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Author

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Koleksi
Proceedings

Publisher
International Symposium on Reliability of Multi-Disciplinary Engineering System under Uncertainty 2019

A single span bridge with rubber bearing as the support system analyzed to observe the effect of variation of friction coefficient on both surface friction between deck-support and support-column cap beam. Two range of friction coefficient have been studied, in range of 0,2 – 0,4 based on CALTRANS Design Code and 0,35 – 0,5 based on Experimental Result. A rubber bearing system applied in a bride without any anchor system, the correlation of the friction force and the shear force on top and bottom surface friction of the rubber bearing system will much more important to observe to avoid the excessive sliding displacement which increase the possibility of bridge falling under the earthquakes. Less number of friction coefficient allows the system to move more flexible, but the high number of friction force will limit the sliding displacement which cause the rubber working more in absorbing the energy. Thus, the purpose is to observe which range of friction coefficient that preferable to choose correlated with the percentage of energy absorptions. Rubber bearing system as mentioned is a bearing which combine rubber element and friction surface interconnection between bearing-deck (Top surface friction) and bearing-column (bottom surface friction). Many researchers assumed a rubber bearing system into 1 link which have rubber and friction parameter altogether, this way is possible and commonly used in many research, but to find how many contribution of each element to respond the external force may be difficult to analyze. Functional Bearing Model (FBM) is how to analyze the rubber bearing system in several links based on how many constituent element on it. This research is an improvement idea of the previous FBM concept which proposed by Liu, et al. on 2013, take an anchor system on the bottom surface friction, they assumed the rubber bearing system into two links consist of rubber element and top srface friction element. Here proposed three links assumption, by means there is no anchor system on the rubber bearing system. These three springs are: top surface friction link, rubber link, and bottom surface friction link. It was inspired on the recent conditions, that many bearing put in beetween column and deck without any anchor system make the bearing easy to remove when it broken due to the failure which mostly happens on the bearing system as the structure weak element. Make sure these idea is suitable for the bridge analysis with compare the deck displacement and deck acceleration of both experiment and FBM 3 links analysis. Observing the result are close each other, thus FBM 3 springs is properly used in determining the rubber bearing system. Put variation of the friction force on both friction elements, proven that variation of the friction force may take several contribution for the rubber bearing respond. In cummulative displacement of column drift, bottom sliding displacement, rubber deformation, top sliding displacement, and deck displacement. Rubber take 25% in contributing the displacement. In cummulative,

URI
https://repo.itera.ac.id/depan/submission/SB2102220003

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