4/9 Determine the force in each member of the loaded truss. Make use of the symmetry of the truss and of the loading. B C D E 5 m A 4 m H 30 kN 5 m 5 m G 60 KN PROBLEM 4/9 F 30 kN 5 m
4/9 Determine the force in each member of the loaded truss. Make use of the symmetry of the truss and of the loading. B C D E 5 m A 4 m H 30 kN 5 m 5 m G 60 KN PROBLEM 4/9 F 30 kN 5 m
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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
Transcribed Image Text:**Problem 4/9:**
**Determine the force in each member of the loaded truss. Make use of the symmetry of the truss and of the loading.**
### Diagram Explanation:
The diagram depicts a truss structure with several members connected at various joints. The truss spans horizontally and is influenced by vertical forces at specific points.
- The truss has five joints labeled A, B, C, D, and E.
- The horizontal distances between each joint are measured as follows: AB = 5 m, BC = 5 m, CD = 5 m, and DE = 5 m.
- There are three vertical members labeled BH, CG, and DF, each with a height of 4 m.
- Three vertical forces act downward at points H, G, and F:
- At H: 30 kN
- At G: 60 kN
- At F: 30 kN
### Symmetry in Truss:
The truss is symmetric about the center vertical line through joint G. This implies that the forces in members BH and DF as well as in members AB and DE are equal. Similarly, the forces in members BC and CD are symmetrically equal due to the loading conditions and the geometry of the truss.
### Points to Note:
- Point A is fixed (represented with a triangle), which likely means it is a pinned support that can resist both horizontal and vertical forces but not a moment.
- Point E is on a roller support (represented with a circle), indicating it can resist vertical forces but allow horizontal movement.
The determination of the forces typically involves using methods such as the method of joints or the method of sections, leveraging the symmetry to simplify calculations.
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