钢板-UHPC组合腹板抗剪性能试验  

Experiment on Shear Performance of Steel-UHPC Composite Web

作　　者：邵旭东[1,2] 刘淦 李盼盼 涂磊 SHAO Xu-dong;LIU Gan;LI Pan-pan;TU Lei(School of Civil Engineering,Hunan University,Changsha 410082,Hunan,China;State Key Laboratory of Bridge Engineering Safety and Resilience,Hunan University,Changsha 410082,Hunan,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学桥梁工程安全与韧性全国重点实验室,湖南长沙410082

出　　处：《中国公路学报》2025年第3期303-316,共14页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52038003,52378236);交通运输部重点科技项目(2022-MS5-124);湖南省研究生科研创新项目(QL.20230105)。

摘　　要：为了研究钢内芯-UHPC组合箱梁的抗剪性能,通过三点加载的方式对5个钢板-UHPC组合腹板试件进行试验测试,采用DIC对试件的裂纹演变全过程进行观测,分析了配箍率和钢腹板高度占比对组合腹板抗剪性能的影响。试验结果表明:纯UHPC腹板、半钢+UHPC组合腹板、全钢+UHPC组合腹板发生剪切破坏,配箍筋UHPC腹板、全钢+配箍UHPC组合腹板发生弯曲破坏;钢腹板高度占比的提高对钢板-UHPC组合腹板剪切性能有着显著影响,当钢腹板高度从0增加到300、600 mm时,组合腹板的极限承载力分别提升了9.3%、57.6%;增配箍筋能够有效抑制腹板斜裂缝的发展,使组合腹板的破坏模式从剪切破坏向弯曲破坏转变。基于材料力学理论,提出了钢板-UHPC组合腹板开裂荷载的计算方法,所得计算值与试验值相对误差的平均值在6%以内。基于法国规范计算的剪切破坏组合腹板抗剪承载力与试验值相对误差为3%~13%。研究结果可为钢内芯-UHPC组合箱梁的设计与工程应用提供参考。The shear performance of a steel inner core-UHPC composite box girder was studied by testing five steel-UHPC composite web specimens by three-point loading.We observed the entire process of crack evolution using DIC and analyzed the effects of the stirrup ratio and the height of the steel web on the shear resistance of the composite web.The test results showed that the pure UHPC,semi-steel-UHPC,and full-steel-UHPC webs underwent shear failure,whereas the UHPC web with stirrups and the full-steel-UHPC web underwent flexural failure.The height increase of the steel web affected the shear performance of the steel-plate-UHPC web significantly.When the steel web height increased from 0 to 300 and 600 mm,the ultimate bearing capacity of the composite web increased by 9.3%and 57.6%,respectively.The additional stirrup effectively inhibited the development of diagonal cracks in the web,so that the failure mode of the composite web changed from shear to a much more ductile flexural failure mode.According to the proposed theoretical formula for the cracking load of the steel-plate-UHPC composite web,the average relative error between the calculated and test values was within 6%.The shear capacity of shear-damaged composite webs calculated based on the French code had a relative error of 3%-13%with respect to the test values.These results provide a reference for the design and engineering application of steel inner core-UHPC composite box girders.

关 键 词：桥梁工程 钢内芯-UHPC组合箱梁 试验研究 钢板-UHPC组合腹板 超高性能混凝土 抗剪性能 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]