“灌浆套筒+预应力筋”混合连接预制装配桥墩拟静力试验研究  

Experimental study on quasi-static of prefabricated and assembled bridge pier with"grouting sleeve+prestressing tendons"hybrid connection

作　　者：陈亮 郭敏 侯文崎[2] 余韬 张玉果 国巍[2,4] CHEN Liang;GUO Ming;HOU Wenqi;YU Tao;ZHANG Yuguo;GUO Wei(Guangzhou Metro Design&Research Co.Ltd.,Guangzhou 510000,China;School of Civil Engineering,Central South University,Changsha 410075,China;China Chengda Engineering Co.Ltd.,Chengdu 610041,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广东广州510000 [2]中南大学土木工程学院,湖南长沙410075 [3]中国成达工程有限公司,四川成都610041 [4]高速铁路建造技术国家工程研究中心,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2024年第10期3814-3832,共19页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51878674);广州地铁设计研究院股份有限公司科技研究开发计划项目(KY-2019-064)。

摘　　要：灌浆套筒是目前预制装配桥墩常用连接方式,承载能力高,但残余位移大,自恢复能力和延性不足。为解决该问题,提出“灌浆套筒+预应力筋”混合连接方式,并应用于预制装配桥墩。以某轨道交通高架桥梁为工程背景,考虑不同连接方式,设计制作3个缩尺比为1:3的桥墩试件,进行拟静力试验和数值仿真分析,开展“灌浆套筒+预应力筋”混合连接预制装配桥墩的抗震性能研究。研究结果表明,相比于灌浆套筒连接和现浇连接,混合连接预制装配桥墩的开裂荷载分别提升了56.1%和79.4%,自恢复能力优势显著,残余位移分别为前二者的45.3%和58.7%,峰值荷载与灌浆套筒连接桥墩接近,但耗能能力较前二者弱,极限位移状态下的耗能能力约为现浇连接桥墩的84%。相比于灌浆套筒连接桥墩,混合连接桥墩墩身塑性铰略有上移,墩身塑性损伤范围略大,预应力筋与墩身混凝土之间的相对滑移是导致混合连接桥墩耗能能力下降的关键原因,极限位移状态下最大相对滑移达7.1 mm,发生在距墩底2000 mm处。从承载能力、位移延性、自恢复能力等方面考虑,针对轨道交通桥梁,“灌浆套筒+预应力筋”混合连接预制装配桥墩具有较好的应用价值,但预应力设计时应以对称分散布置为宜,且预应力初拉力不宜过大。Grouting sleeve is currently a commonly used connection method for prefabricated bridge piers,with high bearing capacity,but large residual displacement,insufficient self recovery ability and ductility.To address this issue,a hybrid connection of"grouting sleeve+prestressing tendons"was proposed for the application of prefabricated bridge piers.Taking a certain rail transit elevated bridge as the engineering background and considering different connection methods,three 1:3 scaled bridge pier specimens were designed and produced,the quasi-static tests and numerical simulation analysis were completed,and the seismic performance of prefabricated and assembled bridge pier with"grouting sleeve+prestressing tendons"hybrid connection were researched.The results show that compared to the grouting sleeve connection and cast-in-place connection,the cracking load of the hybrid connection prefabricated assembly bridge pier increases by 56.1%and 79.4%,respectively.The self recovery ability advantage is significant,and the residual displacement is 45.3%and 58.7%of the first two.The peak load is similar to the grouting sleeve connection bridge pier,but the energy dissipation capacity is weaker than that of the first two.The energy dissipation capacity in the ultimate displacement state is about 84%of the cast-in-place connection bridge pier.Compared to the grouted sleeve connected piers,the plastic hinge of the pier body of the hybrid connected piers slightly moves upwards,and the plastic damage range of the pier body is slightly larger.The relative slip between the prestressed reinforcement and the concrete of the pier body is the key reason for the decrease in energy dissipation capacity of the hybrid connected piers.The maximum relative slip in the ultimate displacement state is 7.1 mm,which occurs at a distance of 2000 mm from the bottom of the pier.From the aspects of bearing capacity,displacement ductility,and self recovery ability,the prefabricated and assembled bridge pier with"grouting sleeve+prestressing tendons"hybri

关 键 词：混合连接 预制装配桥墩 抗震性能 墩身截面曲率 相对滑移 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]