Replacing Bridge (under Canadian Code - CAN-CSA S6-06)

[ghcaste]

Hello,

I have to replace a 50 year-old bridge. Only the superstructure will be replace (not abutments). Since this is a new bridge I have to use the current code (CAN-CSA S6-06; this is in Ontario, Canada) which requires the bridge to be designed for a CL-625-ONT, which is over three times higher than the load original used for the old bridge. I most likely have the risk that the abutments will not take the new load. Does anyone one if there is any provision that allows for design a new bridge based on the fact that the abutments do not need replacement an therefore they will call for the critical bridge load?

 

[dik]

Can you use Part 11 of the Ontario Building Code? or is it excluded for bridges?

Dik

 

[chicopee]

With new steel, you'll have new bearing pads that may allow to spread of the loads on the existing abutments, otherwise, abutments may have to be beefed up(which I have not seen done in 15 years of bridge construction in Ct.) or replaced which I have seen done when replacing old bridges.

 

[ghcaste]

Thank you guys, under clause 3.8.3.1 of CSA S6-06, I am allowed to lower the load based on traffic conditions. I will design using the old load given that the traffic will not change (this is certified by tyhe owner of the bridge); so I am still good with the abutments.