สุดาทิพย์ ตั้งวงศ์ไชย. Parametric investigation of slab on girder bridge using 3-D finite-element modeling techniques. Doctoral Degree(Civil Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2011.
Parametric investigation of slab on girder bridge using 3-D finite-element modeling techniques
Abstract:
The purpose of this study is to evaluate the effect of bridge geometries and truck
loading characteristics on the negative and positive moments in concrete deck slab of
composite highway bridges. The suitable finite element modeling (FEM) technique has
been determined by verifying the models against the results based on a full-scale
laboratory experiment performed by other researchers. Further extensive parametric
study has been conducted based on this selective modeling technique. The parameters
used in this study are the variation of girder spacing, truck position (transverse and
longitudinal), number of vehicles on the bridge (multiple presence), and location along
the span (support, quarter and mid span). The effects of boundary conditions and
intermediate diaphragms are also taken into consideration at this time. For each
combination of these parameters, the negative and positive slab moments due to live
load are then evaluated. In addition, the influence of dead load of bridge deck on the
slab moments is also investigated. The results show that the effect of dead load on the
slab moments is insignificant compared with that of live load. From the comparative
study of several design codes, analytical methods and the present study, an
enhancement on assessment of negative and positive slab moments under live load
scenario can be established. As a result, the required reinforcement area in the deck slab
to resist the negative and positive moments can be achieved more realistically. Finally,
empirical formulas have been proposed to readily calculate these negative and positive
slab moments for a rational deck slab design.