Local bond-slip response of GFRP rebar in ultra-high-performance fiber-reinforced concrete
Local bond-slip response of GFRP rebar in ultra-high-performance fiber-reinforced concrete
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DOI：
10.1016/j.compstruct.2014.09.055
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发表时间：
2015-02-01
影响因子：
6.3
通讯作者：
Yoon, Young-Soo
中科院分区：
文献类型：
--
作者：
Yoo, Doo-Yeol;Kwon, Ki-Yeon;Yoon, Young-Soo
研究了超高性能纤维混凝土（UHPFRC）中钢和玻璃纤维增强聚合物（GFRP）钢筋的粘结性能。钢筋的粘结强度比GFRP钢筋高2.8-3.6倍，钢筋在2倍钢筋直径的嵌入长度下屈服。GFRP筋的粘结破坏是由于GFRP筋中树脂和纤维的分层而发生的，不同于钢筋的粘结破坏（混凝土的剪切和压碎）。对于GFRP筋，当采用较大的钢筋直径和较短的埋置长度时，可获得较高的粘结强度，并观察到由于楔入效应，软化分支的拔出应力再次增加。提出了考虑拔出破坏时UHPFRC中GFRP筋的归一化粘结强度和发展长度的计算公式。此外，GFRP筋的粘结滑移响应的分析模型中提出的文献被认为是，并从目前的测试数据得到足够的参数。(C)2014爱思唯尔有限公司版权所有。
This study investigates the bond performance of steel and glass fiber-reinforced polymer (GFRP) rebars embedded in ultra-high-performance fiber-reinforced concrete (UHPFRC). The steel rebar showed 2.8-3.6 times higher bond strengths than the GFRP rebar and rebar yielding at embedment length of 2 times the rebar diameter. The bond failure of GFRP rebar occurred by delaminating resin and fiber in GFRP rebar, different to that of steel rebar (shearing off and crushing of concrete). For GFRP rebar, higher bond strength was obtained when a larger rebar diameter and a shorter embedment length were used, and reincrease of pull-out stress in softening branch was observed owing to wedging effect. Equations for normalized bond strength and development length of GFRP rebar embedded in UHPFRC with pull-out failure were suggested. In addition, analytical models for bond-slip response of GFRP rebar proposed in the literature were considered, and adequate parameters were derived from the present test data. (C) 2014 Elsevier Ltd. All rights reserved.