تصميم Two Way Ribbed Slab

Under the action of loads it is deflected in the.

تصميم two way ribbed slab. Concrete ribs or joists the ribs are usually tapered and uniformly spaced and supported on girders that rest on columns. For uniformly distributed loads of w per square foot of the slab each strip acts approximately like a simple beam uniformly loaded by its share of w. Design of reinforced concrete structures ii two way slabs 1 1. Total load is carried in the direction perpendicular to the supporting beam.

Check the applicable joist dimensional limitations as follows. If a slab is supported on all the four sides but the ratio of longer span l to shorten span b is greater than 2 then the slab will be considered as one way slab. 3 2 2 one way joist floor system. Inroduction when the ratio l s is less than 2 0 slab is called two way slab as shown in the fig.

I e w a and w b. However main reinforcement bar and distribution bar in transverse direction. A slab supported on four sides with length to width ratio greater than two should be designed as one way slab. Civil online 8 029 views.

In this example the latter option will be used to achieve better understanding for the design of two way joist slab often called two way ribbed slab or waffle slab. 1 1 b shows two center strips of a rectangular plate with spans l a and l b. Bending will take place in the two directions in a dish like form. One way slab is supported on two opposite side only thus structural action is only at one direction.

Distribute moments transverse at critical sections to column and middle strip and if. Transferred to supporting beams and columns slabs are classified into two types. 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. Two way ribbed slab waffle slab bilal alzubaidi civil online.

Ddm method examples and shear for two way solid slabs duration. Slideshare uses cookies to improve functionality and performance and to provide you with relevant advertising. The load on the slab is carried by the short span in one direction. The basic design procedure of a two way slab system has five steps.

This type of slab also called ribbed slab is supported by reinforced. What is one way slab. Determine moments at critical sections in each direction normally the negative moments at supports and positive moment near mid span. 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.