Abstract
Water distribution station is an important facility for storing drinking water which adjust to the time variation of the water supply. Underground distribution reservoirs are low-rise structures and often surrounded by six walls which are ceiling, side and floor. So the deformation suppressing effect is expected. Since tow-dimensional calculation is more simple and the result of the calculation is accurate compared to third-dimensional analysis, two-dimensional analysis model has been used as a standard for design in production level. When the shape of the lined up cross section is the same, accurate calculation result is obtainable using two-dimensional analysis. Although if the shape is complex, it is difficult to get the right result. The case study for large-scale reinforced underground concrete distribution reservoir which is divided in blocks and has a complex placement of seismic resistance walls has been studied. The case study comprises two analyses that are two-dimensional static analysis and three-dimensional static analysis which we compared and analyzed the both results. The result of the study tells us that the applicability of three-dimensional static analysis is reasonable. Also the result shows that it is difficult to simulate the structures accurately using two-dimensional static analysis and the cost of reinforcement works will be high. On the other hand the model analyzed using three-dimensional static was showed as a more reasonable design plan.
