General Characteristics; Joint Creep Strength; Split Rings; Characteristics Of The Materials Used - Marcegaglia Buildtech Realpont system 75 Instruction Manual

General characteristics

JOINT CREEP STRENGTH

During static checks, creep strength must be considered and determined
through crimp tests in officially and legally recognized laboratories:
• Right-angle couplers with 4 bolts
average resistance:
resistance at 5% fractile:
permissible resistance:
• 4-bolt right-angle coupler with holding joint
average resistance:
resistance at 5% fractile:
permissible resistance:

CHARACTERISTICS OF THE MATERIALS USED

Materials having the geometrical and mechanical characteristics listed
below are to be used:
Tube Ø 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
LOADS
Load bearings are determined orthogonally and longitudinally on the
scaffolding façade and those acting on the single anchorages in accor-
dance with the regulations in force and the project calculation designs.
Determine:
F = orthogonal load acting on the scaffolding façade and on the single
1
anchorage
F = longitudinal load acting on the façade of the scaffolding and on the
2
whole scaffolding
Rm = 1915 daN
R = 1756 daN
5
R = 1756/1,5 = 1170 daN
Rm = 2855 daN
R = 2717 daN
5
R = 2717/1,5 = 1811 daN

SPLIT RINGS

The extraction strength of the split rings must be provided by the manu-
facturer and in any case it is a good rule to apply a safety factor of ϒ=1,5.
Ring properties to be requested from the manufacturer:
A = area of the leg of the ring on the wedge insert
t
W = resistance module corresponding to area A
t
σ = 1600 daN/cm² unless otherwise specified by the manufacturer
H= permissible resistance to the extraction of the ring using a safety
factor of x 1.5 on the completed withdrawal value supplied by the manu-
facturer.
Instruction manual Prefabricated frames
36
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