Title:
Probabilistic Models for Resistance of Concrete Bridge Girders
Author(s):
Andrzej S. Nowak, Ahmed S. Yamani, and Sami W. Tabsh
Publication:
Structural Journal
Volume:
91
Issue:
3
Appears on pages(s):
269-276
Keywords:
beams (supports); bridges (structures); girders; moments; prestressed concrete; reinforced concrete; shear properties; Structural Research
DOI:
10.14359/4354
Date:
5/1/1994
Abstract:
Resistance (load-carrying capacity) parameters are important in the development of the new generation of probability-based LRFD (load and resistance factor design) codes. Bending and shear resistances are considered for concrete bridge girders. Two structural types are considered: reinforced concrete T-beams and prestressed concrete AASHTO-type girders. Bending capacity is calculated using well-established models for flexural behavior of reinforced concrete and prestressed concrete beams. Shear capacity is modeled using the modified compression field theory. Material properties, dimensions, and accuracy of the analytical model are tested as random variables. Statistical parameters are determined on the basis of the available test data by simulations. The calculations are performed for selected sections and spans. The simulation results serve as a basis provided to determine the bias factors and coefficients of variation of resistance. The resulting statistical parameters of resistance are summarized in tables.