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Hi, everyone. I am designing a silo footing, say 18 ft x 18 ft, and 2 foot thick. There is a 58 foot tall silo on my footing. Forces acting on my footing include the dead and live loads of the silo. I have wind and seismic loads on my silo, too, resulting in base shear and overturning moments...

Thank you so much for all the responses, everyone. I must clarify, and I am sorry I did not, that I am doing a preliminary sizing for a footing supporting one or two columns of a pre-engineered metal building, for instance. It is not for a huge mat foundation, or anything like that. Anyway, I...

Thank you so much for all the responses, everyone. I must clarify, and I am sorry I did not, that I am doing a preliminary sizing for a footing supporting one or two columns of a pre-engineered metal building, for instance. It is not for a huge mat foundation, or anything like that. Anyway, I...

I need to size some footings for preliminary estimate purpose? What is the best way to go about this. I have seen some engineers use the tributary area to come up with a approximate footing size. Uplift due to seismic, wind, etc. was estimated at 30 #/SF and the dead load was estimated at 10...

I need to size some footings for preliminary estimate purpose? What is the best way to go about this. I have seen some engineers use the tributary area to come up with a approximate footing size. Uplift due to seismic, wind, etc. was estimated at 30 #/SF and the dead load was estimated at 10...

Oh, I managed to get the link up after a while. I will investigate the website more, but which is the best way to go about getting the software? Can I run it off the website, or can I download it to my local drive to run? Thanks. kk88818 "When I can help, I do; When I need help, I ask...

Thanks for the prompt response, WillsV. Could you please check the link you provided again? I tried it, but am not able to bring it to screen. Appreciate any help from any others who might have information on this. kk88818 "When I can help, I do; When I need help, I ask; Sharing helps...

Could someone point me a source for USGS information on SDS, SD1, etc. for a particular location? I believe that USGS used to have hazmaps where you can provide a location by its coordinates, and you can get this information. That website was recently disabled, if I am not mistaken. However...

Thanks SteveGregory, Setting up a spreadsheet and then inputting the node and member numbers for the respective DJ1 and DJ2 is a good idea, and I sure would give it a go. It is still a form of "manual inputting" although it is done with a spreadsheet that is then imported into STAAD, and can...

Hi everyone, I have got a question of defining DJ1 and DJ2 in STAAD? As you might know, DJ1 (start node) and DJ2 (end node) are used in conjunction with the deflection (DFF) command in calculating beam deflection. Beams in STAAD are very often made up of multiple members, and DJ1 and DJ2 are...

Thanks, spats, StructuralEIt and everyone else for your support and understanding. I am just getting a head start and a reference from this forum and work from there. JKStruct, you hit the head on the nail! I was exactly looking for a rule of thumb, and wanted confirmation that it was As req...

Thanks for all the responses, guys. StructuralEIT, could you please provide a reference for the formula you provided? spats, your comments are noted and a thorough understanding of the formulas and how they are derived will be done before being put to use. Your commens here have provided a...

Could someone please provide me a quick, if preliminary, formula for finding the area of steel required for a foundation, for instance, if I have the factored moment, effective depth and width. Please also provide the reference for the formula. My fc' is 4000 psi. I am thinking that As =...

I need to resolve a question about the use of load combination and/or load factors in the design of a reinforced concrete footing. Say I need to design both the size of a footing, as well as the design the steel reinforcement, both simple and regular enough. Now, sizing of the footing is done...

I have a question about the use of load combination and/or load factors in the design of, say, a reinforced concrete footing. I will need to size an adequate footing, as well as to design the steel reinforcement. Now, sizing of the footing is done using service loads, while the reinforcement...

Hey SteveGregory, thanks again for your prompt response. Per your suggestion, I tried saving my model right after running the STAAD analysis, but that did not seem to do the trick. STAAD did not replace my preliminary sizes with the Steel Design that it deemed were adequate. Do you have any...

Thanks for the prompt response, SteveGregory. Yeah, a second PERFORM ANALYSIS after the SELECT ALL will enable the new sizes to be analysed with a new stiffness matrix. How do I assign the new selected sizes to my model, though, if that is possible, so that I have a brand new model with the...

Is it possible to assign the Steel Design Values to my Members in the Modeling Mode. Let me elaborate. When I first start modeling my structure, I obviously do not know what member sizes are required, and it is not important to know in most cases. I assign a member size that I think is...

Thanks for the quick response, csd72. Hmm, never thought that the 300 pounds located 18 inches from the extreme outer face of the column in each direction at the top of the column shaft is for iron workers hanging off the columns, but it does make sense. Now, this 300 pound load at 1.5 foot...