GFRP筋尺寸及材料组分对其拉伸性能的影响

摘要

为研究玻璃纤维增强塑料(GFRP)筋尺寸及材料组分与拉伸性能的关系，针对直径不同且同时GF体积分数(vf)不同的聚乙烯(PE)基和不饱和聚酯(UP)基GFRP筋进行拉伸试验。结果表明，两种GFRP筋在拉伸过程中的整个破坏模式以“裂纹破坏模式”为主。PE基GFRP筋的直径是影响其初裂强度(fc)和破坏强度(fp)的主要因素，当直径为20 mm时，筋体的fc和fp均达到最高。UP基GFRP筋直径较小时，其和vf对fc和fp的影响不大，当直径大于16 mm后，其对fc的影响更显著；当vf变化不大时，除在直径为20 mm时fp有一升高的突变值外，其它直径下fp的变化较小。PE基GFRP筋的fc比UP基GFRP筋高很多，其抗开裂性能更好。%In order to research the relationship between tensile properties of GFRP bar and the size and material component, tensile tests were carried out on polyethylene (PE) and unsaturated polyester (UP) matrix GFRP bars with different diameter in which volume fraction (Vf) of glass fiber varied. The results show that the main whole failure mode of the two GFRP bars is"crack failure mode". Initial cracking strength (fc) and failure strength (fp) of PE matrix GFRP bar are affected more significantly by the diameter, the GFRP bar with 20 mm diameter has the maximum in fc and fp. When the diameter of UP matrix GFRP bars is less,fc and fp are affected slightly by the diameter and Vf,but fc is affected more significantly by the diameter above 16 mm diameter,when Vf has very small changes,except that fp has a improved break value when the diameter is 20 mm,fp changes slightly in other diameters. fc of PE matrix GFRP bar is higher than that of UP matrix GFRP and the anti-cracking performance of the former is better.