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Estimation of embedment depth

The preliminary estimation is, that for concrete strength classes C20/25 and higher, the embedment depth H= 3bc is able to transfer full design plastic bending resistance of H-profile steel column Mpl,Rd,S235 (made of steel S235).

Also, the shear force VSd≤ Vpl,Rd/4 should be transferred automatically with the bending moment Mpl,Rd,S235.

The concrete foundation should be checked parallelly for shear stress and stress induced by soil.

The examples of design resistance for stiff axis of column are given in the chart and table below. The base plate has dimensions equal to the column cross-section. The plate thickness is selected in that way, that the resistance is equal to the compressive resistance of concrete. Dimensions are shown on the figure below. Following chart shows the proportional embedment depth H/bc limited by the column resistance in bending Mpl,Rd and shear Vpl,Rd. The table shows the cohesion resistance FRd, punching resistance VRd, compressive resistance under the plate Fber,Rd and compressive resistance without base plate Fber,0,Rd for given concrete depth under the column d. The concrete base is without shear reinforcement. The chart and the table are calculated for steel grade S235 and concrete classes C12/15, C20/25, C30/37, C40/50. Partial safety factors are γM0=1,15 and γc=1,5.

Foundation gemetry

The relative embedment depth for Mpl,Rd and Vpl,Rd for bending and shear, steel S235, concrete classes C30/37 a C40/50, partial factors γM0=1.15 and γc=1.5

Column

Base geometry

Design resistances

Cross-

section

Concrete class

d

[mm]

t

[mm]

a

[mm]

b

[mm]

a1

[mm]

b1

[mm]

H

[mm]

Npl,Rd

[kN]

VRd

[kN]

FRd

[kN]

Fber,Rd

[kN]

Fber,0,Rd

[kN]

HE100B

C12/15

C20/25

C30/37

C40/50

200

16

100

100

700

700

300

531

69

90

11

129

141

198

259

314

148

201

257

315

42

70

105

139

HE200B

C 12/15

C20/25

C30/37

C40/50

400

30

200

200

1400

1400

600

1596

860

349

432

502

483

679

889

1077

542

692

902

1096

126

206

314

419

HE300B

C12/15

C20/25

C30/37

C40/50

600

40

300

300

2100

2100

900

3045

594

775

959

1117

905

1272

1667

2020

1058

1371

1784

2163

240

399

599

799

Where is:

Npl,Rd

  • The vertical resistance

VRd

  • The cohesion resistance

FRd

  • The punching resistance

Fber,Rd

  • The resistance affected by the embedment depth and punching with base plate

Fber,0,Rd

  • The resistance affected by the embedment depth and punching without base plate

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