STEEL DESIGN W/ ACCESS
6th Edition
ISBN: 9781337761499
Author: Segui
Publisher: CENGAGE L
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Textbook Question
Chapter 2, Problem 2.3P
A beam is part of the framing system for the floor of an office building. The floor is subjected to both dead loads and live loads. The maximum moment caused by the service dead load is 45 ft-kips, and the maximum moment for the service live load is 63 ft-kips (these moments occur at the same location on the beam and can therefore be combined).
a. If load and resistance factor design is used, determine the maximum factored bending moment (required moment strength). What is the controlling AISC load combination?
b. What is the required nominal moment strength for a resistance factor
c. If allowable strength design is used, determine the required moment strength. What is the controlling AISC lead combination?
d. What is the required nominal moment strength for a safety factor
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A two-dimensional beam structure or frame (ABCD, shown below) has a concentrated load, P, acting
on Point D. You can assume that the connections at B and C have sufficient strength to react the
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B
A
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In order to evaluate the design you must:
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(b) Use any method to determine the vertical deflection at Point D. Ensure that you clearly explain
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(c) If the bending rigidity, El, of the frame between Point B and Point C was doubled. What effect
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supported by suitable reasoning, calculations and/or sketches.
A wooden beam is fabricated from three boards, which are fastened together with screws, as shown. The screws are uniformly spaced
along the span of the beam at intervals of 250 mm. In service, the beam will be positioned so that bending occurs about the z axis. The
maximum bending moment in the beam is Mz- -4.88 kN-m, and the maximum shear force in the beam is Vy=-3.4 kN. Assume s-250
mm, b. 23 mm, b₂100 mm, d₁-210 mm. d₂-32 mm. Determine:
(a) the magnitude of the maximum horizontal shear stress fax in the beam.
(b) the shear force F in each screw.
(c) the magnitude of the maximum bending stress max in the beam.
Answers:
(a) Fmax
(b) F-
(c) Omas
MPa.
N per screw.
MPa.
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THE BEAM SHOWN BELOW HAS THE FOLLOWING PROPERTIES. f’c =30 MPa, fc=13.5 MPa, fy=400 MPa, fs=200MPa. DETERMINE THE FOLLOWING.
d)THE MOMENT CAPACITY OF THE BEAM ASSUMING IT IS UNCRACKED.
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