2. All members of the truss A B C shown have a cross- sectional area of 500 mm? and all pins have a diameter of 20mm. Determine: 2 m (a) The axial stresses in members BC and DE F E D (b) The shear stresses in the pin at A, assuming the pin is in double shear -2 m 2 m 2 m- P = 21 kNY

Using the method of joints, determine the force in each member of the roof truss shown. Take the load P = 1.4 kN. (Round the final answers to a single decimal place.) 6 m- 2.4 kN B 9 m 6 m 2.4 kN O 6 m 9 m The force in member DF (FDF) is 0. The force in member EF (FEF) is The force in member AB (FAB) is The force in member AC (FAC) is The force in member BC (FBC) is The force in member BD (FBD) is The force in member CD (FCD) is The force in member CE (FCE) is The force in member DE (FDE) is P 7.5 m kN. (Compression) kN. (Compression) KN. (Tension) kN. (Compression) kN. (Compression) kN. (Tension) kN. (Tension) kN. (Compression)

The rigid element BCD is supported by a bar AB with a diameter of 25 mm and a connection at C with a diameter of 10 mm. Determine:a. The normal stress in bar AB. b. The shear stress of the bolt at C.

10. The rigid bar below is supported by axial bar (1) and by a pin connection at C. Axial bar (1) has a cross-sectional area of A₁ = 275 mm², an elastic modulus of E = 200 GPa, and a coefficient of thermal expansion of a = 11.9x 106/°C. The pin at C has a diameter of 30 mm. After load P has been applied and the temperature of the entire assembly has been increased by 31°C, the total strain in bar (1) is measured as 975 μe (elongation). Determine: (a) the magnitude of load P. (b) the shear stress in pin C. 275 mm Connection detail (1) Rigid bar 540 mm 135 mm 260 mm