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Editorial Issue 18(1-2)

Editorial Issue 18(1-2) Bridge Structures, Vol. 18, No. 1&2, March & June 2022Editorial Issue 18(1-2)Accidental damage to prestressed concrete bridge girders may occur due to impact by over-height vehicles on the bottom of the girder, or the top flange of the girder may be damaged during deck removal and replacement operations. Since stress checks at service loads are an important component of design for prestressed concrete beams, serviceability-based stress checks should be considered when assessing the structural condition of damaged girders. In “Stress change calculations in accidentally damaged prestressed bridge girders”, Tabatabai and Nabizadeh present step-by-step theoretical calculations to develop equations for estimating service load stress changes due to physical damage (partial loss of concrete section and strands) based on a differential approach. The effects of lack of symmetry in the damaged cross section is considered in the calculations. The authors develop a spreadsheet-based program to calculate complex section property values for the damaged sections. The accuracy of the developed equations was verified using a finite element model of a prestressed beam under undamaged and damaged conditions. Several studies on the live load distribution factor (LLDF) for moment and shear in Northeast extreme tee (NEXT) precast prestressed concrete beam bridges have been http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

Editorial Issue 18(1-2)

Mahmoud, Khaled M.
Bridge Structures , Volume 18 (1-2): 1 – Sep 28, 2022
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Publisher
IOS Press
Copyright
Copyright © 2022 © 2022 – IOS Press. All rights reserved
ISSN
1573-2487
eISSN
1744-8999
DOI
10.3233/brs-220199
Publisher site
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Abstract

Bridge Structures, Vol. 18, No. 1&2, March & June 2022Editorial Issue 18(1-2)Accidental damage to prestressed concrete bridge girders may occur due to impact by over-height vehicles on the bottom of the girder, or the top flange of the girder may be damaged during deck removal and replacement operations. Since stress checks at service loads are an important component of design for prestressed concrete beams, serviceability-based stress checks should be considered when assessing the structural condition of damaged girders. In “Stress change calculations in accidentally damaged prestressed bridge girders”, Tabatabai and Nabizadeh present step-by-step theoretical calculations to develop equations for estimating service load stress changes due to physical damage (partial loss of concrete section and strands) based on a differential approach. The effects of lack of symmetry in the damaged cross section is considered in the calculations. The authors develop a spreadsheet-based program to calculate complex section property values for the damaged sections. The accuracy of the developed equations was verified using a finite element model of a prestressed beam under undamaged and damaged conditions. Several studies on the live load distribution factor (LLDF) for moment and shear in Northeast extreme tee (NEXT) precast prestressed concrete beam bridges have been

Journal

Bridge Structures – IOS Press

Published: Sep 28, 2022

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