What ap/Rp would you use for a suspended catwalk with lateral bracing?
What ap/Rp would you use for a suspended catwalk with lateral bracing?
(OP)
The catwalk is suspended from a steel structure with tube hangers with lateral bracing at about 7'-6" above the catwalk elevation.
Catwalk will have C6x stringers at 5'-0" o.c. with 1/4" diamond steel plate and L2x2 @ 30"o.c.
Code = ASCE 7-05.
Previous engineer used a ratio of 1/2.5.. I am thinking this is more of a flexible component with high deformability and use 2.5 / 3.5.
I believe the fundamental period of the braced structure needs to be less than 0.07 seconds to be considered "rigid" and I don't think this layout would be rigid, therefore and ap value of 1.0 may not be appropriate.
I would prefer tho to use the lower coefficient and let this element be very flexible as deflection isn't really an issue. So I am torn...
Catwalk will have C6x stringers at 5'-0" o.c. with 1/4" diamond steel plate and L2x2 @ 30"o.c.
Code = ASCE 7-05.
Previous engineer used a ratio of 1/2.5.. I am thinking this is more of a flexible component with high deformability and use 2.5 / 3.5.
I believe the fundamental period of the braced structure needs to be less than 0.07 seconds to be considered "rigid" and I don't think this layout would be rigid, therefore and ap value of 1.0 may not be appropriate.
I would prefer tho to use the lower coefficient and let this element be very flexible as deflection isn't really an issue. So I am torn...






RE: What ap/Rp would you use for a suspended catwalk with lateral bracing?
RE: What ap/Rp would you use for a suspended catwalk with lateral bracing?
RE: What ap/Rp would you use for a suspended catwalk with lateral bracing?
I don't know what your loads are. But assume Fp=2Wp, Wp=100 plf and brace spacing at 40', the horizontal force is only 8 kips. That is less than 12 kips axial load into the HSS 4x4 brace.
RE: What ap/Rp would you use for a suspended catwalk with lateral bracing?
RE: What ap/Rp would you use for a suspended catwalk with lateral bracing?