The structure in Fig, 2 is statically indeterminate. We can solve to obtain ll t

Question

The structure in Fig, 2 is statically indeterminate. We can solve to obtain ll the reaction forces (at least with what we have been taught so far). We have managed to plug the structure into a computer program (able to solve statically indeterminate structures), which uses the same sign convention (for N, V and M) as the one in our class. For point E, the program gives a compressive axial force of 5 kip, a positive shear force of 10 kip (positive according to our sign convention) and a positive bending moment of 100 kip ft. Is there a way to check the computer's calculations? Would you recommend this program to a friend? 10 ft 10 kip 20 ft Fiqure2

Explanation / Answer

The results given by the program are incorrect. If we cut a section at E and cosider section EC, then there is no axial l load acting in the section. Therefore, axial load at E should be 0. However,the program gives 5 kips as the result. Also, the bending moment at E is 100kip-ft hogging. According to sign convenstions ,hogging moment is considered negative. Therefore in bending moment ,the program is not considering proper sign convention,even though the magnitude is correct.

I would not recommend this progam to a friend.

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