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Calculation of the dynamic allowance for railway bridges from direct measurement

Connolly, L., Hajializadeh, D., Leahy, C., O'Connor, A., O'Brien, E.J. and Bowe, C. (2016) Calculation of the dynamic allowance for railway bridges from direct measurement In: Railways 2016: The Third International Conference on Railway Technology: Research, Development and Maintenance, 2016-04-05-2016-04-08, Sardinia, Italy.

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In a traditional deterministic assessment, a dynamic amplification factor (DAF) is applied to the static loading in order to account for dynamics. The codified DAF values are appropriately conservative in order to consider the wide range of structures and load effects to which they are applied. In the current analysis, a site specific assessment dynamic ratio (ADR) is calculated from direct measurement on an eighty year old steel truss railway bridge. The ADR is defined as the ratio of characteristic total stress to the characteristic static stress. The application of an ADR is a relatively new concept which has rarely been considered for railway bridges. An assessment performed on the bridge in question showed a decrease in the dynamic allowance when considering the site specific ADR, corresponding to a twenty-six percent decrease in the calculated stress. The measurements available were also used to derive a robust stochastic model for dynamic allowance which considered the correlation between DAF and stress level. The developed model was applied to a probabilistic assessment and resulted in a nine percent increase in reliability. © Civil-Comp Press, 2016.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Connolly, L.
Leahy, C.
O'Connor, A.
O'Brien, E.J.
Bowe, C.
Date : 2016
Uncontrolled Keywords : Assessment, Assessment dynamic ratio, Bridge, Dynamic amplification factor, Dynamics, Filter, Monitoring, Probabilistic, Reliability, Signal, Truss, Vibration, Amplification, Bridges, Dynamic loads, Dynamics, Monitoring, Railroad bridges, Railroads, Reliability, Signaling, Steel bridges, Stochastic models, Stochastic systems, Transportation, Trusses, Assessment, Assessment dynamic ratio, Dynamic amplification factors, Filter, Probabilistic, Vibration, Electric measuring bridges
Depositing User : Diane Maxfield
Date Deposited : 25 Mar 2019 11:20
Last Modified : 26 Mar 2019 10:22

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