Is anyone aware of requirements in ASCE 7 to increase the wind load due to closely spaced vertical vessels (towers, stacks) of similar shape and height? I know other codes (international and some mechanical) do have a factor based on the C/C distance of the vessels but haven't found anything in...
I like the idea of flipping the beam over after it develops the bow... could be a lot of work but its an option. I read something in NDS the other day that said for unseasoned timber, you should multiply the initial deflection by 2X to account for creep. If that's the case, I have nothing to...
The fundamental period of the structure can be calculated for wind loads using the commentary in ASCE 7-05 (Section C6.5.8). I had the same question before and found this article published in Structuremag that cleared up a lot of questions. Hope that helps...
So I thought about this a little more last night and came to the following conclusion: The initial deflection of the beam will be about 3/8" after I set everything but since I am installing the knee braces, that will help reduce the span for the long term deflection... So at most, the deflection...
Yeah, I did the member design for wet use conditions since it will be exposed to the elements outside. As for the knee braces, I plan on keeping them but didn't consider them to reduce my span since I was just using them for lateral stability. But you are certainly correct in saying that they...
Here is the elevation of the pergola. Note that the beam to post connection will be different from what is shown in the sketch. http://files.engineering.com/getfile.aspx?folder=6752f492-2a3d-4a55-843e-44ba48386cca&file=Pergola_Elevation.pdf
Hi All,
I have a quick question for individuals experienced in timber design. I work as a structural engineer but most of the structures I design are steel so I'm not great with timber. Here is my scenario: I am building a pergola in my back yard with a pretty large span so I'm a little...
Greetings,
I'm designing an extruded header and have a question about the required replacement area, here goes...
I have a header with tubes coming into it straight and additional tubes coming in at a 45° angle. The ones coming in at 45° are stagerred from the tubes that come in straight. The...
Im doing a spectrum analysis on a structure that is highly irregular so it is very difficult to get the 90% mass participation that the code requires. I was going to use the missing mass correction command to boost the mass participation. Does anyone know what exactly this function does? I tried...
