BASIC STUDY ON MODELING METHOD CONSIDERING SEISMIC INTERACTION BEHAVIOR OF BRIDGES AND VIADUCT GROUPS

Abstract

 Construction of a 3D frame model is effective as a method of analytically evaluating the entire structural system, and there are many examples of evaluating a specific group of structures. However, in design practice, it is necessary to consider the number of degrees of freedom of the model in order to evaluate the seismic interaction behavior of long bridges and viaducts. Therefore, we investigated a modeling method that can express the seismic interaction behavior of bridges and viaducts simply and appropriately. Specifically, based on the model of the design vibration unit used in seismic design, a simple frame model was constructed by connecting them, and the response was compared with the 3D frame model by frequency response function and response waveform. As a result, it was found that the frequency response function and response waveform can be roughly expressed even with a simple model in which columns and frames are aggregated into mass points, if the rotational behavior around the vertical axis at the bearing is expressed.