压弯扭作用下新型承插装配式桥墩的抗震性能

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (12) : 118-130.

论文

夏樟华1，谢君1，范千1，陈金盛2，林元铮3

作者信息 +

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

XIA Zhanghua1，XIE Jun1，FAN Qian1，CHEN Jinsheng2，LIN Yuanzheng3

Author information +

文章历史 +

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，四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，四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它三个墩。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实验依据。

Abstract

In order 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 discussed its application feasibility in shallow socket connection. 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 is 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 has a good ability to resist compression, bending and torsional loads, and can realize shallow socket connections. The research results can provide an experimental basis for the application of fabricated piers under the combined action of compression, bending and torsion.

导出引用

夏樟华1，谢君1，范千1，陈金盛2，林元铮3. 压弯扭作用下新型承插装配式桥墩的抗震性能[J]. 振动与冲击, 2024, 43(12): 118-130

XIA Zhanghua1，XIE Jun1，FAN Qian1，CHEN Jinsheng2，LIN Yuanzheng3. Seismic performance of a precast pier with novel socket connection under the compound effect of compression-flexure-torsion[J]. Journal of Vibration and Shock, 2024, 43(12): 118-130

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