5 kN 70 6KN 30 7 kN

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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### Equilibrium of a Truss System

**Problem Statement:**
The members of a truss are pin connected at joint O. Determine the magnitude of \( F_1 \) and its angle for equilibrium.

#### Diagram Description:
The diagram shows a truss system with forces acting at specific angles from the pin joint O:
- A force of 5 kN is acting in the negative y-direction.
- A force of 6 kN is acting in the positive x-direction.
- A force of 7 kN is acting at an angle of 30° below the negative x-axis.
- An unknown force \( F_1 \) is acting at an angle θ below the positive x-axis.

The diagram also depicts an xy-coordinate system with the origin at the pin joint O.

#### Steps to Solve:
1. **Resolve All Forces into Components:**
   - For the 5 kN force: only the y-component.
   - For the 6 kN force: only the x-component.
   - For the 7 kN force: both x and y-components.
   - For the unknown force \( F_1 \): dependent on the angle θ.

2. **Apply Equilibrium Conditions:**
   - Sum of all horizontal forces must be zero.
   - Sum of all vertical forces must be zero.

3. **Equations Derived:**
   - ΣF_x = 0 (Total horizontal forces must balance)
   - ΣF_y = 0 (Total vertical forces must balance)

#### Inputs for Solution:
- **Angle and Forces:**
   - \( F_x = F_1 \cos(θ) - 6 kN + 7\cos(30°) kN = 0 \)
   - \( F_y = F_1 \sin(θ) - 5 kN - 7\sin(30°) kN = 0 \)

**After solving these equations, the magnitude of \( F_1 \) and its angle θ can be determined.**

#### Answer Submission
Your answer: [text box for student's answer]

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By understanding and solving such equilibrium problems, it helps in designing stable and efficient truss structures for various engineering applications.
Transcribed Image Text:### Equilibrium of a Truss System **Problem Statement:** The members of a truss are pin connected at joint O. Determine the magnitude of \( F_1 \) and its angle for equilibrium. #### Diagram Description: The diagram shows a truss system with forces acting at specific angles from the pin joint O: - A force of 5 kN is acting in the negative y-direction. - A force of 6 kN is acting in the positive x-direction. - A force of 7 kN is acting at an angle of 30° below the negative x-axis. - An unknown force \( F_1 \) is acting at an angle θ below the positive x-axis. The diagram also depicts an xy-coordinate system with the origin at the pin joint O. #### Steps to Solve: 1. **Resolve All Forces into Components:** - For the 5 kN force: only the y-component. - For the 6 kN force: only the x-component. - For the 7 kN force: both x and y-components. - For the unknown force \( F_1 \): dependent on the angle θ. 2. **Apply Equilibrium Conditions:** - Sum of all horizontal forces must be zero. - Sum of all vertical forces must be zero. 3. **Equations Derived:** - ΣF_x = 0 (Total horizontal forces must balance) - ΣF_y = 0 (Total vertical forces must balance) #### Inputs for Solution: - **Angle and Forces:** - \( F_x = F_1 \cos(θ) - 6 kN + 7\cos(30°) kN = 0 \) - \( F_y = F_1 \sin(θ) - 5 kN - 7\sin(30°) kN = 0 \) **After solving these equations, the magnitude of \( F_1 \) and its angle θ can be determined.** #### Answer Submission Your answer: [text box for student's answer] --- **Notes:** 1. Never submit passwords through Google Forms. 2. This form was created inside the University of Mosul. Report Abuse. --- By understanding and solving such equilibrium problems, it helps in designing stable and efficient truss structures for various engineering applications.
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