o_19jdnovcg1eh21852116govv1lgra.pdf

Arrangement of the ballast at the tower
The ballast is supposed to secure vertical and horizontal forces. It has to be positioned and fixed in a way that these
forces can be absorbed.
STAGEROOFS
A: symmetrically positioned elements basement has to be verified for the loading with the ballast
B: integration of the columns in a podium podium has to have sufficient load bearing capacities
C/D: ballast positioned on one side additional stress on the column (bending moment) because of the eccentricity
Friction coefficients
The friction coefficients are chosen according to DIN EN 13814.
For a steel spindle on wood (underpinning) on concrete/asphalt the DIN determines a friction coefficient of 0.4. If the spindle
is screwed together with the wood the coefficient may be raised to 0.6. Unfortunately there is no value given for the use of
a rubber mat.
Practical examples for friction coefficients:
1 2 3 4
ballast needed for 1 kN = 100 kg horizontal loading
1. teel spindle on concrete µ = 0,20 600 kg ballast
2. Steel spindle on wood on concrete µ = 0,40 300 kg ballast
3. Steel spindle screwed together with wood on concrete µ = 0,60 200 kg ballast
4. Steel spindle embedded in wood on concrete µ = 0,60 200 kg ballast
Autors:
Frank Bastians, Stefan Krasenbrink, Jan Keppler, Ralf-Harald vom Felde.
Further informationen of the autors:
www.krasenbrink-bastians.de sowie www.vom-felde.de
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