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玻璃纤维复材(GFRP)筋拉伸性能的温度效应十分明显,特别是高温环境下其性能变化规律在工程应用中需要重点关注。以GFRP筋直径、温度值高低、温度升高方式和恒温时间等为变化因素,通过试验研究温度效应下GFRP筋拉伸力学性能的变化规律。研究结果表明:随着温度升高,GFRP筋极限抗拉强度和极限应变下降较明显,而高温作用对GFRP筋的弹性模量影响较小。高温下直径16 mm的GFRP筋的极限抗拉强度和弹性模量比直径22,25 mm的高。温度低于240℃的情况下,经恒高温作用后筋体的极限抗拉强度比未经恒高温作用的同温度下的筋材略有增加,高于240℃后两种筋材的极限抗拉强度无明显差异。当恒高温作用时间不超过1 h时,GFRP筋力学性能较为稳定。
The temperature effect of the tensile properties of GFRP tendons is very obvious, especially in the high temperature environment, the law of its properties needs to be focused on in engineering application. The change rules of tensile properties of GFRP tendons under temperature effect were studied by taking GFRP tendons diameter, temperature value, temperature rising mode and constant temperature time as the changing factors. The results show that with the increase of temperature, the ultimate tensile strength and ultimate strain of GFRP tend to decrease obviously, while the effect of high temperature on elastic modulus of GFRP tendon is less. The ultimate tensile strength and modulus of elasticity of GFRP bars with a diameter of 16 mm at high temperatures are higher than those of 22,25 mm diameter. When the temperature is lower than 240 ℃, the ultimate tensile strength of the body after the constant high temperature is slightly higher than that at the same temperature without the constant high temperature. When the ultimate tensile strength is higher than 240 ℃, the ultimate tensile strength No significant difference in tensile strength. When the constant temperature does not exceed 1 h, the mechanical properties of GFRP tendons are stable.