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O'Connor, Alan
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O'Connor, Alan
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O'Connor, Alan
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- PublicationEffects of Traffic Loads on Road Bridges - Preliminary Studies for the Re-Asessment of the Traffic Load Model for Eurocode 1, Part 3.WIM has developed greatly in the last ten years and confidence in the accuracy of recorded data has increased significantly. Traffic data recently obtained from a number of representative European sites are used to re-calibrate the codified main load model of the European bridge loading code, Eurocode 1 Part 3. A wide range of real and virtual bridge forms were chosen for the study. Simulations were performed using free-flowing and jammed traffic. Load effects generated were determined and statistical extrapolations were performed, where appropriate, to determine characteristic values for the load effects. Some of the assumptions used in the derivation of the original loading model were reassessed.
883 - PublicationDirect and Probabilistic Interrelationships between Half-Cell Potential and Resistivity Test Results for Durability Ranking(2012-07-21)
; ; Tests related to durability studies on structures often feature half-cell potential and resistivity data. An approximately linear relationship between half-cell potential testing and resistivity data has been discussed and well-researched. In spite of criticisms related to environmental sensitivity of resistivity tests it remains as a popular choice for investigations into durability of structures. This paper investigates the correlation between half-cell potentials and resistivity tests on reinforced concrete from field data from tests on six bridges. The empirical interrelationships from the six bridges with widely varying environmental exposure conditions and the variation of such interrelationships are observed. Similar investigations are carried out on different elements of bridges. The paper then discusses problems related to the interpretation and practical application of correlations carried out on absolute values and advocates the use of statistical measures obtained from test data. The percentile correlations are observed to be helpful when considering exceedances of different threshold values. A customised use of such data in an empirically correlated probabilistic format with can be useful in durability ranking and infrastructure maintenance management. The studies presented in this paper emphasize the advantages of using probabilistic formats over traditional formats when interpreting or quantitatively establishing field relationships between half-cell potential and resistivity data. The ability of this empirically correlated probabilistic format to support structure-specific thresholds of serviceability limit states is discussed. The need for a shared repository for the improvement of accuracy of such correlations and for the use of such correlations as a surrogate for other structures is emphasized.318 - PublicationProcedures for the assessment of highway structures(Institution of Civil Engineers / Thomas Telford Publishing, 2005-02)
; ; ; ; Bridges, earth retaining walls and buried structures make up a substantial proportion of the fixed assets of the land based transportation infrastructure within Europe. Little work has been done on the development of documents covering the assessment of highway structures compared to the design of new structures. This paper describes an approach to assessment developed through working groups 4 and 5 of the European COST (Co-Operation in Science and Technology) Action 345, ‘Procedures required for assessing highway structures’. This Action was supported by the European Commission and involved experts from 16 European countries. The ICE Trust fund has supported a study of a road bridge in Vienna to demonstrate the applicability and potential benefits of the approach developed through COST 345. The approach is similar to that used in the UK in that there are five levels of assessment of increasing complexity and reliability, but there are a number of differences. This paper describes the approach developed through COST 345 with a view of opening the debate on the need for a code of practice for assessment that facilitates the use of site-specific loading.1486Scopus© Citations 21 - PublicationReport of Current Studies Performed on Normal Load Model of EC1-Part 2. Traffic Loads on Bridges, 5(4),This report gives results of some new studies performed to validate the European road traffic load model proposed by the Eurocode EC1. Weight in motion has developed greatly in the last ten years and confidence in the accuracy of recorded data has increased significantly. Traffic data recently obtained from a number of representative European sites are used to re-calibrate the codified main load model of the European bridge loading code, Eurocode 1 Part 3. A wide range of real and virtual bridge forms were chosen for the study. Simulations were performed using free-flowing and jammed traffic. Load effects generated were determined and statistical extrapolations were performed, where appropriate, to determine characteristic values for the load effects. Some of the assumptions used in the derivation of the original loading model were re-assessed.
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