Axial compressive behavior of concrete columns strengthened with BFRP grids

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2025-05-30 Epub Date: 2025-04-19 DOI:10.1016/j.conbuildmat.2025.141305

Peng Liu , Xin Wang , Weidong He , Dengfeng Lu , Zhishen Wu , Xiaofei Zhang , Yongbo Shao

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Abstract

The aim of this study is to evaluate the axial compressive behavior of concrete columns strengthened with basalt fiber-reinforced polymer (BFRP) grids. A total of 27 concrete cylinders were tested, including 18 strengthened specimens and 9 control specimens. The study parameters included specimen size and grids quantity, and comparisons were made with specimens strengthened using BFRP sheets. The results indicate that the control specimens exhibited brittle failure, while the strengthened specimens demonstrated ductile failure, with significantly improved compressive carrying capacity and deformation ability. The strength effectiveness of the grids gradually weakened as the specimen size increased. When the number of grids layers was less than two, the strength effect significantly improved with an increase in grids quantity. However, when the number of grids layers exceeded two, delamination between the grids and concrete occurred, and the strength effect became less significant. Compared to BFRP sheets, BFRP grids demonstrated higher strength efficiency. Several existing theoretical models were utilized to predict the peak stress of BFRP grid-strengthened concrete, and the predicted results agreed well with the experimental results.

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使用 BFRP 网格加固的混凝土柱的轴向抗压行为

本研究的目的是评估玄武岩纤维增强聚合物（BFRP）网格加固混凝土柱的轴压性能。共试验27个混凝土柱，其中加固试件18个，对照试件9个。研究参数包括试件尺寸和网格数量，并与BFRP布加固试件进行比较。结果表明：对照试件表现为脆性破坏，强化试件表现为延性破坏，抗压承载力和变形能力显著提高；随着试件尺寸的增大，网格的强度有效性逐渐减弱。当网格层数小于2层时，随着网格数量的增加，强度效应显著提高。然而，当网格层数超过2层时，网格与混凝土之间发生分层，强度效应变得不那么显著。与BFRP板材相比，BFRP格栅具有更高的强度效率。利用已有的几种理论模型对BFRP网格加固混凝土的峰值应力进行了预测，预测结果与试验结果吻合较好。

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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.