Synergistic confinement mechanisms and damage tolerance of concrete hollow bridge pier repaired by FRP-CGM jackets under multi-directional demands

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2026-09-01 Epub Date: 2026-08-28 DOI:10.1016/j.compstruct.2026.120790

Qahtan Al-Shami, Mohammed Al-Haaj, Ahmed Al-Olofi, Yousef Sewar, Soria Naji, Mohammed Amer, Ning Li

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引用次数: 0

Abstract

Post-earthquake repair of bridge piers is typically evaluated under simplified unidirectional loading, although their seismic behavior under realistic multi-directional conditions remains insufficiently explored. In this paper, the seismic repair performance of post-earthquake-damaged hollow concrete bridge piers (HCBPs) is investigated using an improved 6-DOF multi-directional electro-hydraulic testing system. Glass FRP-confined high-strength non-shrink cementitious grout material (CGM) jackets have been proposed as a durable strategy to restore and enhance the structural performance of HCBPs. Large-scale cyclic tests were conducted under simultaneous quadriaxial translational and rotational degrees of freedom, with an amplitude derived from an experimentally validated fiber-based finite element model. The repaired RHCBP recovered 94.9% and 86.3% of the original lateral load capacity, while the resultant lateral load capacity and initial stiffness exceeded the original unidirectional values. The accumulative energy dissipation and resultant flexural capacity increased by 21.6% and 38.2%, respectively. Damage evolution and repair efficiency were quantitatively assessed using the Park–Ang damage index and 3D-DIC based strain mapping. An analysis-oriented cross-section model incorporating constitutive relationships for FRP-confined CGM and a force demand–capacity framework was developed to predict flexural capacity and plastic hinge relocation.

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多向需求下FRP-CGM护套修复混凝土空心桥墩的协同约束机理及损伤容限

桥梁桥墩的震后修复通常在简化的单向荷载下进行评估，但其在现实多向条件下的抗震性能研究还不够充分。采用改进的六自由度多向电液试验系统，对地震破坏后空心混凝土桥墩的抗震修复性能进行了研究。玻璃frp约束的高强度非收缩胶凝灌浆材料（CGM）护套被认为是恢复和提高HCBPs结构性能的持久策略。同时在四轴平移和旋转自由度下进行了大规模循环试验，其振幅来自实验验证的基于纤维的有限元模型。修复后的RHCBP恢复了原侧载能力的94.9%和86.3%，而由此产生的侧载能力和初始刚度超过了原单向值。累计耗能和累计抗弯承载力分别提高21.6%和38.2%。利用Park-Ang损伤指数和3D-DIC应变映射定量评估损伤演化和修复效率。基于frp约束CGM的本构关系和力需求-容量框架，建立了面向分析的截面模型，用于预测抗弯能力和塑性铰位移。

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

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.