首页|榫卯-承插装配式桥墩抗震性能研究

榫卯-承插装配式桥墩抗震性能研究

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承插式连接施工便捷,容许误差大,但耐久性较差.为提升施工质量和优化耐久性,结合超高性能混凝土(ultra-high performance concrete,UHPC)湿接缝连接技术,提出一种新型装配式桥墩——榫卯-承插装配式桥墩.设计制作 1 个榫卯-承插装配式桥墩试件和 1 个对比桥墩试件(整体现浇桥墩),采用拟静力试验方法,结合数值模拟研究该装配式试件的破坏机理和抗震性能.研究结果表明:在试验加载过程中,两试件破坏形式都是以弯曲破坏为主的延性破坏,主要表现为墩底塑性铰区混凝土大量压溃剥落,而装配式连接处承台及灌浆料的破坏较小,且在达到极限荷载时装配式试件残余变形仅为整体现浇试件的 79.09%,表明UHPC灌浆料可提升桥墩损伤容限,使其震后更易修复;榫卯-承插装配式试件采用较短的承插深度及钢筋搭接长度达到可靠的连接效果,在相同滞回位移下表现出等同现浇桥墩的承载力、延性、耗能能力和刚度;承插深度在0.4D(D为试件截面宽度)及以上时,接缝处连接可靠,整体性和抗震性能基本等同现浇;提高灌浆料弹性模量对桥墩刚度具有改善效果;纵筋直径对桥墩抗震性能的影响比承台搭接钢筋的影响更显著,增大纵筋配筋率对水平承载力和耗能能力的提升较为明显,但会增加桥墩残余变形.
Research on seismic performance of tenon-socket prefabricated bridge pier
The socket connection is convenient in construction and has a large tolerance error,but the durability is poor.In order to improve the construction quality and optimize the durability,we proposed a new type of assembled bridge pier tenon-socket prefabricated bridge per by combining the wet joint connection technology of ultra-high performance concrete(UHPC).One tenon-socket prefabricated bridge per specimen and one comparative pier specimen(integral cast-in-place bridge pier)were designed and fabricated.The damage mechanism and seismic performance of the assembled specimens were studied by using the proposed static test method combined with numerical simulation.The test results show that:the damage of both specimens is mainly ductile damage in the form of bending damage,mainly manifested by a large amount of concrete crushing and spalling in the plastic hinge area at the bottom of the pier,while the damage of the assembled joint and grout is smaller,and the residual deformation of the assembled specimen is only 79.09%of the overall cast-in-place specimen when the ultimate load is reached,indicating that UHPC grout can enhance the damage tolerance of the pier and make it easier to repair after earthquakes.The tenon-socket prefabricated specimens with short socket depth and lap length of reinforcement achieve reliable connection,and exhibit bearing capacity,ductility,energy dissipation capacity and stiffness close to those of cast-in-place piers under the same hysteretic displacement.With socket depth of 0.4D(D is the width of the specimen section)and above,the joints are reliably connected,and the integrity and seismic performance are basically equivalent to those of cast-in-place.Increasing the modulus of elasticity of grout has an improvement effect on the stiffness of piers.The influence of longitudinal reinforcement diameter on the seismic performance of bridge piers is more significant than that of lap reinforcement in the abutment.Increasing the reinforcement rate of longitudinal reinforcement improves the horizontal bearing capacity and energy dissipation capacity more obviously,but increases the residual deformation of bridge piers.

ultra-high performance concreteprefabricated bridge pierquasi static testseismic performancenumerical simulation

米家禾、亓兴军、王宁宁、杨宇、管青海

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山东建筑大学 交通工程学院,山东 济南 250101

济南金曰公路工程有限公司,山东 济南 250220

湖南中路华程桥梁科技股份有限公司,湖南 湘潭 411100

超高性能混凝土 装配式桥墩 拟静力试验 抗震性能 数值模拟

山东省交通运输厅科技计划项目山东省交通运输厅科技计划项目山东省高等学校土木结构防灾减灾协同创新中心项目山东省自然科学基金面上项目

2022B062020B69XTM201904ZR2021ME104

2024

10.13197/j.eeed.2024.0214

地震工程与工程振动
中国力学学会 中国地震局工程力学研究所

地震工程与工程振动

CSTPCD北大核心
影响因子：0.658
ISSN：1000-1301
年,卷(期)：2024.44(2)
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