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Isolated Trapezoidal Footing Design

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Trapezoidal footing design excel file
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  Bar dia. & Bar nos. calculation for AstxBar dia. & Bar nos. calculation for AstspacingspacingB of footing2400Nos. reqd122.907A of footing1900Nos. reqd122.906971 Astx req'd63919Asty req'd63915Diameter of reinf. Tried850.2655955.044Diameter of reinf. Tried850.26548251078.53981492.261078.539816312113.0972148.8512113.09733616201.0623820.1816201.0619320314.1595969.0320314.15926525490.8749326.625490.87385232804.24815280.732804.247719Minimum bar dia req'd.8Minimum bar dia req'd.8Note :- Don't change anything in this sheet   955.0441671492.256512148.849383820.176675969.026049326.6031915280.7067  Design of Footing :-  A Input Data Factored axial load (Pu)1200kNColumn SizeColumn side parallel to x-axis (a)300mmaColumn side parallel to y-axis (b)800mmFooting SizeColumn side parallel to x-axis (A)1900mmbColumn side parallel to y-axis (B)2400mmBxConcrete grade20N/mm²Reinforcement grade415N/mm²Soil Bearing capacity (Working)200kN/m²Depth of footing at column (D) (Provided)450mmyDepth at the edge of slopped footing (d) (Provide200mmPlanEffective cover to reinforcement60mmFooting size is O.K.Reinf. Calculations // to AWeight of footing38kNTotal design load(Limit)1238kN Area required for footing4.13m²DOffset parallel to x-axis800mm AOffset parallel to y-axis800mmUpward soil pressure (Factored)271.49kN/m²SectionMoment at column face parallel to x-axis86.88kN.m / mRequired depth#N/AmmMoment at column face parallel to y-axis86.88kN.m / mRequired depth#N/Amm Reinforcement Reinforcement reqd. - parallel to x-axis (Astx)639mm²/mReinforcement reqd. - parallel to y-axis (Asty)639mm²/mMin. 0.12% Reinforcement-parallel to x-axis (Astx480mm²/mMin. 0.12% Reinforcement-parallel to y-axis (Ast330mm²/mReinforcement provided - parallel to x-axis   (Astx)10@mm c/cReinforcement provided - parallel to y-axis (Astx)10@mm c/c   Check the depth of footing for two-way shear at deff/2 from column face Perimeter at crictical section4000mmEffective depth at critical section329.0625mm Area resisting shear1316250mm² t 1.118N/mm²ks#N/A t #N/AN/mm²Design shear1015.1kN tv 0.771N/mm²#N/A Ckeck for one-way shear at deff. Distance from column face (along x-axis) Effective depth of footing at critical section268.125mmTop width of footing at critical section1580mmCross sectional area of footing at critical section533569mm²Total Shear at critical section267.1kNShear stress (tvx) 0.415N/mm²% reinforcement at critical section0.383%.383 %.442 %122.9122.9- 20 Nos.- 20 Nos.d  A x B 247584675.xls.ms_office\Footing\10/15/2014\2:56 AM  Permissible shear stress (tcx)N/mm²Safe O.K. Ckeck for one-way shear at deff. Distance from column face (along y-axis) Effective depth of footing at critical section268.125mmTop width of footing at critical section1080mmCross sectional area of footing at critical section399506mm²Total Shear at critical section211.5kNShear stress (tvy)0.415N/mm²% reinforcement at critical section0.442%Permissible shear stress (tcy)N/mm²Safe O.K. Check for bearing pressure at column base  Actual bearing stress (Pu / (axb) )5.158333N/mm² A1 ( A x B )4560000mm² A2 ( a x b )240000mm²Permissible bearing stress0.45 x Fck x sqrt(A1/A2) =#N/AN/mm²#N/A0.4300.455 247584675.xls.ms_office\Footing\10/15/2014\2:56 AM
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