Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Editorial

Editorial Bridge Structures, Vol. 3, No. 2, June 2007, 91 This issue of Bridge Structures leads off with a paper by Yarnold et al. on ‘‘Local buckling analysis of trapezoidal rib orthotropic bridge deck systems’’. The paper studies the behavior of local buckling in trapezoidal rib orthotropic bridge deck systems. Parametric analyses were performed using the finite element method to compare local buckling of the rib walls (webs) and deck plate by varying the corresponding width-to-thickness ratios. The results demonstrate a reduction in the capacity of the deck system at which local buckling is initiated in the rib walls due to the existence of negative bending moment near the floorbeams in addition to the global axial forces. Filled grid decks offer a lightweight and high strength deck alternative to reinforced concrete decks. Better understanding of grid deck behavior accompanied with optimized manufacturing process and improved design can avoid poor details and provide optimum grid deck performance. In ‘‘Strength behavior of filled steel grid decks for bridges’’, Huang et al. present the results of three fullscale experimental tests on filled grid decks to quantify their structural behavior. The authors conducted parametric studies to quantify the effect of variations in the significant design parameters. In ‘‘Evaluation of creep effects on the time-dependent deflections and stresses in prestressed concrete bridges’’, Hedjazi et al. investigate time-dependent deflections, stresses and internal forces in prestressed concrete boxgirder bridges due to the creep of concrete. The authors utilize ABAQUS software to develop three-dimensional finite-element models, which include the effects of the load history, material nonlinearity, creep and aging of concrete, for the analysis of balanced-cantilever segmental bridges. The three-dimensional shell elements are used for modeling box-girder walls, while rebar elements are used for modeling prestressing tendons. The step-by-step procedure allows simulating construction stages, effects of timedependent deformations of materials and changes in the bridges’ structural system. Several fascia beams of an existing prestressed concrete box-girder bridge, located in the City of Defiance, Ohio, USA, were severely deteriorated due to the influence of deicing salt applied during wintertime. An in-depth visual inspection and subsequent full-scale load tests were conducted to identify the extent of deterioration. A strengthening strategy was devised involving advanced carbon fiber reinforced polymer (CFRP) composite strips, post-tensioned via the StressHead System that was developed and patented in Switzerland. In ‘‘Preservation of Hopkins Street Bridge via externally bonded prestressed CFRP laminates’’, Zoghi and Foster present the application of this technique, which is sponsored by the US Federal Highway Administration (FHWA) through the Innovative Bridge Research and Construction (IBRC) Program. The IBRC Program promotes the use of new materials and construction techniques for the repair, rehabilitation, replacement, or new construction of bridges and other structures. Khaled M. Mahmoud, PhD, PE Editor-in-Chief Bridge Technology Consulting New York, New York Bridge Structures ISSN 1573-2487 print/ISSN 1744-8999 online ª 2007 Taylor & Francis http://www.tandf.co.uk/journals DOI: 10.1080/15732480701520030 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

Editorial

Mahmoud, Khaled M.
Bridge Structures , Volume 3 (2) – Jan 1, 2007
Download PDF
1 page

Loading next page...
 
/lp/ios-press/editorial-Py8xXXeJG3
Publisher
IOS Press
Copyright
Copyright © 2007 by IOS Press, Inc
ISSN
1573-2487
eISSN
1744-8999
DOI
10.1080/15732480701520030
Publisher site
See Article on Publisher Site

Abstract

Bridge Structures, Vol. 3, No. 2, June 2007, 91 This issue of Bridge Structures leads off with a paper by Yarnold et al. on ‘‘Local buckling analysis of trapezoidal rib orthotropic bridge deck systems’’. The paper studies the behavior of local buckling in trapezoidal rib orthotropic bridge deck systems. Parametric analyses were performed using the finite element method to compare local buckling of the rib walls (webs) and deck plate by varying the corresponding width-to-thickness ratios. The results demonstrate a reduction in the capacity of the deck system at which local buckling is initiated in the rib walls due to the existence of negative bending moment near the floorbeams in addition to the global axial forces. Filled grid decks offer a lightweight and high strength deck alternative to reinforced concrete decks. Better understanding of grid deck behavior accompanied with optimized manufacturing process and improved design can avoid poor details and provide optimum grid deck performance. In ‘‘Strength behavior of filled steel grid decks for bridges’’, Huang et al. present the results of three fullscale experimental tests on filled grid decks to quantify their structural behavior. The authors conducted parametric studies to quantify the effect of variations in the significant design parameters. In ‘‘Evaluation of creep effects on the time-dependent deflections and stresses in prestressed concrete bridges’’, Hedjazi et al. investigate time-dependent deflections, stresses and internal forces in prestressed concrete boxgirder bridges due to the creep of concrete. The authors utilize ABAQUS software to develop three-dimensional finite-element models, which include the effects of the load history, material nonlinearity, creep and aging of concrete, for the analysis of balanced-cantilever segmental bridges. The three-dimensional shell elements are used for modeling box-girder walls, while rebar elements are used for modeling prestressing tendons. The step-by-step procedure allows simulating construction stages, effects of timedependent deformations of materials and changes in the bridges’ structural system. Several fascia beams of an existing prestressed concrete box-girder bridge, located in the City of Defiance, Ohio, USA, were severely deteriorated due to the influence of deicing salt applied during wintertime. An in-depth visual inspection and subsequent full-scale load tests were conducted to identify the extent of deterioration. A strengthening strategy was devised involving advanced carbon fiber reinforced polymer (CFRP) composite strips, post-tensioned via the StressHead System that was developed and patented in Switzerland. In ‘‘Preservation of Hopkins Street Bridge via externally bonded prestressed CFRP laminates’’, Zoghi and Foster present the application of this technique, which is sponsored by the US Federal Highway Administration (FHWA) through the Innovative Bridge Research and Construction (IBRC) Program. The IBRC Program promotes the use of new materials and construction techniques for the repair, rehabilitation, replacement, or new construction of bridges and other structures. Khaled M. Mahmoud, PhD, PE Editor-in-Chief Bridge Technology Consulting New York, New York Bridge Structures ISSN 1573-2487 print/ISSN 1744-8999 online ª 2007 Taylor & Francis http://www.tandf.co.uk/journals DOI: 10.1080/15732480701520030

Journal

Bridge Structures – IOS Press

Published: Jan 1, 2007

There are no references for this article.