According to the results of a beam structure analysis of the deck subjected to rubble mound movements through soil springs by Minami et al. [8], the structure hinging initially occurred at the heads of the sea-side and the land-side piles and at the lower portion which corresponded to the depth of the liquefiable layer of the middle pile, and then the hinging came to the lower portion of the sea-side and the land-side piles.