灌浆套筒连接预制装配桥墩剪切行为研究  

Investigation on shear behavior of precast assembled column connected with grouting sleeve

作　　者：张新宇 ZHANG Xinyu(Zhong Jiao Jian Ji Jiao Highway Investment Development Co.Ltd.,Shijiazhuang 050000,China)

机构地区：[1]中交建冀交高速公路投资发展有限公司,河北石家庄050000

出　　处：《世界地震工程》2024年第4期98-111,共14页World Earthquake Engineering

基　　金：半灌浆套筒连接预制拼装桥墩抗震性能研究课题。

摘　　要：预制装配桥梁技术采用新型施工技术和连接形式,是未来桥梁工程的发展方向。灌浆套筒连接作为预制装配桥墩节点的常用连接方式,为研究其地震作用下的剪切行为,采用1∶4缩尺比,设计剪跨比为2.50和1.75的灌浆套筒连接桥墩节点试件。通过开展低周循环荷载试验,揭示桥墩地震失效机理,并探究不同剪跨比对其抗震性能的影响规律。同时,建立有限元模型来预测灌浆套筒连接节点的抗震性能。研究结果表明:试件失模式均为拼接缝灌浆料受压破坏后,墩柱纵向钢筋断裂,增大剪跨比可增大墩柱底部混凝土的损伤;对比耗能能力、刚度退化以及延性性能表明了试件良好的抗震性能,所建立的有限元模型可以精确预测套筒连接试件的损伤发展和滞回曲线。本文研究可为低剪跨比灌浆套筒连接预制装配桥墩的应用提供技术参考。Prefabricated bridge technology adopts new construction technology and connection form,which is the development direction of future bridge engineering.Grouting sleeve connection is a common connection method for prefabricated bridge pier joints.In order to ascertain its shear behavior under earthquake action,this paper adopts a scale ratio of 1∶4 and designed grouting sleeve connection pier joints with shear-span ratios of 2.50 and 1.75.By carrying out low-cycle cyclic load tests,the mechanism of seismic failure of bridge piers was revealed,and the influence of different shear-span ratios on their seismic performance was explored.A finite element model was also established to predict the seismic performance of grouted sleeve connection nodes.The research shows that the failure mode of the specimens is that after the joint grouting material was damaged under compression,the longitudinal reinforcement of the pier column fractured,and increasing the shear-span ratio can increase the damage of the concrete at the bottom of the pier column.The comparisons of energy dissipation capacity,stiffness degradation and ductility performance show that the sleeve connection specimen has good seismic performance.The established finite element model can accurately predict the damage development and hysteresis curve of sleeve connection specimens.The research in this paper can provide technical reference for the application of low shear-span ratio grouting sleeves connecting prefabricated piers.

关 键 词：桥梁工程 预制装配桥墩 灌浆套筒 拟静力试验 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]