ETL 1110-2-534
30 Sep 94
A-4. Load Testing of Guardrail Systems
(2) Compare applied stress to allowable stress:
If the analytical procedure discussed above shows
Mapplied
217,000 N mm
fapplied
the applied stresses to be grossly higher than the
5,340 mm 3
S
allowable stresses, an unsafe guardrail system is
165 MPa) ⇒ Good
41 MPa < ( fallow
indicated and upgrade and/or replacement actions
should be initiated. However, if the calculations
indicate only a marginal system, an in-situ load test
e.
Anchorage analysis.
of the guardrail system may be warranted since the
above analytical procedure is quite conservative in
(1) Calculate the applied force:
most cases. ASTM specification E 935-92 provides
guidelines for this type of test in a laboratory envi-
P
h
(890 N) (1,040 mm)
fapplied
ronment. No standard test device exists for the
d
114 mm
application of this test in a field environment and
SF
8.1 kN
(8.1) (1.65)
13.4 kN
thus the device and test setup must be designed by
the responsible engineer using ASTM E 935 as a
guideline.
(2) Compare applied force to allowable force:
fallow
F
n
(18.2 kN) (1)
13.4 kN) ⇒ Good
18.2 kN > (fapplied
A-9
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