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.
One way roof slab design. However main reinforcement bar and distribution bar in transverse direction. One way slab design steps. Under the action of loads it is deflected in the short direction only in a cylindrical form. The load on the slab is carried by the short span in one direction.
L ln h 2 h 2 ln h h depth of slab and l c c distance between supports. Calculate aspect ratio and determine either it is one way or two way slab. L effective span lesser of the following. Calculate the effective span of slab from is 456 clause 22 2 which is least of.
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. Longer span shorter span 2. 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. H min for the slab is different compared with the beams.
One way slabs transfer the imposed loads in one direction only. Determine the minimum thickness of slab from serviceability criteria of deflection control. They may be supported on two opposite sides only fig. 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. Longer span l shorter span b 2. 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. 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.
Normal weight aggregate concrete is specified with a density of 145 pcf. One way slab and two way slab. Design a one way slab for the inside of a building using the span loads and other data given in figure 1.