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This document addresses two engineering problems involving axial loads on structural bars. The first problem analyzes a flat steel bar subjected to axial loads at points A, B, C, and D, determining axial stress at specific cross-sections based on given parameters. The second problem involves a round bar with sections made of steel, brass, and aluminum. It requires calculating the necessary diameters for each section to ensure they meet specified allowable axial stresses under applied loads. Detailed calculations and principles of structural mechanics are applied throughout.
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A flat steel bar has axial load applied at points A,B,C and D as shown in fig if the bar has a cross-sectional area of 3 in2 determine the axial stress in the bar. (a) on a cross section 20 in . To the right of point A . (b) on a cross section 20 in.to the right of point B. (c) on a cross section 20 in .the right of point C. Example problem 1-1
30” 45” 40” 81kip 54kip 18kip 45kip C D A B
The round bar shown if fig has stell,brass,and aluminum sections. axial loads are applied at cross sections A,B,C and D. if the allowable axial normal stresses are 125 Mpa in the steel,70Mpa in the brass,85Mpa in the aluminum, determine the diameters required for each of the sections. EXAMPLE PROBLEM 1-2
C Aluminum D B Brass 225KN A steel 200KN 245KN 270KN 0.5m 0.5m 0.5m
