Two couples act on the frame. If d = 4 ft, determine the resultant couple moment. Compute the result by resolving each force into x and y components and (a) finding the moment of each couple and (b) summing the moments of all the force components about point B. Solution: Mc = 53.4 lb-ft cw -4 ft -3 ft 60 lb 40 lb B 1 ft 30/ 60 lb 30 2 ft 40 lb

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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### Problem Statement
Two couples act on the frame. If \( d = 4 \, \text{ft} \), determine the resultant couple moment. Compute the result by resolving each force into x and y components and (a) finding the moment of each couple and (b) summing the moments of all the force components about point B. 

**Solution:** \( M_c = 53.4 \, \text{lb-ft cw} \).

### Diagram Explanation
The diagram shows a frame with two forces acting on it. 

- **Dimensions:**
  - Distance along the x-axis from point A to point B is 1 ft.
  - Vertical distance from base to point B is 4 ft.
  - Horizontal beam from B to the end is 4 ft.
  - Vertical beam from the horizontal beam to its base is 3 ft.

- **Forces:**
  - A 40 lb force is applied at a 30° angle from the horizontal at point A.
  - A 60 lb force is applied at point B at a 4:3 ratio angle (implying that there might be a similar triangle relationship here).

### Analysis
1. **Resolve Forces into Components:**
   - Break down each force into x and y components using trigonometric functions (sine and cosine).

2. **Calculate Moment:**
   - Moments are calculated as the product of force and the distance perpendicular to the line of action of the force.
   - Sum the moments created by each component about point B.

3. **Resultant Moment:**
   - Combine these to find the resultant couple moment, confirming the solution: \( M_c = 53.4 \, \text{lb-ft cw} \).

This task demonstrates the application of static equilibrium and force resolution techniques to determine moments in mechanical systems.
Transcribed Image Text:### Problem Statement Two couples act on the frame. If \( d = 4 \, \text{ft} \), determine the resultant couple moment. Compute the result by resolving each force into x and y components and (a) finding the moment of each couple and (b) summing the moments of all the force components about point B. **Solution:** \( M_c = 53.4 \, \text{lb-ft cw} \). ### Diagram Explanation The diagram shows a frame with two forces acting on it. - **Dimensions:** - Distance along the x-axis from point A to point B is 1 ft. - Vertical distance from base to point B is 4 ft. - Horizontal beam from B to the end is 4 ft. - Vertical beam from the horizontal beam to its base is 3 ft. - **Forces:** - A 40 lb force is applied at a 30° angle from the horizontal at point A. - A 60 lb force is applied at point B at a 4:3 ratio angle (implying that there might be a similar triangle relationship here). ### Analysis 1. **Resolve Forces into Components:** - Break down each force into x and y components using trigonometric functions (sine and cosine). 2. **Calculate Moment:** - Moments are calculated as the product of force and the distance perpendicular to the line of action of the force. - Sum the moments created by each component about point B. 3. **Resultant Moment:** - Combine these to find the resultant couple moment, confirming the solution: \( M_c = 53.4 \, \text{lb-ft cw} \). This task demonstrates the application of static equilibrium and force resolution techniques to determine moments in mechanical systems.
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