One Way Roof Slab Design

One way slab and two way slab.

One way roof slab design.

The slab has to carry a distributed permanent action of 1 0 kn m2 excluding slab self weight and a variable action of 3 0 kn m2. L ln h 2 h 2 ln h h depth of slab and l c c distance between supports. Assuming cover 3 4 in figure 1 the minimum thickness for one way slab simply supported l 20 using table 1 aci 9 5 2 1. However main reinforcement bar and distribution bar in transverse direction.

Calculate the effective span of slab from is 456 clause 22 2 which is least of. In other words the one way slab is supported by beams in such a way that the load is carried along one direction. One way slab design steps. Examples of one way slab.

Determine the minimum thickness of slab from serviceability criteria of deflection control. One way slab is designed as singly reinforced rectangular section. Longer span shorter span 2. When the ratio of the longer to the shorter side l s of the slab is at least equal to 2 0 it is called one way slab shown in figure 8 1 a.

The load on the slab is carried by the short span in one direction. Design a one way slab for the inside of a building using the span loads and other data given in figure 1. When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two it will be considered as one way slab. L effective span lesser of the following.

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. They may be supported on two opposite sides only fig. Normal weight aggregate concrete is specified with a density of 145 pcf. Under the action of loads it is deflected in the short direction only in a cylindrical form.

H min for the slab is different compared with the beams. 1 1 a in which the structural action is essentially one way the loads being carried in direction perpendicular to the supporting beams or walls. One way slabs transfer the imposed loads in one direction only.