Determination of Optimal Width of Breakwater Caisson by Reliability Based Design Optimization

vertical caisson;system reliability;FORM approximation;minimization of expected total lifetime cost;harmony search;624

Taek Sang Kim공과대학 건설환경공학부 ;

University:서울대학교 대학원

关键词: vertical caisson;    system reliability;    FORM approximation;    minimization of expected total lifetime cost;    harmony search;    624;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/124349/1/000000141130.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

This research uses the FORM (First Order Reliability Method) approximation which is one of the system reliability methods, to calculate the failure probability of the vertical caisson of a composite breakwater and determines the optimal width of the caisson by reliability based design optimization. Five different breakwater cross-sections (one fictitious breakwater in a textbook and four different sections of the breakwater in Shibushi, Japan) and four wave conditions (one wave condition in a textbook and three wave conditions of the Shibushi breakwater) are used in this research. In order to express the limit state function, six different random variables are used. The limit state function is approximated by a normal distribution and the failure probability considering both sliding failure and tilting failure is obtained from the FORM approximation. After calculating the failure probability, the function of expected total lifetime cost is formulated by incorporating the results of system reliability analysis in the economic analysis. Finally, the optimal width of the vertical caisson of the breakwater is obtained by minimizing the expected total lifetime cost using the harmony search algorithm.