Estimation of embedment depth

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

Also, the shear force V_Sd≤ V_pl,Rd/4 should be transferred automatically with the bending moment M_pl,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/b_c limited by the column resistance in bending M_pl,Rd and shear V_pl,Rd. The table shows the cohesion resistance F_Rd, punching resistance V_Rd, compressive resistance under the plate F_ber,Rd and compressive resistance without base plate F_ber,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 γ_M0=1,15 and γ_c=1,5.

Foundation gemetry

The relative embedment depth for M_pl,Rd and V_pl,Rd for bending and shear, steel S235, concrete classes C30/37 a C40/50, partial factors γ_M0=1.15 and γ_c=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]	N_pl,Rd [kN]	V_Rd [kN]	F_Rd [kN]	F_ber,Rd [kN]	F_ber,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:	*N_pl,Rd*	The vertical resistance
	*V_Rd*	The cohesion resistance
	*F_Rd*	The punching resistance
	*F_ber,Rd*	The resistance affected by the embedment depth and punching with base plate
	*F_ber,0,Rd*	The resistance affected by the embedment depth and punching without base plate

GEO5

FINEC

TRUSS4

FIN EC

Online nápověda