Abstract
Shaking table tests are carried out to validate the analytical solutions for the sloshing in a floating-roof type cylindrical liquid storage tank under seismic excitation. The experimental tank is made of acrylic tube of 780mm in diameter. Free oscillation as well as seismic excitation tests are performed using three types of floating roof model, i.e., a uniform isotropic plate, a single-deck type floating roof composed of an inner deck and an outer pontoon, and a floating roof composed of a pontoon ring only. The optical motion capture system using CCD cameras is employed to measure the roof displacements distributing over the whole roof surface. The test results are compared with the analytical solutions based on linear potential theory. Overall agreement is confirmed between theory and experiment, while nonlinear oscillation modes due to the effect of finite-amplitude liquid motion as well as large deflection of single deck are observed to occur.
