摘要
为了更好地适应灌浆套筒装配式桥墩工业化建造,明确该新型墩连接部位关键设计参数对其抗震性能的影响。首先利用拟静力试验与数值分析进行验证,随后通过ABAQUS软件建立精细化装配式桥墩实体有限元模型对桥墩进行低周往复加载数值模拟仿真分析。分别从滞回特性、耗能特性和损伤发展等方面评估该装配式墩的抗震性能,与现浇墩进行对比,并探究套筒长度和钢筋直径对其抗震性能的影响。结果表明:试验所得桥墩变形系数与数值模拟所得数据基本接近,最大误差为6.2%,且桥墩最先出现损伤的部位位于灌浆套筒上方区域;现浇桥墩的最易损部位为墩底,而装配式墩的最易损部位为灌浆套筒顶部区域;装配式墩水平极限承载力和耗能能力均大于现浇墩,但残余位移比现浇墩更大,装配式墩水平承载力比现浇墩大6%,但现浇墩达到水平极限承载力的位移比装配式墩大20 mm,现浇墩累积耗散的能量比装配式墩小22.5%,最大残余位移比装配式墩小22.6%;套筒长度由60 mm增至120 mm时,装配式墩的水平极限承载力和耗散的能量分别最大增大10.5%、16.21%,而残余位移则减小17.86%;增大钢筋直径可有效提高装配式墩的水平极限承载力和耗能能力,但残余位移也会变大。
To better adapt to the industrialized construction of grouted sleeve assembled bridge piers,this study aims to clarify the influence of key design parameters at the connection area of this new pier type on its seismic performance.First,pseudo-static tests and numerical analysis were used for verification.Subsequently,a refined solid finite element model of the assembled pier was established using ABAQUS software for the numerical simulation analysis under low-cycle reversed loading.The seismic performance of the assembled pier was evaluated in terms of hysteresis behavior,energy dissipation capacity,and damage development.It was compared with the cast-in-place pier,and the effects of sleeve length and steel bar diameter on its seismic performance were investigated.The results showed that the deformation coefficient of the test pier was basically close to that obtained from numerical simulation,with a maximum error of 6.2%.Moreover,the first damage occurred in the area above the grouted sleeve.The most vulnerable location of the cast-in-place pier was the pier bottom,while that of the assembled pier was the area at the top of the grouted sleeve.The horizontal ultimate bearing capacity and energy dissipation capacity of the assembled pier were both greater than those of the cast-in-place pier,but the residual displacement of the assembled pier was larger.Specifically,the horizontal ultimate bearing capacity of the assembled pier was 6% greater than that of the cast-in-place pier.However,the displacement at which the cast-in-place pier reached its horizontal ultimate bearing capacity was 20 mm greater than that of the assembled pier.The cumulative dissipated energy of the cast-in-place pier was 22.5% lower than that of the assembled pier,and its maximum residual displacement was 22.6% smaller than that of the assembled pier.When the sleeve length increased from 60 mm to 120 mm,the horizontal ultimate bearing capacity and the dissipated energy of the assembled pier increased by up to 10.5% and 16.21%,respectively,while the residual displacement decreased by 17.86%.Increasing the steel bar diameter could effectively improve the horizontal ultimate bearing capacity and energy dissipation capacity of the assembled pier,but it also led to an increase in the residual displacement.
作者
史修朋
SHI Xiupeng(Zhengzhou Design Institute,China Railway Engineering Design and Consulting Group Co.,Ltd.,Zhengzhou 450001,China)
出处
《铁道标准设计》
北大核心
2025年第12期95-103,共9页
Railway Standard Design
基金
中铁工程设计咨询集团有限公司科技开发课题(研2023-17)。
关键词
装配式桥墩
抗震性能
灌浆套筒
套筒长度
钢筋直径
有限元模型
assembled bridge pier
seismic performance
grouted sleeve
sleeve length
steel bar diameter
finite element model
