Section A
Q1.
(a) Determine the horizontal and vertical components of force which the pin at 'C' exerts on member BC of the frame in Figure 1(a).
(b) A close-coiled helical spring is to have a stiffness of 900 N/m in compression, with a maximum load of 45 N and a maximum shearing stress of 120 N/mm2. The solid length of the spring (i.e. coils touching) is 45 mm. Find the wire diameter, mean coil radius, and number of coils. G = 40,000 N/mm2.
(c) A three hinged parabolic arch of 20 m span and 5 m rise is carrying a uniformly distributed load of 50 kN/m in the half portion as shown in Figure 1(c). Calculate the value of maximum horizontal thrust.