预留孔大直径钢筋灌浆与齿槽连接水平节点抗剪性能研究

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

Construction and Building Materials Pub Date : 2025-03-03 DOI:10.1016/j.conbuildmat.2025.140593

Qi Chen , Xiaoyong Luo , Xutong Zheng , Chao Deng

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引用次数: 0

摘要

水平缝不仅影响预制构件的工业生产和装配效率，而且对预制结构的力学性能和抗震性能也起着重要的作用。本文提出了一种齿槽连接、预留孔大直径钢筋灌浆的创新水平节点，并通过1个现浇试件和5个预制试件的单调水平荷载试验，探讨了该节点的破坏模式、荷载-位移曲线、相对滑移、钢筋应变和剪切性能。在此基础上，建立了有限元模型并进行了验证，分析了轴压比、连接强度、搭接长度和预留孔布置等因素对模型的影响。结果表明：水平节点整体破坏模式为剪切滑移破坏，预留孔内连接钢筋和自密实混凝土能有效传递应力；随着轴压比的增大，其抗剪性能显著增强。在一定轴压比下，连接强度对混凝土抗剪性能有一定的增强作用。随着搭接长度的增加，抗剪能力逐渐增大，但对连接钢筋的应变无明显影响。预留孔的直径和间距的影响是有限的，几乎可以忽略不计。在此基础上，提出了齿槽连接水平缝和预留孔大直径钢筋注浆研磨的设计建议。

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Shear behavior of the horizontal joint with tooth groove connection and large-diameter steel bar grout lapping in reserved hole

The horizontal joint not only affects the industrial production and assembly efficiency of precast components, but also plays an important role in the mechanical properties and seismic performance of prefabricated structures. In this paper, an innovative horizontal joint with tooth groove connection and large-diameter steel bar grout lapping in reserved hole was proposed, and the failure mode, load-displacement curve, relative slip, steel bar strain and shear behavior were explored based on the monotonic horizontal load tests of one cast-in-place specimen and five prefabricated specimens. On this basis, a finite element model was established and verified, and the effects of axial compression ratio, connection strength, lap length and arrangement of reserved hole were analyzed. The results indicated that the overall failure mode was the shear slip failure of the horizontal joint, and the connecting steel bar and self-compacting concrete in reserved hole can effectively transfer the stress. With the increase of axial compression ratio, the shear behavior was enhanced significantly. And the connection strength showed a certain strengthening effect on the shear behavior in the case of a constant axial compression ratio. As the lap length increased, the shear capacity increased gradually, but it had no obvious effect on the strain of the connecting steel bar. Moreover, the effect of the diameter and spacing of reserved holes was limited and almost negligible. On this basis, the design suggestions of horizontal joint with tooth groove connection and large-diameter steel bar grout lapping in reserved hole were given.

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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.