Transfer 3 stories building wind load to block wall below
Transfer 3 stories building wind load to block wall below
(OP)
I have a 3-story wood framed building on one story parking slab (steel frame). two masonry stairs and elevator walls all way up, 12" thickness below slab, 8" above slab. and a few other isolated walls below slab as my first story shear walls. No steel moment connections and bracing, so I need to transfer all wood building wind shear load to concrete slab, then transfer to steel beams around these walls. I tied slab to walls, and tied beams to wall below with studs, please see sketch. Is this good enough? or any better suggestion?
Thanks
Thanks






RE: Transfer 3 stories building wind load to block wall below
Would a better detail be that the wall is pin connected to the bottom of the beam, and the shear is transfered thru some plates that allow vertical deflection of the beam? Then the block in front of the beam is just cosmetic, it can crack as it likes when the beam deflects. Is there siding or anything on the walls that really would allow you to leave the block out infront of the beam? or get rid of the beam and use the masonry as load bearing?
Also never seen a #9 in a wall, not sure thats the best.
RE: Transfer 3 stories building wind load to block wall below
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Transfer 3 stories building wind load to block wall below
to woodman88, the simpson holddown detail to connect wood to slab is not shown here.
RE: Transfer 3 stories building wind load to block wall below
Mightn’t you be better off in those two sections, to eliminate the steel beams and run your metal deck and slab right out onto the conc. blk. walls? Put a continuous angle with studs on it, at 45° to the legs, in the bond beam at the deck bearing elev. and weld the deck to it. This transfers both vert. and lateral loads more efficiently to the conc. blk. walls; and eliminates the differential deflection at the steel beams, and the difficult intermittent slotted shear connections. Also, your bent #4's @ 32" o/c are of dubious transfer value because they both span a void or a slip joint at the pour stops. I also agree that the #9's @ 32" o/c vert. are a pretty large bar in a typical grouted CMU wall section. Two smaller bars in the same core, or one every 16" would be better, although a bit more placement work. Then your first steel beam is far enough away from the CMU wall so its deflection is less of a problem where so much load transfer is taking place, right at the walls.
RE: Transfer 3 stories building wind load to block wall below
RE: Transfer 3 stories building wind load to block wall below
RE: Transfer 3 stories building wind load to block wall below
Builder said they don't want wall bearing since they like to build wall independently from the building.
For the second detail, I dont think beam will deflect if beam is on top of the wall (will blocks at the beam crack? maybe not). Is that saying it's better to keep beam on top of wall rather to keep off the wall?
RE: Transfer 3 stories building wind load to block wall below
RE: Transfer 3 stories building wind load to block wall below
How tall is the wall?
What is the length of the columns?
Can you post a plan of the area?
RE: Transfer 3 stories building wind load to block wall below
ztengguy, I do see many cases (like the gyms) roof spandrel beams are on top of masonry shear walls to transfer horizontal load and support the roof.
RE: Transfer 3 stories building wind load to block wall below
Why the heavy reinforcing on a 13' wall? what is controlling?
RE: Transfer 3 stories building wind load to block wall below
these stair masonry walls hold shear from top 3 stories of building.
RE: Transfer 3 stories building wind load to block wall below
RE: Transfer 3 stories building wind load to block wall below