Roof Slab Reinforcement Design

Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less.

Roof slab reinforcement design.

Simply supported one way slab a rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and 3 75 m apart. However the complexity of the generalized approach. The diameter of bar generally used in slabs are. 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 designed according to one unified method such as direct design method and equivalent frame method.

If reinforced concrete were to be reused strong connections would have to be made between roof and walls. The maximum diameter of bar used in slab should not exceed 1 8 of the total thickness of slab. Such slabs left unconnected to walls caused many deaths in the 2005 quake from school roof collapses. Reinforcement projecting from the concrete or masonry walls is bent to the slope of the roof and lapped with the roof s rebar to pro vide secure anchorage.

Determine the dead load that is acting on the slab. Reinforced concrete slabs are heavier and generate higher seismic forces in an event. Find the effective span which is lesser of i distance between centres of bearings and ii clear span and effective depth. Steps to be followed in the design of slab assuming suitable bearings not less than 10cm find the span of the slab between the centers of bearings.

Thickness of the slab is decided based on span to depth ratio specified in is456 2000. Flexural reinforcement must be greater than 0 0018 psi or the shrinkage reinforcement. Should not be less than 110 mm for rooms should not be less than 75 mm for sunshades. Identify the type of slab.

Assume the thickness of slab take 4 cm per metre run of the span. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. However including the beams would effectively transfer a load of slabs to the columns which is good for durability of the structure. Minimum reinforcement is 0 12 for hysd bars and 0 15 for mild steel bars.

Determine h min and round it to higher 10mm multiple. The slab has to carry a distributed permanent action of 1 0 kn m2 excluding slab self weight and a variable action of 3. A stiff concrete mix specified at 3000 psi is pumped into place as workers advance up the slope to vi brate and finish the concrete to the desired thickness. This is the design of roof how the reinforcement has been lated over here and how to be the covering lated over is 6 x6 inch and used 10 and 12 mm diameter bars.

Design procedure of one way slab.