装配式波形钢腹板-UHPC组合梁抗弯试验研究  

Research on Flexural Test of Segmental Composite Girder with Corrugated Steel Webs and UHPC Deck Panels

作　　者：姜开明 宋启港 周剑 吕长荣 王阳春 JIANG Kaiming;SONG Qigang;ZHOU Jian;LYU Changrong;WANG Yangchun(Shandong Hi-speed Construction Management Group Co.,Ltd.,Jinan 261516,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;Shandong High-speed Engineering Consulting Group Co.,Ltd.,Jinan 250000,China;Shandong Hi-speed Engineering Testing Co.,Ltd.,Jinan 250002,China)

机构地区：[1]山东高速建设管理集团有限公司,山东济南261516 [2]南京工业大学土木工程学院,江苏南京211816 [3]山东高速工程咨询集团有限公司,山东济南250000 [4]山东高速工程检测有限公司,山东济南250002

出　　处：《桥梁建设》2024年第6期64-71,共8页Bridge Construction

基　　金：国家自然科学基金项目(51908282,52378160);山东省交通运输厅科技计划项目(2020B47)。

摘　　要：为了解装配式波形钢腹板-超高性能混凝土(UHPC)组合梁的抗弯性能,以某装配式工字钢-混组合梁桥为背景,按缩尺比1∶10制作波形钢腹板-UHPC组合梁、平钢腹板-UHPC组合梁、波形钢腹板-普通混凝土(NC)组合梁各1组进行三点弯曲试验,分析腹板形式、桥面板强度对组合梁负弯矩区破坏形式、裂缝分布规律及极限抗弯承载力的影响,并提出适用于波形钢腹板-UHPC组合梁的负弯矩区极限抗弯承载力计算方法。结果表明:3组试件均呈典型的受弯破坏特征;UHPC板裂缝分布细而密,NC板裂缝分布宽而粗;相比平钢腹板,波形钢腹板可提高组合梁桥面板的开裂荷载;波形钢腹板-UHPC组合梁的下翼缘板受压应变强化效应较平钢腹板-UHPC组合梁更加显著,二者负弯矩区极限抗弯承载力接近;桥面板采用UHPC相比NC开裂荷载可提高1倍,且初始抗弯刚度可提高43%;相比塑性屈服理论,所提出的波形钢腹板-UHPC组合梁负弯矩区极限抗弯承载力计算方法计算的极限抗弯承载力与试验值更接近,可以用于工程估算中。Based on an existing girder bridge with steel I girders and concrete panels,the 1∶10 scale composite girder specimens,including a group of composite girders with corrugated steel webs and UHPC deck panels,a group of composite girders with flat webs and UHPC deck panels,and a group of composite girders with corrugated steel webs and normal concrete(NC)deck panels,were prepared for three-point bending tests.The influence of types of webs and deck panel strength on the failure mode of the hogging moment zones,crack distribution feature,and ultimate flexural strength of the composite girders,was analyzed,and the method to calculate the ultimate flexural strength of the bending moment zones in the composite girders with corrugated steel webs and UHPC deck panels was proposed.It is shown that the composite girders in all the three groups reveal typical flexural failure.The cracks in the UHPC deck panels are narrow and dense,while those in the NC deck panels are wide and sparse.Compared with the flat webs,the corrugated steel webs can improve the cracking resistance of the deck panels.The compressive strain-hardening effect in the bottom flange of the composite girders with corrugated steel webs and UHPC deck panels is more significant than that in the composite girders with flat webs and UHPC deck panels,but the ultimate flexural strengths in the hogging moment zones of the two are close.The girders with UHPC deck panels exhibit cracking resistance that is two times of that of girders with NC deck panels,and the initial flexural stiffness is improved by 43%.Compared with the plastic yielding theory,the proposed method that considers the compressive strain-hardening effect in the bottom flange generates the ultimate flexural strengths that approximate the test values,which can be used for engineering estimation.

关 键 词：装配式梁桥 工字钢-混组合梁桥 波形钢腹板-UHPC组合梁 负弯矩区 开裂荷载 抗弯承载力 刚度 三点弯曲试验 

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