STUDY ON DAMAGED RC SCHOOL BUILDINGS PAYING ATTENTION TO COLUMNS WITH SIDEWALLS

Abstract

 Firstly restoring force vs. story drift models for columns with sidewalls are proposed paying special attention to the difference of damage level of sidewalls and columns. Secondly inelastic earthquake response analyses using multi-spring story shear models are conducted. Three analysis cases are considered, i.e. failure mode of contribution of column is fixed to flexure, failure mode of contribution of column is calculated and sidewalls were eliminated imaginarily. Main conclusions are as follows: (1)Measured residual seismic performance ratios are roughly evaluated. Especially the difference of measured ratios concerning the members are evaluated. (2)The existence of sidewalls is supposed to be effective to prevent North Building from pancake type collapse damage.