Comparison Between Different Bearing Devices for Cable-Stayed Bridge Using Financial - Comparative Approach
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Sometimes, in designing and constructing bridges, we have to choose a particular structure from different structural variants. One of the essential approaches forbridgesis the seismic risk assessment, by which a judgment can be made by considering damage losses alongside initial project design costs. In cable-stayed bridges, for instance, passive seismic control is performed by placing bearing devices where the deck and pylons connect to eachother. Owners, however, usually refuse to implement more expensive bearing devices despite their superior seismic behavior. As a case study, Mashhad cable-stayed bridge which is located in Iran, uses Pot Bearing device which is not very effective in terms of seismic behavior. Thus, in this paper, implementation of different bearing devices in Mashahd Bridge are comprehenssively compared using seismic risk assessment considering Financial-Comparative approach. Moreover, this paper tries to suggest a more effective, yet economically justified, passive seismic control device than the current Pot Bearing.To do this, we have to design the bridge using different bearing devices including Pot Bearing (PB), Elastomeric Bearing (EB), and Lead Rubber Bearing (LRB), and analyze the seismic behavior of the bridge. Then, the seismic risk assessment can be developed using the proposed method of Cost-Loss-Benefit (CLB) with the Financial-Comparative approach, and the three cases can be compared by defining the Benefit Ratio (BR) as a profitability measure.It can be deduced from the final results that, compared to the current Pot Bearings, both of the alternative bearing devices decrease the losses and increase the costs. However, the BR coefficient indicates the profitability of the use of Lead Rubber Bearings by simultaneously considering costs and losses in the studied bridge.
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