Bond Performance of Sanded Surface and Threaded Smooth Gfrp Bars

Antony Kodsy
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Abstract

Steel Reinforcement corrosion has been reported to be a major contributor in the deterioration of concrete structures. The use of FRP bars as reinforcement in concrete structures has proven to provide an effective solution for this durability issue [1]. The physical and mechanical properties and surface shape of GFRP bars are significantly different from steel bars. This difference cause GFRP bars to have lower bonding properties with concrete than steel bars causing bond performance to be a major concern when designing GFRP reinforced concrete elements [2]. Several pullout tests have been done to evaluate bond strength of FRP bars which is a major factor in estimating development length [3-5]. The ACI 440.1R-15 [3] defines development length as the embedment in concrete required to transfer the force in the bar through bond (equation 10.1a). The used GFRP bars in this study had a guaranteed tensile strength (mean tensile strength of test specimens minus three times standard deviation [3] of 121 ksi (834 MPa). This value falls within the range of the ACI 440.1R-15 GFRP bar tensile strength values of 70 to 230 ksi (483 to 690 MPa). Discussion and Results
砂面与螺纹光滑Gfrp筋的粘结性能
据报道,钢筋腐蚀是混凝土结构恶化的主要原因。在混凝土结构中使用FRP筋作为钢筋已被证明是解决这一耐久性问题的有效方法[1]。GFRP筋的物理力学性能和表面形状与钢筋有明显的不同。这种差异导致GFRP筋与混凝土的粘结性能低于钢筋,因此在设计GFRP筋混凝土构件时,粘结性能是一个主要问题[2]。为了评估FRP筋的粘结强度,已经进行了几次拉拔试验,这是估算开发长度的主要因素[3-5]。ACI 440.1R-15[3]将发展长度定义为通过粘结传递杆内力所需的混凝土嵌入长度(式10.1a)。本研究使用的GFRP筋具有保证抗拉强度(试件平均抗拉强度减去3倍标准差[3]121 ksi (834 MPa))。该值落在ACI 440.1R-15 GFRP筋抗拉强度值70 ~ 230 ksi (483 ~ 690 MPa)的范围内。讨论与结果
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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