| Summary: | 碩士 === 淡江大學 === 土木工程學系 === 92 === Being subjected to a tremendous gravity load from superstructure and the violent lateral shaking during the attack of strong earthquake, the tower of the cable-stayed bridge, designed with esthetic thinking in usual, hence plays a major role for the structural safety. In this research, an elaborated seismic analysis will be undertaken with respect to the cable-stayed bridge protected with several isolators of Lead Rubber Bearings (L.R.B.) located at the conjunction of the tower and the box girder. To make the results more reliable, the influence of soil-structure interaction on the tower will be taken into account thoroughly, and the box girder will be modeled by using degenerated shell elements. Since the moving trajectories of nonlinear isolators would exhibit in an extremely irregular way when the external seismic force acts in a direction not parallel to the symmetric axes of the bridge, the model called as “movable force circle” is developed so as to describe the force-displacement relationship of the isolator appropriately. It is shown in the results that the performance of isolators on base shear reduction is closely related to the content of earthquake and the property of soil.
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