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GEO5

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Base Anchorage

An anchorage of wall footing can be specified in program "Cantilever Wall". It is necessary to specify an anchor location, dimensions of a drill hole, and spacing of anchors.

Two limit states of bearing capacity are defined for an anchor:

  • bearing capacity against pulling-out Re [kN/m]
  • strength of anchor Rt [kN]

Base anchorage

Bearing capacities can be either input or computed from the input values using the following expressions:

where:

Tp

-

pull-out resistance

d

-

drill hole diameter

a

-

ultimate bond

SFe

-

safety factor against pulling-out

where:

Rt

-

strength of anchor

ds

-

anchor diameter

fy

-

yield strength of anchor

SFt

-

safety factor against pulling-apart

Approximate values of bearing capacity against pulling-out

Material

Ultimate bond

[N/mm2]

Ultimate strength for specified hole diameter [kN/m]

65 mm

75 mm

90 mm

100 mm

150 mm

Soft shale

0.21 - 0,83

42 - 169

49 - 195

59 - 234

65 - 260

98 - 391

Sandstone

0.83 - 1,73

169 - 350

195 - 407

234 - 486

260 - 543

391 - 562

Slate, Hard Shale

0.86 - 1,38

175 - 281

202 - 325

243 - 390

270 - 433

405 - 562

Soft Limestone

1.00 - 1.52

204 - 310

235 - 358

282 - 429

314 - 477

471 - 562

Granite, Basalt

1.72 - 3.10

351 - 562

405 - 562

486 - 562

540 - 562

562 - 562

Concrete

1.38 - 2.76

281 - 562

325 - 562

390 - 562

433 - 562

562 - 562