Wood Shear Wall Design Example - Part 1 of 3

[@harshitsrivastava9513]

love from india

[@chris88888]

This is literally helping me out so much at work. Kestava… you are the MVP!!!

[@Kestava_Engineering]

thanks Chris!

[@SouthBayEngr]

Mr. Kestava - love your videos. Can you do a video on designing a special moment frame for a soft-story retrofit? Those are pretty popular here in California. Thanks!

[@Kestava_Engineering]

those are all over the place in Cali! never done one personally but have done work similar to them.

[@jimwhite4686]

Thank you for the video! Very helpful

[@Kestava_Engineering]

You're welcome!

[@707Gforce]

Thanks for the video! I'm struggling with timber design at the moment, this was super helpful--not a lot of content like this out there. Subscribed!

[@nesllinmaedineros4410]

Love this video Can I request shearwall with both seismic and wind in the future

[@Kestava_Engineering]

yes!

[@johnstearns4166]

Hi I watched the video last year and it helped me understand the role of the shear wall in our home remodel project. (Although I got a engineer

[@johnstearns4166]

Oops. I have a degree in civil engineering but only worked in that field for a year. I'm retired now but with the video I understand what's needed in shear wall design and we were able to finally get our building permit. An 8-foot shear wall was required for us to add an 8-foot door to an existing 27-foot wall. The builder framed what looks like a vanilla shear wall design with hold downs on either end and 3 anchor bolts in between. However, the inspector won't let us proceed with the sheathing until a specialist conducts a "pull test." Can you please tell me how a pull test is conducted? Dies this seem like overkill for a wood frame residence? BTW I live in California. Appreciate any light you can shed on this. Thanks, John

[@Kestava_Engineering]

Hi John, my following comment is for educational purposes only as I am not licensed in CA. I would think an alternate route to avoid the pull test would be to get a registered engineer to sign off on the shear wall. The engineer could run calculations proving the design (as built) is adequate and stamp that and submit to the local jurisdiction for review. CA you have more to consider as a professional engineer because of high seismic forces, even for residential projects.

[@johnstearns4166]

@@Kestava_Engineering thanks for getting back to me. Although I like your rationale, here's what's actually happening. A registered engineer did the design and the calculations. These were submitted to another registered engineer who okayed the permit. The hold-downs and anchor bolts were installed as specified. Nonetheless, the inspector rejected it because for some reason it has to be okayed by a specialist. They do not take the builder's word that the epoxy was correctly applied and are requiring a pull test. I have no idea how they would applythe force if they yanked it out, but I would be really upset if they managed to yank it out of the concrete foundation. I really appreciate your advice. On a different topic, I'm wondering if your video series would be of use to civil engineering schools that teach basic theory but hold off on the nitty gritty until grad school.

[@Kestava_Engineering]

@@johnstearns4166 sounds like they required a special inspector to come out and perform either "continuous inspection" or "period inspection" of the holddown installation. There are requirements per chapter 17 of the IBC and may be addition requirements for your local jurisdiction. This is something the contractor unfortunately should have been aware of. Hopefully one day our structural engineering schooling changes. I think it could be so much better and produce the next level of engineer. some of our teaching methods are pretty old!

[@johnstearns4166]

This is what I found in Chapter 17. Not sure if it makes a case for an exemption. Thanks for your ideas. 1705.11.1 Structural Wood Continuous special inspection is required during field gluing operations of elements of the main windforce-resisting system. Periodic special inspection is required for nailing, bolting, anchoring and other fastening of elements of the main windforce-resisting system, including wood shear walls, wood diaphragms, drag struts, braces and hold-downs. Exception: Special inspections are not required for wood shear walls, shear panels and diaphragms, including nailing, bolting, anchoring and other fastening to other elements of the main windforce-resisting system, where the [BSC, HCD-1, HCD-2, SFM] lateral resistance is provided by the structural sheathing and the specified fastener spacing at panel edges is more than 4 inches (102 mm) on center.

