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I have always seen 30'-0" limit to the spacing of construction joints for exposed walls and 60'-0" limit for unexposed walls. Why is this? Is this referenced somewhere in ACI? Can these limits be increase if you are using the minimum temp. & shrinkage reinforcing? What if you cut every other...

Thank you guys. I appreciate your comments!!

I am curious what most people are using for a floor slab thickness when designing a non composite concrete floor poured over non composite metal deck and bar joists. I'm also curious to hear what most people are using for an on center bar joist spacing? There seems to be an unlimited number of...

I have an above ground tank/hopper/bin (whatever you want to call it) that is to store sand. The rectangular tank will be elevated off the ground on a steel support frame, the walls of the tank will be thin steel plate. The tank is NOT a cylinder or sphere and is not pressurized. The shape is...

Does anyone know of any links/design helps/industry standards on how to design a foundation for a grain bin? The owner wants to basically pour a floading slab with a thickened edge? The bin would be 30 foot in diameter & hold 18,000 bushels @ 60 lbs/bushel = 1080 kips over a 31 diameter...

I have cast in place formed walls that were not properly vibrated to consolidate the concrete. How does this affect the strength? Are there any references or articles that address this? Is there anything that can be done to repair this structurally or would any repair be just cosmetic...

Does heat from a fire damage the structural integrity of sawn lumber, sheathing, and engineered wood (LVL beams, TJI Floor Joists)? I am inspecting a fire damaged building and the wood does not appear to be charred, but some of it is black with soot. I have poked at it and it feels firm. Are...

Thank you!!

Thanks for bringing that to everyones attention. We see horse hair in plaster all the time in buildings built around 1900. I too thought it was common knowledge. Location - Iowa.

Thank you JAE, Dik, CivilPerson and Everyone else! -mdmiller

Thank you everyone for your responses!! The footing cannot be proportion as plain, but if I increase the thickness it could be. Which brings up the question: If a strip footing only has rebar in one direction then it does not meet the "reinforced concrete" requirments and is therefore...

I am designing a footing where Temperature and Shrinkage steel controls. If say #5 @ 12" o.c. is required do I need to provide this steel in both directions or just one? Thanks!!

I have an existing precast double tee floor that according to the shop drawings was only designed for 40 psf LL and 15 psf DL. The owner wants to hang a 1/2 ton hoist and rail to the underside of the precast tees. I expect the point load from the hoist to be around 1.6 kips. How can I...