Hey BB have you seen a rebar “X” lke this before?
I don’t usually pay attention to the cores unless I have sleeves to put in.
I also noticed how much PT cables are going in—– I haven’t seen that many cables in a below ground parking garage before.
If you don’t stand behind the troops, why don’t you try standing in front of them. Bumper sticker
Engineered materials and vacuum-press laminations prevent warping and keep a tall, flush-panel door from being excessively heavy.
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Replies
Are those pictures of a site in Bellevue? Skansa job perhaps?
Anywho, the x bracing is most likely due to seismic bracing. Especially considering the location.
Leland
Oh sure you had to mention Skanska, last January I finished Lincoln Square condo/hotel ( Skanska job) spent 22 months on that one.
These pics are Harborview Medical Center 16 story additiopn to the Center. The pics were taken from the mechanical tunnel from my 10 story addition.
Turner Construction is the general on this one.
Skanska has a big project going in on N E 8th right by I405.If you don't stand behind the troops, why don't you try standing in front of them. Bumper sticker
Shear panel.
SamT
Praise the Corporation, for the Corporations' highest concern is the well being of the public.
Is it common?
I do alot of "center core construction" jobs don't think I ever noticed an "X" like that before, but like I said earlier I usually have a bunch more things to worry about when the core walls are going up.If you don't stand behind the troops, why don't you try standing in front of them. Bumper sticker
Is it common?Wasn't, but, IMO they will be.I'm surprised they didn't hook or Ell the ends.SamT
Praise the Corporation, for the Corporations' highest concern is the well being of the public.
I've designed like that before. Like for Duane's Spheramid, the main footings ran diagonally corner to corner with 2 #8 70's hooked rebar to resist the spreading forces of the whole structure hanging from four splayed legs.The perimeter footings just had 4 ea #4 60's. Coulda got by with 2, but I like symmetry.SamT
Praise the Corporation, for the Corporations' highest concern is the well being of the public.
AH HA!!! A public admission by an engineering type that they make their designs more expensive and more work just cuz they like the way it looks... ""The perimeter footings just had 4 ea #4 60's. Coulda got by with 2, but I like symmetry."" Never thought I would see it. ;-)
"Poor is not the person who has too little, but the person who craves more."...Seneca
bitter is not the person whos accepts what he is given, but the person who must find fault.
SamT, Good reply.
"Poor is not the person who has too little, but the person who craves more."...Seneca
Plumbbill, that is a considerable amount of rebar for a core. But considering that Harborview is the regional trauma center (level I) for Washington, Alaska, Idaho, and Montana, the new construction most likely is reinforced to handle high seismic events.
Have you done any work at Valley Medical Center in Renton?
Leland
Oh yeah it's alot of rebar, before the forms get put on you can barely see daylight through them.
Did you see the other pic with all the PT cables?
Haven't done any work on that hospital, but my oldest boy's pediatrician was there.If you don't stand behind the troops, why don't you try standing in front of them. Bumper sticker
Earthquake resistance.
Walls in earthquakes are exposed to, among other things, racking forces. Rebar placed vertically and horizontally does not resist racking forces.
Concrete is weak in tension. When a wall racks to one side a line of tension is created from one top corner to the opposite bottom corner, at approximately a 45° angle. If a wall is racked to that side repeatedly or strongly enough, a diagonal crack opens up. In an earthquake the wall will rack both ways, producing X-shaped cracks. Putting in diagonal rebar resists the racking forces.
Here's a photo of a seismic retrofit. The building was not originally designed to resist racking, so this was added to the building exterior.
View Image