基于铺装受力的钢箱梁斜拉桥纵隔板位置优化  

Location Optimization of the Longitudinal Diaphragm in Steel Box Girder Cable-stayed Bridge Based on Surfacings Mechanical State

作　　者：刘洋[1] 姚波[1] 程刚[1] 王晓[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《北方交通》2010年第12期37-40,共4页Northern Communications

摘　　要：为改善钢桥面铺装受力状况,针对国内某斜拉桥钢箱梁纵隔板位置,建立了全断面钢箱梁节段和铺装的力学计算新模型,分析了两种纵隔板设置方案在荷载作用下铺装层最大拉应力、铺装与钢板层间最大剪应力等技术指标的变化及分布规律。结果表明,由于纵隔板的竖向刚度很大,在荷载作用下,纵隔板上方的铺装产生较大的横向拉应力,具有明显局部效应;荷载处于桥面板与U型加劲肋焊接点的正上方时,横向拉应力在距横隔板0～0.2m范围内快速增加,在0.2m处出现峰值;采用纵隔板设置方案二进行钢箱梁结构设计,优化了铺装的受力状况,横向荷位3为铺装最不利荷位。In order to optimize the location of longitudinal diaphragm in a steel box girder cable-stayed bridge,two 3D finite element models for different locations of longitudinal diaphragm were established by ANSYS which consist of steel box girder and surfacing.Distribution and variation of technical indictors such as maximum tensile stress in surfacing and maximum shear stress between surfacing and underlying steel plate were investigated.Results show that large transverse tensile stress occurs in the surfacings which are on top of longitudinal diaphragm for the reason of its large vertical stiffness.Transverse tensile stresses in surfacings increase quickly and meet its maximum value in the area at a distance of 0～0.2m from the diaphragm when the loads are right over the U-shaped rib welding points.The suggested solution method is moving the longitudinal diaphragm to the place 1.0m away from traffic loads.The location optimization of the Longitudinal Diaphragm can significantly improve mechanical state of surfacings.

关 键 词：钢桥面铺装 力学分析 有限元法 纵隔板 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]