摘要(英) |
The purpose of this thesis is to study double isolated bridge and displacement-based design which is applied to the isolated bridge. Traditional isolated bridge set the isolator on the bottom of pier, while double isolated bridge set the isolator on where the plastic hinge is. The isolator is placed at where the plastic hinge generated on the double isolated bridge, and thus when the bridge impacted by strong motion, the other frame is still linear.
In this study, the simulation of bridge deck displacement and the ground test were compared. The non-traditional double isolated bridge, top isolated bridge, and bottom isolated bridge were modeled with the traditional isolated bridge. The effect under earthquake of each bridge type was simulated by analyzing and comparing different parameters of earthquakes. Moreover, the effect damper, on traditional isolated bridge and double isolated bridge, was also studied. The bridge deck was therefore enabled not to be suffered with significant displacement or unseating when it was impacted by strong earthquake. The safety of the bridge deck was also ensured.
The result demonstrated that the model of double isolated bridge using displacement-based bearing design would gain a group of suitable parameters by using static analysis. However, when we applied these parameters to ground motion, there would be an error between the result of ground motion and of static analysis.
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