Oil Damper Parameters Optimization And It’s Application

Under the strong earthquake, the superstructure shift and girder falling of simply supported or continuous bridges are the main damage form. If the displacement of the beam can be reduced through the mechanical limit and the increase of damping, it can not only prevent the collision between the beam and the block, but also can prevent the beam from falling. For this purpose, we have developed a new oil damper having a damping and mechanical limit dual function.The author consult the relevant literature of the oil damper in recent years, to understand the progress of the research and it’s applications in this field. Two models(FZ1 and FZ2) oil dampers are designed under the guidance of the principle of "oil flows through the small hole consumption of energy". By special damper parameter tests device, explore the impact of oil hole distribution mode and it’s area on the oil damper force- velocity relationship. The main results of this paper are as follows.1. Summarize and sort out the literature about the research and application of oil damper at domestic and abroad, and have a deep understanding of it’s working principle, design method and manufacturing technology;2. Design two kinds of oil damper, the first one is bypass hole type(FZ1), oil hole section area of which can be changed by manually adjusting the throttle valve. We explore the influence of hole section to oil damper force-velocity relationship by changing the section area of oil hole; and the second one is piston hole type, we explore the influence of different piston hole area to oil damper force-velocity relationship;3. Using actuators(respectively produced by American MTS and China FCS) and the dedicated testing device for horizontal type damper, we conducted pseudo-static tests and got their force-velocity curve for each possible condition of the two oil dampers. According to the test results, the optimal combination of piston bores was discussed, which points out the way for optimizing design;4. Using measured parameters of oil damper,we calculated seismic response of an actual bridge using oil dampers. The results show that the seismic capacity of simply supported or continuous beam bridges can be significantly improved by using the oil dampers rationally.