Breviar Calcul Fundatie Izolata 445q6x

Calculation of a concrete foundation for metallic pillar (F1), acc. NP 112-2013 and SR EN 1997-1: → Foundation type concrete block and bearing FOUNDATION SOIL TYPE: - Polygenic gravel with a greyish-gray bonding mass 1. PREDIMENSIONING • Establishing the depth of foundation (acc. Annex C): cm - for PLOIESTI Hinghet = 100 Df,min=Hi+10cm = Df =

1,2

110 cm - acc. Table C.1 acc. to Geotechnical Study

• Predimensioning conditions of the bearing according NP112-2013:

- the hight of the bearing will accomplish the minimum values: • h c ≥ 300 mm => hc = 800 mm •

≥ 0,25

=>

• tgβ ≥ 0,65 =

lc = =

600

mm =>

= 1,3

2,286

• if tgβ ≥1,0 then it is no longer necessary to check the bearing at the shear force; → The proposed size of the concrete bearing: lc = 600 mm bc =

600

mm

hc =

800

mm

• Predimensioning conditions of the concrete block according NP112-2013: • H ≥ 400 mm • tgα = acc. Table II.4 =>

tgα =

1,3

=> we will choose H=

=>

H = 500

390 mm

mm

• for a concrete block with one step:

= 0,50 ÷ 0,65 and

= 0,50 ÷ 0,65

• for a concrete block with more steps:

= 0,40 ÷ 0,50 and

= 0,50 ÷ 0,65

=> =>

L= B=

923 923

÷ ÷

1200 1200

mm mm

=> =>

L = B =

1200 1200

mm mm

2. CALCULATION OF THE CONVENTIONAL PRESSURE: pconv = pconv 2.0m + CB + CD pconv 2.0m = 300 kPa – the basic amount of the conventional pressure of the ground; ↘ correspond to conventional pressures for foundations with the sole width B=1,0m and the foundation depth from the system ground level D = 2,0 m. CB – width correction; CD – depth correction; 2.1 Calculation of the width correction • For B ≤ 5m the width correction will be: CB = pconv 2.0m * K1 * (B-1); K1 = B = CB =

0,1 1200 6

- for non-cohesive soils; mm - foundation width;

2.2 Calculation of the depth correction • For D ≤ 2m:

CD = pconv 2.0m *

CD = γ * (D-2) • For D > 2m: D = 1,2 m γ = volumetric weight of the layers above foundation level (calculated as a weighted average with the thickness of the layers). CD = -60 → pconv =

246

kPa