用局部近表面安装的铁基形状记忆合金（Fe-SMA）杆件横向加固空心板桥的铰接性能

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-15 DOI:10.1016/j.conbuildmat.2024.139181

Xinliang Sun , Zhiqiang Dong , Cui Zou , Hong Zhu , Yu Sun , Yijie Pan

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引用次数: 0

摘要

铰缝是空心板（HCS）桥梁的关键横向连接件，可在相邻梁之间传递荷载。然而，铰缝容易开裂，这是空心板桥的常见问题。因此，本研究基于铁基形状记忆合金（Fe-SMA）的自应力机制，提出了一种利用局部近表面安装（NSM）Fe-SMA 杆件横向加固铰缝的新技术。为了验证该加固技术的可行性，我们制备了 13 个板梁铰接试件，并结合数字图像相关性（DIC）测试对其进行了挠剪载荷加载。试验系列包括两种数量的铁-SMA 棒（一根和两根）、两种激活长度（100 毫米和 200 毫米）和三种激活温度（未激活、200 ℃ 和 400 ℃）。根据实验数据对加固技术产生的自应力水平进行了研究。结果表明，加固技术能有效增强相邻 HCS 梁的横向连接和铰接接头的力学性能。增加 Fe-SMA 杆件的数量和活化温度可显著提高铰接接头的开裂荷载、裂缝渗透荷载和极限荷载。100 毫米和 200 毫米的活化长度对加固的影响有限。在 200 ℃ 和 400 ℃ 的活化温度下，根据分析得出的有效预应力分别为 277 ± 19 兆帕和 411 ± 21 兆帕。

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Hinge joint performance in hollow-core slab bridges transversely strengthened with local near-surface mounted iron-based shape memory alloy (Fe-SMA) bars

Hinge joints provide key lateral connections within hollow-core slab (HCS) bridges, providing load transfer between adjacent beams. However, hinge joints are prone to cracking, which is a common problem in HCS bridges. Therefore, the present study proposes a novel technique for transverse strengthening of hinge joints by utilizing locally near-surface mounted (NSM) Fe-SMA bars, based on the self-prestressing mechanism of iron-based shape memory alloys (Fe-SMAs). To verify the feasibility of the strengthening technique, 13 slab beam-hinge joint specimens are prepared and loaded under a flexural-shear load in combination with digital image correlation (DIC) tests. The test series encompasses two quantities of Fe-SMA bars (one and two), two activation lengths (100 mm and 200 mm), and three activation temperatures (non-activated, 200 ℃, and 400 ℃). The generated self-prestress level for the strengthening technique is investigated based on experimental data. The results indicate that the strengthening technique can effectively enhance the lateral connection of adjacent HCS beams and the mechanical behavior of hinge joints. Increasing the quantity of Fe-SMA bars and the activation temperature can significantly increase the cracking load, crack penetration load, and ultimate load of hinge joints. Activation lengths of 100 mm and 200 mm have a limited effect on strengthening. At 200 ℃ and 400 ℃ activation temperatures, the effective prestresses based on analysis are 277 ± 19 MPa and 411 ± 21 MPa, respectively.

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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.