I have a feeling it is rather complicated. It has eccentricity and wall gets some restrain from top and bottom. The load is taken partially by rim joist and partially by bottom plate, or composite action of the wall. It is combination of everything. Usually the load in residential is small...
The rim joist is fine if it takes all the load. But the 6" wall's center of gravity is off from the rim joist. It is not that straight forward for me to see the load go to rim joist instead.
It is hard to understand some common details on residential construction. Here is one. Most roofs are built with roof trusses, which can have long span like over 20 or even 30 feet. The bearing wall take quite a big load. But when the floor joist underneath is parallel to the bearing wall...
Thank you everyone for all the inputs. BAretired, my joist actually is 29' span plus 1' cantilever. At end of cantilever there is one 10' nonbearing wall, which added some additional load to the joist. Since it is cantilever, it helps the joist, but it does add load to the double plate. The...
You mean lining up the joist is standard practice for framing contractor? If that is the case, we do not need to worry about the double top plate for gravity load at all! From your experience, does the framing contractor always follow the standard practice?
Thanks DaveAtkins. I do not see split on the top plate but the contract did use long nail when he nail the OSB to the top plates. This wall is also a shearwall so it has 1/2" OSB on one side. How do you calculate how much load can the OSB take? When I use uniform load (plf) to check the...
It is two story residential and the floor joists are at the second floor. I do have tile at bathroom and the bathroom is at the end of the joist so deflection is not that big there.
I agree no live load reduction for residential since the area is not big enough. IBC limits live load reduction...
Forgot to attached the copy from LPI56 catalog. Here it is.
I am still trying to understand COEngineering's "If it is not lining up, as long as it is 3" away then it should not create any moment. ". Can anybody help out?
Thank you everyone for your...
Thanks bigmig. Would you take a look at the attached copy from LPI56 catalog? It indicates for DL=15psf, LL=40psf and live load deflection controlled under L/480 the span can be 29'-11" (@ 12" o.c.). I always used the catalog to choose the joist and never used software. Is that something I...
I was using 14" I joist (LPI56). It is such long span since I was trying to reduce concrete work in the crawspace. The joist itself works. I think the vibration is not a problem since the deflection was controlled at l/480 and there is blocking between the joist, which I think would help the...
Thanks hokie66. It does give me more confidence on my understanding. BTW, is 29' floor span commonly used in residential? There are nonbearing walls below and cross the long floor joist at middle of the span. The inteior nonbearing wall is built on existing 2x6 T&G plank floor. Will it be a...
It took me a while to agree with sdz. I used to think the plate on top will carry all the load until it fails, then the load will be carried by the one at bottom. But the more I think of it, the more I agree with sdz. Once the top plate carry the load and deform, the bottom plate will deform...
It is an interior bearing wall with joists only on one side. But it does not have rim joist. There is blocking between the floor joist, which I do not think it would help to distribute any load. I could prove it works for bending by using reduced live load ( normally I don't use this for...
I have a very long span floor (29')for a residential house. The floor joists are supported by existing 2x4 stud wall. The studs are spaced at 16" oc (HF #2). By using DL=15psf, LL=40psf, my analysis shows the single 2x4 top plate can not carry the load. I do not think it is right to consider...
