Desing example of Ribbed Slab

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Desing example of Ribbed Slab Powered By Docstoc
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DESIGN OF RIB SLAB                    RS4




                                            B2                                              D1= 10

                                                                                            D2= 60

                                            B1

                                                     120    cms

      B1=       20      Cms                 D1= 10          span =   12             mtrs.
      B2=       20      Cms                 D2= 60          Depth D= 70             cms.

DEAD LOADS :
Weight of topping :             2.5 Kn/sq.mt              live loads on floor           2       Kn/sq.mtr
Weight of ribs        :         2.5 Kn/sq.mt           Workg.load of slab =             7       Kn/sq.mt
Weight of floor finish :      2     Kn/sq.mt           Wt of partition walls =          2       Kn/sq.mt
            Total D.L.=           7 Kn/sq.mt           TOTAL LOADS (W) =                9       Kn/sq.mt


Ultimt. loads on slab=         15.8 Kn/sq.mt
Ultimt. loads per rib=        18.96 Kn/mt

       rs4            12 mts span
                                                                Fck=      30        N/sq.mm
                                                                 Fy=      450       N/sq.mm
Ult.B.M.=      341.28 t-mtr.                                  cover =     35        mm
                                                                  b=      200       mm
Mu/bd2 = 3.858669                                                 d=      665       mm
tensile steel
% of steel required =   1.20436                             % of comp.st.reqd .=    -
Area of steel reqd. = 1601.798 sq.mm                        comp.steel required=    -
Area of steel provd. = 1964.313 sq.mm                       comp.steel provided=    628.58
                     2 of dia 25                                            2 dia   20
         &           2 of dia 25

Check for deflection :

actual Leff/depth =        18.04511
allowable:                                   fs= 229.3453         Pc= 0.472617
allowable Leff/d =         22.35138          Mt= 0.98369          Mc= 1.136098

				
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Description: This is a simple example of Design of Ribbed Slab which is now a day very common in Urban areas like tall towers etc.