o_19jdnovcg1eh21852116govv1lgra.pdf

Structural Report
The geometry of the truss riggs is adapted individually to the
needs of the event. Usually the suspension points are
determined by the event location. The precise suspension
possibilities with the according load limits have to be known
before the hanging of a rigg. This informations should be
provided in written form by the management of the hall.
If this information is not available it has to be calculated on
the basis of the existing structural report of the hall. Additional
loads should not be applicated on an existing construction
without further examination / structural analysis.
SUSPENDED TRUSS
dynamic increase factors. Particularly fast moving systems or
systems with loads that are moved above persons should be
calculated with a higher increase factor.
Attachment gears:
The load bearing capacities of attachment gears are given by the
manufacturer. The maximum utilization is limited to 50 . For example
for wire ropes a utilization coefficient of 5 is required, according
to BGV C1 this value has to be doubled again.
As stated above only very simple constructions with defined
boundary conditions can be dimensioned by using the
manufacurer's information.
Usually these informations are restricted to a single span
beam with uniformly distributed loading or a single load in
the middle of the beam. But already the two-span beam -
a simple system - can not be measured this way.
In the following two examples for explanation (single- and
two-span beam):
Example 1: length truss: 8.0 m
loading: 0.50 kN/m i.e. 50 kg/m
self-weight truss: 0,10 kN/m
This is the only example that can be measured with the
loadcharts usually published by the manufacturer. The
reaction forces at the hanging points result from the
self-weight of the truss and the suspended load.
Excerpt from the BGI 810-3
Support means - Choice of motors
There are different classifications for the common hoists
(motors). A distinction is made here between BGV C1, D8, D8
The sum of the loads is evenly divided on both supports, in
this case: 8.0 / 2 x (0.50 + 0.10) = 2.4 kN.
This load assumption is very simplified. It is important to take
all loads into account. This includes cable loading, loads for
motors and attachment gears, etc.
Usually these loads are not uniformly distributed but resulting
of a number of different single point loads. If the single point
loads are evenly distributed the calculation above is correct,
otherwise the reaction forces have to be determined from the
unevenly distribution.
Example 2: length truss: 2 x 8.0 m
loading: 0.50 kN/m i.e. 50 kg/m
self-weight truss: 0.10 kN/m
with secondary safety component and D8+ motors.
Excerpt from SQ P2
A BGV C1 motor may lift respectively suspend loads above persons.
All other motors may not lift loads above persons. D8 motors
with secondary safety component and D8+ motors may suspend
loads above persons only statically. It must be ensured that the
secondary safety component is attached in such a way that there
is no drop (drop = 0 cm). It is reasonable to unload that motor.
The secondary safety component has to be installed
inherently safe which means only half of the WLL of the
secondary safety component and the motor may be utilized.
In this case the loadcharts can not be used without further
calculation any more. The permissible loads of the truss
charts can not be utilized completely but have to be calculated
seperately.
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