American Society of Civil Engineers


Analytical and Experimental Investigation of Bridge Girder Shear Distribution Factors


by Brad Cross, P.E., S.E., M.ASCE, (Prof., Dept. of Civ. Engrg., Southern Illinois Univ. – Edwardsville, Edwardsville, IL 62026-1800), Brent Vaughn, P.E., M.ASCE, (Lab. Specialist and Lect., Dept. of Civ. Engrg., Southern Illinois Univ. – Edwardsville, Edwardsville, IL 62026-1800), Nader Panahshahi, M.ASCE, (Prof., Dept. of Civ. Engrg., Southern ILlinois Univ. – Edwardsville, Edwardsville, IL 62026-1800), David Petermeier, P.E., S.E., M.ASCE, (Assoc., Modjeski and Masters, Edwardsville, IL 62026), Yuen Shuenn Siow, P.E., S.E., M.ASCE, (Struct. Engr., Modjeski and Masters, Edwardsville, IL 62026), and Thomas Domagalski, P.E., S.E., (Struct. Engr., Bureau of Bridge Design, Illinois Dept. of Transp., Springfield, IL 62764)

Journal of Bridge Engineering, Vol. 14, No. 3, May/June 2009, pp. 154-163, (doi:  http://dx.doi.org/10.1061/(ASCE)1084-0702(2009)14:3(154))

     Access full text
     Purchase Subscription
     Permissions for Reuse  

Document type: Journal Paper
Abstract: Tests on twelve bridges (six along Interstate 55 and six along Interstate 70/270 in Illinois) were performed to determine the validity of certain provisions for calculating bearing forces in the load and resistance factor design (LRFD) and the load factor design bridge specifications. The bridges were selected to be typical of Illinois interstate highway bridges and maintain a range of parameters to study. These bridges were instrumented on their beam webs with three strain gauge rosettes installed on each beam to measure shear stresses caused by loads. Static tests and slow moving 8 km/h (5 mi/h) tests with a loaded truck in specified locations were performed. Dynamic tests at highway speeds were also completed. Finite-element models were developed and compared to the test results. The study shows that the LRFD specification procedures closely approximate the shear distribution factors determined by finite-element analysis and testing.


ASCE Subject Headings:
Finite element method
Girder bridges
Instrumentation
Load and resistance factor design
Shear distribution