The new examining method of bearing capacity for eccentric and inclined loads, which is introduced into Technical Standards for Port and Harour Facilities (Bureau of Ports and Harbours, Ministry of Transport, Oct.1988), is applied to the optiumum desing method for composite breakwater which was developed previously. Furthermore, the optimum design method for caisson gravity type quaywall is developed the following matters are studied.
(1)Penalty Function is Sequential Unconstratined Minimaization Tcehnique which is the optimizing technique introduced into the optimum design method is determined.
(2)The safety factor of bearing capacity for eccentric and inclined loads is approximated with Spline Function.
(3)The rate, at which Penalty Parameter used to optimaize the cross sections decreases, is determined. Furthermore, we studied about the method how to take the initial values of Penalty Parameter and variables used to calculate the safety factor on circular faliure.
(4)Two examining methods of bearing capacity for eccentric and inclined loads, which are Bishop method and the method that we often combine Load Distribution method and Katayama & Uchida method, are compared.