Question

PERHAPS IF YOU USE THE METHOD OF SECTIONS, YOU WON'T BE LATE FOR YOUR NEXT DATE. WHY DON'T YOU START BY FINDING THE FORCES IN MEMBERS EF, JK, AND HJ FOR THE TRUSS BELOW. BE FIC II I j ' D II 2KN BIN SKN 4KN BKN

Answer 1

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consider section 1 -1 cutting the members EF FJ & JK

w 4m 4m i 4mg 3 KN 5 KN 2 KN 2m

In traingle JHK

0 = tan ?(2/2) O= 45°

Taking moment about 8*12-2*8-3*4-Fe=0 Solving Fer=8.5 KN COMPRESSIVE V = 0 8-2-3-5+F]K* sin 45=0 Solving Fyx=2.828 KN |TENSILE EH=0 -FjH+FK* cos45=0 -FjH+2.828* cos 45=0 Solving FJH=2 KN COMPRESSIVE