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W1=2kN h20cm C W2=20kN l=6mEI=12.2104kN-m2
m =W1W2 / 2/ g 1224 kg = l3 / (48EI) 0.37104 m / kN
v = = 1.98 m/s v0= vW1 /W1W2/2= 0.33m/s y0 = Fw1 = 0.74104m ymax = = 22.2 104m FPe= ymax / = 60kN
20cm 30 3m 1/5 6 630 1000