Structure Engineering notes for GATE and PSUs - part 3

Hello, How you doing? Here is another post for the preparation of GATE and PSUs exams.

• The fineness modulus of fine aggregates is in the range of 2.0 to 3.5
• 1% of voids in concrete mix would reduce its strength by about 5%.
• Poisson's ratio for concrete increases with richer mixes
• Finer grading of cement only effects the early strength of the concrete.
• Factor of safety for steel should be based on its yield strength and that of concrete, on its ultimate strength.
• The factor of safety for concrete is more than that for steel.
• For a reinforced concrete section, the shape of shear stress diagram is parabolic above the neutral axis and rectangular below the neutral axis.
• If a beam fails in bond, then its bond strength can be increased most economically by using thinner bars but more in number.
• If nominal shear Tv exceeds the design shear strength of concrete Tc,  the nominal shear reinforcement as per IS:456:1978 shall be provided for carrying a shear stress equal to Tv-Tc.
• Diagonal tension in a beam increases below the neutral axis and decreases above the neutral axis.
• The individual variation between test strength of sample should not be more than +-15% of average. 
• According to IS:456:1978 the minimum grade of concrete to be used for RCC is M15.
• Modulus of elasticity for steel as per IS:456:1978 is 200 KN/mm2.
• Maximum quantity of water needed per 50 kg of cement for M15 grade of concrete is 32 Liters.
• In case of hand mixing of concrete, the extra cement to be added is 10%.
• For walls, columns and all other vertical faces of structural member, the form work is generally removed after 24 hours to 48 hours.
• If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis then the beam is called over-reinforced beam.

Thanks for visit!

Note: Please leave a comment if you want some specific type of post.