7/25/2019 Footing Design Lifting

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VIKRAM UDYOGPURI LIMITED, UJJAIN, MADHYA PRADESH SPML - OM METALS (JV)

9.3 Design of Footing as beam for Lifting case:

0.10

0.5125 0.25 0.5125

Precast footing at the time of lifting will behave as simply supported beam subjected to its self weight

Concrete grade of column = 20 Mpa

Consider the age of concrete at the time of lifting as = 7 Days

Consider Strength of concrete at 7 Days is 60% = 12 Mpa

Reinforcing steel grade = 500 Mpa

Width of Footing is = 925 mm

Depth of footing is middle portion = = 100 mm

Depth of footing at edge portion = = 400 mm

Udl (kN/m) 9.25 2.31 9.25

1.075

action (kN) 5.03 5.03

Maximum Bending Moment = = 0.82 kNm

Maximum Shear Force = = 5.03 kN

Ultimate Bending Moment Mu = = 1.23 kNm

Ultimate Shear Force Vu = = 7.545 kN

Depth at Maximum Bending Moment = = 100 mm

Clear cover to reinforcement = = 50 mm

Effective depth = 45 mm

Mbal = 0.133*fck*b*d^2 = 2.99 kNm

Ast required = 0.5 fck / fy x (1-sqrt(1-(4.6 Mu/ fck b d2

))) b d = 67 mm2

Provided reinforcement is Y 10 Dia @ 200 in Width 925 mm = 363 mm2

Safe

Shear stress due to shear force v = ( 7.545 x 1000) / (925 x (400 - 50 - 5) )= 0.024 N/mm2

Shear capacity of concrete (Pt = 0.114%) c = 0.28 N/mm2

Safe

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