Definition of Concrete Process of mixing broken Granite metal or broken bricks with mortar in correct proportion is called concrete.This granite broken metal or broken brick is called coarse aggregate. Jelly denotes coarse aggregates only. It diggers from fine aggregate.The mortar may be cement sand or lime sand which is mixed with concrete when rod … Read more
Q.Design a RC rectangular beam simply supported over an effective span of 6 m to support an imposed load of 24 kN/m inclusive of its self weight. Use M 25 grade concrete and Fe 415 steel. Provide width of the beam equal to half of the depth. Use working stress method SOLUTION: Effective span l … Read more
Q.Design a RC rectangular beam simply supported over an effective span of 5m to support an imposed load of 20 kN/m inclusive of its self weight. Adopt M 20 grade concrete and Fe 415 steel. Provide effective depth 1.5 times the width. Use Working stress method SOLUTION: Effective span l = 5m Working load w … Read more
Q.Design a rectangular R.C.C beam to resist a bending moment of 65 kN-m. Use M 20 grade concrete and Fe 415 steel. Assume b = 0.5d SOLUTION: 1. PERMISSIBLE STRESSES σcbc =7N/mm ² σst = 230 N / mm ² 2. … Read more
Q. Design a R.C.C beam 230 mm wide to resist a bending moment of 30 kN-m. Use M 20 grade concrete and Fe 415 steel. SOLUTION: 1. PERMISSIBLE STRESSES σcbc =7N/mm ² σst = 230 N / mm ² 2. DESIGN … Read more
Q.An R.C. beam 200 mm wide and 500 mm deep effective is reinforced with 3 nos. of 16 mm dia bars. Find the moment of resistance of the beam by using working stress method. Concrete grade M20 and mild steel reinforcement are used. SOLUTION: WIDTH b= 200mm EFFECTIVE DEPTH d = 500 mm AREA OF … Read more
Q.A reinforced concrete beam 300 mm x 600 mm overall depth is reinforced with 4 bars of 20mm diameter at an effective 600 over what uniformly distributed load this beam can carry excluding self weight, over a simply supported span of 5 m. Assume M 25 grade concrete and Fe 415 steel. Use working stress … Read more
Q. reinforced concrete beam 230 mm wide by 500 mm overall depth is reinforced with 4 bars of 12 mm diameter at an effective cover of 50 mm. Using M 20 grade concrete and Fe 415 steel, estimate the moment of resistance of the section. If the beam is simply supported over an effective span … Read more
Q. A reinforced concrete beam 250 mm wide by 475 mm overall depth is reinforced with 3 bars of 16mm diameter at an effective cover of 50 mm. Using M 20 grade concrete and Fe 415 steel, find the depth of neutral axis. SOLUTION: WIDTH b= 250mm EFFECTIVE DEPTH d = 475 – 50 = … Read more
ANALYSIS OF SINGLY REINFORCED SECTIONS If the reinforced bars are provided only on tension side in the beam section, it is called as singly reinforced beams. Consider a simply supported beam subjected to bending under working loads. Since plane sections are assumed to remain plane after bending, strain is proportional to distance from the neutral … Read more