Rothoblaas Catalogue 2019

DESIGN LOADS

DESIGN LOADS

ANCHOR LINE - TYPE C In the anchor line systems, the design actions acting on supports vary depending on the geometry of the system and the type of support. The loads applied during tests act on the rope in the middle of the span as shown in the diagram. By varying the length of the span X and load Q, design actions F acting on supports are determined from laboratory tests.

In general, the worker fall load can be considered as variable load Q k , equal to the arresting force, and the fall loads for the remaining suspended workers as additional variable loads equal to their weight increased by a safety coefficient. Using a semi-probabilistic approach, we obtain:

X

F

F

Y

Q = Q k + ( n x Q k,i ) x γ ,q

Q

where: Q k = arresting force of the energy absorber n = number of workers suspended Q ki = weight of each additional suspended worker γ ,q = safety coefficient of hanging load

SINGLE POINT - TYPE A At the individual points, the load is directly transferred through the roper from the worker to the anchor device fixed to the structure.

Y

Q = F

TOWER SUPPORT CONTROLLED DEFORMATION - FORCE MANAGEMENT

Q

The TOWER element has a markedly elastic - plastic behaviour. Thus, for veri fication purposes, this behaviour must be considered differently from what usually happens when carrying out usual static checks. This behaviour allows reducing the load on the fastening system/structure. The bending moment that generates the plastic hinge at the base of the metal pole is equal to 3 kNm.

M

= 3 kNm

300/400/ 500/600

max

Q

130

FALL PROTECTION SYSTEM | DESIGN LOADS | 9