Sustainable steel-concrete composite beams with novel demountable shear connections under positive bending moments: experimental behavior and analytical model

IF 4.1 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Bulletin of Earthquake Engineering Pub Date : 2025-08-18 DOI:10.1007/s10518-025-02248-0

Liquan Xiong, Yuguo Liu, Song Li, Yajuan Li, Xinyong Wang, Daomin Tang, Xiaojian Chen

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引用次数: 0

Abstract

Sustainable structures or structural components as one of the frontiers in civil engineering can solve the problem of construction and demolition waste and also enhance the reuse of structural components at the end of their service life or after damage. In terms of sustainable assessment, steel-concrete composite beams with or without novel demountable shear connectors were performed in this work. Structural configuration and mechanical properties of proposed sustainable steel-concrete composite beams were firstly presented and then the nonlinear analysis of this composite beams using the Abaqus software was validated. Three specimens with different types of shear connectors were designed and tested under two-point loading to investigate the flexural behavior and deconstructability. Results from this research showed that these composite beams exhibited a flexure-shear or flexural behavior, presenting the typical failure modes of yielding of steel beam, slab concrete split or concrete crushing of plug. Compared to that of traditional composite beam with embedded welded bolts, specimens with demountable shear bolts and demountable shear connections experienced reduced initial flexural stiffness (about 29.8% and 37.2%), yield strength (by about 18.3% and 32.1%) and ultimate strength (about 12.9% and 24.9%) due to the relative slip between the steel beam and precast concrete slab, respectively. Whereas these of composite beams developed a better deformation capacity and ductility coefficient. Additionally, sustainable steel-concrete composite beam with demountable shear connections could easily allow for easy installment and disassemble to achieve the recycle of these structural members and also replacement with new plugs to permit a quick seismic rehabilitation after earthquake. Finally, some suggestions of this sustainable composite beam and demountable shear connections were proposed to provide references for the design in practice.

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具有新型可拆卸剪力连接的钢-混凝土组合梁在正弯矩作用下的试验性能和分析模型

可持续结构或结构构件作为土木工程领域的前沿之一，可以解决建筑和拆除垃圾问题，也可以提高结构构件在使用寿命结束或损坏后的再利用。在可持续评估方面，在这项工作中进行了钢-混凝土组合梁，有或没有新型可拆卸剪切连接件。首先介绍了所提出的钢-混凝土可持续组合梁的结构形态和力学性能，然后利用Abaqus软件对该组合梁进行了非线性分析。在两点荷载作用下，设计了3个不同类型剪力连接件试件，对其抗弯性能和可拆解性进行了研究。研究结果表明，这些组合梁表现出弯剪或弯曲的特性，表现出典型的钢梁屈服、板混凝土劈裂或混凝土塞压破坏模式。与传统预埋焊接螺栓组合梁相比，采用可拆卸剪切螺栓和可拆卸剪切连接的试件由于钢梁与预制混凝土板之间的相对滑移，其初始抗弯刚度（分别降低29.8%和37.2%）、屈服强度（分别降低18.3%和32.1%）和极限强度（分别降低12.9%和24.9%）。组合梁具有较好的变形能力和延性系数。此外，具有可拆卸剪切连接的可持续钢-混凝土组合梁可以很容易地安装和拆卸，以实现这些结构构件的循环利用，也可以更换新的插头，以便在地震后快速进行地震恢复。最后，对这种可持续组合梁和可拆卸剪力连接提出了一些建议，为实际设计提供参考。

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来源期刊

Bulletin of Earthquake Engineering 工程技术-地球科学综合

CiteScore

8.90

自引率

19.60%

发文量

263

审稿时长

7.5 months

期刊介绍： Bulletin of Earthquake Engineering presents original, peer-reviewed papers on research related to the broad spectrum of earthquake engineering. The journal offers a forum for presentation and discussion of such matters as European damaging earthquakes, new developments in earthquake regulations, and national policies applied after major seismic events, including strengthening of existing buildings. Coverage includes seismic hazard studies and methods for mitigation of risk; earthquake source mechanism and strong motion characterization and their use for engineering applications; geological and geotechnical site conditions under earthquake excitations; cyclic behavior of soils; analysis and design of earth structures and foundations under seismic conditions; zonation and microzonation methodologies; earthquake scenarios and vulnerability assessments; earthquake codes and improvements, and much more. This is the Official Publication of the European Association for Earthquake Engineering.