Experimental study on shear behavior of GFRP bars and high-strength thermal insulation mortar strengthened brick masonry walls

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

Construction and Building Materials Pub Date : 2025-10-07 DOI:10.1016/j.conbuildmat.2025.143835

Shengwei Liu , Kuangmin Zheng , Pao Huang , Jiawei Zhang , Cheng Yang , Li an Wang

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Abstract

The shear behavior of brick masonry walls reinforced with Glass Fiber Reinforced Plastic bars and high-strength thermal insulation mortar (GHM) is crucial to determining whether this technique can be applied to integrated thermal insulation and strengthening retrofit projects of masonry structures. Through diagonal compression test, this study investigated the shear behavior of GHM reinforced brick masonry walls, specifically analyzing the effects of masonry mortar strength, volume volume replacement percentage of insulation materials, glass fiber reinforced plastic (GFRP) bar diameter, and GHM-strengthened layer thickness on the shear strength enhancement. Research results indicate that GHM-strengthened brick masonry walls show improved integrity and ductility compared to unreinforced masonry (URM) wall. The bearing capacity, shear strength, and post-cracking displacement of the strengthened specimens were significantly enhanced. Additionally, the load-displacement curves of the strengthened specimens exhibited improved post-peak behavior. After GHM strengthening, the peak load and its corresponding displacement of the specimens increased by 14.02 times and 4.09 times, respectively. The shear strength, ductility factors and energy dissipations increased by 2.42–7.62 times, 2.14–4.68 times, and 21.47–29.10 times, respectively. Based on the analysis of experimental results, a modification factor for shear capacity was introduced into the existing shear capacity prediction model of strengthened brick masonry walls. The modified model exhibited good agreement with the experimental values.

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GFRP筋与高强保温砂浆加筋砖砌体墙体抗剪性能试验研究

玻璃钢钢筋加高强保温砂浆砌筑砖砌体墙体的抗剪性能是决定该技术能否应用于砌体结构综合保温加固改造工程的关键。本研究通过对角压缩试验，研究了GHM加筋砖砌体墙体的抗剪性能，具体分析了砌体砂浆强度、保温材料体积体积替代率、玻璃钢钢筋直径、GHM加筋层厚度对抗剪强度增强的影响。研究结果表明，与未加筋砌体墙体相比，ghm加固砖砌体墙体具有更好的整体性和延性。加固后试件的承载力、抗剪强度和开裂后位移均有显著提高。此外，增强后试件的荷载-位移曲线表现出更好的峰后行为。GHM加固后，试件的峰值荷载和相应位移分别增加了14.02倍和4.09倍。抗剪强度、延性系数和耗能分别提高2.42 ~ 7.62倍、2.14 ~ 4.68倍和21.47 ~ 29.10倍。在对试验结果分析的基础上，在现有的加固砖砌体墙体抗剪承载力预测模型中引入抗剪承载力修正因子。修正后的模型与实验值吻合较好。

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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.