The top and bottom chord of the long truss shown below are CHS sections, and each has I = 31x10

^{6}mm^{4}and A = 6300 mm^{2}. Take E_{steel}= 200 GPa. All members have the same length of 1m. Determine the approximate deflection at mid-span.The correct answer is 26mm. The truss can be approximated to a beam. The second moment of Area of the 'beam' can be determined using parallel axis theorem allowing standard beam deflection equations applied for an approximate answer.

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