Hi Everyone,
I am designing a trapezoidal shape house and I wanna know how to get the reaction on the inclined shear wall. If I assume earthquake hits from either x or y direction then it's easy to find the reaction on that shear wall using the angle. But what if the earthquake direction is in...
Hello everyone,
I am designing a deck with knee braces. It's designed as a separate structure so there is a gap between the existing house and the deck. Because of this gap knee brace has to be connected to the blocking between deck joists, not to a beam. Please see my sketch to visualize this...
Hi everyone,
I have a remodeling project and it's under construction now. The builders cut the existing truss bottom chord to place a 21' span beam where the wall used to be. The inspector wants approval for this.
The beam was designed for ceiling loads since the architectural plans didn't...
Hi everyone,
My client is adding a deck to an existing 2 story house ( See the sketch attached). The city requires that we check existing house for additional load per IEBC section 1103.2. My plan is to do a seismic analysis of the existing building alone and then with the deck. After that we...
Hi everyone,
I have a deck addition project and it's gonna be attached to an existing 2 story house. The plan checker is asking to check existing house for additional seismic load from deck. It says, "please justify (E) lateral force resisting system of house subject to additional lateral load...
Hi everyone,
For shear walls that are short I know that we have to reduce capacity by 2b/h for seismic design. But, what if wind governs? I couldn't find any requirement for reduction for this case. Can you please help me find references?
Thank you
Hi,
I have a question about collector design. I use ENERCALC to generate seismic base shear and force distribution, story shears. But ENERCALC has 2 level and story forces: Fx and Fpx. Should I use Fpx, diaphragm force to design collector elements? I think if I use it the collector diagram...
Hello Everyone.
I'm trying to understand what span rating is for a plywood but I don't get the right hand number. For example, if we have 24/0 or let's say, 32/16 I understand the left hand number means the span between joists across the long direction of the plywood but what is the right hand...
Hello all,
For 2 stage analysis, if we have a wood framed upper structure above a concrete podium I know that I have to treat the upper and lower parts as separate buildings. But do I add (R upper)/(R lower)x V upper to its base shear? In equation form I mean this: V lower = (R upper / R...
Hello everyone,
I have a hillside project that consists of wood framing over steel cantilever column system.
My question is this: can I use R=1.25 for the bottom part and R=6.5 for the upper part? should I do 2 stage analysis or use one of the R values for both levels?
Please see my sketch for...
Hi Everyone.
I am trying to design a cantilever beam sistered to main beam. My question is how should I set up the supports? fixed, pin at every bolt, or pins at locations where it sits on a wall and the last bolt location?
Please see my sketch attached. Sorry if it's messy. I can make another...
I have a small irregular shape building and need to design the shear walls. Can the highlighted shear line be one line or should I treat these two areas (1 and 2) as different diaphragms.
In my opinion it can be one line with two different tributary areas (one diaphragm). Please see attached...
Hi everyone.
My project consists of adding a second floor to existing 1 story building. I was asked to check if existing footing can support 2nd floor addition loads. I wanna know if my calculations are correct. Please see attached and let me know your thoughts. Thank you so much in...
I wanna know what types of connection types are there between wood beams and steel beams. I know one of the ways is to use a nailer with nelson studs on top of the steel beam with blocking and hang the wood joist/beam. Are there other methods? Thank you
I'm designing a detached covered patio with steel ordinary moment frame and CMU shear wall. The rafters are supported by a steel beam on one side and a CMU wall on the other side (see diagram).
So my question is what R value should I use to design the CMU wall and the steel frame? Thank you so...
