纤维增强水泥基复合材料(ECC)面层加固砌体墙的压剪性能研究

ANALYSIS OF DIAGONAL SHEAR BEHAVIOR OF MASONRY WALL STRENGTHENED WITH ENGINEERED CEMENTITIOUS COMPOSITES(ECC)

为研究纤维增强水泥基复合材料(engineered cementitious composites,ECC)加固砌体结构后的压剪性能,对1片未加固砌体墙和6片ECC面层加固砌体墙进行了对角加载试验,分析了单、双面加固形式和面层厚度对墙体抗剪承载力的影响。进行了ECC加固砌体墙有限元模拟,与试验结果对比并进行参数分析。结果表明:ECC面层可显著提升砌体墙的抗剪承载力和变形性能,改善墙体的抗震性能;面层厚度、砂浆强度、ECC抗拉强度参数对墙体承载力影响显著,可为实际工程设计参数选取提供理论基础。提出了满足现有规范对墙体变形限值要求的ECC材料延伸率需求,以期为ECC加固砌体结构基于性能的抗震设计提供初步的理论支撑。

In order to study the diagonal shear behavior of masonry structures strengthened with engineered cementitious composites(ECC),diagonal loading tests were carried out on one unreinforced masonry wall and six masonry walls strengthened with ECC layer.The effects of strengthened forms(strengthened with single-sided or double-sided ECC layer)and the thickness of ECC layer on the shear bearing capacity of the masonry wall were analyzed.The finite element analysis models of strengthened masonry walls were established and analyzed.Then the simulation results were compared with the experimental results.Parametric analysis was also carried out using the models.The results show that the ECC layer can significantly improve the shear capacity and deformability of masonry walls.The ECC layer thickness,mortar strength and ECC tensile strength parameters have significant effects on the bearing capacity of the wall,which can provide a theoretical basis for the selection of actual engineering design parameters.The elongation demand of ECC materials that meet the deformation limit requirements of walls in the existing codes is proposed in order to provide preliminary theoretical support for the performance-based seismic design of ECC reinforced masonry structures.