Statics Truss Problem, Stuck at force in one member. Please help

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SUMMARY

The discussion focuses on solving a statics truss problem involving member BD, where the user struggles with too many unknowns. Key equations used include Ʃm=0, Ʃfx=0, and Ʃfy=0. The recommended approach is to apply the method of joints, solving for joints in the order ABCDE, which simplifies the problem by ensuring only two unknowns per joint. This method avoids the complexity of moment equations, making it easier to find the forces in the truss members.

PREREQUISITES
  • Understanding of static equilibrium equations: Ʃm=0, Ʃfx=0, Ʃfy=0
  • Familiarity with truss analysis techniques, specifically the method of joints
  • Ability to create and interpret Free Body Diagrams (FBDs)
  • Knowledge of geometry to determine angles in truss members
NEXT STEPS
  • Study the method of joints in truss analysis
  • Learn how to effectively create and analyze Free Body Diagrams (FBDs)
  • Explore the method of sections for solving truss problems
  • Practice solving statics problems involving multiple unknowns
USEFUL FOR

Students studying structural engineering, civil engineering students, and anyone involved in statics and truss analysis who seeks to improve their problem-solving skills in mechanics.

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Homework Statement


Figured it would be easier if I showed a picture

http://img210.imageshack.us/img210/707/problemcz.jpg


Homework Equations


Ʃm=0
Ʃfx=0
Ʃfy=0

The Attempt at a Solution



Here is my attempted solution, I am missing member BD and not sure which way to solve it, I tried sectioning it again and it provides too many unknowns. I tried taking a FBD at joint B and D but again too many unknowns.
Any suggestions on which way to go?
Thanks!
http://img804.imageshack.us/img804/12/photo2sw.jpg
 
Last edited by a moderator:
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After solving for reactions and determining angles you should cut a section thru BD and sum moments about the left support. You may have done this but I can't read your calcs from this I phone tiny screen.
 
If you solve the joints in order ABCDE, then, in each case, there are just two unknowns to solve for. This is the method of joints which is a subset of the method of sections in which no moment equations are used.
 

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