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ANSWER :Given that :A load P is supported by a structure consisting of a rigid barBDF and three identical 15 mm diameter steel(E=200 GPa) rods,(1)Heregiven that{:[a=1.8m.quad epsilon=2006PPa=200 xx10^(3)N^(mm^(2).)],[b=1.2m.]:}L=2.2m". "for a load of P=61kN=>61 xx10^(3)N.{:[sum fy=0],[F_(B)+F_(D)+F_(F)-P=0=>F_(B)+F_(D)+F_(F)=61000N],[SigmaM_(B)=0uarr],[-p xx b+F_(D)xx a+F_(F)xx2a=0^(@)],[1.8F_(D)+3.6F_(F)=73200 rarr(2)]:}(2)In displacement triangle rarr{:[(delta_(B)-delta_(F))/(BF)=(delta_(D)-delta_(F))/(D_(F))],[(((F_(B)L)/(AF_(2))-(F_(F)L)/(AF)))/(2a)=(((F_(D)xx L)/(AE)-(F_(F)L)/(AE)))/(a)],[(F_(B)-F_(F))/(2)=F_(D)-F_(F)],[F_(B)-2F_(D)+F_(F)=0]:}By solving eqn (1) and ... See the full answer