부벽식 옹벽의 내진 최적설계
Optimal design of counterfort retaining wall for seismic protection
부벽식 옹벽 내진 최적설계;
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The main purpose of this study is to develop and present a total optimum design program which can not only perform an seismic protection analysis but also the optimum design at the same time based on the current specifications for a reinforced concrete retaining wall under normal load and earthquake load. When we carry out an seismic protection analysis, we use ordinary pressure which calculated by Column Formula and earth pressure which calculated by Mononobe-Okebe's Formula. Also we use the cross-section size and the cross-section area of a steel as the design variables. In the view of the results that we perform an optimum design of counterfort retaining wall under normal load and earthquake load by using the optimum design program developed in this study, the solution is came close to the optimum solution by just four times repeated performances, so that we can know that the program is efficient and the convergency of the program is fine. In this study, minimum expenses of concrete and steel calculated by a combination of each design variables is used as an objective function, and we can know that material expenses of the concrete and steel is reduced about 9∼10%, and the bottom board length rotio is reduced about 3∼5%, and counterfort wall gap length ratio is reduced about 2% by the design variables which is convergent to the initial value and the optimum solution.