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Title |
Theoretical Assessment of Limit Strengthening Ratio of Bridge Deck Based on the Failure Characteristic
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Keywords |
교량 바닥판; 보강재비; 항복선 이론; 소성 펀칭전단모델; bridge deck; strengthening ratio; yield line theory; plastic punching shear model |
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Abstract |
In a strengthened bridge deck which received increased service loads, failure patterns of bridge deck vary depending on deck thickness, compressive strength of concrete, yielding strength of reinforcement, reinforcement ratio and additional strengthening ratio. General failure pattern that is most commonly reported as punching shear failure after the main rebar yields, followed by yielding of distributing rebar. In this paper, by Proposing a limit to the amount of strengthening material, a brittle failure can be prevented and a ductile failure mode similar to that developed in unstrengthened deck is derived. In order to calculated the limit strengthening ratio, the yield line theory and previously proposed plastic punching shear model have been used
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