replace flitch beam with steel I beam
replace flitch beam with steel I beam
(OP)
what size steel I beam would I need to replace a flitch beam that is constructed of 2 doug fir 2x12x20ft with steel plate bolted inbetween. this beam supports roof truss's on 24" centers and are approx 30' long with support in center.
Jgrasmehr
Jgrasmehr





RE: replace flitch beam with steel I beam
The span of the beam to be replaced
the code loading on the roof trusses
Constraints on depth, deflection etc.
Is this beam at the internal bearing of the roof trusses or in an exterior wall?
RE: replace flitch beam with steel I beam
RE: replace flitch beam with steel I beam
RE: replace flitch beam with steel I beam
Assuming:
LL=20psf
DL=10psf
span=20'
Lu (Unbraced lenght)=20'
tributary area=30/2 + 2/2 = 16' using 1/2 the 30' span + 1/2 the 2' between the beam and garage
steel= A36
pinned end conditions
load duration factor=1
W flange
deflection allowable L/360
Summary
W8x28 is the min size
12,530 psi bending stress
2,210 shear stress
Max def .664"
You can of course, determine the bearing and attachment methods.
RE: replace flitch beam with steel I beam
How about you contact a local engineer to look at your specific problem, this site is not really the place to get a specific answer.
regards
sc
RE: replace flitch beam with steel I beam