earticle

영어

One of the most accurate earthquake analysis method for the performance evaluation of structure is nonlinear time history analysis, but it is time-consuming and necessitate more efforts. Approximate methods are presented for estimating the capacity of structures while subjecting earthquake ground motions. This is made by exploiting the connection between the nonlinear static response of structure and the dynamic response of SDF system whose backbone matches the structure’s pushover curve. The capacity spectrum method is one of general approximate methods which is based on equivalent linearization where the inelastic deformation is approximated by the maximum deformation of an equivalent linear elastic system having equivalent viscous damping. It requires iterative computations, because the equivalent damping ratio is computed as a function of the maximum deformation. The nonlinear capacity spectrum method estimate the maximum inelastic deformation of SDF system by nonlinear
response spectra. The nonlinear direct spectrum method is proposed and studied to evaluate nonlinear response of structures, without iterative computations, given by the structural linear vibration period and yield strength from the pushover analysis. In this study, it is to compare the accuracy and the reliability of approximate nonlinear methods with respect to upper wall-lower
frame system and various earthquakes.