A. Member AB of the portal frame in Prob. 17.7 is subjected/ to a temperature drop of 30°C….

A. Member AB of the portal frame in Prob. 17.7 is subjected/ to a temperature drop of 30°C. Determine forces in members, a c = 8.25 X 10–6°C.   B. Analyse the pin-connected truss shown in Fig. 17.26 for applied load P. All members are of equal stiffness EA.   C. The truss shown in Fig. 17.27 has top and bottom chords area = 650 mm2, verticals = 325 mm2 and diagonals = 975 mm , E = 200 kN/mm2 (200,000 MPa). An analysis is required for the loading and fabrication defects described below. (a) Define an approriate primary structure. (b) Obtain flexibility matrix FI. (c)
A. Member AB of the portal frame in Prob. 17.7 is subjected/ to a temperature drop of 30°C. Determine forces in members, a c = 8.25 X 10–6°C.   B. Analyse the pin-connected truss shown in Fig. 17.26 for applied load P. All members are of equal stiffness EA.   C. The truss shown in Fig. 17.27 has top and bottom chords area = 650 mm2, verticals = 325 mm2 and diagonals = 975 mm , E = 200 kN/mm2 (200,000 MPa). An analysis is required for the loading and fabrication defects described below. (a) Define an approriate primary structure. (b) Obtain flexibility matrix FI. (c) Analyse the structure for a concentrated load of 50 kN applied downwards at joint 4. (d) For the unloaded truss, fi nd the bar forces resulting from a fabrication error in which bars 1-4 and 3-5 were fabricated 8.33 mm longer than required.