box-shaped anchorage zone for a cable-stayed bridge in order to give the quantitative description of cable force distribution along principal welding lines, the mechanical characteristics of the main plates＂ and the cause of stress concentration. The research shows that the pad plate of the anchorage box bears about 20% of the total cable force, and its main function is not to bear the cable force but to transmit it to the two webs of the anchorage box. The two welding lines between the two webs and the girder web bear about 80% of the total cable force, and they bear almost equal force. The distribution shape of shear stress on the two welding lines looks like a saddle, and the concentration of stresses on the main plates is caused by in- plane and out-of-plane concentrated forces and bending moments.

关 键 词：锚箱式索梁锚固区 有限单元法 传力途径 应力集中 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]