石墨烯/环氧涂层钢筋混凝土梁受弯性能研究

为研究石墨烯/环氧涂层钢筋应用于混凝土构件时的性能，对3根石墨烯/环氧涂层钢筋混凝土梁和1根普通钢筋混凝土梁进行正截面受弯性能试验，对比分析各试验梁的承载力、挠度、裂缝和破坏形态，并将试验值与规范公式的计算值进行对比。结果表明：石墨烯/环氧涂层钢筋混凝土梁的受弯性能与普通钢筋混凝土梁基本相同，环氧涂层中石墨烯的掺量对梁受弯性能的影响很小；GB 50010—2010《混凝土结构设计规范》中给出的平均裂缝间距公式和短期最大裂缝宽度计算公式等仍适用于石墨烯/环氧涂层钢筋混凝土梁，其中平均裂缝间距和短期最大裂缝宽度的计算应在规范公式的基础上乘以修正系数1.15，以考虑受拉筋为石墨烯/环氧涂层钢筋时裂缝间距和宽度增大的现象。

Study on flexural behavior of graphene/epoxy-coated-rebar reinforced concrete beams

In order to study the performance of graphene/epoxy-coated-rebars applied in concrete components, three graphene/epoxy-coated-rebar reinforced concrete beams and one ordinary reinforced concrete beam were tested for flexural behavior of normal section. The bearing capacity, deflection, crack and failure mode of each test beam were compared and analyzed, and the test values were compared with the calculated values of the code. The results show that the flexural behavior of the graphene/epoxy-coated-rebar reinforced concrete beams is basically the same as that of the ordinary reinforced concrete beam. The influence of amount of graphene in epoxy coating on bending properties of beam members is very small. The average crack spacing and short-term maximum crack width formula given in GB 50010—2010 ‘Code for design of concrete structures’ is still applicable to graphene/epoxy-coated-rebar reinforced concrete beams. The calculation of average crack spacing and short-term maximum crack width should be multiplied by a correction factor of 1.15 on the basis of the original formula to consider the increase of crack spacing and width when the tensile reinforcement is graphene/epoxy coated reinforcement.