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I have a cable bundle on a solar farm running thru a CAB support system. I have seen the quarion of 1.2*sqrt(D^2*number of cables in bundle). Can anyone tell me where this equation came from? Also, would it be realistic to use this to determine the diameter of a cable bundle if it is not a...

Any experience with driving steel piles thru coal seems in the ground and corrosion mitigation?

I am leaving a 2’-0”x 6’-0” opening in a foundation for conduit stub ups. These will not be encased in a ductbank, but in individual tubes coming up. How are the openings filled in after conduits are placed? Thank you.

I have been told precast is not an option. This is why i am not use to this situation.

I have designed a small concrete trench. 10” wide walls with height of 1’-6” and 1’-0” clear between walls. Base is 8” thick. Grating will be on top of the trench. Trench length will be around 25’-0”. I am use to having the base poured first, then coming back with the pour for the walls. My...

I am designing an equipment foundation and anchors for a piece of equipment. In Risa 3D, I have located the anchors and drawn a vertical rigid link from center of foundation to top of concrete distance, using a fixed end condition at the node which would be at the center of the foundation...

I am creating a fence post concrete foundation that sits on grade. Fence is chainlink with 6ft height and 10 ft post spacing around a construction site. Fence is permanent, but no excavation is allowed (landfill). I have applied a wind load and a 200 lbs point load at top of post. Questions: 1)...

Thank you all! I have read thru the AISC manual and see there is no real “standard” size. Everyone’s post was very helpful. The fabricator specific angle size makes a lot of sense. I need a very specific connection for a bolt location, so it sounds like i will have to specify the angle size on...

Per AISC, what would be a standard connection angle size for a double angle connection?

It is more about getting the accurate loading to the platform created by the stringers. If the stringers are fixed at the bottom, it appears to give the platform stability that cannot necessarily be counted on. Thank you all for your comments. Pinned top - roller bottom connection looks like...

I am designing a steel platform with 2 C12 stringers coming down to a concrete landing. What end boundary and end conditions should be used for stairs. I have a pinned connection at the top of the stringer and at the bottom, i have reactions in the Y and Z (assuming stringer runs along the Risa...

section D.6.1.3 Appendix D of ACI 318-11 just requires the shear capacity to be multiplied with 0.8 when a grout pad is used.

When checking Hilti anchors in Profis, it is drastically conservative on shear when grout is used. Typically, I use 80% of the strength of the anchors without grout. Is this a common problem?