One Way Roof Slab Design

L ln h 2 h 2 ln h h depth of slab and l c c distance between supports.

One way roof slab design.

In other words the one way slab is supported by beams in such a way that the load is carried along one direction. Normal weight aggregate concrete is specified with a density of 145 pcf. One way slabs transfer the imposed loads in one direction only. Longer span l shorter span b 2.

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

Longer span shorter span 2. H min for the slab is different compared with the beams. They may be supported on two opposite sides only fig. Examples of one way slab.

Design a one way slab for the inside of a building using the span loads and other data given in figure 1. Calculate aspect ratio and determine either it is one way or two way slab. 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. However main reinforcement bar and distribution bar in transverse direction.

Under the action of loads it is deflected in the short direction only in a cylindrical form. One way slab design steps. 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. 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.

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. 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. L effective span lesser of the following.