I am designing a simple gable roofed building using ASCE7-10 envelope procedure (Figure 28.4-1 low-rise building). In the design of the MWFRS the negative pressure on the windward side of the roof was greater than the suction on the leeward. Since the net pressure on the roof was in the...
I am trying to figure out why if you used the envelope procedure in ASCE7-10 on a gable roof your windward roof will always have a negative pressure (suction) but if you use the directional procedure the windward roof can have either positive or negative pressure on the windward roof.
I'm...
I have a question about diaphragm load transfer that I am hoping someone can help me with. I am working on a wood framed building that has a gable roof coming in perpendicular to another gable roof (see sketch). I don't have any lateral resisting system in the portion of the building that is...
I have a 50'x 200' gabled building where the roof purlins are running parallel to the perimeter shear wall below in the 200' direction. The purlins span between glulam beams spaced at roughly 20' o.c.. The contractor wants to place the purlins on top of the glulam beam in which case...
I am looking for some other opinions/information on how grain pressure along a perimeter wall, such as a flat storage building, should be calculated. In the past I have used Rankine's equation for active earth pressure with a backslope in determining the equivalent fluid density. If I were to...
I am a structural engineer working on a precast mill building and I am trying to better understand the information being provided to me by a explosion venting supplier. My questions is what do you do when the total volume of the building exceeds the 10,000 cubic meter size limitation of NFPA 68...
Is there a certain distance out from a building that grade elevation must be maintained to make sure a foundation is at frost depth. I ask this because I had designed a perimeter stem wall and footing for a building with the bottom of footing placed at frost depth, but I have found out that...
I am trying to find some resources that discuss how to calculatate the at-rest lateral earth pressure coeffient when you have a sloped backfill. I have searched past threads and have only seen people's opinions without any resources (I would like to be able to point to something published in my...
When checking a support beam over a rail unloading pit for deflection should I be including the impact factor? I can't find anything in AREMA or the IBC.
Thanks you for any help.
I need some help with a reviewer comment that I received on a 5/16" weld along the length of a 3/8" thick angle. The comment is "verify that the 5/16" fillet weld will fit considering the toe fillet radius at the end of the 3/8" thick angle".
I have never heard of this being problem and have...
In the past I have found this forum extremely helpful as I have researched questions but this is the first time that I am posting my own question. The question pertains to an existing tunnel that will now be seeing additional load due to changes on a project(attached is sketch of the tunnel top...
I am wondering in checking a tension only X-Brace with single angles for the slenderness ratio recommended by AISC of L/300, would you use the entire length of the angle or half the length (the X-Brace is bolted at the center)?
I have heard it both ways at the office and would like to get...
I am looking for advice on whether to try an take both modules of the Structural Exam (all 16 hours) in one sitting or do one module at a time. I know no one has experience on taking the full 16 hour exam since this is the first time offered but I would still like to hear opinions.
One of the...
