Ch.1 Problem 1.12 Solution - Edubirdie

University:
Michigan State University
Course:
ERG 100 | Introduction to Engineering Design
Academic year:

2021
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490

Pages:

1
Author:

Accinkiquicpqw

PROBLEM 1.12 For the Pratt bridge truss and loading shown, determine the average normal stress in member BE, knowing that the crosssectional area of that member is 5.87 in2. SOLUTION  Use entire truss as free body. ΣM H = 0: (9)(80) + (18)(80) + (27)(80) − 36 Ay = 0 A y = 120 kips Use portion of truss to the left of a section cutting members BD, BE, and CE.   + ↑ Σ F y = 0: 120 − 80 − σBE = 12 F =0 15 BE ∴ FBE = 50 kips FBE 50 kips = A 5.87 in 2 σ BE = 8.52 ksi W 

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