支座脱空对拼宽空心板桥协同工作性能的影响  

The influence of bearing vacancy on the cooperative performance of spanned hollow slab bridge

作　　者：徐传昶 王阳春 高华睿 刘千军 李枝军[3] XU Chuanchang;WANG Yangchun;GAO Huarui;LIU Qianjun;LI Zhijun(Shandong Expressway Engineering Testing Co.,Ltd,Jinan 250002,China;Shandong High-speed Construction Management Group Co.,Ltd.,Jinan 250014,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211800,China)

机构地区：[1]山东高速工程检测有限公司,山东济南250002 [2]山东高速建设管理集团有限公司,山东济南250014 [3]南京工业大学土木工程学院,江苏南京211800

出　　处：《山东建筑大学学报》2024年第3期107-112,共6页Journal of Shandong Jianzhu University

基　　金：山东省交通运输科技计划项目(2019B33)。

摘　　要：空心板桥是目前中小跨径桥梁应用最广泛的桥型之一,而支座脱空是该类桥梁较突出的病害,会导致桥梁受力体系发生改变,对空心板、铰缝及拼宽湿接缝产生不利影响,严重者会发生开裂甚至破坏。针对此问题,文章分别从不均匀沉降对支座受力的影响、支座脱空对桥梁结构受力的影响及提升措施展开研究。结果表明:拼宽桥不均匀沉降会导致支座受力不均甚至脱空;部分支座脱空会加剧其余支座受力不均,使其脱空或被压坏,并且增大空心板、铰缝和拼宽湿接缝的横向拉应力,可能导致开裂;减小支座的竖向刚度可改善支座反力的分布,控制支座脱空现象的发生。Hollow slab bridge is among the most common types for medium and small span bridges.A significant issue with these structures is bearing void,which alters the bridge’s stress system,negatively affects the hollow slab,hinge joints and widened wet joints,and even lead to severe cracking or damage.In order to solve this problem,this study analyses the influence of uneven settlement on the bearing,the impact of bearing void on the bridge structure and the lifting measures.The results indicate that the uneven settlement of the split-width bridge will lead to uneven bearing force or even void.The void of some bearings will aggravate the uneven stress of other bearings,make them void or crushed,and increase the transverse tensile stress of hollow slab,hinge joint and widened wet joint,which may lead to cracking.Reducing the vertical stiffness of the bearing can improve the distribution of the reaction force of the bearing and control the occurrence of the bearing void.

关 键 词：拼宽空心板桥 支座脱空 支座反力 接缝受力 控制措施 

分 类 号：U448[建筑科学—桥梁与隧道工程]