Abstract
This paper shows two methods of reducing from a single-story asymmetric building under uni-directional earthquake motion to the equivalent single degree of freedom system (ESDOF) to improve the capacity spectrum method used in the calculation of response and limit strength provided in the Building Standard Law Enforcement Order of Japan. One is the static reducing method with mode-adaptive pushover analysis and the other is the dynamic reducing method using modal decomposition procedure together with earthquake response analysis. Applying both methods for four types of single-story RC buildings with different eccentricity, the validity of the methods and the earthquake response characteristics of ESDOF system are examined. Based on the latter method, an evaluation method of the higher mode effect in story responses is also proposed.
