GFRP筋混凝土梁抗裂性能理论与试验研究*
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(1 莆田学院土木工程学院, 莆田 351100； 2 福州大学土木工程学院, 福州 350116)
［摘要］GFRP筋具有抗拉强度高、重量轻、抗腐蚀、耐疲劳等特点，用它代替混凝土结构中受腐蚀的钢筋具有重要的工程意义。GFRP筋混凝土梁的开裂弯矩是衡量其抗裂性能的重要指标，也是GFRP筋混凝土梁裂缝宽度、挠度以及力学性能计算的重要参数。首先推导了与钢筋混凝土梁开裂弯矩计算方法相衔接的GFRP筋混凝土梁开裂弯矩的计算公式，然后通过7根GFRP筋混凝土简支梁及6根GFRP筋混凝土连续梁试验检验了公式的适用性。试验过程中通过在GFRP筋混凝土梁受压区及受拉区配置不同数量的GFRP筋来研究其开裂过程及开裂荷载。研究结果表明，按照给出的GFRP筋混凝土矩形截面梁正截面开裂弯矩公式得到的理论值与试验值吻合较好，研究成果将为进一步研究GFRP筋混凝土梁的力学性能提供参考。［关键词］GFRP筋; 抗裂性能; 开裂弯矩; 试验研究中图分类号：TU377.9 文献标识码：A 文章编号：1002-848X(2016)04-0097-05
Theoretical and experimental research on the cracking resistance performance of concrete beam reinforced with GFRP barsWu Zhiming1, Qi Ai2(1 College of Civil Engineering, Putian University, Putian 351100, China; 2 College of Civil Engineering, Fuzhou University, Fuzhou 350116, China)Abstract:GFRP bars have the characteristics of high tensile strength, light weight, strong resistance to corrosion and fatigue resistance. It has important engineering significance for replacing of corrosive steel bars with GFRP bars in the concrete structures. The cracking moment of concrete beam reinforced with GFRP bars is an important index for measuring the cracking resistance performance, and which is also an important calculation parameter for crack width, deflection and mechanical properties of concrete beam reinforced with GFRP bars. Firstly, the calculation formula of cracking moment of concrete beam reinforced with GFRP bars was deduced, which is established as an extension of the calculation method of concrete beam reinforced with steel bars. And then the applicability of the formula was examined by tests of seven simply-supported concrete beams reinforced with GFRP bars and six continuous concrete beams reinforced with GFRP bars. In the process of the tests, the cracking process and cracking load of concrete beams reinforced with GFRP bars were studied by configuring different number of GFRP bars in the compressive and tensile zones. The results of the study show that, the theoretical values are in good agreement with the experimental values according to the provided cracking moment formulas of normal section of concrete rectangular section beam reinforced with GFRP bars. The research results will provide reference for further study on mechanical properties of concrete beams reinforced with GFRP bars.Keywords:GFRP bars; cracking resistance performance; cracking moment; experimental study
*福建省科技计划重点项目 (2014Y0071)。作者简介：吴智明，硕士，讲师，Email：pt12008@sina.com。
