Explanation Given information: The maximum stress is 80 MPa . Calculation: Show the cross section shown in Figure 1 The width and depth of rectangle PQRS is b = 300 mm and d = 300 mm . The width and depth of rectangle 1 is b 1 = 210 mm and d 1 = 260 mm . Calculate the moment of inertia about neutral axis. I = b d 3 12 − b 1 d 1 3 12 (1) Here, b is the largest width of the rectangle, d is the largest depth of the rectangle, b 1 is the smallest width of the rectangle, and d 1 is the smallest depth of the rectangle. Substitute 300 mm for b , 300 mm for d , 210 mm for b 1 , and 260 mm for d 1 in Equation(1). I = 300 × 300 3 12 − 210 × 260 3 12 = 675 , 000 , 000 − 307 , 580 , 000 = 367 , 420 , 000 mm 4 ( 1 m 4 10 12 mm 4 ) = 0

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ISBN: 9780133254426

Author: Russell C. Hibbeler

Publisher: Prentice Hall

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Chapter 6.4, Problem 6.76P

To determine

The moment (M) that must be applied to the beam in order to create stress of 80 MPa.

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Chapter 6.4, Problem 6.75P

Chapter 6.4, Problem 6.77P

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The moment ( M ) that must be applied to the beam in order to create stress of 80 MPa.

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The moment (M) that must be applied to the beam in order to create stress of 80 MPa.

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