Shear behaviour of inorganic polymer concrete beams reinforced with basalt FRP bars and stirrups
Shear behaviour of inorganic polymer concrete beams reinforced with basalt FRP bars and stirrups
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DOI：
10.1016/j.compstruct.2020.112901
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发表时间：
2021-01-01
影响因子：
6.3
通讯作者：
Zhang, Mingzhong
中科院分区：
文献类型：
--
作者：
Fan, Xiaochun;Zhou, Zhengrong;Zhang, Mingzhong
玄武岩纤维增强聚合物（BFRP）增强无机聚合物混凝土（IPC）作为传统钢筋混凝土的替代材料，有望提高结构的可持续性和耐久性。本文首次系统地研究了BFRP筋和箍筋加固IPC梁的抗剪性能，包括试验、理论和数值计算，并考虑了梁间距（S = 80、100和150 mm）和剪跨高比（λ = 1.5、2.0和2.5）的影响。结果表明，所有BFRP-IPC梁的剪切破坏都是由BFRP筋的断裂和剪压破坏引起的。与S相比，λ对BFRP加固IPC梁的抗剪性能有更显著的影响，极限剪切荷载最大降低29.4%。模拟结果与试验数据吻合较好，而根据FRP筋混凝土现有设计规定的理论预测值由于没有考虑λ的影响，与试验值相差30%以上。然后推导出考虑λ影响的修正方程，并用于预测BFRP加固IPC梁的抗剪承载力，其与试验数据吻合良好，平均偏差仅为5%左右。
Inorganic polymer concrete (IPC) reinforced with basalt fibre reinforced polymer (BFRP) was proposed as a promising substitute of conventional reinforced concrete for structures to enhance their sustainability and durability. This paper, for the first time, presents a systematic study, experimental, theoretical and numerical, of shear behaviour of IPC beams reinforced with BFRP bars and stirrups considering the effects of stirrup spacing (S = 80, 100 and 150 mm) and shear span-to-depth ratio (lambda = 1.5, 2.0 and 2.5). Result indicates that all BFRP-IPC beams fail in shear as a result of BFRP stirrup rupture and shear-compression failure. Compared to S, lambda has a more pronounced influence on shear performance of BFRP reinforced IPC beams, with a maximum reduction of ultimate shear load by 29.4%. The simulation results show good agreement with experimental data, while the theoretical predictions according to existing design provisions for FRP reinforced concrete have a discrepancy of more than 30% with experiments due to lack of consideration of lambda. Modified equations taking into account the effect of lambda were then derived and used to predict the shear capacity of BFRP reinforced IPC beams, which agrees well with experimental data with an average discrepancy of only around 5%.