The attached sketch shows the ROOF FRAMING PLAN of a proposed building. 1. Assuming that the full lengths of the compression flanges of Roof Beams RB1 and RB2 are laterally supported: a) Select the least-weight wide flange member for Roof Beam RB1 b) Select the least-weight wide flange member for Roof Beam RB2 Assume Combined Dead Load & Self-Weight of Beams : 45 PSF; Live load: 75 PSF (4 points) (4 points) 2. a) Using the loads from Question 1 determine the Maximum Moment (Mmax) and Maximum Shear Force (Vmax) acting on Roof Girder RG4 (2points) b) Assuming that the Compression Flange of Roof Girder RG4 is laterally supported at the supports and at 5ft intervals only (Lb=5ft) determine if a proposed W21x50 section is adequate to carry the loads acting on RG4 i) Determine Allowable Moment from the Lateral -Torsional Buckling Equation Mn/2b Cb (Mp/Qb - BF(Lb-Lp)) (7 points) Assume where Cb 1.0 b Select values of Mp/Qb, BF/Qb, Lp, from AISC Steel Construction Manual Table 3-2 (ii) Determine Allowable Shear Force (3 points) Select value of Vn/Qv from AISC Steel Construction Manual Table 3-2 and compare with maximum applied Shear Force Minimum Yield Strength of Steel is 50 ksi Safety factor for bending Qb = 1.67 Safety Factor against Shear Failure Qy = 1.50 30'-0" 0.01 0.01 150'-0" 30'-0" 10'-0" 0.0% 0.01 0:08 10'-0" 10'-0" 10'-0" RG1 RB1 RB2 FRAMING PLAN(ROOF) SCALE: NTS RB2 RG1 RB2 30'-0" 10'-0" ות.-ה.. .0-0% RB2 RG1 RB2 10'-0" RB2 0.01 RG1 RB2 0.0 10'-0" 10'-0" RB2 RB2 RB2 RB5 RG2 RB2 RB6 RG3 RB7 RB4 RG4 RB3 RB1 RB2 RG1 RB2 RG1 RB2 RB2 RB2 26'-0" RB1 RB3 RG2 RB6 RB4 RG3 RG4 RB5 RB2 RB2 ELEVATOR SHAFT RB2 RB2 RB2 RB2 RB2 RB7 RB2 74'-0" 22-0 11'-0" 11'-0" RB2 RG4 RB2 RB2 RB2 RB1 RG1 26'-0"
The attached sketch shows the ROOF FRAMING PLAN of a proposed building. 1. Assuming that the full lengths of the compression flanges of Roof Beams RB1 and RB2 are laterally supported: a) Select the least-weight wide flange member for Roof Beam RB1 b) Select the least-weight wide flange member for Roof Beam RB2 Assume Combined Dead Load & Self-Weight of Beams : 45 PSF; Live load: 75 PSF (4 points) (4 points) 2. a) Using the loads from Question 1 determine the Maximum Moment (Mmax) and Maximum Shear Force (Vmax) acting on Roof Girder RG4 (2points) b) Assuming that the Compression Flange of Roof Girder RG4 is laterally supported at the supports and at 5ft intervals only (Lb=5ft) determine if a proposed W21x50 section is adequate to carry the loads acting on RG4 i) Determine Allowable Moment from the Lateral -Torsional Buckling Equation Mn/2b Cb (Mp/Qb - BF(Lb-Lp)) (7 points) Assume where Cb 1.0 b Select values of Mp/Qb, BF/Qb, Lp, from AISC Steel Construction Manual Table 3-2 (ii) Determine Allowable Shear Force (3 points) Select value of Vn/Qv from AISC Steel Construction Manual Table 3-2 and compare with maximum applied Shear Force Minimum Yield Strength of Steel is 50 ksi Safety factor for bending Qb = 1.67 Safety Factor against Shear Failure Qy = 1.50 30'-0" 0.01 0.01 150'-0" 30'-0" 10'-0" 0.0% 0.01 0:08 10'-0" 10'-0" 10'-0" RG1 RB1 RB2 FRAMING PLAN(ROOF) SCALE: NTS RB2 RG1 RB2 30'-0" 10'-0" ות.-ה.. .0-0% RB2 RG1 RB2 10'-0" RB2 0.01 RG1 RB2 0.0 10'-0" 10'-0" RB2 RB2 RB2 RB5 RG2 RB2 RB6 RG3 RB7 RB4 RG4 RB3 RB1 RB2 RG1 RB2 RG1 RB2 RB2 RB2 26'-0" RB1 RB3 RG2 RB6 RB4 RG3 RG4 RB5 RB2 RB2 ELEVATOR SHAFT RB2 RB2 RB2 RB2 RB2 RB7 RB2 74'-0" 22-0 11'-0" 11'-0" RB2 RG4 RB2 RB2 RB2 RB1 RG1 26'-0"
Steel Design (Activate Learning with these NEW titles from Engineering!)
