For the beam cross section shown, bending is about the z axis. All dimensions are in inches and, where appropriate, are between the centers of the 0.25-in walls. Determine (a) the second-area moments I, Iz, and Iyz. (b) the orientation of the principal axes of the second-area moments. (c) the values of the principal second-area moments Im and In- (d) the location and magnitudes of the maximum tensile and compressive bending stresses if M₂ 20 kip-in. = y

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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**Beam Cross Section Analysis**

**Problem Statement:**

For the beam cross section shown, the bending is about the z-axis. All dimensions are in inches and, where appropriate, are between the centers of the 0.25-inch walls. Determine:

(a) The second-area moments \( I_y \), \( I_z \), and \( I_{yz} \).

(b) The orientation of the principal axes of the second-area moments.

(c) The values of the principal second-area moments \( I_m \) and \( I_n \).

(d) The location and magnitudes of the maximum tensile and compressive bending stresses if \( M_z = 20 \text{ kip}\cdot\text{in.} \)

**Diagram Description:**

- The diagram is an L-shaped beam cross section.
- The vertical section of the L is 6 inches tall.
- The horizontal section at the top extends 2 inches to the left.
- The bottom horizontal section extends 2 inches to the right.
- The walls of the beam are 0.25 inches thick.
- The coordinate system has the y-axis pointing upwards and the z-axis pointing to the left.

This cross section analysis requires the calculation of the second moments of area and understanding how the cross-sectional shape contributes to its resistance to bending.
Transcribed Image Text:**Beam Cross Section Analysis** **Problem Statement:** For the beam cross section shown, the bending is about the z-axis. All dimensions are in inches and, where appropriate, are between the centers of the 0.25-inch walls. Determine: (a) The second-area moments \( I_y \), \( I_z \), and \( I_{yz} \). (b) The orientation of the principal axes of the second-area moments. (c) The values of the principal second-area moments \( I_m \) and \( I_n \). (d) The location and magnitudes of the maximum tensile and compressive bending stresses if \( M_z = 20 \text{ kip}\cdot\text{in.} \) **Diagram Description:** - The diagram is an L-shaped beam cross section. - The vertical section of the L is 6 inches tall. - The horizontal section at the top extends 2 inches to the left. - The bottom horizontal section extends 2 inches to the right. - The walls of the beam are 0.25 inches thick. - The coordinate system has the y-axis pointing upwards and the z-axis pointing to the left. This cross section analysis requires the calculation of the second moments of area and understanding how the cross-sectional shape contributes to its resistance to bending.
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