Angle Support Design for Uniformly Distributed Dead Load
Angle Support Design for Uniformly Distributed Dead Load
(OP)
Hello Everyone,
I need some help with analyzing the strength of the angle leg when the uniformly distributed load is applied in perpendicular to the angle leg. (See the attachment)
As shown in the attached drawing, the angle size is 5"x5"x1/4" thickness with 49 inch length and applied with the uniformly distributed load at 105mm offset from the concrete curb. To check the strength of the angle leg, the thickness (1/4") and length (49") of the angle leg was used to calculate the section modulus, before calculating the moment resistance of angle leg . (Mr=0.9*S*Fy)
And for the Factored Moment, I calculated the point load by multiplying the uniformly distributed load(kN/m) by the angle length (1244mm), and then calculated the factored moment accordingly. (Mf=1.25*w*b*r)
Please let me know if I am on the right track.
I need some help with analyzing the strength of the angle leg when the uniformly distributed load is applied in perpendicular to the angle leg. (See the attachment)
As shown in the attached drawing, the angle size is 5"x5"x1/4" thickness with 49 inch length and applied with the uniformly distributed load at 105mm offset from the concrete curb. To check the strength of the angle leg, the thickness (1/4") and length (49") of the angle leg was used to calculate the section modulus, before calculating the moment resistance of angle leg . (Mr=0.9*S*Fy)
And for the Factored Moment, I calculated the point load by multiplying the uniformly distributed load(kN/m) by the angle length (1244mm), and then calculated the factored moment accordingly. (Mf=1.25*w*b*r)
Please let me know if I am on the right track.






RE: Angle Support Design for Uniformly Distributed Dead Load
For the developed moment, your span would be between the screws (with a overhang from the last screw). As far as capacity goes, AISC has a section for angles. To be on the safe side you may want to take the full length as your unbraced length. (Doubt it would change things though.)
RE: Angle Support Design for Uniformly Distributed Dead Load
1) shear into the supporting fasteners,
2) beam bending of the angle, as a beam on many supports (or simplify to a SS beam between fasteners),
3) flange bending of the loaded flange,
4) bending of the supporting flange ... the out-of-plane reaction from the wall, reacting the offset load.
another day in paradise, or is paradise one day closer ?
RE: Angle Support Design for Uniformly Distributed Dead Load
The rest of the design obviously needs to be fleshed out as rb1957 indicates, but regarding his specific question, he's going down the right path.
RE: Angle Support Design for Uniformly Distributed Dead Load
RE: Angle Support Design for Uniformly Distributed Dead Load
To check the bending in the angle leg, I would consider a 1 foot long piece (if you are using the metric, use a convient unit, meters?) rather than the entire length. I think you are on the right track, but I couldn't follow how the demand is calculated. Also, is S the elastic section modulus or the plastic section modulus (it is eleastic in the US, but I think is is the plastic section modulus elsewhere).
RE: Angle Support Design for Uniformly Distributed Dead Load
[added] Also, usually have the moment arm closer to the support.
[added^2] should have added galvanic corrosion, too.
Dik
RE: Angle Support Design for Uniformly Distributed Dead Load