I have a question regarding a simply supported beam overhanging one support. There is a vertical load and load in the plane of the page at the end of the beam. The support nearest the overhang is actually a brace. See the figure I attached. My question is regarding the modelling of the...
I am involved in the design of a 5" total depth concrete slab on 1 1/2" metal decking. I am designing the slab on deck and someone else is desiging the steel framing. My questions are regarding the lateral load resistance of the floor. The floor is being designed for 10% of the DL of the...
I have a situation where the owner of a home wants to remove the basement posts supporting the beams. The beams run along the center of the basement. the house is approx 3000 sq ft. there are 2 beams which are 8" deep (didn't get the exact size yet) that span from the top of the foundation to...
I'm analyzing a channel supporting a uniform load. i've assumed a C8x11.5 spanning 11.5'. the channel supports a metal deck. the channel is the end support and the span to the adjacent beam is 4'. I'm designing the channel as a simply supported member in flexure. The channel will be...
I have a situation where I currently have a gusset plate welded to both the top (for vertical component of brace force) and bottom (for the horizontal component of shear force). The brace is at such a steep angle that the weld (length of the plate) in the vertical direction is about 16". This...
I have a question as I'm reading through the ASD 9 Steel manual. When/why would you use a slip critical connection in a framed beam connection as opposed to a bearing simple shear connection? I'm assuming the only applicable case would be high seismic regions. Do you typically specify short...
When designing steel floor framing, I'm looking on input on how others resolve floor framing lateral loads. for example, the wind load are uniform across the building, but are assumed to act at the joints. Do you design the diaphragm (metal decking, concrete on metal decking, or whatever it...
I have some questions about gusset plate connections in general. They may pertain to vertical bracing or truss connections. I'm attaching a gusset plate to the web of a column and underside of a beam (the beam frames into the web of the column). The brace force is about 22 kips (from STAAD...
I'm not completely familiar with the gage values in the AISC manual. What is the purpose of gage. Could a different bolt spacing be used for connections that deviate from the gage values. what would be the effects of this?
When calculating the seismic accelerations per ASCE 7, the g value I should be multiplying my dead weight by are the values calculated from equations 11.4-3 and 4, right? I just want to make sure I'm understanding correctly. There are some sections in chapter 11 after this regarding importance...
Hey,
I've been trying to find the green and blue AISC green and blue LRFD VOL. 2 Connections book. I can't seem to find it. Does anyone know where I can get a copy of this book?
Thanks
I just had a question about how people model cross bracing (vertically and horizontally). Do you use just two members? Is the connection between the cross braces released of moments? I was going through the STAAD examples and they use two members and I didn't see any releases at the joint...
I haven't had much experience in earth retention, underpinning, and micorpiles. I was in a meeting yesterday and there was a lot of talk about these issues. Does anyone know of a good book that talks about these topics and concepts? I'm not very familiar with this type of stuff and would like...
Question about angle design per AISC 9:
5.1.1 talks about tip of the angle in compression. Does this mean the the vertical leg points up? or can that also mean the leg in compression is laying flat and the vertical leg in tension. In this case the tip of the angle leg is also in compression...
How do I calculate the moment of inertia of a rotated section? On wikipedia (don't have my text book with me) There is a big equation :
Ix* = (Ix+Iy)/2 + (Ix-Iy)/2*cos(2*theta) - Ixy*sin(2*theta)
What is the Ixy and how do I calculate it?
theta is the angle of rotation, correct?
THanks
I've been reading up on chapter 6 (Wind loads) of ASCE 7 and have some questions. What is the difference between "fastest mile per hour wind" and "3 second gust wind"? Which one is larger? which one do you design for? I'm having trouble gauging wind speeds and what they mean in real life...
I took a dynamics of structures course a while back and have forgotten some of the concepts. I have a question about damping values. Maybe someone can explain it in simple terms. Does a higher number mean that there is less "damping" and the structure is more free to sway or more "damping"...
I'm looking at a connection where I have a #14 screw fastening two pieces of sheet metal siding together. Both siding sections have stiffeners. They will be acting compositely spanning about 6'. My concern is leeward wind suction acting at the exterior siding. How would I calculate the...
I have some more questions about trusses and decided to start another thread because the one I started the other day is a little off topic. I have attached a scan of some questions I have on a truss I am analyzing. I got these shop drawings and have to verify everything works.
From what I...
