D0 Silicon Upgrade: Lower Cleanroom Roof Quick Load Analysis Page: 2 of 9
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This engineering note documents calculations done to determine the
margin of safety for the lower clean room roof. The analysis was
done to give me a feeling of what the loads, stresses and capacity of
the roof is prior to installation and installation work to be done for
the helium refrigerator upgrade.
Ksults & Conclusion
The result of this quick look showed that the calculated loads
produce stress values and loads at about half the allowables. Based
on this result, I do not think that special precautions above personal
judgement are required for the installation work.
1.) Uniform floor loading of 50 lbs./ft^2 to account for rated capacity.
2.) Uniform floor loading of 3.1 lbs./ft^2 for the corrugated floor.
3.) Roof hatch weight of 28 lb/ft on support beams plus 3.1 lbs./ftA2
for the skin material. (Total weight used = 1360 lbs.)
4.) Dead weight of the W8 x 21 beams. (Actually used 28 lbs./ft in
5.) Dead weight of upgrade piping along south wall, 150 lbs. at each
support beam location. Total weight = 750 lbs.
S trsses/Load Capacities
Beams: Worst loaded beams are those to the east and west of the
hatch. This worst loaded beam was the only one analyzed. There
was a 3580 lb reaction at the north end of this beam and a 4700 lb
reaction at the south end. The highest bending moment was 241,275
in-lbs which results in a bending stress of 13.3 ksi. The allowable
bending stress per the AISC manual is 23.8 ksi. The shear stress was
not calculated but would be very low ( less than 3 ksi) compared to
the AISC manual allowable shear stress of 16.8 ksi.
Framed connection: A framed connection is used to attach beams
to beams and the beams to the wall. A 5 x 5 x 3/8" angle with two
3/4" dia. bolts are used on each side of the web. The allowable load
for this connection based on the bolts (which I assume are low
quality A307) is 17,700 lbs. The calculated load was 4700 lb.
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Rucinski, Russ. D0 Silicon Upgrade: Lower Cleanroom Roof Quick Load Analysis, report, November 17, 1995; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc845557/m1/2/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.