50 FOOT BEAM SPAN QUESTIONS
50 FOOT BEAM SPAN QUESTIONS
(OP)
I am looking at a project and have some questions that I am hoping someone might be able to answer for me. The building is 50' by 130' with a 11' ceiling height between the beams.
There are 7"x26"X50' glulam beams every 13'. The exterior walls are cinder block with a cinder block column which the beams sit on. There are 2x10 rafters between the beams making a flat roof. I need more interior height. I dont want to raise the walls. What I want to do is remove the rafters, install double trusses on the sides of the beam and then finish the roof as if it was a pole building. The Truss company is telling me that they can build trusses that sit on top of the beam or bolt to the sides of the beams. I am curious as to peoples opinions on which way is better and why. the snow load is 25lbs and wind is 85.
There are 7"x26"X50' glulam beams every 13'. The exterior walls are cinder block with a cinder block column which the beams sit on. There are 2x10 rafters between the beams making a flat roof. I need more interior height. I dont want to raise the walls. What I want to do is remove the rafters, install double trusses on the sides of the beam and then finish the roof as if it was a pole building. The Truss company is telling me that they can build trusses that sit on top of the beam or bolt to the sides of the beams. I am curious as to peoples opinions on which way is better and why. the snow load is 25lbs and wind is 85.





RE: 50 FOOT BEAM SPAN QUESTIONS
When was the building constructed? The loads have changed some, but not that much, and the beam size apparently is an older one, maybe only 2000 psi. depending on the date of erection.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
Are you removing the roofing to include the 2X10's and installing new 4:12 pitch trusses to either side of the glulams to get a sloped roof?
As Hokie suggested, a sketch and/or further explanation would help here immensely.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 50 FOOT BEAM SPAN QUESTIONS
Garth Dreger PE
AZ Phoenix area
RE: 50 FOOT BEAM SPAN QUESTIONS
option 1
trusses supported only at the ends and carting all the load. This requires a triple truss
option 2
trusses sit on top of trusses and transfer weightto gbe beam. This requires a double truss
option3
trusses are next to beam and beam is attached to bottom cord of truss at each diagonal. This two would be a double truss
from what I have found out all three options are possible. I am ttying to figure out which one makes the most sense
thanks for the input
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
1. the top of 2x10 rafter is flush with top of glulam beam?
2. the 2x10 rafter is perpendicular to glulam beam?
B. how much height are you trying to gain?
C. is the height gain desired along the entire length of the glulam or just a portion?
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
RE: 50 FOOT BEAM SPAN QUESTIONS
Yea, like that's going to happen...
But, hey, we all need the work, don't we?
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask