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they are structural drawings made in Canada. They are fairly old. 1980's.

I have the structural drawings for a two way slab and the rebars are called out as 10MB, 10MP, 10MC, 15MT... Any ideas what these letters represent?

second pichttp://files.engineering.com/getfile.aspx?folder=df1db6db-62be-4949-a5af-a8bd66a6446d&file=DSC02699.JPG

here is another couple pictureshttp://files.engineering.com/getfile.aspx?folder=2df3d5d4-4137-467b-8a53-c4065d50f1d3&file=DSC02707.JPG

I am almost positive this is not scrap lumber. I have many pictures with similiar damage throughout the building. All look similiar to this. Ive considered carpenter ants but the wood looks so smooth and doesnt have many holes in it like all my reference carpenter ant damage photos.

Does anyone have any ideas what kind of insect could have done this damage? The building is in Ontario east of Toronto.

What code should be followed for designing pedestrian/trail bridges in Ontario/Canada

@bimr: The link you gave quoted the ACI 350.01-01 Clause 2.3.5. I have the ACI 350.1-06 and could not find the wording from this clause anywhere do you know what the new clause in the 06 version is? @waterpipe: thanks for your response, as a note Im new and I didnt think that my first post...

Thanks bimr, Would you be able to provide me a link to this specification and also does the AWWA allowable leaked rate of 0.1 include concrete absorption? Shouldn't concrete absorption vary for different concrete mixes and other factors?

I have a concrete tank that needs a leak test done. The leak test will be done after its already been backfilled and the tank is 21m by 21m and holds about 3000m3 of water. Wall thickness ranges from 600mm at the bottom to 450mm at the top (7.1m tall). My question is once the tank is filled up...

I have a concrete tank that needs a leak test done. The leak test will be done after its already been backfilled and the tank is 21m by 21m and holds about 3000m3 of water. Wall thickness ranges from 600mm at the bottom to 450mm at the top (7.1m tall). My question is once the tank is filled...

I have a stacked stone gravity retaining wall with 10 degree sloped backfill. What height of backfill do I use to calculate the soil pressure on the wall? http://files.engineering.com/getfile.aspx?folder=cf6384ec-7517-45e9-b130-21f0dfc455ed&file=20110324135231.pdf

I have a stacked block gravity retaining wall with a 10 degree backfill slope. When I am calculating the pressure on the wall from the soil what height of backfill do I use? http://files.engineering.com/getfile.aspx?folder=a82a355d-6fd6-45bf-b103-6a682faa3f36&file=20110324135231.pdf