DESIGN OF PIER BEAM

Slab foundations typically are inexpensive, can be built quickly and are made from reinforced concrete. A home with a slab foundation does not have a basement. A pier and beam foundation usually includes a crawl space beneath the living space and footings to support the foundation.

DATA:

Length  = 9.5m

Breadth = 1.5m

Depth    = 1.5m

= 20 N/

= 415 N/

Cover    = 40mm

 

ANALYSIS:

DL of super structure  = 2140 kN (including bearings)

Self weight of beam    = 384.75 kN

Design load = DL/2+LL

= (2140 +384.75)/2+(0.382700) = 1529.78 kN

Maximum moment on pier beam               = 1529.783.75

= 5736.68 kN.m

Maximum moment including impact load =  1.15736.68

= 6310.34 kN.m

Shear force =1529.78 kN

 

DESIGN:

= 6310.341.5 = 9465.51 kN

= 15291.5      = 2293.5kN

= 0.87d(1-()/bd)

9465.51 = 0.874151500

=21762.98

Provide 25 nos of 32mm diameter rod

And provide 8 nos of 32mm diameter rod at compression zone

 

SHEAR REINFORCEMENT:

CHECK FOR SHEAR:

Shear stress = ()

= (2293.5/15001450)

= 1.02 N/

= (100)/(15001450)                  ( area of steel used 20107

= 0.89

Therefore = 0.7 <

Hence shear reinforcement is required

= ()

= 2293.5-(0.7)

= 718.5 kN

Using 12mm diameter rod ,4 legged stirrups

= 0.87d/)

= 0.874151450/718.5

= 341mm

Adopt 12mm diameter rod, 4 legged stirrups @200 mm c/c

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