roof diaphram
roof diaphram
(OP)
With a CMU exterior and bar joist 7' centers, steel decking (1.5b22)and NO perimeter angle to tie roof diaphram to walls - CAN THE CONTRACTOR EVEN GET AWAY WITH THIS?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: roof diaphram
If you are the engineer and know what is needed for this particular situation, draw it up and issue an RCOP pronto so that he can do the work to get the diaphragm distrubute the shear to the walls properly.
As designers, we have enough problems when contractors don't build to the plans, try to do it "the way we've always done it", etc. I don't think we should be complaining when they build it to the plans but the plans are wrong. We should own up to our omissions, fix the plans, and be done with it.
RE: roof diaphram
I do not expect the contractor to second guess then engineer, but he should issue RFI (same as RCOP?) before continuing.
Who pays for the correction is a different topic all together.
RE: roof diaphram
From franklewis3's posts here and in Thread507-33808, it does not appear that the contractor feels there is a problem. He is not "knowingly omit(ting) something that he feels should be present."
He is a contractor, not an engineer, and it sounds as if he does not have the knowledge to recognise this as an incomplete-and dangerous- installation. If he did recognise it as such, he would submit an RFI- he does not want a building that he is putting up to collapse any more than anyone else does.
If franklewis3 recognises the danger, he must be proactive. Depending on his role in the project, he must correct the design (if EOR or AOR), direct the EOR to correct the design (if Owner), or inform the owner of the situation and have the owner direct the engineer to correct the design (if franklewis3 is a third party).
Just telling the contractor he his wrong and getting mad about it without correcting the drawings/design will accomplish nothing. The contractor obviously needs direction and needs documentation of the change, to protect himself legally and financially.
RE: roof diaphram
sorry for the confusion. My whoa was for your comment "if it is not in the plans the contractor shouldn't build it". Yes, contractor is not obligated to provide something that is not in the drawings. But if it is something obvious that is missing, he shold alert the engineer.
i think we are along the same wavelength.
regards.
RE: roof diaphram
RE: roof diaphram
It continues that the Contractor is not responsible to pay to correct this error if he notifies the Engineer. I guess I don't understand why the contractor wouldn't ask the question. He could get paid at Change Order rates to fix it if it is an error by the engineer. If it's not, he covered himself by asking.
RE: roof diaphram
Seismic zones, it is definite requirement. But for wind only zones, similar detailing provisions should apply for windward and leeward force applied to the horizontal projection of the building.
RE: roof diaphram
RE: roof diaphram
Getting back to the original post, there are several ways to get the shear in the edge of a roof deck diaphragm down into the resisting element besides using a continuous angle. The deck can be wrapped down over the joist ends using bent light gauge and attached to the block (You probably want a continuous bond beam in the wall just below this), or if the loads are light enough perhaps the rollover resistance of the owj connection cited in one of the posts will be enough.
From a practical perspective, attaching joists to block without a bearing plate or other embed can be difficult to have done properly, imho. So if the angle is not requested on the con docs, a different load path needs to be considered. Is it too late for that? Is everything up?
Regards.
RE: roof diaphram