Analysis the rigid jointed plane frame

Degree of Static Indeterminancy.

Ds = R-E = 4-3 = 1

Assuming Ds = Number of redundant force R

PortionOriginLimitMxxM1
DCD0-200
BCC0-4-10X²/2 = -5X²+X
BAB0-5-20X – 1042 = -20X-804

Actual displacement at redundant = 0

[ D ] = [ ΔL1 ] + δ11 * R1

0 = – 2920 / EI + 101.33 / EI * R1

R1 = 2920 / 101.33 = 28.21 KN

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