Seismic performance of UHPC precast double-column piers with socket connections

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-04-23 DOI:10.1617/s11527-025-02667-0

Jinliang Liu, Mingfei Li, Guanhua Zhang

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引用次数: 0

Abstract

Ultra-high performance concrete (UHPC) offers excellent seismic toughness, but its use as a full structural material remains underexplored. In this study, the UHPC cast-in-place double-column pier and the UHPC precast socket-connected double-column pier were designed and fabricated. Seismic performance was evaluated through quasi-static loading tests, analyzing failure modes and mechanical responses. Both piers experienced flexural failure. However, the precast pier demonstrated a 16.5% increase in ultimate load capacity and a 4.5% increase in cumulative energy dissipation compared to the cast-in-place pier. The superior seismic performance of the precast pier is attributed to the shear keys in the socket section, which enhance joint anchoring, and the UHPC columns embedded in the foundation and cap beam, which fully utilize the mechanical properties of the material. Finite element analysis was conducted to investigate the influence of factors such as socket depth, axial load ratio, grout strength, and rebar properties on the seismic performance of the piers. Results indicate that grout strength and longitudinal rebar strength have a substantial effect on the yield capacity and ultimate load capacity of the piers. Finally, displacement angle limits for UHPC double-column piers at various performance levels were proposed based on seismic design codes. Research on UHPC precast piers is expected to promote the adoption of precast methods and advanced materials in bridge substructures, providing strong support for bridge design in seismic regions.

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采用承插式连接的超高性能混凝土预制双柱墩的抗震性能

超高性能混凝土（UHPC）具有优异的抗震韧性，但其作为完整结构材料的用途仍未得到充分开发。本文对UHPC现浇双柱墩和UHPC嵌套连接预制双柱墩进行了设计和制作。通过准静态加载试验，分析破坏模式和力学响应，评估了其抗震性能。两个桥墩都经历了弯曲破坏。然而，与现浇墩相比，预制墩的极限承载能力增加了16.5%，累积耗能增加了4.5%。预制墩抗震性能优异的主要原因是承插段的剪力键增强了节点锚固作用，而基础和承台梁内嵌的UHPC柱充分利用了材料的力学性能。通过有限元分析，探讨承台深度、轴向载荷比、灌浆强度、钢筋性能等因素对桥墩抗震性能的影响。结果表明，灌浆强度和纵筋强度对桥墩的屈服能力和极限承载能力有较大影响。最后，根据抗震设计规范，提出了不同性能水平下UHPC双柱墩的位移角极限。UHPC预制桥墩的研究有望推动桥梁下部结构采用预制方法和先进材料，为震区桥梁设计提供有力支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.