If the slab's shear strength is less than ultimate shear imposed on the slab, then required strategies shall be considered to tackle the problem. Slab thickness to withstand shear force is as follows:
#300MM X 1500MM CONCRETE SLAB CRACK REPAIR CODE#
The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations. The slab thickness chosen must be adequate for shear at both interior and exterior columns. To see the details of computing minimum slab thickness, please click here.
This method is applicable for different types of two-way slabs such as flat slab, flat plate, slabs on beams, slabs without interior beams. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. Generally, the slab thickness is chosen to prevent excessive deflection in service. Similar to the one-way slab, the thickness of two-way slab should satisfy deflection and shear requirements. Lastly, slab thicknesses are usually rounded off to the nearest 10mm. The temperature of the unexposed surface to rise by a given amount, generally 121.1Cįor a 121.1C (250☏) temperature rise, a 76.2 mm (3-1/2 inch) thick slab gives a 1-hour fire rating, a 127mm (5-in) slab offers a 2-hour fire rating, and a 152.4mm (6-1/4 inch) slab provides a 3-hour fire rating. This criterion the fire rating of a floor is the number of hours necessary for Thicknesses are controlled by the danger of heat transmission during fire. Since slabs rarely require reinforcement ratio greater than 0.01, check whether selected slab thickness is adequate for reinforcement ratio of 0.01.Compute moments using suitable methods such as ACI Coefficient Method.
#300MM X 1500MM CONCRETE SLAB CRACK REPAIR TRIAL#
Bending and Shear Requirementsĭetermination of slab thickness based on bending and shear These values can be used provided the slabs are not supporting or attached to partitions or other structures liable to be damaged by large deflections. Supported slabs L/24 for slabs with one end continuous L/28 for slabs with bothĮnds continuous and L/10 for cantilevers where L is the span. Otherwise, thickness of one-way slabs must be at least L/20 for simply The ACI Code sets limitations on slab thickness Soil, the slab thickness is selected based on deflection requirements. Deflection Requirementsįrom slabs that are loaded heavily for instance slabs carry several meters of The thickness of one-way slab is based on Deflection, Bending, Shear, and occasionally Fire resistance requirements.
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