Hello friends, RCC is a most important subject of civil engineering. From the exam point of view, RCC is a high scoring subject. Most of the question in RCC is related to Design codes, Limiting values. Is 456:2000 code has a major role in RCC design. That’s why today we post some standard values of reinforced concrete design.
“Every point is most important for RPSC AEN 2018 & SSC JE & GATE 2019, ESE 2019 and other exams related to civil engineering”.
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(1). By over reinforcing a beam, the moment of resistance can be increased not more than 25%.
(2). In limit state design method, As per IS:456-2000 the partial safety for steel is 1.15
(3). The maximum shear stress in a rectangular section of a beam is 1.50 times the average.
(4). According to Indian Standard 456 specifications, the safe diagonal tensile stress for M 150 grade concrete is 5 kg/cm2.
(5). The minimum number of longitudinal bars provided in RCC circular column is 6.
(6). The spacing of stirrups in a rectangular beam is, increased at the center of the beam.
(7). The minimum number of longitudinal bars provided in RCC rectangular column is 4.
(8). Dimensions of a beam need to be changed if the shear stress is more than 20 kg/cm2.
(9). For M 150 grade of concrete, according to I.S.456 specifications, the local bond stress is 10 kg/cm2.
(10). If the diameter of a reinforcement bar is d, the anchorage value of the hook is 16d.
(11). The maximum area of tension reinforcement in beams should not exceed 4%.
(12). The radius of the bar bend to form a hook, should not be less than, twice the diameter.
(13). The length of the lap in a compression member is kept greater than 24 bar diameter.
(14). The length of the straight portion of a bar beyond the end of the hook should be at least, seven times of the diameter.
(15). The maximum permissible size of aggregates to be used in casting the ribs of a slab is 10 mm.
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