Unbraced Length of Arch
Unbraced Length of Arch
(OP)
I am doing some preliminary design work for a building with Glu-Lam arches (this is more of a general question which could apply to steel as well). The member would be continuously laterally braced by the roof for buckling about its weak axis. But what would I use for an unbraced length for buckling about its strong axis? I have been unable to find any references with recommendations. Any help would be appreciated.






RE: Unbraced Length of Arch
You need to look up timber arch construction... I'll try to lay my hand on a design procedure.
If you have other specific questions, post again.
Good luck,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Unbraced Length of Arch
So that means if it is fully braced about the weak-axis, I can use the full allowable compressive stress for design (not reduced for column buckling/stability effects, i.e. Cp = 1.0 for NDS design)?
RE: Unbraced Length of Arch
There is an equation for buckling of circular rings under uniform compressive loading. Try Roark's Formulas for Stress and Strain, I believe it's in there. He might even have some information on buckling of arches, but I've not looked for it. For steel members, the buckling of a circular ring is usually not the controlling factor. Bending due to nonsymmetric loading is.
RE: Unbraced Length of Arch
Mike McCann
MMC Engineering
RE: Unbraced Length of Arch
RE: Unbraced Length of Arch