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I've spent a good amount of time searching through the forums and have not found a thread addressing this. For many years I had a great relationship with a PEMB supplier rep. He would give me preliminary column reactions for all my buildings in exchange for having the opportunity to bid on the...

Very Insightful. Thank you very much. Rich

Uniform Slab Thickness post tension slab on ground foundation: At what cable length should I consider changing from a single pull post tension cable to a double end pull post tension cable? At what length should I consider changing from a double pull cable to breaking the slab into multiple...

I have been asked to design a water tower stand in Dimako, Cameroon. I'm hoping there is an African engineer monitoring this website who can assist with information. I have been unable to determine the type of seismic activity of this area. Are there seismic design parameters, such as Ss & S1...

Thanks for the info. I would appreciate any other's input as well that may have designed superflat slabs. Another question, for a super flat slab, is it okay to put a sand cushion base below the slab, or will that cause potential problems for settlement movement in the future? Thanks.

I'm looking for recommendations for minimum longitudinal reinforcement for a super-flat floor. I have a requirement of Fmin=65 and am designing the strips for the floor. I have the strip joints located in the middle of the storage racks. The strips are 200 feet long. What is the...

I have a precast concrete building where the exterior wall will have a large hole cut out of it. The wall is reinforced with WWF. It is 5 inches thick. The wall has an exterior exposure. I have 2 questions: 1. What would be the recommended way of protecting the WWF of the saw cut face from...

Thanks for the questions. I'm doing an addition to the original project. I don't know the EOR for the original project, nor have the ability to contact him. I'm looking for someone to assist me who has experienced with Chinese steel designations and can give me section properties of the steel...

I'm working to add some catwalk platforms to a steel frame power plant. The steel was designed and manufactured in China shipped over. Most of the steel shapes have Chinese designations. I have found some of them, but can't find quite a few. I need section properties for: BH550 BH600 BH680...

Thanks, I found it in the commentary. This project happens to be located in a Seismic Category A location. Wind will most likely control after I calculate it.

I'm looking at the wind loads on a parking garage. It needs to be 50% open for ventilation. I looked at the definition in ASCE 7-10 of a 'Building, Open' (at least 80% open) and 'Building, Partially Enclosed' (total area of opening in a wall that receives positive external pressure exceeds the...

I have a client who really does not want any visible cracks in his floor as he wants a 'show-room' floor. I am considering post tensioning it and want to get some feedback on others who may have done is for slab on ground crack control. The slab area is approximately 95 feet x 75 feet. 3...

That's what I ended up doing. Thanks.

I don't use STAAD or RISA. I use Bentley RAM Elements. I did not see Chinese shapes in my data base.

Thanks for the link. Being from the slide rule era you appreciate a good printout of the document. Unfortunately the PDF is a no-print documents. Thanks anyway.

Unfortunately they are true Chinese shapes. The drawings show a mix of traditional USA wide flanges and Chinese shapes. My new structure will be supported on both so I need to check capacities of each. That is why I need section properties of Chinese shapes. The drawings state the Chinese...

I'm not trying to be critical or sarcastic. I think you are getting too specific in your design. Take it from someone who has done this for 30+ years. You should just give yourself an allowance for carpet, like 3 PSF, and move on. If your design is so influenced by such a minor load then you...

I'm working on to additions to a project in the USA that has steel shapes from China. I see shapes designations like HN500, HN446, HM440. I'm looking for a website that will give me section properties for the Chinese steel. I would like full properties such as A, Ix, Sx, Rx, etc. Any...

Okay, I just noticed my math is off above. Should have had an adjusted value of K=5 PCI. Dumb math error.

Josh, Thanks for your response. I appreciate your insight. So as I understand your response, and I use my specific example, for RISA the recommended value for subgrade modulus for the computer analysis is K=3 PCI in my above illustration. I understand what you said about engineering...