One Way Roof Slab Design

Examples of one way slab.

One way roof slab design.

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. Longer span l shorter span b 2. 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. Under the action of loads it is deflected in the short direction only in a cylindrical form.

Calculate the effective span of slab from is 456 clause 22 2 which is least of. One way slab can be defined as the type of slab in which the ratio of the longer span to the shorter span is greater than two. Longer span shorter span 2. Calculate aspect ratio and determine either it is one way or two way slab.

They may be supported on two opposite sides only fig. L effective span lesser of the following. However main reinforcement bar and distribution bar in transverse direction. H min for the slab is different compared with the beams.

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. One way slab design steps. L ln h 2 h 2 ln h h depth of slab and l c c distance between supports. 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.

Normal weight aggregate concrete is specified with a density of 145 pcf. Determine the minimum thickness of slab from serviceability criteria of deflection control. 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. Design a one way slab for the inside of a building using the span loads and other data given in figure 1.

One way slabs transfer the imposed loads in one direction only. 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 and two way slab.