Trusses (forces)

  • Thread starter chetzread
  • Start date
  • #1
chetzread
801
1
1.)
from the calculation of F(AD), the force should point towards A,right? (red arrow)
but, in the calculation of F(AB), the (1/sqrt rt2)(48.08) should be positive,right? (which is pointing towards LEFT)???
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2. Homework Equations



The Attempt at a Solution


this involve the resolution of forces into vertical and horizontal axes,am i right?
 

Answers and Replies

  • #2
billy_joule
Science Advisor
1,200
331
1.)
from the calculation of F(AD), the force should point towards A,right? (red arrow)
but, in the calculation of F(AB), the (1/sqrt rt2)(48.08) should be positive,right? (which is pointing towards LEFT)???
Positive X is rightward, as the equation HA -28 = 0 defined at the start of the solution.
Member AD was found to be in compression and so exerts a leftward force at joint A, so the term 1/(√2)(48.08) is negative.
 

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