Evaluation Method of the Life-Cycle Cost of Quay Walls in View of Earthquake Resistance

Abstract eng:
This study aims at proposing an evaluation method of the life-cycle cost of quay walls in view of earthquake resistance. Major failure mode of quay walls by earthquake is the occurrence of undesirable amount of residual displacement. Therefore, probabilistic residual displacement of quay walls should be evaluated in the life-cycle cost analysis of quay walls. As quay walls are earth retaining structures that are subjected to earth pressure, residual displacement of quay walls is generated mainly by the deformation of the foundation soil layers. The problem in the evaluation of the residual displacement of quay walls is the fact that the residual displacement is generated mainly by the deformation in the foundation soil layers and is not easy to be calculated. It is necessary to conduct two-dimensional effective stress finite element earthquake response analysis for the precise evaluation of residual displacement of quay walls. However, as the application of that kind of analysis is time consuming, it is not a practical idea to apply such kind of method for the evaluation of the probabilistic residual displacement of quay walls because designers must conduct the analysis many times in order to evaluate the probabilistic residual displacement. Authors apply one-dimensional effective stress finite element earthquake response analysis for the evaluation of residual displacement of quay walls whose computational load is much less compared with the two-dimensional analysis. Authors next proposed a method to evaluate the damage cost of quay walls considering both repair cost after earthquake and economic loss cost. As the repair cost varies according to the dimension and residual displacement of quay walls, authors established the equations for the calculation of repair cost considering the dimension and residual displacement of quay walls for each structural type. Authors also established the equations for the calculation of the economic loss cost according to the kind and total amount of cargo for the wharf and the condition of detour route for cargo transportations during the closing period of the wharf. Authors finally showed some examples of the evaluation of life-cycle cost of quay walls by the proposed method.

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