Table B Recommended tests

Test

pre-load

test load

outcome

No. 1

sr

sr

tf1

No.2

sr

0.5sr

tf2

The stored material strength parameters c, jc and j are calculated as follows:

4) The strength of cohesionless materials, (c = 0), is described by one parameter, the angle of internal friction j, (then is equal to jc).

NOTE A standard triaxial test may be used in preference to the test described above.

Figure B4 — Test method for determining the angles of internal friction j and jc and the cohesion c at the preconsolidation level sr

Annex C (Informative) Seismic Actions

NOTE This annex will be removed when this topic is covered in ENV 1998.

1) This annex gives general guidance for the design of silos for seismic actions. The design rules supplement general rules for the calculation of seismic actions on structures given in ENV 1998 and may be incorporated into ENV 1998 at a later stage.

2) The value of the earthquake acceleration for the silo structure is calculated according to ENV 1998. The silo and the particulate material may be regarded as a single rigid mass.

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