Simplified Moment Redistribution of Hybrid HPS 485W Bridge Girders in Negative Bending
Publication: Journal of Bridge Engineering
Volume 12, Issue 4
Abstract
Simplified moment redistribution procedures based on shakedown have recently been approved by AASHTO LRFD Bridge Design Specifications (AASHTO 2004). These procedures are currently only applicable for homogeneous girders, and thus, the objective of this study is to evaluate whether these procedures can be further applied for hybrid HPS 485W girders. A parametric study is carried out using validated three-dimensional finite-element (FE) analyses to study the inelastic behavior of hybrid HPS 485W girders in negative bending for this purpose. The effective plastic moments obtained from the FE studies are compared with those from the proposed prediction equations, where good correlation is observed. A design example of a three-span slab-on-girder bridge with hybrid HPS 485W girders using both elastic design and the simplified moment redistribution procedures is also presented, where it is shown that the use of moment redistribution procedures results in a negative bending section that is 13% lighter than the corresponding elastic design.
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Published In
Journal of Bridge Engineering
Volume 12 • Issue 4 • July 2007
Pages: 456 - 466
Copyright
© 2007 ASCE.
History
Received: Apr 15, 2005
Accepted: Nov 7, 2005
Published online: Jul 1, 2007
Published in print: Jul 2007
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