Recommendations for More Accurate Shear Rating of Prestressed Concrete Girder Bridges

Research output: Contribution to journalArticle

Abstract

A numerical parametric study was conducted with two primary objectives: (1) to investigate the accuracy of existing AASHTO shear distribution factors for prestressed concrete girder bridges in the United States; and (2) to provide recommendations to more accurately rate bridges for shear and permitting. Results from the parametric study indicated that the longitudinal stiffness (girder composite longitudinal moment of inertia divided by cube of span length) to transverse stiffness (transverse deck strip moment of inertia divided by cube of beam spacing) provided an indication of the elastic shear distribution in nonskewed bridges. Shear distributed more broadly to adjacent girders when the ratio of longitudinal to transverse bending stiffness was lower. The stiffness ratio can be used as a screening tool to delineate cases for which AASHTO shear distribution factors are conservative or unconservative relative to results of detailed finite-element or grillage analyses. Because grillage analyses can account for the distribution of shear associated with truck axle position, they can be used to better determine permit truck demand.

Original languageEnglish (US)
Article number04019117
JournalJournal of Bridge Engineering
Volume24
Issue number12
DOIs
StatePublished - Dec 1 2019

Fingerprint

Prestressed concrete
Stiffness
Trucks
Bending (deformation)
Beams and girders
Axles
Screening
Composite materials

Cite this

@article{3c0b70d1610a4c69ba6103ce02135c18,
title = "Recommendations for More Accurate Shear Rating of Prestressed Concrete Girder Bridges",
abstract = "A numerical parametric study was conducted with two primary objectives: (1) to investigate the accuracy of existing AASHTO shear distribution factors for prestressed concrete girder bridges in the United States; and (2) to provide recommendations to more accurately rate bridges for shear and permitting. Results from the parametric study indicated that the longitudinal stiffness (girder composite longitudinal moment of inertia divided by cube of span length) to transverse stiffness (transverse deck strip moment of inertia divided by cube of beam spacing) provided an indication of the elastic shear distribution in nonskewed bridges. Shear distributed more broadly to adjacent girders when the ratio of longitudinal to transverse bending stiffness was lower. The stiffness ratio can be used as a screening tool to delineate cases for which AASHTO shear distribution factors are conservative or unconservative relative to results of detailed finite-element or grillage analyses. Because grillage analyses can account for the distribution of shear associated with truck axle position, they can be used to better determine permit truck demand.",
author = "Ben Dymond and French, {Catherine E} and Shield, {Carol K}",
year = "2019",
month = "12",
day = "1",
doi = "10.1061/(ASCE)BE.1943-5592.0001495",
language = "English (US)",
volume = "24",
journal = "Journal of Bridge Engineering",
issn = "1084-0702",
publisher = "American Society of Civil Engineers (ASCE)",
number = "12",

}

TY - JOUR

T1 - Recommendations for More Accurate Shear Rating of Prestressed Concrete Girder Bridges

AU - Dymond, Ben

AU - French, Catherine E

AU - Shield, Carol K

PY - 2019/12/1

Y1 - 2019/12/1

N2 - A numerical parametric study was conducted with two primary objectives: (1) to investigate the accuracy of existing AASHTO shear distribution factors for prestressed concrete girder bridges in the United States; and (2) to provide recommendations to more accurately rate bridges for shear and permitting. Results from the parametric study indicated that the longitudinal stiffness (girder composite longitudinal moment of inertia divided by cube of span length) to transverse stiffness (transverse deck strip moment of inertia divided by cube of beam spacing) provided an indication of the elastic shear distribution in nonskewed bridges. Shear distributed more broadly to adjacent girders when the ratio of longitudinal to transverse bending stiffness was lower. The stiffness ratio can be used as a screening tool to delineate cases for which AASHTO shear distribution factors are conservative or unconservative relative to results of detailed finite-element or grillage analyses. Because grillage analyses can account for the distribution of shear associated with truck axle position, they can be used to better determine permit truck demand.

AB - A numerical parametric study was conducted with two primary objectives: (1) to investigate the accuracy of existing AASHTO shear distribution factors for prestressed concrete girder bridges in the United States; and (2) to provide recommendations to more accurately rate bridges for shear and permitting. Results from the parametric study indicated that the longitudinal stiffness (girder composite longitudinal moment of inertia divided by cube of span length) to transverse stiffness (transverse deck strip moment of inertia divided by cube of beam spacing) provided an indication of the elastic shear distribution in nonskewed bridges. Shear distributed more broadly to adjacent girders when the ratio of longitudinal to transverse bending stiffness was lower. The stiffness ratio can be used as a screening tool to delineate cases for which AASHTO shear distribution factors are conservative or unconservative relative to results of detailed finite-element or grillage analyses. Because grillage analyses can account for the distribution of shear associated with truck axle position, they can be used to better determine permit truck demand.

UR - http://www.scopus.com/inward/record.url?scp=85072639324&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072639324&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)BE.1943-5592.0001495

DO - 10.1061/(ASCE)BE.1943-5592.0001495

M3 - Article

AN - SCOPUS:85072639324

VL - 24

JO - Journal of Bridge Engineering

JF - Journal of Bridge Engineering

SN - 1084-0702

IS - 12

M1 - 04019117

ER -