Abstract
Caces of earthquake damage to gravity quaywalls were collected for past earthquakes, and the quantity of earthquake damage which means the residual displacement after earthquakes and the cost of damage was then analyzed. An estimation method to give this quantity of the damage (residual displacement and cost) was presented, using the empirical equation which is the function of the ratio of the corresponding seismic coefficient of the ground acceleration to the seismic coefficient which gives the safety factor of unity in the stability analysis of the design standard. An optimum seismic coefficient from an economical viewpoint and an allowable residual displacement which was defined as an expected seismic damage displacement given by such optimum seismic coefficient were then studied for the rational seismic design, on the basis of the quantitative estimation method of the cost of damage.
