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Inelastic load distribution in multi-girder composite bridges
Highlights ► Composite slab-on-girder bridges were modeled using nonlinear finite element method. ► Fifty cases covering many parameters affecting load redistribution were studied. ► Effects of concrete nonlinearity and steel yielding were included in the FE model. ► Load distribution noticeably varied between the elastic and the ultimate state. ► Load redistribution can be advantageous when evaluating the capacity of existing bridges.
Abstract To accurately assess the ultimate load capacity of concrete slab-steel girder bridges, the effects of concrete nonlinearity and steel yielding on the truck load distribution in simply supported composite bridges are investigated using the nonlinear finite element (FE) method. In this study, fifty cases are analyzed to investigate the effect of the aforementioned parameters as well as the effects of other parameters including longitudinal and transversal truck position, number of loaded lanes (2–4), bridge length (12–20m) and width (8–16m), number of girders (3–6), girder spacing (2–3.75m), and slab thickness (175–275mm). The moment in each girder, based on the nonlinear FE analysis, is used to obtain its Load Distribution Factor (LDF) at different load levels up to failure and is compared with the corresponding elastic LDF according to AASHTO LRFD specifications. The results show from zero to 54% increase in the internal girder LDF (average 32%), and from zero to 29% decrease in the external girder LDF (average 17%) as the bridge traverses from the elastic to the ultimate state. This redistribution can be advantageously used when evaluating the load carrying capacity of existing bridges.
Inelastic load distribution in multi-girder composite bridges
Highlights ► Composite slab-on-girder bridges were modeled using nonlinear finite element method. ► Fifty cases covering many parameters affecting load redistribution were studied. ► Effects of concrete nonlinearity and steel yielding were included in the FE model. ► Load distribution noticeably varied between the elastic and the ultimate state. ► Load redistribution can be advantageous when evaluating the capacity of existing bridges.
Abstract To accurately assess the ultimate load capacity of concrete slab-steel girder bridges, the effects of concrete nonlinearity and steel yielding on the truck load distribution in simply supported composite bridges are investigated using the nonlinear finite element (FE) method. In this study, fifty cases are analyzed to investigate the effect of the aforementioned parameters as well as the effects of other parameters including longitudinal and transversal truck position, number of loaded lanes (2–4), bridge length (12–20m) and width (8–16m), number of girders (3–6), girder spacing (2–3.75m), and slab thickness (175–275mm). The moment in each girder, based on the nonlinear FE analysis, is used to obtain its Load Distribution Factor (LDF) at different load levels up to failure and is compared with the corresponding elastic LDF according to AASHTO LRFD specifications. The results show from zero to 54% increase in the internal girder LDF (average 32%), and from zero to 29% decrease in the external girder LDF (average 17%) as the bridge traverses from the elastic to the ultimate state. This redistribution can be advantageously used when evaluating the load carrying capacity of existing bridges.
Inelastic load distribution in multi-girder composite bridges
Ghani Razaqpur, A. (author) / Shedid, Marwan (author) / Nofal, Mostafa (author)
Engineering Structures ; 44 ; 234-247
2012-05-17
14 pages
Article (Journal)
Electronic Resource
English
Analysis , Bridge , Composite , Concrete , Finite element , Load distribution , Reinforced , Steel
Inelastic load distribution in multi-girder composite bridges
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