Seismic Stability Analysis Of Frame Structures With Rocking Infilled Walls

In the field of engineering,reinforced concrete frame structures are widely used because of their simple structure.It is very common for reinforced concrete frame to collapse during an earthquake.The reason is that the frame structure collapses by the formation of weak layer.Due to user needs,the irregular arrangement of infilled walls is also one of the factors causing the weak layer.In order to solve this problem,the“strong column and weak beam” is clearly defined in <the code for design of concrete structure> in order to avoid the emergence of layer yielding mechanism.But in practice,the form of "strong column and weak beam" is difficult to realize.In view of this situation,based on the principle that the continuous component is good at controlling the distortion of the structure,domestic and foreign scholars put forward the rocking wall frame structure and the rocking infilled wall frame structure to make the frame layer deformation homogenization and avoid inter layer damage caused by deformation concentration.In this paper,based on the previous research,the numerical simulation of SAP2000 is carried out with a five story as an example and considering the common presence of infilled walls to make three kinds of models: pure frame structure,infilled wall frame structure and rocking infilled wall frame structure.Through the nonlinear static analysis and seismic performance comparison of different models,we make analysis on the influence of structural seismic performance stability by the unevenly arrangement of infilled walls along the vertical of structures and the influence on seismic stability of structures by the rocking infilled wall.The analysis results show that the weak layer,bearing capacity,the drift angle between layers and the layer shear of the infilled wall frame structure,when the infilled walls unevenly arranged along the vertical of structure,are different and lack of the stability on seismic performance;the rocking infilled wall frame structure via setting up the rocking infilled wall and weakening the connection between the bottom of the two columns and the foundation to make them “swing” as a whole in the earthquake,to control the deformation of the structure and to make the drift angle between layers more even.The final failure mode of the rocking infilled wall frame structure is the whole body failure and the seismic stability of the rocking infilled wallframe structure is good when the infilled walls unevenly arranged along the vertical of structure.