Lateral deflection of beams/girders due to wind
Lateral deflection of beams/girders due to wind
(OP)
Hi all, Is there any way (the formula/any check/limit) to calculate the lateral deflection of bridge girders due to wind only.It will be very helpful if anyone gives me guidelines to calculate the latearl deflection.






RE: Lateral deflection of beams/girders due to wind
RE: Lateral deflection of beams/girders due to wind
RE: Lateral deflection of beams/girders due to wind
RE: Lateral deflection of beams/girders due to wind
200ft,crossframe/diaphragm spacing 25ft and any girder section but no concrete deck so how we can calculate lateral deflection.
RE: Lateral deflection of beams/girders due to wind
RE: Lateral deflection of beams/girders due to wind
Sorry I did not answer the question, I hate it when people throw out answers on here that do not answer my questions.
So...
If you really want to check it I would recommend modeling it in a computer program. Personally I would use RISA 3D, but that is up to you. I believe that you can download a "demo or trial" version if you do not have it. You will not be able to save anything or get any printouts, but you should be able to check it that way.
RE: Lateral deflection of beams/girders due to wind
RE: Lateral deflection of beams/girders due to wind
RE: Lateral deflection of beams/girders due to wind
Composite bridge girders have very slender and small top flanges because once the concrete is set, they do not work that much. Furthermore bracing on bridges is usually provided for the bottom flanges but not for the top flanges because they are restrained by the concrete slab.
This means that during erection the top flanges of steel girders are working very hard and close to their limit, not because the stresses are high but because a flange under compression, long unrestrained span, has a high slenderness ratio.
Lateral wind loads might be enough to cause lateral torsional buckling failure. So although the wind loads themselves will be very small, they might be enough to puss the girders over the edge. The fact that 2134 is asking aboug deflection checks worries me even more. If the deflection is significant, then the girder capacity to support its own weight might be compromised.
Just a wild thought from my ignorance.
RE: Lateral deflection of beams/girders due to wind