Tension in System: 4.22 kN | Working Explained

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Homework Help Overview

The discussion revolves around finding the tension in member CD of a structural system, with a given answer of 4.22 kN. Participants are examining the clarity of the problem setup, particularly the diagram and the relationships between various members of the frame.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Some participants express uncertainty about the existence of tension in member CD, while others question the clarity of the diagram and the definitions of various distances and points in the system. There are attempts to clarify the problem setup and the requirements for calculating tensions in other members, AD and BD.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the diagram and the problem statement. Some guidance has been offered regarding the need for clearer descriptions and interpretations of the setup, but no consensus has been reached regarding the calculations or the existence of tension in CD.

Contextual Notes

Participants note that the diagram is unclear and that there is a lack of verbal description accompanying it. The problem requires determining the load in each member of the frame, which adds to the complexity of the discussion.

goldfish9776
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Homework Statement


I was asked to find the tension in CD in this question . The ans given is 4.22kN.
my working is arc tan (surd 13)/12, tetha = 16.7 degree
CD cos (16.7) = 20kN
CD= 21kN.
p/s: i have used pythagora's theorem to fe the surd 13

Homework Equations

The Attempt at a Solution

 

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I don't think there can be tension in member CD.
 
goldfish9776 said:

Homework Statement


I was asked to find the tension in CD in this question . The ans given is 4.22kN.
my working is arc tan (surd 13)/12, tetha = 16.7 degree
CD cos (16.7) = 20kN
CD= 21kN.
p/s: i have used pythagora's theorem to fe the surd 13

Homework Equations

The Attempt at a Solution

The diagram is very unclear. I'm not sure what the various distances refer to, or where the A and B points are in space. Is there a verbal description that goes with it?
 
paisiello2 said:
I don't think there can be tension in member CD.
actually I'm asked to find tension in CD, AD , and BD. I've found Cd only . I have no idea at all for AD and BD
 
haruspex said:
The diagram is very unclear. I'm not sure what the various distances refer to, or where the A and B points are in space. Is there a verbal description that goes with it?
the book stated ' determine the load in each member of the frame shown in Figure .'
 
goldfish9776 said:
the book stated ' determine the load in each member of the frame shown in Figure .'
Well, I cannot interpret the diagram. If it is clear to you, please explain your interpretation ( provide co-ordinates for each of the points).
 

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