用铁基形状记忆合金 U 型杆加固的空心板桥铰缝的性能

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-23 DOI:10.1016/j.istruc.2024.107613

Xinliang Sun , Zhiqiang Dong , Cui Zou , Hong Zhu , Gang Wu , Yijie Pan

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引用次数: 0

摘要

铰缝的力学行为对空心板桥有重要影响。然而，铰缝容易开裂。本研究为新型空心板桥提出了一种由局部预应力铁基形状记忆合金（Fe-SMA）U 型杆加固的新型铰接接头。为了验证这种铰接接头的有效性，研究人员制作了六个测试样本，包括两个跨度（10 米和 20 米）和三种工作条件（非激活、开裂前激活以及开裂后修复和激活）。研究了弯曲剪切荷载下的荷载传递机理，并利用提出的简化分析模型验证了其有效性。结果表明，新型铰接接头在挠剪载荷作用下的失效模式可分为三个阶段。新铰接接头可通过加热激活 Fe-SMA U 形杆有效施加局部预应力，从而增加裂缝穿透荷载。此外，受损的新铰接接头可通过压力注入粘合剂和加热激活 Fe-SMA U 形杆进行修复和进一步加固。荷载传递受裂缝发展的影响，新铰接接头的极限荷载受铰接接头混凝土的劈裂抗拉强度控制。

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Performance of hinge joints in hollow-core slab bridges reinforced with iron-based shape memory alloy U-bars

The mechanical behavior of hinge joints has an important influence on the hollow-core slab bridges. However, hinge joints are prone to cracking. This study proposed a new hinge joint reinforced by locally prestressed iron-based shape memory alloy (Fe-SMA) U-bars for the new hollow-core slab bridge. To verify the effectiveness of this hinge joint, six test specimens were prepared, encompassing two spans (10 m and 20 m), and three working conditions (nonactivation, activation before cracking, and repair and activation after cracking). The load transfer mechanism under flexural-shear load was investigated, and the validity was verified using a proposed simplified analytical model. The results indicated that the failure mode of the new hinge joint under flexural-shear load can be divided into three stages. The new hinge joint can effectively apply local prestressing by heating activation of the Fe-SMA U-bars, thus increasing the crack penetration load. In addition, the damaged new hinge joints can be repaired and further reinforced by pressure injection of adhesive and heating activation of the Fe-SMA U-bars. Load transfer is affected by the development of cracks, and the ultimate load of the new hinge joint is controlled by the splitting tensile strength of the concrete in the hinge joint.

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.