高延性混凝土加固震损砌体结构振动台试验研究

SHAKING TABLE TEST ON DAMAGED MASONRY STRUCTURE REINFORCED WITH HIGH DUCTILE CONCRETE LAYER

为研究高延性混凝土(HDC)面层加固震损砌体结构的抗震性能,该文对一栋缩尺比为1∶2的两层村镇砖砌体房屋模型依次在未加固、采用钢筋网水泥砂浆和高延性混凝土加固三种情况下进行振动台试验,分析了HDC加固震损砌体结构的动力特性、加速度反应、位移反应、扭转效应和破坏形态。试验结果表明:采用HDC面层加固法可以显著提高震损砌体结构的耐损伤能力、变形能力和整体刚度,延缓结构刚度退化,有效传递水平剪力;采用HDC面层加固能有效抵抗结构因质量中心和刚度中心不重合引起的扭转效应;采用HDC面层加固震损砌体结构,其抗震性能明显优于钢筋网水泥砂浆面层加固,可大幅减轻砌体结构在8度及以上地震动下的损伤。

To study the seismic performance of damaged masonry structures reinforced with High Ductility Concrete(HDC),a two-storey masonry store model with a scale ratio of 1/2 was tested on shaking table for three cases:unreinforced,reinforced using steel-meshed cement mortar and reinforced using HDC.The dynamic characteristics,acceleration response,displacement response,structural torsion and failure pattern of HDC reinforced masonry structure were analyzed through comparisons of the three cases.The experimental results show that the HDC surface-layer reinforcement can significantly improve the damage tolerance,deformation ability and overall stiffness of masonry structure,delay the declination of structural stiffness and effectively transfer the horizontal shear force.The HDC surface-layer reinforcement can effectively resist structural torsion caused by the dislocation of mass center and stiffness center.Reinforced with HDC surface layer,the seismic performance was obviously better than that reinforced using steel-meshed cement mortar.The HDC surface layer can greatly reduce the damage degree of masonry structures subjected to the earthquake with intensity of 8.