Calculation of the Dynamic Allowance for Railway Bridges from Direct Measurement

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Title: Calculation of the Dynamic Allowance for Railway Bridges from Direct Measurement
Authors: Connolly, L. C.
Hajializadeh, Donya
Leahy, Cathal
O'Connor, Alan
O'Brien, Eugene J.
Bowe, Cathal
Permanent link: http://hdl.handle.net/10197/9243
Date: 8-Apr-2016
Abstract: 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 80 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 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 26% decrease in 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 9% increase in reliability.
Type of material: Conference Publication
Publisher: Civil-Comp Press
Keywords: Dynamics;DAF;ADR;Truss;Bridge;Probabilistic;Assessment;Reliability;Monitoring;Vibration;Signal;Filter
DOI: 10.4203/ccp.110.138
Language: en
Status of Item: Peer reviewed
Is part of: Pombo, J. (ed.). Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance
Conference Details: Railways 2016: The Third International Conference on Railway Technology: Research, Development and Maintenance, Sardinia, Italy, 5-8 April 2016
Appears in Collections:Civil Engineering Research Collection

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