Shear behavior and damage identification of π-shaped demountable connector for composite beam equipped with acoustic emission sensors

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-04 DOI:10.1016/j.conbuildmat.2025.143811

Jun He , Yuanwang Li , Hongli Li , Yafei Ma , Sidong Feng , Zitong Wang

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引用次数: 0

Abstract

To advance rapid assembly methodologies in steel-concrete composite bridges, this study proposes a novel demountable π-shaped shear connector and systematically investigates its structural performance. Two configurations, longitudinal (L-Conn) and transverse (T-Conn) π-shaped connectors, were designed and evaluated via standardized push-out tests to explore failure mechanisms under shear loading. Experimental results demonstrate that concrete-filled configurations achieve comparable ultimate shear capacities (T-Conn: 844 kN; L-Conn: 915 kN), yet exhibit a notable divergence in ultimate displacements (T-Conn: 5.19 mm vs. L-Conn: 8.78 mm). In contrast, unfilled connectors fail prematurely due to internal deformation localization and stress redistribution. Stiffness evolution reveals a nonlinear trend, with transverse configurations exhibiting higher initial stiffness than longitudinal counterparts. A high-precision finite element model, validated against experimental data, replicates critical failure modes and load-slip behavior within 5 % error. Complementary acoustic emission (AE) monitoring equipment captures fracture progression through energy, ring count, amplitude, rise time, and duration parameters. During elastoplastic stage, a surge of high-energy AE signals (energy >10,000 aJ) correlates with bolt yielding and interfacial concrete damage. Statistical analysis identifies weak amplitude-parameter correlations but strong energy-based interdependencies, prompting the development of a cumulative damage model integrating energy-amplitude thresholds for real-time degradation assessment. Theoretical validation confirms alignment with Eurocode 4 (EC4) shear capacity predictions (error <10 %). These findings establish a framework for non-destructive evaluation and structural health monitoring of demountable connectors, directly supporting the design and life-cycle management of modular composite bridges.

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装有声发射传感器的复合梁π形可拆卸接头剪切性能及损伤识别

为了推进钢-混凝土组合桥梁的快速装配方法，本研究提出了一种新型可拆卸π形剪切接头，并对其结构性能进行了系统的研究。设计了纵向（L-Conn）和横向(T-Conn) π形连接器两种构型，并通过标准化推出试验对其进行了评估，以探索剪切荷载作用下的破坏机制。试验结果表明，两种混凝土结构的极限抗剪能力相当（T-Conn: 844 kN; L-Conn: 915 kN），但在极限位移方面存在显著差异（T-Conn: 5.19 mm vs. L-Conn: 8.78 mm）。相反，未填充的连接器由于内部变形局部化和应力重新分布而过早失效。刚度演化呈现非线性趋势，横向结构的初始刚度高于纵向结构。根据实验数据验证的高精度有限元模型在5 %的误差范围内复制了临界失效模式和负载滑移行为。互补声发射（AE）监测设备通过能量、环数、振幅、上升时间和持续时间等参数捕捉裂缝进展。弹塑性阶段，高能量声发射信号激增（能量>；10,000 aJ）与锚杆屈服和混凝土界面损伤有关。统计分析表明，振幅参数之间的相关性较弱，但基于能量的相互依赖性较强，这促使了累积损伤模型的发展，该模型集成了能量振幅阈值，用于实时退化评估。理论验证证实与欧洲规范4 （EC4）剪切能力预测一致（误差<；10 %）。这些发现为可拆卸连接器的无损评估和结构健康监测建立了框架，直接支持模块化复合桥梁的设计和生命周期管理。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.