UHPC加固空心板梁现场足尺抗弯试验研究  

Field Full-scale Experimental Study on Flexural Behavior of Hollow Slab Girder Strengthened by Ultra-high Performance Concrete

作　　者：王连华[1] 龚志权 李立峰[1] 孙秀贵 黄哲标 吴焕征 WANG Lianhua;GONG Zhiquan;LI Lifeng;SUN Xiugui;HUANG Zhebiao;WU Huanzheng(College of Civil Engineering,Hunan University,Changsha 410082,China;Jiangxi Communications Design and Research Institute Co.,Ltd.,Nanchang 330022,China;Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd.,Changsha 410008,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]江西省交通设计研究院有限责任公司,江西南昌330022 [3]湖南省交通规划勘察设计院有限公司,湖南长沙410008

出　　处：《湖南大学学报（自然科学版）》2024年第9期15-23,共9页Journal of Hunan University:Natural Sciences

基　　金：长沙市自然科学基金资助项目(KQ2202133);湖南省自然科学基金资助项目(2023JJ30152);湖南省企业科技创新创业团队支持计划资助项目(2020)。

摘　　要：为分析UHPC加固受损空心板梁的抗弯性能,设计制作了2片空心板梁以开展现场足尺抗弯试验研究.基于现场试验结果对比分析了未加固和加固空心板梁的破坏模式和荷载-跨中位移曲线.试验结果表明UHPC加固层可以有效改善受损空心板梁的破坏模式,并且加固空心板梁呈现出更好的抗弯和变形能力.与未加固空心板梁相比,加固空心板梁的开裂和极限荷载均得到明显提升,提升幅度分别达到11.5%和23.8%.此外讨论了UHPC层的加固机理,同时推导了加固空心板梁的抗弯极限承载能力公式,并将理论值与试验值进行对比.结果表明抗弯承载能力计算值和试验值的最大误差仅为1.1%,证明了理论公式的准确性.To investigate the flexural performance of damaged hollow slab girders strengthened with UHPC,two hollow slab girders were designed and fabricated to perform the field full-scale experiments,and the failure modes and load-mid span deflection behavior of the unreinforced/reinforced girder were analyzed based on the comparison of field testing results.The experiment results show that the UHPC layer can effectively improve the failure mode of the damaged hollow slab girder,and the reinforced girder exhibits good flexural and deflection capacities.Compared with the unreinforced girder,the cracking and ultimate loads of the reinforced girder are increased by 11.5%and 23.8%,respectively.Moreover,the reinforcement mechanism of the UHPC layer was discussed,and the theoretical formulas were derived to determine the ultimate bending moment of the reinforced girder,and the theoretical values were compared with the experimental results.The results show that the error between the calculated values and experimental ones is only 1.1%,which verifies the accuracy of the theoretical formulas.

关 键 词：超高性能混凝土 空心板梁 加固 现场足尺试验 破坏模式 抗弯承载能力 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]