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I did make the assumption the camber was "up".....

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...

We have shipped up to 140' ft long - In the US

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

Mcmaster Carr may have this information

Why would you think its NOT supposed to be welded this way?

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...

1) CMAA 74 does not cover monorails - only single girder cranes. However, it may be worth a look, particularly for flange loading 2) By the looks of the system, it may have been designed & installed at time of original building design. If so, the original construction documents would help 3) Are...

we very commonly slot beams - overhead crane runways where beams need to be aligned properly We drill two holes & torch cut the bridge. Slots either way depending on requirements & edge distance I disagree with SBIsteel. Thermal cutting is accepted practice. but it need to be done in a...

1) Insure you have ALL data on cranes being installed. Tandem Lifts? If so distance apart? Wheel loads? hoist weight? Wheel spacing? Proper Impact factors? Class of service & duty cycle Motion speeds Rail size end stop force? (Crane speed affect this) and longitudinal restraint is controlled...

If I understand your description correctly. (which is hard with out a sketch).. You are correct that top of concrete will not be level, therefore having intermittent joints make sense. Dependent on the crane capacity and or wall configuration, I would also consider placing the asce rail...

I believe you are referring to "galvanic reaction" I encourage you look up a "galvanic scale" that presents these two materials. My long ago recollection is that they are fairly close on the scale and hence not very reactive I also note that this is a roof top installation and hence usually dry...