一种新型预制桥墩连接构造的抗剪试验研究  

Experimental Study on Shear Resistance of a New Prefabricated Pier Connection Structure

作　　者：胡志坚[1] 鲍安 HU Zhi-jian;BAO An(School of Transportation,Wuhan University of Technology,Wuhan Hubei 430063,China)

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《公路交通科技》2023年第1期125-135,共11页Journal of Highway and Transportation Research and Development

基　　金：国家重点研发专项项目(2017YFC0806000);江西省创新驱动“5511”项目(20165ABC28001);江西省交通科技项目(2017C0005)。

摘　　要：为提高预制桥墩节段连接构造的力学性能和施工效率,提出了应用于预制桥墩节段间的灌浆波纹管与榫卯结构相结合的新型连接形式。为验证新型连接结构的可靠性,探究其剪切破坏机理,探明影响其抗剪强度的因素,提出了优化设计及施工建议,并设计了5组新型接头试件进行剪切试验。试验参数包括截面形状,采用波纹管或半灌浆套筒连接钢筋。研究了施工累积误差对波纹管灌浆连接构造抗剪性能的影响,得到了各组试件的变形、抗剪承载力以及破坏模式,并将各组试验数据及现象进行了对比分析。结果表明:新型连接构造在受剪作用下,发生整体斜剪破坏,各控制界面均表现出足够的连接强度,具有良好的抗剪承载力以及较好的整体性;方榫与圆榫相比,装配定位更加精确,拼装效率更高;半灌浆套筒能够提高接头的整体刚度,但破坏较为突然,且在受剪条件下的连接性能不佳;因施工累积误差造成的波纹管底部无钢筋区段会形成薄弱段,从而改变接头受剪破坏模式,显著降低其抗剪强度,为提高波纹管连接安装精度,建议在没有相关工程经验的条件下,构件预留钢筋的长度制作时应比连接所需长度长0~5 mm,预拼装时可再通过调平层实现误差容错;凹槽壁厚和纵向连接钢筋强度是影响新型连接抗剪强度的主要因素。In order to improve the mechanical properties and construction efficiency of prefabricated pier segment connection, a new connection form between the grouting bellow and mortise-and-tenon joint applied to prefabricated pier segments is proposed. In order to verify the reliability of the new connection structure, explore its shear failure mechanism and find out the factors affecting its shear strength, the optimization design and construction suggestions are proposed, 5 groups of new connection specimens are designed for shear test. The experimental parameters include cross-section shape. The steel bars are connected with bellow or semi grouting sleeve. The influence of construction cumulative error on the shear performance of the bellow grouting connection structure is studied. The deformation, shear capacity and failure mode of each group of specimens are obtained, and the test data and phenomena of the groups are compared and analyzed. The result shows that(1) The new connection structure is subject to overall oblique shear failure under the action of shear, and each control interface shows sufficient connection strength, which has good shear bearing capacity and good integrity.(2) Compared with the round tenon, the assembly positioning of square tenon is more accurate and its assembly efficient is higher.(3) The semi grouting sleeve can improve the overall stiffness of the connections, but the failure is sudden and the connection performance is poor under the shear condition.(3) The segment without reinforcement at the bottom of the bellows caused by the cumulated construction error will form a weak segment, which will change the shear failure mode of the connection and significantly reduce its shear strength. In order to improve the installation accuracy of bellow connection, it is suggested that, without relevant engineering experience, the length of reserved reinforcement of the element should be 0-5 mm longer than the required length of connection during fabrication, and the error tolerance can be realized

关 键 词：桥梁工程 榫卯连接 剪切试验 预制拼装桥墩 灌浆波纹管 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]