6th Edition
ISBN:9781337094740
Author:Segui, William T.
Publisher:Segui, William T.
Chapter9: Composite Construction
Section: Chapter Questions
Problem 9.2.1P: A W1422 acts compositely with a 4-inch-thick floor slab whose effective width b is 90 inches. The...
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Transcribed Image Text:The attached sketch shows the ROOF FRAMING PLAN of a proposed building.
1. Assuming that the full lengths of the compression flanges of Roof Beams
RB1 and RB2 are laterally supported:
a) Select the least-weight wide flange member for Roof Beam RB1
b) Select the least-weight wide flange member for Roof Beam RB2
Assume Combined Dead Load & Self-Weight of Beams : 45 PSF;
Live load: 75 PSF
(4 points)
(4 points)
2.
a) Using the loads from Question 1 determine the Maximum Moment (Mmax)
and Maximum Shear Force (Vmax) acting on Roof Girder RG4 (2points)
b) Assuming that the Compression Flange of Roof Girder RG4 is laterally
supported at the supports and at 5ft intervals only (Lb=5ft)
determine if a proposed W21x50 section is adequate to carry the loads
acting on RG4
i) Determine Allowable Moment from the Lateral -Torsional
Buckling Equation
Mn/2b Cb (Mp/Qb - BF(Lb-Lp))
(7 points)
Assume
where Cb 1.0
b
Select values of Mp/Qb, BF/Qb, Lp, from AISC Steel
Construction Manual Table 3-2
(ii) Determine Allowable Shear Force
(3 points)
Select value of Vn/Qv from AISC Steel Construction Manual
Table 3-2 and compare with maximum applied Shear Force
Minimum Yield Strength of Steel is 50 ksi
Safety factor for bending Qb = 1.67
Safety Factor against Shear Failure Qy = 1.50
Transcribed Image Text:30'-0"
0.01
0.01
150'-0"
30'-0"
10'-0"
0.0%
0.01
0:08
10'-0"
10'-0"
10'-0"
RG1
RB1
RB2
FRAMING PLAN(ROOF)
SCALE: NTS
RB2
RG1
RB2
30'-0"
10'-0"
ות.-ה..
.0-0%
RB2
RG1
RB2
10'-0"
RB2
0.01
RG1
RB2
0.0
10'-0"
10'-0"
RB2
RB2
RB2
RB5
RG2
RB2
RB6
RG3
RB7
RB4
RG4
RB3
RB1
RB2
RG1
RB2
RG1
RB2
RB2
RB2
26'-0"
RB1
RB3
RG2
RB6
RB4
RG3
RG4
RB5
RB2
RB2
ELEVATOR
SHAFT
RB2
RB2
RB2
RB2
RB2
RB7
RB2
74'-0"
22-0
11'-0"
11'-0"
RB2
RG4
RB2
RB2
RB2
RB1
RG1
26'-0"
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