SPIDER® Rock protection system - Geobrugg AG

Represented in Table 3 are the forces from the maximum dynamic action
(peaks) together with the corresponding residual values. The forces S u and S o
mentioned in Figure 27 correspond to the forces in the top and bottom bound-
ary ropes. The force in anchorage 5 was set on the basis of the results from
the other tests at 50% of the force in anchorage 4. These tests with boundary
ropes exhibited a more or less symmetrical supporting behavior. For this
reason the forces in the side anchorages 7 and 8 were selected identical to
the values in anchorages 4 und 5.
top anchorages 1 3 1+3
dynamic [kN]
9.2
8.8
18.0
residual [kN]
3.3
3.6
6.9
bottom anchorages 10 12 10+12
dynamic [kN]
5.9
3.4
9.3
residual [kN]
2.7
1.7
4.4
side anchorages 4 / 7 5 / 8 4+5/7+8
dynamic [kN]
7.4
3.7
11.1
residual [kN]
2.4
1.2
3.6
boundary ropes top bottom
dynamic
6.5
15.0
residual
2.3
6.1
force relationships bottom : top η
dynamic
0.52
residual
0.64
force relationships side : top ζ
dynamic
0.61
residual
0.52
dynamic - residual relationships κ DR
top anchorages 2.63
bottom anchorages 2.13
side anchorages 3.09
top boundary rope 2.77
bottom boundary rope 2.45
Fig. 28: Max. and residual forces in
graph form
Tab. 3: Dynamic actions, residual forces
13