Example calc of Differential Temperature on bridge deck
Example calc of Differential Temperature on bridge deck
(OP)
Hi
I am looking at analysing a simple support beam, released axially at one end, under differential thermal loads from AS5100. The beam is for a pedestrian bridge, it is a composite 1200WB249 with a 200 slab spanning 28m.
I can derive the temperature, but i am looking for a sample calc to show how to take the temperature load and how to convert these into design actions i can then add to other loads such as dead / live etc.
Can anyone provide any advice?
Thanks
Blihp
I am looking at analysing a simple support beam, released axially at one end, under differential thermal loads from AS5100. The beam is for a pedestrian bridge, it is a composite 1200WB249 with a 200 slab spanning 28m.
I can derive the temperature, but i am looking for a sample calc to show how to take the temperature load and how to convert these into design actions i can then add to other loads such as dead / live etc.
Can anyone provide any advice?
Thanks
Blihp





RE: Example calc of Differential Temperature on bridge deck
RE: Example calc of Differential Temperature on bridge deck
There could be some stresses induced if the temperature profile has any discontinuities in it or does not reach full depth.
blihpandgeorge
If you are design a bridge like this, you should have a good text book on it. Read it.
RE: Example calc of Differential Temperature on bridge deck
how do account for the longitudinal stress on shear studs by the induced curvature?
RE: Example calc of Differential Temperature on bridge deck
thanks
RE: Example calc of Differential Temperature on bridge deck
Again, for a shallow steel bridge I don't see any point in a thermal analysis; even the current AASHTO specs leave wiggle room. However, from the paper I posted that's how it's done Down Under.
RE: Example calc of Differential Temperature on bridge deck
The procedure in outline is:
1. Calculate the stresses that would be induced if the section was rigidly restrained against longitudinal strain.
2. Calculate the force and moment that would be induced by these stresses.
3. Calculate the stresses on the composite section due to application of the negative restrained force and moment (which restores longitudinal equilibrium after removal of the imaginary rigid restraint).
4. Add 1 and 3.
Hambley's "Brick Deck Behaviour" has a chapter on it.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Example calc of Differential Temperature on bridge deck
Link
Cheers
Phil