框架阻尼填充墙平面外受力性能分析研究

OUT-OF-PLANE MECHANICAL PROPERTIES ANALYSIS OF DAMPED INFILL WALL FRAME

通过有限元方法,对比分析普通填充墙与阻尼填充墙在平面外单调静力荷载作用下各主要构件的响应,研究阻尼填充墙平面外受力性能,揭示阻尼填充墙平面外工作机制。分析结果表明：平面外荷载作用下,阻尼填充墙出平面侧移量集中于中间两层阻尼层,从墙侧移看,阻尼填充墙出平面变形区别于普通填充墙变形模式,其为＂图7可知普通为三折线,阻尼填充墙为三折线＂变形模式;阻尼填充墙平面外工作机制具体表现为：竖直方向为拱承载机制,水平方向为砌体单元与拉结筋协同受弯工作的工作机制;在平面外受力过程中,顶层、底层砌体单元与其相邻的混凝土框架梁之间的相对滑移现象显著降低了阻尼填充墙平面外承载能力及其刚度。加强砌体单元与顶梁、底梁间的相互作用是保证阻尼填充墙平面外性能的关键。

In the paper,the behavior of the main components of conventional infill wall（CIW） and damped infill wall（DIW） were analyzed comparatively under out-of-plane monotonic static loading by the finite element method. With the analysis results,the out-of-plane mechanical properties of DIW were studied and the working mechanism of DIW was revealed. The results showed that the out-of-plane（OOP） deformation of DIW mainly focused on the middle two damping layers and its OOP deformation pattern was a trilinear curve which was different from CIW. The OOP working mechanism of DIW could be concluded that,the OOP loading was mainly born by arching in the vertical direction and the bending capacity of both masonry and tie bars in the horizontal direction. The OOP bearing capacity and OOP stiffness were decreased significantly as the result of the sliding between RC beams and the adjacent masonry units. It was the key to ensure the OOP performance by strengthening the interaction between top,bottom masonry and its adjacent RC beam.