Experimental Investigation of Circular High-Strength Concrete Columns Reinforced with Glass Fiber-Reinforced Polymer Bars and Helices under Different Loading Conditions
Experimental Investigation of Circular High-Strength Concrete Columns Reinforced with Glass Fiber-Reinforced Polymer Bars and Helices under Different Loading Conditions
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DOI：
10.1061/(asce)cc.1943-5614.0000784
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发表时间：
2017-08-01
影响因子：
4.6
通讯作者：
Sheikh, M. Neaz
中科院分区：
文献类型：
--
作者：
Hadi, Muhammad N. S.;Hasan, Hayder Alaa;Sheikh, M. Neaz
现有的设计规范和指南没有充分解决纤维增强聚合物（FRP）钢筋混凝土柱的设计。因此，许多研究调查的FRP钢筋混凝土柱的行为。然而，以往的研究仅限于FRP筋普通强度混凝土（NSC）柱。研究了玻璃纤维增强聚合物（GFRP）筋高强混凝土（HSC）试件在不同荷载条件下的轴向承载力、GFRP螺旋约束效率、延性和峰值后轴向荷载-轴向变形响应。关键参数，如钢筋的类型（钢和GFRP），横向螺旋的间距，和加载条件（同心，偏心，和四点加载）对试样的性能的影响进行了研究。有人观察到，GFRP筋增强HSC标本维持类似的轴向载荷下同心轴向压缩相比，其钢对应物，但GFRP筋增强HSC标本在维持轴向载荷的效率随着轴向载荷偏心率的增加而降低。用等量的GFRP筋直接替代高强混凝土试件中的钢筋，在同心轴向荷载下的延性降低了约30%。然而，有人发现，延性和峰值后的轴向荷载-轴向变形行为的GFRP筋增强高强混凝土试件可以显着提高通过提供紧密间隔的螺旋。(C)2017年美国土木工程师协会。
Existing design codes and guidelines do not adequately address the design of concrete columns reinforced with fiber-reinforced polymer (FRP) bars. Accordingly, a number of research studies investigated the behavior of FRP bar-reinforced concrete columns. However, the previous studies were limited to FRP bar-reinforced normal-strength concrete (NSC) columns. In this study, the behavior of glass fiber-reinforced polymer (GFRP) bar-reinforced high-strength concrete (HSC) specimens under different loading conditions was investigated in terms of axial load-carrying capacity, confinement efficiency of the GFRP helices, as well as the ductility and post-peak axial load-axial deformation response. The effects of the key parameters such as the type of the reinforcement (steel and GFRP), the pitch of the transverse helices, and the loading condition (concentric, eccentric, and four-point loading) on the performance of the specimens were investigated. It was observed that the GFRP bar-reinforced HSC specimen sustained similar axial load under concentric axial compression compared to its steel counterpart, but the efficiency of GFRP bar-reinforced HSC specimens in sustaining axial loads decreased with an increase in the axial load eccentricity. Direct replacement of steel reinforcement by the same amount of GFRP reinforcement in HSC specimens resulted in about 30% less ductility under concentric axial load. However, it was found that the ductility and post-peak axial load-axial deformation behavior of the GFRP bar-reinforced HSC specimens can be significantly improved by providing closely spaced helices. (C) 2017 American Society of Civil Engineers.