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BS EN 1991-2

TRAFFIC LOADS ON BRIDGES

Click on the Clause No. for the commentary.
 

INDEX
 

CLAUSE No

SUBJECT

Collision forces on vehicle restraint system

 

Problem:

Note 3 recomends a value of 0.75αQ1Q1k for the vertical loading on the deck. The UK National Annex cl. NA.2.30.2 revises the vertical load to 0.75 times LM1, but PD 6688-2:2011 Clause 3.13.1 suggests LM1 is αQ1Q1k and not (αQ1Q1k + αq1q1k) as defined in Cl.4.3.2.
[ Where αQ1Q1k = Tandem System & αq1q1k = UDL System ]

Solution:

The British Standards Committee will be drafting amendments to PD6688-2 and UK NA to BS EN 1991-2 to clarify that both the Tandem System and UDL System should be applied.
Note: These vertical loads are applied on the deck in Notional Lane Nr. 1 together with the Accidental Axle Load and Collision Forces for high containment parapets (Class C and D in Table NA.6 of NA to BS EN 1991-2:2003).
 

 

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Last Updated : 7/11/2014
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