A steel beam supported by three parallel pin-jointed steel rods is shown in the figure. The moment of inertia of the beam is $8 \times 10^7 \mathrm{~mm}^4$. Take modulus of elasticity of steel as 210 GPa . The beam is subjected to uniformly distributed load of $6.25 \mathrm{kN} / \mathrm{m}$, including its self-weight.
The axial force (in kN ) in the centre rod CD is___________ (round off to one decimal place).
Consider the pin-jointed truss shown in the figure. Influence line is drawn for the axial force in the member G-I, when a unit load travels on the bottom chord of the truss. Identify the CORRECT influence line from the following options:
Note: Positive value corresponds to tension and negative value corresponds to compression in the member.
In the pin-jointed truss shown in the figure, the members that carry zero force are identified. Which of the following options is/are zero-force members?
