기대 총 건설비 및 허용 활동량을 고려한 방파제 케이슨의 최적설계
Opitmal Design of Breakwater Caisson Considering Expected Total Construction Cost and Allowable Sliding Distance
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본연구에서는직립방파제케이슨의활동량산정모델과케이슨복구비용계산모델을결합하여기 대총건설비산정모델을수립하였다. 직립방파제케이슨의최적단면은활동량의허용범위내에서기대 총건설비가최소가되는단면으로정의된다. 활동량의허용범위는방파제수명동안의기대활동량을 0.1 m로하는경우와방파제수명동안의누적활동량이 0.3 m를초과하는확률을 0.1 이내로하는경우를고려하였다. 또한할인율개념을도입하여미래가치로산정된복구비용을현재가치로환산하였다. 작은재현주기에대해서설계된케이슨의경우잦은복구활동으로인해할인율을적용했을때의기대총건설비용이할인율을적용하지않았을때보다작아진다. 수심이얕을때본설계법이기존의결정론적설계법보다더작은단면을요구하여경제적인설계가가능하다. 한편, 수심이얕을때는전술한활동량허용기준들이비슷한결과를나타내지만, 깊은수심에서는전자가후자보다더큰단면을요구한다.
Abstract
combing a model to calculate the sliding distance of a caisson of a vertical breakwater and a model to calculatethe rehabilitation cost of a caisson. The optimal cross-section of a caisson of a vertical breakwater is defined asthe cross-section that requires a minimum expected total construction cost within the allowable limit of caissonsliding. Two allowable limits are considered: 0.1 m of the expected sliding distance during the lifetime of thebreakwater and 0.1 of the probability that the cumulative sliding distance during the lifetime of the breakwater isgreater than 0.3 m. A discount rate has also ben introduced to convert the future rehabilitation cost to the presentvalue. The introduction of the discount rate reduces the expected total construction cost for the caissons designedsection than the conventional deterministic method in shallow water depths, enabling us to design a caisson moreeconomically. On the other hand, the above-mentioned allowable limits of caisson sliding show similar resultsfor smaller water depths, while, for larger depths, the former requires a larger cross-section than the latter.
참고문헌 (10)
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