In this study, it is suggested that an earthquake-proof ceiling frame is capable of reducing the input earthquake to the ceiling frame, and is performed the variable analysis of the horizontal and vertical directions affecting the response of the ceiling frame. As the result of this study, the following conclusions are drawn as follows;
(1) Linear member was used for the modeling of the ceiling frame. The intersection point of the ceiling frame grid module was loaded. The ceiling frame is modeled with a 1-dimensional multi-degree of freedom mass system. Based on this model, the seismic response analysis method was performed for the horizontal and vertical directions.
(2) The seismic response analysis was conducted when the ceiling frame was placed on the wall moldings without specific binding just as actual ceiling frames. As a result, the higher floors have larger amplification of acceleration response of the ceiling frame, as compared to the input acceleration. There is also a larger displacement response with the higher floors.
(3) In order to reduce the seismic load on the ceiling frame, seismic response analysis was performed by setting the stiffness ratio of the ceiling frame connecting member as a variable. If the stiffness ratio of the connecting member was less than 0.01%, the ceiling frame response acceleration was less than the input acceleration.
(4) As a result of conducting a variable analysis about weight, damping ratio, stiffness, and scale of input acceleration of the ceiling frame, the heavier ceiling frame showed that the acceleration was amplified when the stiffness of the connecting member is increased. In the case of the damping ratio, the stiffness ratio of the connecting spring was amplified in the section between 0.01% and 0.1% regardless of the scale of the damping ratio.
(5) As a result of the analysis according to the scale of stiffness of the ceiling frame and the scale of input acceleration, the stronger stiffness of the ceiling frame showed a stronger stiffness of the connecting member, so amplification occurred in a section between 0.01% and 0.1% of the stiffness ratio of the connecting spring regardless of the scale of input acceleration.
(6) As for the vertical direction, no amplification change was found in acceleration and displacement according to node locations. Variable interpretation also found little effect on ceiling frame response of variables according to the axial rigidity and bending rigidity of the connection part.