REF; TECH ASSOCIATESBS 8110 PROJECT :

CLIENT: OUTPUTELEMENT: CB5ANALYSIS

25 fy= 425

cover,c= 50 mm 1.5

Soil= Gravel 1.05

Soil saturated density= 22Depth of Fdn= 1 m

Soil bearing pressure= 200

Concrete density= 24DIMENSIONS

BASE COLUMNL= 2200 mm h= 400 mmB= 2200 mm b= 300 mmH= 450 mm

Dead(gk) Live(qk)Column reaction 630 40s/w 52.27Soil weight 57.11Total 739 40

Service load,N=gk + qk= 779 KNPad area required,A= Service load = = 779

soil bearing pressure 200

= 3.90 4.84 L=B=

= 1.97 m 'Recommend',L=B= 1975 mm OK

DESIGN

Loading at U.L.S=1.4gk + 1.6qk= 1.4x739.39+1.6x40= 1099.146 KN/m

Ultimate pressure on base= Loading at u.l.s = 227.1Pad area

Moment at column face =227.1x2200/1000x(2200/2-300) x(2200/2-300)/2x10^-9= 225.45353 KNm

H= = 162.1 mm OK

Assuming reinforcement of Y 25

d=H-c-r/2 =450-50-25/2 387.5 mm K= 0.03 OKNo compression reinforcement required

fcu= N/mm2 N/mm2

γc=γs=

KN/m3

KN/m2

KN/m3

LOADING(characteristics)KN

m2 Pad area provided=L x B= m2

KN/m2

Mu of concrete=0.156fcuBH2

M/fcubd2=

√𝐴

√(Mu/0.156fcuB)

b

h

L

B

REF; TECH ASSOCIATESBS 8110 PROJECT : 0

CLIENT: 0 OUTPUTELEMENT: CB5

= =0.5+(0.25-0.03/0.9)^0.5= 0.97

Z= 368.1 mm M0.87fyZ

1530.328 per mPROVIDE 11Y16-200B1

As provided= 2210.56 OKCheck for vertical shearMax shear is at d from the face of the column

V= Ultimate pressure x 2200 x(2200/2-300/2-387.5x1000^2

V= 281.04 KN ѵ= 281.04 x 1000 = 0.332200 x 387.5

100 x 2210.56 = 221056 = 0.26bd 2200 x 387.5 852500

Table Vc= 0.73 N/mm2 > 0.26 0K3.7 NO SHEAR REINFORCEMENT REQUIRED

Punching shearPunching shear is checked on a perimeter 1.5d=1.5x387.5 581.25 mm

Critical perimeter=(581.25 x 2 +300 ) x 4= 5850 mmShear=227.1(2200^2-(5850/4)^2)x10^-6= 613.42 KNShear stress= 613.42x1000 = 0.271 N/mm2< 0.73 OK

5850x387.5Check for max shear stress at the face of the columnMax shear=227.1x(2200^2-300^2)x10^-6= 1078.725 KN

Shear stress=1078.725X10^3/(4x300x387.5)= 2.32

<0.8x25^0.5= 4.00 OK

AS=

AS required= mm2

mm2

N/mm2

100As =

0.79[100As/bd]1/3 x(400/d)1/4/1.25=

N/mm2

N/mm2

0.5+√( 0.25− K/0.9 )d(0.5+√( 0.25− K/0.9 ))=

1.5d

REF; TECHIE ASSOCIATESPROJECT No:ELEMENT:

coverGravel 20 - 22 15 - 17Sand 18 - 20 13 - 16 20Silt 18 - 20 14 - 18 30Clay 16 - 22 14 - 21 40

50

- See more at: http://www.mathalino.com/reviewer/geotechnical-engineering/unit-weights-and-densities-soil#sthash.4tngl3om.dpuf

size spacing No.of Area provideY10 150 15 1178 15Y10-150B1

200 11 863.5 11Y10-200B1Y12 150 15 1696 15Y12-150B1

200 11 1243 11Y12-200B1Y16 150 15 3014 15Y16-150B1

200 11 2211 11Y16-200B1Y20 150 15 4710 15Y20-150B1

200 11 3454 11Y20-200B1Y25 150 15 7359 15Y25-150B1

200 11 5397 11Y25-200B1Y32 150 15 ### 15Y32-150B1

200 11 8842 11Y32-200B1

15 41020 42525 460303540

Type of soil

γsat (kN/m3)

γd (kN/m3)