One Way Roof Slab Design

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

One way roof slab design.

Design a one way slab for the inside of a building using the span loads and other data given in figure 1. In other words the one way slab is supported by beams in such a way that the load is carried along one direction. Examples of one way slab. One way slab design steps.

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. 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. 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.

Calculate the effective span of slab from is 456 clause 22 2 which is least of. The load on the slab is carried by the short span in one direction. One way slab and two way slab. 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.

However main reinforcement bar and distribution bar in transverse direction. H min for the slab is different compared with the beams. Determine the minimum thickness of slab from serviceability criteria of deflection control. L effective span lesser of the following.

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. Calculate aspect ratio and determine either it is one way or two way slab. Longer span l shorter span b 2. L ln h 2 h 2 ln h h depth of slab and l c c distance between supports.

Normal weight aggregate concrete is specified with a density of 145 pcf. 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.