is this camber measured while crane is in the air? - or while on a floor with two supports at say 1/3 points along the girder length
did you measure to the floor or with a laser?
if measured to floor, the floor may be depressed in center (common occurrence)
from a serviceability perspective...
-We have not see a chipping occurrence in the 200,000 plus feet of this product we have installed.
-the shop & field splices are installed with very tight gaps. larger gaps at rail ends will exacerbate the potential. same for asce.
-bare in mind that bar rails usually have much wider head...
I would trust the manufacturer's recommendations. They go thru a lot of testing & certification effort on their specific product, while codes are more like std practice
The spread sheet has a bunch of hidden columns
you will note the spread jumps from column J to BA
all column in-between are hidden and full of the math the developed the coefficients
we have reworked this sheet A lot... to the point where it now has cap channels on the beams
We put them in intentionally at times...
in the web of beams - on center of gravity - to assist with finding center of section - and leave it it unfilled... assists with finding center 6 or so times during its history it's.
as far as filling holes that are errors, it depends on the quality of...
There are a range of hardness's of the poly wheels available
consider one of the harder materials?
also suggest speak to the poly wheel company sales engineers - they may have thoughts on this
1) I see some suggestions ref tying columns back to CMU wall.. we will NOT do this.. These tie backs experience dynamic & reversing loads... will cause cracks in CMU.
2) Someone mentioned 4 kip lateral load - This is way high for common 5 ton crane... assuming 1000# hoist....
11,000 (hoist &...
Thank you ChipB... there are many things on this site I do not know & come here to learn about... Cranes & their runway systems; I know quite well
Yes Old runner, asce rail is lbs/yard
Corrosive conditions cause me to spec either continuous welds
or
polyurethane caulk After first coat of protective coating, and prior to second coat
we are design-build, so this is often presented as an option to owner... its like an insurance policy - pay me no or pay me a lot more later
if...
I'm seeing a lot of misunderstanding here
1- ASCE rails are NOT S shapes = S beams apply to underhung cranes, Asce applies to top running cranes
2 - Rail size is to be determined by the Crane manufacturer - in no way should an engineer be doing it that does have intimate knowledge of...
I know these quote well
but Not willing to go into this in this forum
suggestion
1 - refer to previous projects the firm has done that use box girders. extrapolate from them
2 - if they do not exist, refer to CMAA for designed criteria
3 - if your firm has not done these before, I would seek...
