钢-UHPC-NC螺栓连接组合梁负弯矩区抗弯试验研究  

Experimental Study on Flexural Behaviors of Bolted Steel-UHPC-NC Composite Girders in Hogging Moment Zone

作　　者：杨大海 汪志甜[2,3] 王倩 史俊 YANG Dahai;WANG Zhitian;WANG Qian;SHI Jun(State Key Laboratory of Bridge Safety and Resilience,Beijing University of Technology,Beijing 100124,China;Anhui Transport Consulting&Design Institute Co.,Ltd.,Hefei 230088,China;Highway Traffic Energy Saving and Environmental Protection Technology Transportation Industry Research and Development Center,Hefei 230088,China;Central South University,Changsha 410083,China)

机构地区：[1]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [2]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088 [3]公路交通节能环保技术交通运输行业研发中心,安徽合肥230088 [4]中南大学,湖南长沙410083

出　　处：《桥梁建设》2025年第2期34-42,共9页Bridge Construction

基　　金：国家自然科学基金项目(52478225)。

摘　　要：为改善装配式钢-混组合梁墩顶负弯矩区桥面板开裂问题,以某装配式双工字钢-混组合梁桥为背景,提出钢-超高性能混凝土(UHPC)-普通混凝土(NC)螺栓连接组合梁,并对其抗弯性能进行研究。按缩尺比1∶5设计并制作1根钢-NC栓钉连接组合梁试件(试件P-1)和1根钢-UHPC-NC螺栓连接组合梁试件(试件P-2),开展试验梁在负弯矩作用下的静力试验,对其裂缝特征、开裂荷载、钢-混界面滑移、极限承载力等进行对比分析;并采用Abaqus软件建立试验梁有限元模型,分析螺栓连接度、预紧力和UHPC层厚度对钢-UHPC-NC螺栓连接组合梁受弯性能的影响。结果表明:与试件P-1相比,试件P-2的开裂荷载提高了40%,最大裂缝宽度降低了71%,梁端钢-混界面滑移提高了约56.6%;高强度螺栓及UHPC-NC叠合桥面板的联合应用可显著提高钢-混组合梁的抗裂性能,但对钢-混组合梁极限承载力性能的提高作用不明显;当抗剪连接度大于1时,螺栓连接度对钢-混组合梁的刚度、极限承载力及开裂荷载的影响较小,螺栓预紧力对钢-混组合梁极限承载力无明显影响,提高UHPC层厚度可提高钢-混组合梁的各项性能,但成本较高。建议UHPC层厚度取为桥面板厚度的1/4。This study focuses on the cracking issue of steel-concrete composite girders in the pier-top hogging moment zone.An existing bridge with superstructure consisting of double steel I-girders and concrete deck panels is used as a case.A type of bolt-connected composite girder is proposed,in which the steel girder,normal concrete(NC)deck panels and ultra-high performance concrete(UHPC)layer are connected by bolts.The flexural behaviors of the composite girder are examined via flexural tests and numerical simulation.A stud-connected steel-NC composite girder specimen(specimen P-1)and a bolt-connected steel-UHPC-NC composite girder specimen(specimen P-2)were prepared for static tests under hogging moments,on a scale of 1∶5.Parameters,including crack characteristics,cracking loads,steel-concrete interface slip and ultimate loading capacity,were analyzed.Numerical simulation was conducted to investigate the influence of tightening degree and preloads of bolts as well as UHPC layer thickness on the flexural strength of the bolted steel-UHPC-NC composite girder.The results demonstrate that compared with specimen P-1,the cracking loads,maximum crack width and girder-end steel-concrete interface slip of specimen P-2 are improved by 40%,decreased by 71%and increased by about 56.6%,respectively.The combined utilization of high-strength bolts and UHPC-NC composite deck panels can remarkably enhance the cracking resistance of the steel-concrete composite girder,while exerts negligible effect on the ultimate load bearing capacity of the steel-concrete composite girder.When the shear connection degree is over 1,the influence of bolt tightening degree is minor on the stiffness,ultimate load bearing capacity and cracking loads of the steel-concrete composite girder.The influence of bolt pre-loads on the ultimate load bearing capacity of steel-concrete composite girder is negligible.Improving the thickness of UHPC layer can lead to the enhancement of the performance of the steel-concrete composite girder,but relatively cost-consumi

关 键 词：装配式钢-混组合梁 螺栓连接 负弯矩 裂缝 钢-混界面滑移 极限承载力 抗弯试验 有限元法 

分 类 号：U448.218[建筑科学—桥梁与隧道工程] U448.216[交通运输工程—道路与铁道工程] U446.1