A novel technique to improve the compressive strength and ductility of glass fiber reinforced polymer (GFRP) composite bars
A novel technique to improve the compressive strength and ductility of glass fiber reinforced polymer (GFRP) composite bars
复制标题
提高玻璃纤维增强聚合物（GFRP）复合材料棒抗压强度和延展性的新技术
DOI：
10.1016/j.conbuildmat.2022.126782
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发表时间：
2022-02-21
影响因子：
7.4
通讯作者：
Manalo, Allan
中科院分区：
文献类型：
--
作者：
Liu, Yue;Zhang, Hong-Tao;Manalo, Allan
玻璃纤维增强聚合物（GFRP）复合筋具有优良的耐久性相比，传统的钢钢筋，但其强度贡献在受压构件的设计通常被忽略。GFRP筋的非均质和各向异性特性，包括其复杂的受压性能和缺乏标准的测试程序，阻碍了其作为受压钢筋的使用。为了改善其压缩性能和强度，已经开发了一种新的技术，通过缠绕额外的GFRP层周围的纵向纤维。已经使用了一个、两个和三个缠绕层，每层厚度为1.5mm，缠绕角度为+/-83.3度。抗压强度测试，然后进行了20毫米和30毫米高的GFRP筋与芯直径为20毫米，以确定在抗压强度，延性和破坏行为的改善。试验结果表明，随着缠绕层数的增加，芯径为20 mm的GFRP筋在抗压强度和延性方面表现出良好的改善效果，其中缠绕层数为3层的20 mm和30 mm高的GFRP筋的抗压强度分别提高了74%和63%。压缩和拉伸力学性能的比较表明，最佳的强度和延展性的改善，可以实现与两个缠绕层。建立了一个简单的理论强度模型，可以可靠地预测缠绕GFRP筋的抗压强度。
Glass fiber reinforced polymer (GFRP) composite bars have excellent durability compared to traditional steel reinforcements but their strength contribution in the design of compression members is generally neglected. The non-homogeneous and anisotropic nature of GFRP bars including their complex behavior in compression and the lack of standard testing procedure have hindered their use as compressive reinforcements. To improve their behavior and strength in compression, a novel technique has been developed by winding additional GFRP layers around the longitudinal fibers. One, two and three winding layers with a thickness of 1.5 mm for each layer and a winding angle of +/- 83.3 degrees have been used. Compressive strength tests have then been conducted on 20 mm and 30 mm high GFRP bars with a core diameter of 20 mm to determine the improvement in compressive strength, ductility, and failure behavior. Test results showed that the 20 mm core diameter GFRP bars have shown promising improvement in the compressive strength and ductility with the increased number of winding layers wherein the compressive strength of the 20 mm and 30 mm high bars increased by 74% and 63%, respectively for bars with three winding layers. Comparison of the mechanical properties in compression and tension showed that the optimum strength and ductility improvement can be achieved with two winding layers. A simple theoretical strength model has been developed which can reliably predict the compressive strength of the winded GFRP bars.