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Thanks a lot; this has definitely made things a lot clearer. I have been using the wL^2/8 /d to back check my work for these simple load conditions.

Maybe I'm just stirring the pot, but joist are typically welded to a steel beam or wall plate cast in a wall. I understand that we should assume a typical weld as a pinned support. But joist are welded on both ends, which does not come accroos as a pin-roller condition. Can anybody share some...

I am just using it for checking old open web steel joist. So both bottom and top chords are parallel and have been modelled as continous members along the joist. Panels are at 610 mm apart. In the end if I model with both ends as pinned restraints or as a Pin-Roller system I get different...

I am modelling an OWSJ on RISA with just a typical uniform load of 900 lbs/ft. The joist is 12'-0 long all with 24" panels. I have made the end pieces fixed and every other node on the program unrestrained. After analyzing the and checking the chords I notice that the axial force in the top...

Checking the design of a fellow engineer. So then by using this radius of gyration to find lamda, I inserted it into the Cr = 0.9AFy(1+?^(2n))^(-1/n) to find the compressive resistance of the web member in compression. I think this is the right procedure, Please correct me if I am wrong. If...

I am designing some 18" OWSJ, for the KL/r the steel handbook says r is the radius of gyration. I have tried using it for round bar and my web comes out extremely big, but if using the actual radius of the bar the web of these joist come out reasonably sized. I am wondering which one is the...