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Bridge Structures, Vol. 1, No. 2, June 2005, 67 The lead article in this issue of Bridge Structures is a paper by Itani et al. on the ââAnalysis of R/C decks in box girder bridges under rational wheel load distributionsââ. The deck bending moments were investigated for typical box girder bridges with various overhang widths and girder spacings. The study concludes that the eï¬ective widths speciï¬ed in the AASHTO speciï¬cations are the main cause of the large diï¬erence between the ï¬nite element analysis and the AASHTO deck transverse moments. Integral abutment construction represents a feasible mechanism to transfer the temperature and traï¬c-induced horizontal loading of bridges. In ââA survey of current issues on the use of integral abutment bridgesââ, Hassiotis and Roman summarize the developments in the design criteria, as well as ongoing laboratory and full-scale experimental work on integral abutments. Also on the theme of integral abutments, William et al. report on the use of data collected from an instrumented integral abutment bridge. The ï¬eld measurements were used to evaluate the performance of integral abutment bridges and to check the validity of the design assumptions. The data collected indicated that integral abutments resist the expansion of the bridge superstructure during summer time, and this leads to excessive axial compressive forces in the steel girders. In the United States, trucks are typically allowed unrestricted operation and are generally considered âlegalâ provided that they meet the weight guidelines of the Federal Bridge Formula B. The Federal Bridge Formula calculates the maximum allowable load that can legally be imposed on the bridge by any group of two or more consecutive axles on a vehicle or combination of vehicles. The trucking industry has recently introduced Specialized Hauling Vehicles with new axle conï¬gurations that satisfy the Federal Formula, but may be severely overstressing some non-posted bridges. The new axle conï¬gurations initiated a federally funded research project to investigate the recent developments in specialized truck conï¬gurations and state legal loads, and to recommend revisions to the legal loads for posting as depicted in the AASHTO bridge evaluation manuals. In his paper, ââRecommendations of a new truck model for bridge evaluationââ, Sivakumar discusses the preliminary ï¬ndings of the research project. Khaled M. Mahmoud, Editor-in-Chief Bridge Technology Consulting & Engineering, New York City, USA Bridge Structures ISSN 1573-2487 print/ISSN 1744-8999 online ª 2005 Taylor & Francis Group Ltd http://www.tandf.co.uk/journals DOI: 10.1080/15732480500235327
Bridge Structures – IOS Press
Published: Jan 1, 2005
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