Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
(OP)
Wondering if anyone has this book and if they would be willing to share page 65 or the page with catenary . I only want to confirm an equation so am not keen to purchase the whole book, but if people think it is worth it I will try to track down a copy.
Also would anyone have the DASMA Rolling Sheet Door Calculations for wind locks paper?
Also would anyone have the DASMA Rolling Sheet Door Calculations for wind locks paper?
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."






RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
http://books.google.ca/books?ei=QP1oUretMKHL2gW3pY...
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
I was hoping that they hadn't adopted a "sag" centenary shape as the deflected shape of the roller door will not match a "sag" condition. I was hoping that had adopted somehow an equation that better represented the situation.
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
I think you start out with a fairly light stiffness door panel spanning as a simple beam, btwn. the two tracks. Either from a uniform wind loading or from a single projectile, I would treat this as we would a regular simple beam (panel section); bending, deflection, finally some panel buckling, yielding, maybe some plastic hinge starting. At this point you have a deflected shape with Δ several times the thickness of the panel, and we know that regular beam theory no longer really works with these large Δ’s, so switch to a sagging cable analysis with this deflected shape. Using wire rope, catenary shape theory really doesn’t work when the cable is assumed to be a straight line (very taught), the tension forces to hold it there go to infinity. I would treat this as the two step problem above, and I gotta think some more about where to switch or what exactly happens btwn. the two.
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Look in SlideRuleEra’s collection of std. ref. books, etc. I think he has a book or two on wire rope and tension structures, the various formulas, etc.
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Denial,
I disagree a gravity catenary is different to a pressure catenary.
In the gravity catenary case the load is always acting with the vertical axis, hence it is what I would refer to as a sag situation.
In the pressure case the load changes direction as the roller door deflects, here the load will always be perpendicular to the surface.
These should result in different profiles of deflection I would suggest.
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Wikipedia: in physics and geometry, a catenary is the curve that an idealized hanging chain or cable assumes under its own weight when supported only at its ends.
Wolfram's MathWorld: the curve a hanging flexible wire or chain assumes when supported at its ends and acted upon by a uniform gravitational force.
Merriam-Webster on line: the curve assumed by a cord of uniform density and cross section that is perfectly flexible but not capable of being stretched and that hangs freely from two fixed points.
My printed version of the Oxford English dictionary: curve formed by uniform chain hanging freely from two points not in same vertical line.
None of the above includes anything about "pressure".
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Here are some of their articles:
DASMA Door and Access Systems Manufacturers Association
Rolling Door Wind Load Determination - Effective Wind Area
Wind Load Calculations For Rolling Doors .pdf eBooks for Free.
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
BA
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary
I agree that the dead weight of the door changes the statics. I think the solution considering door weight and wind combined would be iterative because the shape of the deflection curve governs the direction of the applied pressure.
BA
RE: Handbook of Engineering Mathematics, American Society of Metals (ASM) (Page 65) catenary