摘要
无黏结预应力技术是实现桥梁结构自复位的主要途径,但无黏结预应力技术存在施工复杂、预应力损失和加重主体结构受力负担的难题。此研究提出一种自复位钢筋接头(self-centering rebar splices,SRS),用SRS连接钢筋混凝土双柱式桥墩摇摆界面纵筋,建立了分散自复位钢筋混凝土双柱式桥墩结构。SRS由预压碟簧提供自复位力,建立了SRS刚度、预紧力和有效行程计算模型,并通过SRS力学性能试验验证了模型的准确性;分别建立了预应力自复位双柱式桥墩和分散自复位双柱式桥墩的数值仿真模型,在低周往复荷载作用下,对比分析了预应力自复位双柱式桥墩和分散自复位双柱式桥墩的承载力、耗能能力和残余变形,结果表明分散自复位双柱式桥墩承载力和耗能能力远大于预应力自复位双柱式桥墩,残余位移略大于预应力双柱式桥墩;对分散自复位双柱式桥墩抗震性能开展了参数分析,研究了混凝土强度、配筋率、接头预紧力和有效行程对分散自复位双柱式桥墩抗震能力的影响规律。结果表明,配筋率提高可增强分散自复位双柱式桥墩承载力和耗能能力,SRS预紧力与桥墩自复位激活力成正比,有效行程增加能增强桥墩的变形能力、降低残余位移。
Unbonded prestressing technology is a primary approach to achieve self-centering of bridge structures.However,this technology is confronted with challenges such as complex construction processes,prestress loss,and increased stress burden on the main structure.This study proposes a self-centering rebar splice(SRS).The SRS serves to link the longitudinal reinforcement at the rocking interfaces of reinforced concrete double-column pier.Through this connection,a self-centering reinforced concrete double-column pier structure was formed.Firstly,the SRS mechanical model was established,which is validated through experimental tests.Numerical simulation models of the prestressed self-centering rocking double-column pier and the decentralized self-centering reinforced concrete double-column pier were established respectively.Through the analysis of low cycle loads,compared with the prestressed self-centering rocking double-column pier,the carrying capacity and energy dissipation of decentralized self-centering double-column pier were significantly improved,and the residual drift ratio is only 0.13%,indicating good self-centering performance.Numerical analyses were conducted to investigate the influence of concrete strength,reinforcement ratio,SRS pre-tension force and SRS effective stroke on the mechanical properties of replaceable external monotonic unidirectional energy dissipation devices for structures under low cycle loads.The findings demonstrate that when other parameters remain constant,within the same loading mode,an increase in the reinforcement ratio leads to an enhancement of both the lateral stiffness and energy-dissipating capacity;SRS pre-tension force is directly proportional to the activation force;increasing the effective stroke can enhance the deformation capacity and reduce the residual displacement.
作者
吕杨
王一冰
杜春雨
郑庆涛
LÜYang;WANG Yibing;DU Chunyu;ZHENG Qingtao(Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin Chengjian University,Tianjin 300384,China)
出处
《振动与冲击》
北大核心
2025年第24期209-218,共10页
Journal of Vibration and Shock
基金
国家自然科学基金(52178295)
天津市自然科学基金(24JCZDJC00140)
天津市青年科技人才(第一层次)。
关键词
双柱式桥墩
分散自复位
钢筋接头
试验
数值模拟
double-column pier
decentralized self-centering
rebar splice
experiment
numerical simulation
