波形钢腹板简支组合梁桥梁端混凝土附加应力  

Additional Stress of Concrete Slabs Near Supports of Simply-Supported Composite Girder Bridges with Corrugated Steel Webs

作　　者：张愉 张云 罗婷倚 刘玉擎[3] ZHANG Yu;ZHANG Yun;LUO Tingyi;LIU Yuqing(CCCC Highway Consultants Co.,Ltd.,Beijing 100088,China;Guangxi Beitou Construction&Investment Co.,Ltd.,Nanning 530000,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]广西北投公路建设投资集团有限公司,南宁530000 [3]同济大学土木工程学院,上海200092

出　　处：《结构工程师》2022年第5期1-7,共7页Structural Engineers

基　　金：广西重点研发计划(桂科AB110008,桂科AB22080013)。

摘　　要：波形钢腹板简支组合梁桥腹板剪切刚度小,梁端区段腹板剪切变形受到端横梁的约束,混凝土顶底板容易产生附加弯曲应力,基于平截面假定的应力计算方法不再适用。为此,考虑波形钢腹板的剪切变形,基于弹性力学理论推导了在集中荷载和均布荷载作用下梁端区段混凝土顶底板正应力的解析解。结果表明:简支组合梁桥混凝土桥面板附加应力在梁端为峰值,且随着梁端距离的增大应力值逐渐减小至0,长度约为梁高的0.6倍,此范围内平截面假定不再适用;附加应力竖向分布呈现混凝土顶底板上缘受拉、下缘受压,中性轴为0的规律;梁端附加拉应力最大值发生在梁端混凝土顶、底板的上表面,设计中应对梁端混凝土顶底板上表面采取相应的抗裂措施。The shear stiffness of corrugated steel webs is weaker than that of concrete webs,which will leads to a large shear deformation. Additional stress appears in the concrete slabs near supports of the bridge girder due to the restriction of shear deformation of corrugated steel webs by the end crossbeams. The quasi plane section assumption is not applicable in this case. Analytical solutions of concrete normal stress considering the shear deformation of steel webs were derived based on the theory of elasticity in this paper. The results indicate that the maximum additional stress of the top and bottom concrete slabs exists in the end section of the composite girder. The additional stress decreases to zero as increasing of the distance from end section,and the distribution length is about 0.6 times of the beam height,where the quasi plane section assumption is no longer applicable. The additional stress at the upper surface of the concrete slab is in tension,while the lower surface shows a compressive stress,with zero at the neutral axis. Maximum additional tensile stress occurs at the upper surface of the concrete slabs at the beam end,thus measures should be taken to prevent possible cracks of concrete in this region.

关 键 词：组合梁桥 波形钢腹板 附加应力 端横梁 计算方法 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U445.57[交通运输工程—道路与铁道工程]