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22 January 2013

Bridge Deck Analysis By Finite Difference Method

By : Unknown
On : 18:23


A detailed analysis done by Gautam Chattopadhyay
Names and Symbols used:
Ardeck – area of the deck.
wdeck – width of deck.
span – span length of bridge.
izlong – Moment of inertia of each longitudinal girder about z axis (transverse axis)
iztrans – Moment of inertia of entire deck in transverse direction about longitudinal axis.
flexkl – Flexural rigidity in longitudinal direction.
flexkt – Flexural rigidity in transverse direction.
ngird – number of longitudinal girders.
tslong – Tosional rigidity in longitudinal direction.
tstrans – Torsional rigidity in transverse direction.
econc – modulus of elasticity of concrete.
gconc – shear modulus for concrete.
N (ndiv) – Number of divisions in either direction.
Bridge decks are normally comprised of a grillage system of longitudinal and transverse girders. Longitudinal girders are supported at two ends while the extreme edges in transverse direction remain free. Bridge decks need special methods of analysis when subjected to unsymmetrical loadings. Unsymmetrical loading occurs for the following reasons:
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Bridge Deck Analysis By Finite Difference Method