Structure Engineering notes for GATE and PSUs - part 7

Hello there,
How have you been? Here is our next part for your preparation of GATE and PSUs examinations.

• A linear arch has normal thrust only, no shear force and no bending moment.
• A three hinged parabolic arch containing uniformly distributed load is free from the bending moment and shear force.
• For a determinate pin jointed plane frame, the relation between the number of joints j and members m is given by,  m=2j-3.
• Triangle is a basic perfect frame.
• Method of joints is applicable only when the number of unknown forces at the joint under consideration is not more than two.
• A hollow shaft will transmit more power than a solid shaft of same weight and material.
• The stiffness of a helical spring is expressed as load per unit deflection.
• If a rectangular shaft is subjected to torsion, the maximum shear stress occurs at middle of the longer side.
• If a circular shaft is subjected to a torque T and bending moment M, the ratio of maximum bending stress and maximum shear stress is  2M/T.
• The radius of gyration of a circle of radius R is equal to  R/2.
• The ratio of intensity of stress in case of a suddenly applied load to that in case of a gradually applied load is 1.

Thanks for joining in!

Reference: Google & A book "Civil Engineering Objective" by S P Gupta and S P Gupta.