Steel Design (Activate Learning with these NEW titles from Engineering!)
6th Edition
ISBN: 9781337094740
Author: Segui, William T.
Publisher: Cengage Learning
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Chapter 10, Problem 10.7.9P
To determine
(a)
The design of the girder cross section by using LRFD.
To determine
(b)
The location and size of intermediatestiffeners.
To determine
(c)
The required size of bearing stiffeners at B, C and D
To determine
(d)
The design of all the welds.
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A bridge girder AB on a simple span of length L = 20 m supports a distributed load of maximum intensity q at midspan and minimum intensity q/2 at supports A and B that includes the weight of the girder (see figure). The girder is constructed of three plates welded to form the cross section shown.
(a) Determine the maximum permissible load q based upon an allowable bending stress sigma = 140 MPa. Round to the nearest tenth.
qmax = ___ kN/m
(b) Determine the maximum permissible load q based upon an allowable shear stress Tau = 60 MPa. Round to the nearest tenth.
qmax = ___ kN/m
W
W.
W
Mp
0.8 Mp
Mp
The above figure shows a continuous beam loaded
with concentrated loads 'W' at the centre of each
span. The value of 'W' at collapse will be
F1
Determine the reaction forces for girder G-1.
Column A
Beam B-1
L1
-0
Beam B-2
F2
Girder G-1
Please round to the nearest one.
Reaction force for Girder G-1 (Column A side) =
Girder G-2
L1
After the initial calculation, we determined the following information:
• The reaction force for Beam B-2 (Girder G-1 side) = 17,890 lbs
• The reaction force for Beam B-3 (Girder G-1 side) = 15,685 lbs
Reaction force for Girder G-1 (Column B side) =
80
F3
•
Live
load 50 psf
• Dead load: (1) Slab = 50 psf, (2) Deck = 10 psf, (3) Mechanical equipment = 8 psf, (4) Suspended ceiling = 8 psf
(5) Beam = 25 lb/ft, (6) Girder = 35 lb/ft
• Beam and Girder spacing:: (1) L1 = 14 ft, (2) L2 = 10 ft, (3) L3 = 10 ft
Beam B-3
000
000
F4
lbs
open
lbs
F5
L1
Column B
Beam B-4
L2
F6
L3
MacBook Air
←
F7
F8
Chapter 10 Solutions
Steel Design (Activate Learning with these NEW titles from Engineering!)
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- A bridge girder AB on a simple span of length L = 20 m supports a distributed load of maximum intensity q at midspan and minimum intensity g/2 at supports A and B that includes the weight of the girder (see figure). The girder is constructed of three plates welded to form the cross section shown. 500 mm L= 20 m 18 mm 1600 mm 500 mm (a) Determine the maximum permissible load q based upon an allowable bending stress oallow = 130 MPa. Round to the nearest tenth. kN Gmax = (b) Determine the maximum permissible load q based upon an allowable shear stresS Tallow = 55 MPa. Round to the nearest tenth. kN Gmax marrow_forwardFrom the given figure below, determine the maximum flexural stress of the beam if it has a cross section of 150mm wide by 250mm deep. (JN 10 N/m o' RA=42N 42N 3M B IM 75Nm 81NM Im RD=3N -3N 0° 78 Nm 3NM V-DIAG M-DIAGarrow_forward1. Replace the existing beam with a wide flange structural steel. The maximum flexural stress of steel is limited to 120 MPа. 50 KN 250 mm T 50 mm 10 KN/m 20 KN/m 350 mm 200 mm 3 m 2 m В 4 m Aarrow_forward
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