基于三维数字图像相关技术测量的框架填充墙平面外受力性能研究OA

Out-of-plane(OOP)loading tests were conducted on six full-scale frame infill wall specimens to investigate the effects of the height-to-thickness ratio,block type,and openings of infill walls on their OOP performance.Three-dimensional digital image correlation(DIC)was employed to measure the strain and displacement fields of the infilled walls.The results indicate that the height-to-thickness ratio and block type significantly influence the OOP mechanical behavior of frame infill walls.For aerated concrete infill walls,the initial stiffness and peak load of the specimen with a height-to-thickness ratio of 30 are only 39％and 24％of those of the specimen with a ratio of 15,respectively.The initial stiffness and peak load of aerated concrete wall specimens are only 34％and 31％of those of clay brick wall specimens,respectively.The displacement field test results reveal that the deformation surface of the aerated concrete wall specimen with a height-to-thickness ratio of 15 exhibits a frustum shape,whereas the specimen with a ratio of 30 presents a parabolic shape;in contrast,the clay brick wall specimen exhibits a pyramidal shape.The three-directional strain field test results reveal that during loading,the contributions of the horizontal and vertical load-transfer in the infill walls decrease,while that of the diagonal mechanism increases correspondingly,indicating distinct stress redistribution characteristics.Notably,the diagonal load-transfer mechanism of the clay brick infill walls remains effective even after the horizontal and vertical mechanisms have gradually ceased functioning.