Tentative calculation of cost-effectiveness based on seismic retrofitting of existing wooden houses

This paper describes the effectiveness of pre-repairing on total repairing cost prepared against earthquakes based on the seismic diagnosis and the seismic retrofit of thirteen existing wooden houses.We investigate the damage level by means of the relative displacement between upper and lower floors obtained by time-domain response analysis.The main results obtained from the investigations are as follows.We show the regression equation between the pre-repairing cost and the disparity evaluated by seismic diagnosis of before and after seismic retrofit.After suffering the seismic damage, the necessary repairing cost of un-repaired house is about two to six times than that of pre-repaired house.This shows the effectiveness of pre-repairing on total repairing cost against earthquakes.Houses which evaluated low mark by seismic diagnosis have more effectiveness on total repairing cost.