BFRP和GFRP筋剪切性能的温度效应  

Temperature Effect on Shear Properties of BFRP and GFRP Bar

作　　者：蔡启明 陆春华[1] 延永东[1] 张菊连 CAI Qiming;LU Chunhua;YAN Yongdong;ZHANG Julian(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China;Shanghai Hongxin Construction Technology Co.,Ltd.,Shanghai 201800,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]上海宏信建筑科技有限公司,上海201800

出　　处：《建筑材料学报》2022年第4期395-400,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51878319,51578267)。

摘　　要：对温度作用后的玄武岩纤维增强复合材料(BFRP)筋和玻璃纤维增强复合材料(GFRP)筋进行了短梁剪切试验,研究了高温后筋材的剪切性能,并提出了温度作用后BFRP、GFRP筋剪切强度的预测计算模型.结果表明:BFRP、GFRP筋的剪切强度均随着温度的升高而逐渐降低;直径为12 mm的BFRP、GFRP筋的剪切强度退化速率比直径为16 mm的更快;270℃高温下,筋材的剪切强度保留率均随着恒温时间的延长呈下降趋势,但BFRP筋的退化速率明显低于GFRP筋;BFRP、GFRP筋剪切强度的退化都主要源于纤维与树脂基体交联度的降低及基体的热降解;与GFRP筋相比,BFRP筋具有更优的耐高温性能.Short beam shear tests of basalt fiber reinforced composite(BFRP)bars and glass fiber reinforced composite(GFRP)bars at different temperatures were carried out,and the shear properties of the bars at high temperature were studied.The prediction and calculation models of the temperature effect on shear strength of BFRP and GFRP bars after temperature were put forward.The results show that the shear strength of BFRP and GFRP bars decreases gradually with the increase of temperature.The shear strength degradation rate of the BFRP and GFRP bars with a diameter of 12 mm is faster than that of bas with a diameter of 16 mm.At 270℃,the shear strength retention of the bars decreases with the extension of the constant temperature time,but the degradtion rate of BFRP bars is significantly lower than that of GFRP bars.The shear strength degradation of BFRP and GFRP bars is mainly due to the reduction of the cross‑linking degree between the fiber and resin matrix and the thermal degradation of the matrix.Compared to GFRP bars,BFRP bars have better high temperature resistance.

关 键 词：玄武岩纤维增强复合材料 玻璃纤维增强复合材料 温度效应 剪切性能 预测模型 

分 类 号：TU502.6[建筑科学—建筑技术科学]