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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...

Very helpful, thank you

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...

alt0, do you mean SDPWS?

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

Very clear. Thank you

ok got it. One more question. For collector diagram we use shear wall load and diaphragm load (plf). I use story shear for my shear wall line loads but you're saying I should use Fx level force for shear wall load? Thanks

I agree, Fx is lower then design Fpx but the story shear is higher than Fpx at the 2nd level. It's a 2 story house. Fx is the level force but I'm talking about story shear

My Fpx design value is lower than story shear. Should I scale the story shear down to Fpx design value? Thanks

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...

also, some thicknesses are not found in the IBC table for some reason. That's something I wanna understand too. Thank you so much for your great answers!

So if it's 24/0 it means it's only for the roof? or is it for one story maybe? Thanks

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...

in that case if the plan checker asks me to check the existing footing how can I do that ?

is my calculation useless? does it mean anything? That's actually what my previous boss had told me to do

I didn't ask for the width. I asked for the depth and you don't have to answer if you don't like my question