高强不锈钢绞线网增强工程水泥基复合材料受拉应力-应变关系

为了研究高强不锈钢绞线网增强工程水泥基复合材料(Engineered cementitious composites，EEC)的受拉性能，考虑高强不锈钢绞线配筋率、ECC抗拉强度、高强不锈钢绞线网增强ECC试件宽度3个影响因素，对设计的27个高强不锈钢绞线网增强ECC试件进行了单轴拉伸试验。试验结果表明，高强不锈钢绞线网增强ECC受拉试件的开裂应力和极限应力随着钢绞线配筋率、ECC抗拉强度的增大而增大；增大试件宽度对试件的开裂应力和极限应力几乎无影响。基于试验结果，提出并建立了高强不锈钢绞线网增强ECC受拉本构模型，推导了开裂应力和极限应力计算公式。经验证，计算结果与试验结果吻合良好，说明所建立的受拉本构模型可准确描述高强不锈钢绞线网增强ECC的受拉应力-应变关系。 

Tensile stress-strain relationship of engineered cementitious composites reinforced by high-strength stainless steel wire mesh

In order to study the tensile performance of the engineered cementitious composites (EEC) reinforced by high high-strength stainless steel wire mesh, the parameters of reinforcement ratio of high-strength stainless steel stranded wire, tensile strength of ECC and width of ECC reinforced by high high-strength stainless steel wire mesh specimen were considered, and the uniaxial tensile tests of total of 27 test pieces were carried out. The test results show that the cracking stress and ultimate stress of the specimens increase with the increase of the steel strand reinforcement ratio and ECC tensile strength. The crack stress and ultimate stress of the specimens are almost not affected by increasing the width of the specimen. Based on the test results, the tensile constitutive model of high-strength stainless steel stranded wire mesh reinforced ECC and the formulas for calculating the cracking stress and ultimate stress were proposed. It is proved that the calculated results are in good agreement with the experimental results, which indicates that the established tensile constitutive model can accurately describe the tensile stress-strain relationship of ECC reinforced by high-strength stainless steel wire mesh.