纤维掺量对玻璃纤维增强水泥板弯曲性能的影响

广州大学土木工程学院,广东广州 510006

工程材料; 玻璃纤维增强水泥; 玻璃纤维; 弯曲性能; 数值模拟; 断裂能

Effect of fiber content on bending performance of glass fiber reinforced cement slab
LU Juan,ZHANG Yafang,CHENG Congmi,and HUO Yongjie

School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong Province,P.R. China

engineering material; glass fiber reinforced cement" target="_blank"> glass fiber reinforced cement; glass fiber; bending performance; numerical simulation; fracture energy

DOI: 10.3724/SP.J.1249.2021.04380

备注

为探究纤维掺量对定向玻璃纤维增强水泥(glass fiber reinforced cement,GRC)弯曲性能的影响,在GRC板四点弯曲断裂试验的基础上,采用RFPA3D模拟软件建立三维数值模型,对比不同玻璃纤维掺量下GRC板的破坏模式,分析了试件荷载-位移曲线的发展规律,并通过断裂能研究了纤维的增强增韧作用. 结果表明,当掺杂的玻璃纤维的体积分数在0.5%~2.0%时,试件峰值荷载随着定向纤维体积分数的增加呈增大趋势; 添加纤维的试件在底部出现裂缝后,仍具有一定的承载力,此时纤维虽然发生损伤但未断裂; 随着纤维掺量的增加,试件的裂缝扩展路径愈加曲折,发生破坏时做的功更多,韧性更好. 研究结果可为定向玻璃纤维增强水泥材料的加固提供参考.
To investigate the effect of fiber content on the bending properties of oriented glass fiber reinforced cement(GRC), the four-point flexural test was used to get the fracture performance of oriented GRC slab, and a 3D numerical model is created by RFPA3D simulation software.The failure modes of the GRC slab with different glass fiber content are compared.The load-displacement curve of the specimen is analyzed, and the strengthening and toughening effect of the fiber is investigated by fracture energy. The results show that the peak load of the specimens enhances with the increase of the oriented fiber within volume fraction of 0.5% and 2.0%. The specimen with added fibers still has a certain bearing capacity when cracks appear at the bottom, and the fibers are damaged but not broken. With the increase of fiber content, the crack propagation path becomes more tortuous, the more work is done when failure occurs, and the better the toughness is. The study can provide a reference for reinforcement of directional GRC.
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