大跨径混合梁斜拉桥钢箱梁与钢混结合段桥面铺装力学特性对比分析  

Mechanical Analysis for Pavements on Steel Box Girders and Steel-concrete Combined Sections of Long Span Hybrid Beam Cable-stayed Bridge

作　　者：尹夏明 罗桑[2] 

机构地区：[1]江西省高速公路投资集团有限责任公司,南昌330025 [2]东南大学智能运输系统研究中心,南京210096

出　　处：《武汉理工大学学报》2015年第6期72-75,共4页Journal of Wuhan University of Technology

基　　金：教育部博士点基金(20110092120062);江西省交通运输厅科技项目(2010C0005)

摘　　要：根据大跨径混合梁斜拉桥九江长江公路大桥箱梁结构特征,采用通用有限元软件Abaqus分别建立了钢箱梁与钢混结合段的铺装结构有限元模型,对比分析了胎压为0.7 MPa和1.0 MPa作用下两种节段铺装结构层的力学响应分布规律。计算结果表明:钢箱梁铺装层的最大横向拉应力要大于最大纵向拉应力,最大层间剪应力出现在横隔板上方加劲肋两侧区域。钢混结合段铺装层的最大横向拉应力、层间剪应力以及最大竖向位移均发生在钢混结合段与钢箱梁段的接合面处。钢箱梁铺装层的主要力学控制指标值均明显大于钢混结合段铺装。研究结果可为钢箱梁桥与钢混梁桥的铺装设计提供力学计算依据。According to the long span hybrid girder cable-stayed box girder of Jiujiang Yangtze River Highway Bridge Structure characteristics,the finite element models（FEM）for pavements on steel box girders and steel-concrete combined sections were established using Abaqus software,respectively.The mechanical distributions of pavements under 0.7 MPa and 1.0 MPa tire pressure were calculated.The calculation results for pavement on steel box girder show that the maximal value of transverse tensile stress is more than the one of longitudinal tensile stress,and the maximal value of shear stress happens on the pavement upon the U ribs near the transverse diaphragm.As for the pavement on steel-concrete combined sections,the maximal values of transverse tensile stress,longitudinal tensile stress and vertical displacement appear on the joint surface between the steel-concrete combined section and steel box girder.The values of mechanical control indexes for pavement on steel box girders are significantly greater than those for pavement on steel-concrete combined sections.Research findings provide mechanical calculation basis for the design of pavements on steel box girder and steelconcrete combined sections.

关 键 词：钢箱梁 钢混结合段 铺装 力学控制指标 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]