ONE WAY - TWO WAY SLAB

ONE WAY SLAB :



What is slab ??

      Slabs are constructed to provide flat surfaces, usually horizontal, in building floors,
roofs, bridges, and other types of structures. The slab may be supported by walls,
by reinforced concrete beams usually cast monolithically with the slab, by structural
steel beams, by columns, or by the ground.

       One way slab is a slab which is supported by
beams on the two opposite sides to carry the
load along one direction. The ratio of longer
span (l) to shorter span (b) is equal or greater
than 2, considered as One way slab because
this slab will bend in one direction i.e in the
direction along its shorter span.

       Due to the huge difference in lengths, load is not transferred to the shorter beams.
Main reinforcement is provided in shorter span and distribution reinforcement in
longer span.
Example: Generally all the Cantilevr slabs are one Way slab. Chajjas and
verandahs are an practical example of one way slab. 

TWO WAY SLAB :

       Two way slab is a slab supported by
beams on all the four sides and the
loads are carried by the supports along
both directions.
In two way slab, the ratio of longer span
(l) to shorter span (b) is less than 2.

      In two way slabs, load will be carried in both the directions. So, main
reinforcement are provided in both direction for two way slabs.
Example: These types of slabs are used in constructing floors of multi storied
building.

Difference between One way and Two way Slab :



One Way Slab :                                                                               Two Way Slab :



1) Slabs are supported by the beams on                          1)  Slabs are supported by beams on all the

    the two
opposite sides.                                                      four sides.

                                               

2) Main Reinforcement is provided in                            2)  Main Reinforcement is provided along

    only one
direction for one way slabs.                              both the directions in two way slabs.

                         

3) Loads are carried along one direction                        3) Loads are carried along both the directions

    in one
way slab.                                                             in two way slabs.