Procedure di test per parapetti
Di seguito viene riporata la procedura di test per parapetti riportata nella EN ISO 14122-3
8.2 Testing of guard-rails
8.2.1 General
The testing is carried out at a guard-rail element with three stanchions, hand- and knee rail, which is
mounted on the walkway.
All loads (F) are concentrated loads based on a minimum service load of 300 N/m in accordance with
8.2.1.1 or 8.2.I.2. The load shall be applied horizontally without introducing dynamic loading, first at the level of the centre of the handrail at the middle stanchion (Position 1, Figure 11). In the second test, the load shall be applied at the centre of the handrail at the least favourable point between two stanchions (Position 2, Figure 12).
The deflections, f1 and f2, are measured at the centre line of the handrail by a deflection gauge. In the first test, deflection fi is measured horizontally at position "L" (see Figure 11); in the second test, deflectionf2 is measured at position "I" (see Figure 12).
8.2.2 Loads
8.2.1.1 Load for verification of usability
The load for verification of usability is represented by Formula (2):
FU = 300 N/m x L (2)
8.2.1.2 Load for verification of strength
The load for verification of strength is represented by Formula (3):
FS = y x FU (3)
where the material factor y = 1,75 for steel and aluminium is derived using Formula (4):
FS = 525 N/m x L (4)
8.2.1.3 Preload
The preload is represented by Formula (5):
FP = 75 N/m x L (5)
8.2.2 Testing procedure
8.2.2.1 Testing at Position 1
To avoid setting effects, the preload, FP
, is applied to the handrail in Position 1, as shown in Figure 11, for 1 min. After removing the load, the dial has to be reset to zero.
The load, FU, shall be applied in Position 1 the same way. The deflection during the application of the load shall not exceed 30 mm.
After measuring the deflection, the load shall be increased to Fs. Apply Fs for one minute. After removing the load, the permanent deflection shall not exceed 0,3 % of the height, H.
Figure 11 — Stanchion measurement
Key
fi Deflection
L maximum distance between two stanchions
F Force
H height of the handrail
8.2.2.2 Testing at Position 2
To avoid setting effects, the preload, FP, shall be applied to the guard-rail in Position 2, as shown in
Figure 12, for one minute. After removing the load, the dial has to be reset to zero.
The load, FU, shall be applied in Position 1 the same way. The deflection during the loading shall not
exceed 30 mm.
After measuring the deflection, the load shall be increased to Fs. Hold Fs for one minute. After removing the load, the permanent deflection shall not exceed 0,3 % of the distance, L.
Figure 12 — Handrail measurement
Key
f2 Deflection
L maximum distance between two stanchions
F Force
H height of the handrail
a In general at L/2. For L, see Figure 11