Full-scale testing of the bending behaviour of UHPC gravity–grouted sleeve–prestressed anchor joints in assembled frame tunnels

IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Zhen Huang , Kui Wang , Ying Liu , Wenjun Zhang , Chen Cao
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Abstract

Joints are weak parts of a prefabricated tunnel frame structure, and the joint bending resistance is a crucial factor controlling the deformation and bearing capacity of the tunnel structure. This study proposes a joint with dual anchoring of ultrahigh-performance concrete (UHPC) gravity-grouted sleeves and prestressed steel reinforcement. The material strain, opening amount, deflection, stiffness, rotation angle, and ductility of the grouted sleeve-prestressed anchor joint and grouted sleeve joint types were tested through full-scale bending tests, and with the help of noncontact measurement technology, the dynamic process of joint bending failure was captured. In addition, the finite element method was used to evaluate the influences of the prestressing magnitude and the position of the prestressing steel bars on the bending performance of the joints. The results indicate that the damage to the concrete joint is concentrated at the top of the joint and that the damage to the top surface of the joint concrete is distributed in an "m" shape, indicating that the damage to the concrete in the area between the sleeves is relatively extensive. Owing to the turning points of grouting material fracture and joint yielding, the joint bending process clearly shows a three-stage change. The grouted sleeve-prestressed anchor joint exhibits greater bending stiffness than the grouted sleeve joint does, and the slip of the grouting material in the sleeve is smaller. Prestressing plays a key role in enhancing the bearing capacity and deformation resistance of joints. Considering that excessive prestress may increase the brittleness of the structure, the prestress of the grouted sleeve-prestressed anchor joint is recommended to be 200 kN. This study provides theoretical support for the joint design and construction of prefabricated tunnel frame structures.
组合式框架隧道UHPC重力灌浆套筒-预应力锚杆节点抗弯性能全尺寸试验
接缝是预制隧道框架结构的薄弱部位,接缝的抗弯性能是控制隧道结构变形和承载能力的关键因素。提出了一种超高性能混凝土(UHPC)自重灌浆套筒与预应力钢筋的双锚固节理。通过全尺寸弯曲试验,对灌浆套筒-预应力锚杆节理和灌浆套筒节理类型的材料应变、开度、挠度、刚度、转角和延性进行了测试,并借助非接触测量技术,捕捉了节理弯曲破坏的动态过程。此外,采用有限元法评价了预应力大小和预应力钢筋位置对节点抗弯性能的影响。结果表明:节点混凝土损伤集中在节点顶部,节点混凝土顶面损伤呈“m”形分布,说明套筒间区域混凝土损伤较为广泛;由于注浆材料断裂和节理屈服出现拐点,节理弯曲过程明显呈现三期变化。灌浆套筒-预应力锚杆节理的抗弯刚度大于灌浆套筒节理,且灌浆材料在套筒内的滑移较小。预应力对提高节点承载力和抗变形能力起着关键作用。考虑到过大的预应力可能会增加结构的脆性,建议采用灌浆套-预应力锚固节点的预应力为200 kN。本研究为装配式隧道框架结构的节点设计与施工提供了理论支持。
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来源期刊
Construction and Building Materials
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.
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