Structure Engineering notes for GATE and PSUs - part 9

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

• Strain Energy stored in a member is given by 0.5*Stress*Strain*Volume
• Two identical bars, one simply supported and other fixed at ends, are acted upon by equal loads applied at the midpoints. The ratio of strain energy stored in the simply supported beam and the fixed ended beam is 4.
• If the depth of a beam of rectangular section is reduced to half, strain energy stored in the beam becomes 8 times.
• The specimen in a Charpy impact test is supported as a simply supported beam.
• Impact test enables one to estimate the property of toughness.
• The phenomenon of decreased resistance of a material to reversal of stress is called fatigue.
• The stress below which a material has a high probability of not failing under reversal of stress is known as endurance limit.
• A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered at segmental without changing the other details, the horizontal thrust will decrease definitely.
• For ductile materials, the most appropriate failure theory is maximum shear stress theory.
• For the design of a cast iron member, the most appropriate theory of failure is Rankine's theory.
• Principal plane in a uni-dimensional stress system is defined as the plane where Shear stress is zero and normal stress is maximum.
• If an element is subjected to pure shearing stress t, the maximum principal stress is equal to t.

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