I talked with my initial boss and he said he would have to talk to his boss who is busy today. I showed my boss the same things that I have here just in the AISC text and he sees what I am seeing, and it seems like something doesn't add up right or we are missing something key to using the...
So if I am thinking about this correctly though, then Ru=Pu=Pr which would yield and equation as follows for dead and live loads...
Ru=Pu=1.2*D+1.6*L <= Rn=5.5*Fy*t^2*(1+.25*N/D)*[1-.3*(Pr/(Ag*Fc)+Mr/(S*Fc)]
?
but if I am using LRFD for example doesn't that put the anaylsis by LRFD load combinations on both sides of the equation since I want Ru<=Rn*(resistance factor) and
Rn=5.5*Fy*t^2*(1+0.25*N/D)*Qf
Qf=1-.3*U*(1+U)
U=Pr/(Ag*Fc)+Mr/(S*Fc)
Or am I overlooking something?
So if I have to assume a...
So how do you calculated Pr and Mr? So is required axial strength what I want the structure to hold or what a section of selected pipe can hold? Same with required flexural strength?
I went through the text to where each part was referenced and Pr= Pnt+B2*Plt but how would you get B2 and Plt...
I want to know if anyone has information on some of the variables in this equation. I am unsure what they are exactly. The equation is
U=Pr/(Ag*Fc)+Mr/(S*Fc)
where
Pr= required axial strength in chord
Mr= required flexural strength in chord
Fc= Available stress
S= chord elastic section...
Ok so following the AISC manual I calculated the following values in the attachment... They seem far to high for this structure can anyone verify the numbers I got and maybe explain the process to me a little. I am very new to doing an analysis on hollow round...
Well I am mainly trying to look at the welds between the pipe sections, but have not found a way to do that for a case where a round hss is welded to another round hss.
Is there another equation to look at wall plastification and punching shear besides
plastification...
Well the thing is, it is already in place and since it is so old there isn't documentation on the davit. So to be conservative we assumed since it is a chemical plant and they use a lot of pipe it was made out of pipe. I agree though round hss would be much better.
In response to the first...
I am trying to analyze a davit constructed with pipe sections. To do this I have been using a couple things, Design Guide 24: Hollow Structural Section Connections, along with AISC 13th Edition Manual. The problem I am having is that in the examples of y connection analysis the forces are given...