[@jvcastillo7646]

I can’t wait to finally understand this, I know I have a long way to go but I’m taking mapping and surveying next semester, any tips ? Thanks for the video boss

[@Kestava_Engineering]

JV thanks for the kind words my man! Surveying takes a bit of practice to get good at. The idea is simple enough but repetition is what is needed most for surveying. I got pretty good at it in my early career but now Im a hack haha.

[@perfectbasics238]

Nice video bro..Can you please upload video on how to transfer shear for out of plane offset shear wall??

[@susana_gv]

Hello! Thank u so much for the videos. I have a question, can a use this same procesure to calculate a wood structural panel? ( no shear wall)

[@haimai4937]

Thank you for your video. But i dont understand what is ASD and LRFD . Can you explain it to me?

[@jacobdolas3876]

Hey I love your videos! Sidenote: what’s that pdf mark-up software that you’re using called? Is it free??

[@AKAlex66]

I just did the SE Building back to back.

[@Kestava_Engineering]

your a BEAST. firm handshakes all around. how did it go??

[@AKAlex66]

@@Kestava_Engineering It's all about time management and nerve control. I did it in Las Vegas because California canceled the exam in Pomona and that was extra stress.

[@Kestava_Engineering]

@@AKAlex66 damn great work. I cant believe they couldnt get there ducks in a row to let people take the exam. people are 6ft apart normally hahah. But i guess safety should be the number one priority. great job pivoting.

[@Jeff29E6]

When exactly do you know when you have a "Shear Wall"? I.e. I know in NDS 2015 SDPWS Table 4.2.4 defines the Maximum Diaphragm Aspect Ratios, where it is the Maximum Length to Width Ratio, but is every exterior wall considered a shear wall? I'm struggling to understand when a shear wall is needed and when one is not?

[@Kestava_Engineering]

Jeffery, Great question - if you are designing a new structure you get to designate what is and is not a shear wall. you can tell if a wall is not a shear wall due to its lack of hold downs or structural panels. Another great indicator is if a wall does not have a strip footing below it, this normally also indicates that the wall is not a shear wall. I need to make a video talking about aspect ratios! Keep up the great comments Jeff!

[@Kestava_Engineering]

anyone find the struggle with technology I was having??

[@user-vo3ku2sf2d]

How would you do this for a 2 story house? Would you just treat each floor as its own problem and just add the weight of the 2nd floor onto the first floor?

[@Kestava_Engineering]

For 2 stories you have to make sure you properly transfer shear forces through nailing at the break in sheathing between the floors. Also you need to make sure you provide strapping in line with your hold downs at the base to transfer tension loads due to overturning. other than that, there is not to much of a difference. I think ill get a video done soon to show you!

[@nesllinmaedineros4410]

@@Kestava_Engineering yes please 🙏

[@zachthatcher3079]

@@Kestava_Engineering Following up on this! Did you ever make a video on this? If so where could I find it?

[@jeffsupran3729]

what building components are used to get Fe. Roof and 1/2 all walls in both directions?

[@Kestava_Engineering]

for lighter construction (like wood) you can conservatively take 1/2 the walls in both directions) but technically if you want to sharpen the pencil you only need to account for the out of plane walls mass depending on the direction you are checking. and then you can include in plane mass when analyzing the shear walls and bypass the diaphragm. This becomes more critical when designing a building like a tilt where a TON of the mass is from the walls themselves.

[@jeffsupran3729]

@@Kestava_Engineering Thanks also I noticed you did not use wall weiigt and roof weight in reducing overturning, is this correct. Also is it OK to use shear loads in tables from UBC Chapter 23 for wood?

[@ruizhang4390]

Love your video. Suggest you get a better microphone.

[@Kestava_Engineering]

Thanks for the feedback Rui, Im messing around with a new office layout and headset, let me know if the quality improves. Thanks for being a big part of this team

[@AmanSingh-us5wr]

Did you just use F*** word at 12:48 timeline?

[@Kestava_Engineering]

ya caught me