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Response of concrete columns reinforced with longitudinal and transverse BFRP bars under concentric and eccentric loading

机译：同心和偏心载荷下纵向和横向BFRP棒强化混凝土柱的响应

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摘要

This study investigates the behaviour of concrete columns reinforced with longitudinal and transverse basalt fiber-reinforced polymer (BFRP) bars, the most recent of FRP composites. Twelve full-scale concrete columns reinforced with longitudinal BFRP bars and either steel or BFRP ties were tested under both concentric and eccentric loadings. The investigated parameters included the type and spacing of the transverse reinforcement (BFRP and steel ties) and the load eccentricity-to-width ratio (e/h = 0, 22.2%, 44.4%). The test results showed that reducing the spacing of the BFRP ties improved the ductility and confinement efficiency of the BFRP-reinforced concrete (BFRP-RC) columns. However, reducing the ties' spacing had an insignificant effect on both the load-carrying capacities of the columns and the contribution of the longitudinal bars to their ultimate capacities. Moreover, BFRP-RC columns confined with BFRP ties exhibited ultimate capacities, bar strength contribution, and confinement efficiency comparable with their counterpart columns confined with steel ties at the same spacing. This study displayed that the current code provisions of CSA-S806-R17 and ACI440.1R-15 for FRP transverse reinforcement can ensure adequate confinement of the concrete core for BFRP-RC columns.
机译：本研究调查了用纵向和横向玄武岩纤维增强聚合物（BFRP）棒的混凝土柱的行为，是最近期的FRP复合材料。在同心和偏心载荷下，测试了具有纵向BFRP条和钢或BFRP领带的12个全尺寸混凝土柱。调查的参数包括横向增强（BFRP和钢带）的类型和间隔，以及负载偏心至宽比（E / H = 0,22.2％，44.4％）。测试结果表明，减少了BFRP联系的间距改善了BFRP钢筋混凝土（BFRP-RC）柱的延展性和限制效率。然而，减少了圆柱的间距对柱的承载能力和纵向杆对其最终能力的贡献产生了微不足道的影响。此外，与BFRP领带限制的BFRP-RC色谱柱表现出终极容量，钢筋强度贡献和与与其相同的钢连接柱相当的相当的限制效率。本研究表明，CSA-S806-R17和ACI440.1R-15用于FRP横向增强的当前代码规定可以确保BFRP-RC柱的混凝土核心充分限制。

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