预应力GFRP筋-不锈钢筋混合配筋预制节段桥墩抗震试验  

Seismic Tests of Post-tensioned Segmental Bridge Columns with Hybrid Reinforcements of Prestressed GFRP and Stainless Rebars

作　　者：贾俊峰[1] 张凯迪 陈梦圆 程寿山[2] 赵建瑜 邓贺丹 JIA Jun-feng;ZHANG Kai-di;CHEN Meng-yuan;CHENG Shou-shan;ZHAO Jian-yu;DENG He-dan(National Key Laboratory of Bridge Safety and Resilience,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Transportation Industry for Old Bridge Detection and Reinforcement Technology(Beijing),Institute of Highway Science,Ministry of Transport,Beijing 100088,China;China ENFI Engineering Corp.,Beijing 100038,China)

机构地区：[1]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [2]交通运输部公路科学研究院旧桥检测与加固技术交通行业重点实验室(北京),北京100088 [3]中国恩菲工程技术有限公司,北京100038

出　　处：《中国公路学报》2025年第1期144-157,共14页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52178449);北京市自然科学基金项目(8234060)。

摘　　要：为解决沿海侵蚀环境下装配式节段桥墩钢筋易锈蚀以及强震后桥梁墩柱残余位移大的问题,提出一种配置不锈钢筋和无黏结预应力GFRP筋的混合配筋预制节段拼装混凝土桥墩。通过拟静力试验揭示了混合配筋桥墩的破坏模式,分析了桥墩的滞回性能、承载力、耗能、残余位移、预应力变化、刚度退化、钢筋应变和接缝开口等抗震性能参数,并与有黏结无初始预应力GFRP筋的混合配筋节段拼装桥墩抗震性能进行了对比分析。研究结果表明:对无黏结GFRP筋施加50%墩顶竖向重力的预紧力,试件残余位移可减小近40%,但峰值承载力降低了20%左右;增加GFRP筋的配筋率,同时减小不锈钢筋的配筋率,试件残余位移可减小38%,承载力减小10%;墩顶竖向轴压比即P-Δ效应对墩底最大弯矩的影响更明显。合理设计无黏结预应力GFRP筋的初始张拉力和配筋率,同时考虑GFRP筋的极限拉伸应变影响,可使桥墩具有与有黏结预应力GFRP筋桥墩的水平承载力基本一致,但可大幅降低预制节段墩柱的残余位移。To solve the problems of easy rusting of assembled segmental pier reinforcements in coastal erosion environments and large residual displacements of bridge piers after strong earthquakes,hybrid reinforced precast segmental assembled concrete piers with stainless steel reinforcement and unbonded prestressed glass fiber-reinforced polymer(GFRP)bars are proposed.The damage modes of the hybrid-reinforced piers were revealed through the proposed static tests.In addition,the seismic performance parameters including hysteresis performance,bearing capacity,energy dissipation,residual displacement,prestressing change,stiffness degradation,rebar strain,and joint opening of the piers were analyzed and compared with the seismic performance of the hybrid-reinforced segmental-assembled piers with bonded non-initial prestressed GFRP tendons.The results show that the unbonded GFRP reinforcement applied 50%of the vertical axial compression ratio of the top of the pier preload,and the residual displacement of the specimen could be reduced by nearly 40%;however,the peak bearing capacity was reduced by approximately 20%.With an increase in the reinforcement rate of the GFRP reinforcement and a reduction in the reinforcement rate of the stainless-steel reinforcement,the residual displacement of the specimen was reduced by 38%,and the bearing capacity was reduced by 10%.The vertical axial pressure ratio at the top of the pier,i.e.,the effect of P-Δeffect on the maximum bending moment at the bottom of the pier,is more apparent.With sufficient initial tensile force and reinforcement rate of unbonded prestressed GFRP tendons,while considering the influence of the ultimate tensile strain of GFRP tendons,the same horizontal bearing capacity as the bonded case can be achieved,but the residual displacement of the pier column can significantly reduce.

关 键 词：桥梁工程 预制节段桥墩 抗震性能 预应力GFRP筋 不锈钢筋 混合配筋 

分 类 号：U443.2[建筑科学—桥梁与隧道工程]