Structural Steel Design (6th Edition)
6th Edition
ISBN: 9780134589657
Author: Jack C. McCormac, Stephen F. Csernak
Publisher: PEARSON
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Chapter 11, Problem 11.12PFS
To determine
The given braced frame member is adequate or not.
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1. Determine the force in each member of the loaded truss. All triangles are 3-4-5. Indicate
whether it is compression or tension. Use method of joint.
C 40KN
B
XX
H
G
-4 panels at 8 m-
A
32 KN
22 KN
F
D
E
Problem 6.2
Determine the forces in members (a) AB, (b) BC, (c) CJ, (d) DI, and (e) JI in each truss. Note that the trusses are
symmetrical and make sure to note if a given member is in tension (T) or compression (C).
4k
8k
D
VC
8k
H
3'
truss one
3'
8k
H
4k
I-
3'
3' 3'
3
8k
8k
truss two
H
8k
41
Problem# 3: Select a Tee-shape for the top chord of the truss given in Figure 4 using LRFD
approach. P consists of dead load of 60 kN and snow load of 40 kN. Note that a lateral bracing
is provided at each joint in the out-of-plane direction.
1.5m
P/2
2m
P
A
2m
A
P
I
2m
-Top chord-
P
2m
IP
2m
Ť
Section A-A
P
2m
P/2
Chapter 11 Solutions
Structural Steel Design (6th Edition)
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- The given girder has beams framing into it at the ends and at every L/3 point. The beam carries a service live load of 20 kips as shown and superimposed uniformly distributed service dead load of 10 kip/ft. Select the lightest A992 W-section that can carry the load. Do not check for deflection. P, = 20 kips LL PLL W. = 10 kip/ft DL = 20 ft WDL L/3 BEAMS FRAMING INTO GIRDER Larrow_forwardA bracket of length 1.5m is rigidly attached to the simply-supported beam at its end. The beam is subjected to the combined effect of M,, M, and compressive force P caused by the factored loads as shown. There are lateral supports only at the ends. The member is made of HE300A section and steel grade is S275 (Fy-275MPA, Fu= 430 MPa). The loads acting are determined from LRFD combinations. Determine whether the member can safely carry the applied loads. Multiply first-order moment diagrams by a factor of 1.2 to account for second-order effects. No need to check shear limit state. You do not need to additionally consider the beam self-weight. E Use the following simple expression to calculate the value of L:: L, = T*rts 0.7*Fy y P = 400kN 1.5 m F = 150kN 2 т 4 т X: Lateral support НЕЗ00Аarrow_forward5. The beam-column has a height of 7.5m and is a member of a braced frame. It is subjected to an axial load of DL-65KN and LL= 1OOKN. It is pinned at both ends. A W12X35 section was used and was made up of A-36 steel with Fy-250MPA. Compute the interaction value for beam- column based on NSCP 2015 code provisions. Ngelect the weight of the section. A = 6645 mm2 Zx- 839x10^3 mm3 d- 317.50mm Sx- 747x10^3 mm3 tw= 7.62 Rx= 133.35 bf= 166.62 ly= 10x10^6 mm4 tf- 13.21 Sy= 122x10^3 mm3 Ix= 119x10^6 mm4 Ry3 39.12mm 3.5 Note: Use C=D1.00%--0.2arrow_forward
- Determine the force in each member of the loaded truss. All triangles are 3-4-5. Indicate whether it is compression or tension. Use method of joint. 40KN A 32 KN B H C N G 4 panels at 8 m- 22 KN F D Earrow_forwardQ4: Calculate the forces induced in members KL, CL, and CB by the 20-ton load on the cantilever truss. M K 26 16' G F D B A -6 panels at 12' 20 tonsarrow_forwardThe steel frame (E=200 GPa) shown has a diagonal brace BD with an area of 1920 mm2. Determine thelargest allowable load P if the change in length of member BD is not to exceed 2.5 mmarrow_forward
- A W 12 x 58 beam-column member in a braced frame must support the service loads in the Fig. P11-12. The member is A992 steel, Cb may be assumed to be 1.0, and bending is about the strong axis.The member is laterally braced at its ends only and Lx = Ly = 16 ft. Is the member adequate?arrow_forwardthe two-span The static indeterminacy of the continuous beam with an internal hinge, shown below, is TTTTTT TITT Thomarrow_forwardDetermine the force in each of the members located to the left of FG for the scissors roof truss shown. State whether each member is in tension or compression. 1 kN 2 kN Во C 2 kN Do E 2 m 2 m 1 kN Fo G 2 m 2 m H K 2 m J. 2 m 1 m 1 m 1 m 1 m L1 m Show complete solutions and diagrams. Original work please I will upvotearrow_forward
- F6-8. Determine the force in members LK, KC, and CD of the Pratt truss. State if the members are in tension or compression. F6-9. Determine the force in members KJ, KD, and CD of the Pratt truss. State if the members are in tension or compression. AN B -2 m--2m--2m--2m--2m--2m- 20 KN 30 KN 40 KN F6-8/9 3m Aarrow_forwardProblem 1 - Frame members ABCD and EFG are continuous. Determine the forces in links BF and DG. 0.75L 0.75. D 1m 4KN Farrow_forward3- Determine the force in each member of the truss. State if the members are in tension or compression. 3k 15 a F6tt-6ft St- 8 t Sftarrow_forward
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