Checking The Anchorage Plate - Marcegaglia Buildtech Realpont system 75 Instruction Manual

Anchorage
with structural steel plates
ERECTION PLAN
In the event of there being a particular geometry to the scaffolding
(suspended bearing) and/or particularly high loads, a steel plate joined
to the wall with mechanical anchors can be used.
metal
decking
scaffolding
plate detail
CHARACTERISTICS OF THE MATERIALS USED
Materials having the geometrical and mechanical characteristics listed
below are to be used:
Tube ∅ 48.3 x 3.2 in S235JRH steel
A = 4,59 cm²
J = 11,69 cm²
W = 4,85 cm³
i = 1,59 cm
σ 1 = 1600 daN/cm²
σ 2 = 1800 daN/cm²
Anchorage with structural steel plate; S235JR steel
Should ribbing be found, the geometric/mechanical properties to be
taken into consideration are:
A P = reagent area of the ribbing section
W P = resistant module of the ribbing section
σ 1 = 1600 daN/cm²
σ 2 = 1800 daN/cm²
LOADS
The acting load on the anchor plate is transmitted by the ledger or by the
upright that is directly attached to it.
In general and in particular for the layout shown in ' A nchorage with
structural steel plate' , the vertical load applied by the scaffolding uprights
must be added to the wind element.

CHECKING THE ANCHORAGE PLATE

With reference to the erection diagram and the ' A nchorage with struc-
tural steel plate' loads, carry out resistance checks on the plates acting as
loads:
• upper plate:
T = N i N = N i x e
resistance check
M
σ = _____ < σ1
W p
T
τ = _____ < π1
A p
σ id = √ σ² + 3 π² < σ1
• lower plate
T = N e N = H
verification of the anchors
N M
σ = _____ + _____
A W
p p
T
τ = _____ < π1
A p
σ id = √ σ² + 3 π² < σ1
• verification of the anchors
The loads acting on the single anchors are:
T
Tb = _____ shear on the single anchor
2
M
Nb = _____ shear on the single anchor
d
The Tb and Nb values must be compared with the bearing capacities of
each anchor as supplied by the maker, reduced by the safety coefficient
2.2.
Instruction manual Prefabricated frames
46
•
M = N e x e
< σ1