带波形钢板的UHPC免模板湿接缝抗弯模型试验研究  

Experimental Study on UHPC Formwork⁃free Wet Joint Bending Resistance Model with Corrugated Steel Web

作　　者：黄心仪 李立峰[1,2] 王连华 王哲宇[1] 蒋德松 HUANG Xinyi;LI Lifeng;WANG Lianhua;WANG Zheyu;JIANG Desong(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Changsha 410082,China;Hunan Huda Civil Engineering and Architecture Engineering Inspection Co.Ltd.,Changsha 410036,China.)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]风工程与桥梁工程湖南省重点实验室,长沙410082 [3]湖南湖大土木建筑工程检测有限公司,长沙410036

出　　处：《铁道建筑》2024年第1期7-13,共7页Railway Engineering

基　　金：国家自然科学基金(52278176,51978257)。

摘　　要：针对预制装配式桥梁中桥面板湿接缝处的受力特点和现有接缝构造形式,提出一种以预埋波形钢板为底模的超高性能混凝土(Ultra-High Performance Concrete,UHPC)免模板湿接缝构造形式,解决接缝现场支模问题。为研究新型接缝的力学性能,设计了5片试验梁,以钢纤维含量为试验参数,开展四点弯曲全过程抗弯性能试验。结果表明:各试验梁主裂缝均位于预制段,发生弯曲破坏,接缝段未产生较大破坏;提高钢纤维含量可以增强UHPC-NC(Normal Concrete)界面黏结,提升接缝的抗裂性能,但对结构的抗弯承载力影响较小;钢纤维含量为1.0%的免模板接缝梁抗裂性能仅次于UHPC整体梁,同时具有结构简单、施工简化、造价经济等优点,说明该接缝构造形式运用于实际工程中是可行和可靠的;UHPC钢纤维含量建议取1.0%。According to the force characteristics of bridge deck slabs at wet joints in prefabricated bridges and the existing joint construction forms,a ultra-high performance concrete(UHPC)formwork-free wet joint construction form with embedded corrugated steel web(CSW)as the bottom formwork was proposed to solve the problem of on-site formwork support for joints.In order to study the mechanical properties of the new type of joint,five test beams were designed to carry out four-point bending full-process bending performance test with steel fiber content as the test parameter.The results show that the main cracks of each test beam are located in the prefabricated section,and bending failure occurs.There is no significant damage in the wet joint area.The increase of steel fiber content can enhance the UHPC-NC(normal concrete)interfacial bond and improve the crack resistance of joint,but it has little impact on the bending bearing capacity of the structure.The crack resistance performance of the formwork-free joint beam with a steel fiber content of 1.0%is second only to UHPC integral beam,and it has the advantages of simple structure,simplified construction,and economical cost.The results indicate that the joint construction form is feasible and reliable in practical engineering.It is recommended to use UHPC with a steel fiber content of around 1.0%.

关 键 词：公铁两用桥梁 超高性能混凝土 弯曲性能试验 预制桥面板 湿接缝 抗裂性能 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]