DOWNSIZING OF MEMBERS THROUGH NUMERICAL ANALYSIS OF STEEL MULTI-STORIED FRAME WITH PASSIVE FRICTION DAMPERS AT BASE

Abstract eng:
In this paper, the vibration control systems using passive dampers settled at the base of steel buildings with the effect of reducing the total steel weight of multi-storied frames with sliding bearings is investigated. The passive friction is one of the vibration control device that is important to use the technology to prevent or minimize damage to buildings[1], and the device can dissipate the seismic energy by sliding during an earthquake excitation. This research address vibration control system permits the downsizing of members of the steel super-structure, which reduces the total steel weight. The first story of the building could contribute to base-isolation because of the passive friction dampers at the bottoms of some columns. Two steel frames were simulated for the research by using OpenSees. The first consisted of large-sized columns and beams while the other utilized smaller member sizes. Both steel frames used columns in the first story equipped with passive friction dampers, which were connected at the base with side-by-side columns. A series of numerical simulations was conducted and the results were compared regarding the inter-story drift angle, slide deviation and seismic energy under earthquake excitations. Finally, results from the numerical analyses of the effect of the base-isolation on the total weight reduction of the multistoried steel frame were summarized.

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