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I have a client that wants to place rigid insulation around the walls and base of a buried digester reinforced concrete tank. There are 20 tanks side by side with each tank measuring 50'x 200' with 20' of sludge. The client does not want to place the tank on piles, so the tank will bear on the...

There are no embedded bulb tees. The panel widths are 12".

I am working on an existing building that is 60+ years in age. I need to check the capacity of 2" gypsum roof plank. Does anyone have any information about gypsum plank, or any idea of a name of an existing manufacturer I may call to inquire about the load capacity of the plank?

My client wants to relocate an existing 2-ton Beacon Line Jib crane manufactured by Cleveland Beacon Products. The client has none of the original information from the crane vendor regarding. The vendor no longer makes the crane. I have contacted them for information as to design forces to be...

Thank you. I also found out SJI is very helpful with information for old joist.

I am trying to find load tables for an old joist. I need to check the joists to ensure they are structurally adequate for a new roof top unit. The tags state they are macomber-canton joists. I found an old Structural Engineering Topics Thread dated 2003. It appears some members have tables...

I have concluded that you are correct. I instead multiplied my live loads by 1.8. Since ASD uses an approximate 1.67 factor for yield, 1.8*1.67=3.0. This satisfies the 3.0 safety factor requirement. Anyone have comments on this approach?

I am load rating 2 previously constructed lifting beams. I have found that ASME B30.20 requires a 3.0 safety factor against yielding. Does OSHA require a more stringent safety factor? I have found on the internet that Ontanio OSHA requires a 5.0 safety factor against failure. Furthermore...

Thank you all for your comments. From the responses, I will have to find a way to brace the mezzanine with angle iron. paul

Thank you for your answer: I realize it is not typical to use bar grating as a diaphragm. The reason I would like to use it as a diaphragm is because using rods or angle iron is not easily done in this case due to the equipment being supported. The equipment are cooling towers, which...

I am designing a large industrial mezzanine in state of LA. I would like to weld my bar grating to the structural steel, so it may be used as a diaphragm to transfer my forces to my bracing system. I do not know how to quantify the diaphragm capacity of the grating. I called the McNichols...

Does anyone know what the shear modulus of elasticity of masonry would be, or where i can find that information? Thanks, PAT2

It ended up being a program limitation. I needed to break the members up to create enough degrees of freedom for the program to work. Thank all for their help. Paul

shepherd and 3dboy, Thank you for responding. I am attempting to run a modal analysis. I have tried to change around the member releases numerous times to see where the porblem lies with my assumptions. I believe the brace should have the moment released at the top of columns and at the...

I am attempting to model a chevron brace in Visual Analysis, but the program is giving me an error message stating "The model has fewer than 25 degrees of freedom (DOF), modal analysis cannot be performed. You can split members or plates to get enough DOF for a modal analysis." Brace...

I am investigating a foundation of two large turbine generators. The concrete is about 40 years old, and it has been heated to 400 to 700 degrees Fahrenheit for most of its life. Spalling and cracking of the concrete in some areas has made the client concerned about the concrete strength. The...

Does anyone know of a good ACI reference for the design of post tesioned concrete - slabs in particularly? Preferable written for the 02 code? Thank you.

The STAAD Version is 2001.

Please help! I am designing a concrete framed building. The foot print is approximatley 54' x52'. The building is one story, has a concrete framing system with masonry-in-walls and a poured concrete roof. I modeled the roof using 1'x1' plates. The beams are made of 1' sections, and the...