玄武岩格栅增强ECC复合材料反复荷载作用下本构关系模型

Constitutive model of basalt fiber reinforced polymer grid reinforced engineered cement composite under cyclic loading

为了研究玄武岩格栅增强水泥基复合材料(ECC)反复荷载作用下的力学性能,考虑玄武岩纤维复材(BFRP)格栅层数和加卸载循环方式,对玄武岩格栅增强ECC薄板试件进行了单轴反复拉伸试验。试验结果表明:玄武岩格栅与ECC复合,充分发挥了玄武岩格栅的材料性能,进一步提高了基体ECC的延性。随着玄武岩格栅层数的增加,玄武岩格栅增强ECC的极限抗拉强度显著增大。依据试验结果建立了反复荷载下玄武岩格栅增强ECC的本构关系模型。计算结果表明:该模型可以有效地预测反复荷载下玄武岩格栅增强ECC的应力-应变关系、极限抗拉强度、极限拉伸应变和残余塑性应变。

In order to research the mechanical properties of basalt fiber reinforced polymer（ BFRP）reinforced engineered cementitious composite（ ECC） under cyclic loading,an axial tensile experimental program was conducted by considering the factors involving BFRP grid layer and loading/unloading cycle scheme.The test results indicate that the property of internal BFRP grid in the composite material can be well utilized,and the BFRP grid could further improve the ductility of ECC.The ultimate tensile stress of reinforced composite can get greatly improvement with the increase in BFRP grid reinforcements.Based on the experimental results,a stress-strain model of BFRP grid reinforced ECC was established. The analysis results show that the established model can effectively predict the stress-strain relationship,the ultimate tensile strength,the ultimate tensile strain and the plastic residual strain of BFRP grid reinforced ECC under cyclic loading.