An ideal design of a passive controlled building is that its mainframe maintains its elasticity when subjected to ground motions. However, it is necessary to consider the plastic behavior of the mainframe of passive control building when designing for there might be seismic ground motions exceeding the assumptions. Additionally, it is necessary to evaluate the accumulated damage of the damper from several repetitive oscillations when long-period and long-duration ground motion occurred.
In one of the seismic structural design methods, there is an energy balance-based design method for earthquake-induced response of building that was proposed. This method can judge earthquake resistance of building handily and its general situation, and is very useful for evaluating the cumulative damage of mainframe and dampers. However, this energy balance-based design method assumes great transformation that may result to excessive response evaluation when the building mainframe is slightly plastic or has small plastic deformation – for example, response of a passive controlled building with hysteretic dampers.
This paper, therefore, proposes an energy balance-based response prediction method considering the extent of plastic deformation of the mainframe of the passive controlled building with hysteretic dampers. Chapter 2 presents the proposed reduction rates of the number of equivalent repetitions for dampers according to the extent of plasticity of the mainframe. Chapter 3 discusses the prediction method of the maximum story drifts considering the extent of plasticity of the mainframe is proposed. Chapter 4 examines the validity of the proposed method by comparing it with the time history analysis. Chapter 5 clarifies the effect of the number of equivalent repetition, damage dispersion coefficient and the yield shear force of the mainframe on the evaluation of the maximum response value.
The findings obtained are shown below.
(1) It is confirmed that the proposed reduction rate of the number of equivalent repetition for the damper due to the extent of plasticity of the mainframe roughly agrees with the results obtained from the time history analysis.
(2) The response prediction method of the first story considering the degree of plasticity of the building mainframe is derived using the yield shear force coefficient ratio of the building mainframe, the number of equivalent repetition for the mainframe and damper, and the damage distribution coefficient of the mainframe and damper. It is confirmed that this proposed response prediction method corresponds to the result of the time history response analysis.
(3) Various response evaluation curves in which the yield shear force coefficient ratio of the mainframe, the number of equivalent repetition for the mainframe and damper, and the damage distribution coefficient of the mainframe and damper are presented in this paper. This study verifies the influence of these parameters exerted on the response.
