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Crank roof slab reinforcement. According to the 1995 aci code all two way reinforced concrete slab systems including edge supported slabs flat slabs and flat plates are to be analyzed and. The full form of rcc is reinforced concrete cement. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less. D1 diameter of smaller bar d2.
The slab should be provided steel bars to withheld tensile force so this slab is called the rcc slab. Simply the slab in which steel bars are used is known as rcc slab. For occasionally heavy loads we adopt 8 and above thickness slabs. First find number of rods required for main reinforcement and distribution.
The rule that is generally practiced is that the slope of crank 1 10 minimum length of crank 300 mm. We generally adopt 6 0 15m slab thickness. Number of required bars formula length of slab spacing 1. Purpose of crank bar.
6 mm 8 mm 10 mm 12mm and 16mm. The diameter of bar generally used in slabs are. To resist negative bending moment hogging. Crank length of reinforcement.
Crank is a slight bending in bars at the lap so that maintains the clear cover even at the lap position. The maximum diameter of bar used in slab should not exceed 1 8 of the total thickness of slab. Crank bars are generally provided. Minimum reinforcement is 0 12 for hysd bars and 0 15 for mild steel bars.
The slab should be strong enough to bear the required load according to design. Steel yield strength fy 40 ksi. Concrete compressive strength fc 3 ksi. When these bars are provided the strength and deformation capacity of slabs with bent up bars compared to slabs without bent up bars is sufficiently increased.
Where reinforcement is called a steel rod. Thickness of the slab is decided based on span to depth ratio specified in is456 2000. Quantity of reinforcement steel required for slab or bar bending schedule for slab in this post i am finding out the estimation of steel reinforcement required for a slab to work on this i considered a plan as shown below. Formula of crank length d1 d2 5 10mm.
Design the roof slab beam and column of house given in figure 1.
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