压弯扭作用下新型承插装配式桥墩的抗震性能  

Seismic performance of a precast pier with novel socket connection under the compound effect of compression-flexure-torsion

作　　者：夏樟华[1] 谢君 范千[1] 陈金盛 林元铮 XIA Zhanghua;XIE Jun;FAN Qian;CHEN Jinsheng;LIN Yuanzheng(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Provincial Institute of Transportation Planning and Design Co.,Fuzhou 350001,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]福州大学土木工程学院,福州350108 [2]福建省交通规划设计研究院有限公司,福州350001 [3]东南大学土木工程学院,南京210096

出　　处：《振动与冲击》2024年第12期118-130,共13页Journal of Vibration and Shock

基　　金：国家自然科学基金(51408360,52008187);福建省自然科学基金(2020J1477);福建省交通科技发展项目(2022)。

摘　　要：为明确并提升承插式拼装桥墩抵抗压弯扭等复合荷载的能力,提出了一种结合灌浆套筒和承插口组合连接的新型承插装配式墩,通过复合荷载作用下的拟静力试验对比了现浇(reinforced concrete,RC)、灌浆套筒(grouting and sleeve,GS)、承插口(socket with ultra-high performance concrete,SU)和结合套筒连接钢筋的新型承插(grouting sleeve and socket with ultra-high performance concrete,GSU)连接拼装桥墩的损伤机理和滞回性能,结合有限元模型重点讨论了承插口深度对滞回性能的影响。结果表明:4个构件的破坏模式都是以受弯破坏为主的弯扭破坏,其中SU构件出现了轻微拔起的现象,而对应的GSU构件并未出现该现象,与RC构件接近;各构件的剪力-墩顶位移骨架发展趋势比较一致,由于GSU构件纵向钢筋连续,具有更好的整体性能,其抗弯承载力与RC构件接近,且明显大于SU和GS构件,4个构件弯曲滞回耗能较为接近;承插口深度为1.0倍截面宽度的GSU构件抗扭承载力略高于RC构件,且明显大于其余装配式墩,GSU构件的扭转刚度、延性系数和耗能能力均大于其他3个墩;当承插口深度采用0.5倍构件截面宽度时,新型承插GSU构件的抗弯和抗扭承载力均略高于整体现浇构件,具有良好的抵抗压弯扭荷载的能力,可以实现浅承插口连接。研究结果可为压弯扭复合作用下装配式墩的应用提供试验依据。To clarify and improve the ability of fabricated piers with socket connection to resist composite loads such as compression,bending and torsion,a novel socket connection method for prefabricated piers combining grouting sleeves and sockets was proposed for application in ordinary cap.The damage characteristics and hysteresis energy dissipation performance of cast-in-place piers,fabricated piers with grouting sleeves,fabricated piers with sockets and fabricated piers with novel socket connection through quasi-static tests under compound loads,and the effect of socket height on hysteresis performance was analyzed with numerical simulation,and its application feasibility in shallow socket connection was discussed.The results show that the failure modes of the four specimens are the bending-torsional failures dominated by bending failure,among which the SU specimen has a slight phenomenon of pulling up,while the corresponding GSU specimen does not have this phenomenon,which is close to the RC specimen.The development trend of the shear force-pier top displacement skeleton curves of each specimen is relatively consistent.Due to the longitudinal steel bar of the GSU specimen is continuous,it has better overall performance,and its flexural load capacity is close to that of RC specimen,and is significantly larger than that of SU and GS specimens.The bending hysteresis energy consumption of the four specimens is relatively close.The torsional bearing capacity of the GSU specimen with the depth of the socket is 1D and slightly higher than that of the RC specimen,and is significantly greater than that of other fabricated pier specimens.The torsional stiffness,ductility coefficient and energy dissipation capacity of the GSU specimen are greater than that of the other three piers.When the depth of the socket is 0.5 times the cross-section width of the specimen,the flexural bearing capacity and torsional bearing capacity of the specimen with novel socket connection are higher than that of the cast-in-place RC specimen,which ha

关 键 词：桥梁工程 新型承插 拟静力试验 节段拼装桥墩 压弯扭作用 浅承插口 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U443.22[交通运输工程—道路与铁道工程]