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 11.15PFS
To determine
The adequacy of member using LRFD method.
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Part 2
A Pratt roof truss is loaded as shown. Using the method of joints and the method of
sections, determine the force in all members.
the force P.325KN
80 kN
P kN
60 kN
D
H
8 m
60 kN
A
G---Y.
MATHaling.com
6 m
6 m
E
6 m
40 kN
100 kN
6 m
2 A simply supported beam has a dimension of 300mmw x 600mmh has a span of
6m. it has a superimposed load of 30KN/m and live load of 50KN. It has a
specified concrete strength of 28MPa and yield strength of 420MPa. Distance of
centroid steel area to outermost fiber is 60mm.
a. What is the maximum moment of the beam?
b. What is the required tension steel area? Use et = 0.004
A flitch beam is composed of two 50x300mm planks reinforced with a 12.5mm steel plate as shown. Assume that continuous lateral support is furnished by a floor system supported by the beam. Use A36 steel with an allowable bending stress of 150 MPa, Fy = 250 MPa. Es = 200,00MPa, Ew = 7692MPa, fw = 4.3 MPa. The beam is on a simple span of 4.8m and supports a uniformly distributed load of 7.3 kN/m which includes the weight of the beam. Allowable stresses for shear: Steel: fv = 0.60Fy MPa Wood: fv = 0.58 MPa Determine the following: a.) The resisting moment of the flitch beam b.) The applied moment to the flitch beam c.) The shear capacity of the flitch beam
Chapter 11 Solutions
Structural Steel Design (6th Edition)
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- For the below truss system and loading: Complete an approximate analysis assuming the diagonals are effective in compression to determine the forces in the diagonals. F E D CzZZ 3m A ZZZ 10KN 4m B 20KN 4m 10KNarrow_forwardThe double web girder is constructed from two plywood sheets that are secured to wood members at its top and bottom. Each fastener can support 60lb in single shear. Determine the required spacing, s, of the fasteners needed to support the loading of 2800lb. Assume A is pinned and B is a roller.arrow_forwardb) This is a concrete frame (the interior lines represent reinforcing bars), If P is dead load, draw the BMD and the SFD as a result of ULTIMATE LOAD. 6.0 ft. P= 1.0 Kip Own weight of the beam = 1.0 kip/ft. (Uniform dead load)arrow_forward
- Example 2 of Method of Sections: Determine the force in member EB of the FBD of the roof truss shown in the Figure below. Indicate the member in compression (C) or in tension (T). 1000 N 3000 N 1000 N E 1000 N 2 m -2 m -2 m -2 m 4000 N 2000 Narrow_forward20 k G 01. Determine the force in each member of 15 ft F 10k the truss shown below. Indicate if the 10 k E members are in tension or compression. Assume all members are pin connected. 10 ft 20 k 20 k 25 ft 15 10 25 25 15 ft PROBLEM 1 TABLE OF FORCES: МЕМBER NUMBER FORCE (k) AE 1 EG GF 3 BF AC 5 CD BD СЕ 8 CG DG 10 DF 11 67arrow_forwardH.W. (2) Determine the design moment strength for an isolated T beam, the flange is 100 mm thickness, and 750 mm width. The web width is 200 mm and the effective depth is 430 mm, the beam is rienforced with 3 0 29 as tension reinforcement, fc'=20 MPa and fy=420 MPaarrow_forward
- Determine the largest tensile and compressive forces that occur in the members of the truss and indicate the members in which they occur if (a)the dimension h = 5??. (b)the dimension h = 10 ??. Observe how a simple change in design affects the maximum axial loads.arrow_forwardQI: Determine the forces in all members for the truss shown below and state whether the members in tension or compression? D 5m Sm Sm B. A. 12m 12m P.arrow_forwardDETERMINE THE STRESS IN EACH MEMBER OF TRUSS LOADED AND SUPPORTED AS SHOWN. RAN SOON. a 2 300N 300 H S 4 C 6 ५०० 7 f 12m d 9 10 11 300N 12 13 B R5 3marrow_forward
- Problem 3 The frame shown is subjected to lateral loads acting at I and E. Assume all columns have the same cross sectional area. Note: all beams are 20 meters in length and all columns are 12 meters in height. Using Cantilever Method determine the following: 8 kN ... 10 kN F G H A В Darrow_forwardThe loaded steel framing shown consists of bars 1, 2, and 3 with their corresponding flexural rigidity. The leftmost side is clamped (fixed support), the opposite side hinged, and a roller support at the middle. If each bar may be subjected to Euler buckling and a = 3 m, Determine the critical load for each member. Calculate the factor of safety (F.S.) of the whole frame against buckling. At what value of P will the frame start to have a buckled member? GIVEN: P = 143 Kn I1 (x109 mm4) = 3.7860 Note: Joints where members meet can be treated as pin.arrow_forwardDetermine the maximum uniform load w that the beam can carry using A-36 steel. The lateral supports are as shown below. 0.8w 3 lateral supports 4.5m 5m W18X50arrow_forward
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