大跨径悬索桥钢桥面铺装受力特性分析  

Analysis on Mechanical Behavior of Steel Deck Pavement of Long Span Suspension Bridge

作　　者：陈章 张辉 李娣 胡越 CHEN Zhang;ZHANG Hui;LI Di;HU Yu

机构地区：[1]江苏省交通工程建设局,江苏南京210000 [2]江苏中路工程技术研究院有限公司,江苏南京210000

出　　处：《上海公路》2023年第1期77-82,94,M0006,共8页Shanghai Highways

摘　　要：为研究大跨径悬索桥钢桥面铺装的力学行为特征,建立了“整桥—箱梁节段—局部正交异性板”多尺度三阶段力学模型。分析了钢板厚度和横隔板间距等构造参数对桥面系受力的影响,以及在荷载作用下,铺装层应力最值、钢板应力最值等技术指标的变化和分布规律。得到如下结论:拉应力是导致铺装开裂的主要原因,疲劳裂缝沿桥梁纵向;以拉应力为控制指标时,钢桥面铺装在距离横隔板0.3 m范围内的受力最为不利;铺装层对车辆荷载应力响应具有较强的局部效应;适当增加钢板厚度,可有效减小由荷载作用引起的铺装层拉应力和钢板焊缝应力,提高结构抗疲劳性能;适当增加横隔板间距,可有效减小由荷载作用引起的钢板焊缝应力。In order to study the mechanical behavior of steel deck paving of long-span suspension bridges,a multi-scale and three-stage mechanical model of"whole bridge-box girder-local orthotropic plate"was established.The influence of the structural parameters such as the thickness of the steel plate and the spacing of the diaphragms on the stress of the bridge deck system and the variation and distribution of the technical indexes such as the maximum stress of the pavement layer and the maximum stress of the steel plate under the load are analyzed.The conclusions are as fllows.Tensile stress is the main cause of pavement cracking,and the fatigue cracks are along the longitudinal direction of the bridge.When the tensile stress is taken as the control index,the stress of steel bridge deck pavement is the most unfavorable within 0.3 m from the diaphragm.Pavement layer has strong local effect on vehicle load stress response.Increasing the thickness of steel plate can effectively reduce the tensile stress of pavement layer and weld stress of steel plate caused by load and improve the fatigue resistance of structure.The stress of steel weld caused by load can be effectively reduced by appropriately increasing the spacing of diaphragm plates.

关 键 词：钢桥面铺装 正交异性板 力学分析 轮载 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]