Generation of IMPACT FACTOR of Bridge Standard Loading

[shakildor]

Hi friends,
I am working on generating a standard bridge loading for our country. I have established standard design vehicles by analysing the traffic axel load data of our country. Now I want to establish a relation for computing IMPACT FACTOR on bridges.

So, can anybody help me by suggesting me the method of calculating IMPACT FACTOR.....?

 

[StephenA]

Have you tried the Bridge Engineering forum?

Stephen A

 

[Qshake]

The governing bridge code (AASHTO) here in the USA uses the following formula -

I = 50/(L+125) where L is equal to the span length under investigation. I is limited to 0.3.

For regions of the span where there is continuity over the supports, the L is the average of the adjacent spans.

This has served us well over the years since the code's inception.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

 

[ghghghgh]

Just to be clear shakildor, Qshake noted a percentage of LL, not a factor. The factor would be limited to 1.3 ...... I would hate for your code to specifiy a .3 Impact Factor.