Truss-Member Forces- Method of sections

  • Thread starter Thread starter twenty5
  • Start date Start date
  • Tags Tags
    Forces Method
AI Thread Summary
The discussion focuses on calculating member forces in a truss using the method of sections, with the user seeking validation for their results. They have calculated several forces, including both tension and compression values, but are finding the numbers increasingly complex. The user mentions a program called "Truss Analysis Module" that their colleagues use for verification, which is reportedly free. They express urgency due to an impending deadline and share their current calculations for peer review. The conversation highlights the challenges of truss analysis and the need for accurate verification of results.
twenty5
Messages
93
Reaction score
0

Homework Statement


Calculate the truss' member forces using method of sections.


Homework Equations


Fx=0
Fy=0
M (any point) = 0

[PLAIN]http://img97.imageshack.us/img97/4482/haalp.png

The Attempt at a Solution


I have half of it done, but the numbers are beginning to get outrageously rediculous... I just want to double check the numbers with someone... my colleagues at school have a program "Truss Analysis Module" program that can calculate the forces on the members and show whether it is in tension or compression. Does anyone know what program this is? It is a free one apparently T_T


Anyways, I just want to double check with the values I currently got

a = 36.457kN ( Compression )
f = 84.562kN ( Compression )
e = 72.096kN ( Tension )
b = 109.878kN (Tension)
g = 74.837kN ( Compression )

I started from the very left side of the truss

It's due tomorrow :( really tough week with all the exams and tests T_T
 
Last edited by a moderator:
Physics news on Phys.org
I'm starting to come in from the right end, and it's starting to match up.. I think I'm doing it correctly ^^. I like to talk to myself thanks guys.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top