I appreciate your input with regards to the above. This is definitely a
useful clue for me.
If you have handy with you this particular DIN STANDARD, may I request you
to scan forward me the relevant pages, if you can? I would really appreciate
Thanx any for your help. Regards,
SYED FAIZ AHMAD
From: "Stathis Papageorgiou" <epapag(--nospam--at)tee.gr>
Reply-To: "Stathis Papageorgiou" <epapag(--nospam--at)tee.gr>
Subject: Guard Rail Foundation Analysis and Design ?
Date: Sat, 16 Mar 2002 16:08:18 +0200
1. You may find some information in the German Standard DIN 1072, which,
I think, is also available in English.
In this Standard (para. 5.4(4) and resp. comments) it is stated that
'Distanzschutzplanken' (=Distance keeping protective barriers) need not be
designed for vehicular impact since the impact energy is absorbed thru
plastic deformation of the flex beam and the posts.
In case that the design of the directly supporting elements is required,
then a force of 25kN should be applied in each post at the middle height
of the flex beam.
2. You may also get information from the CALTRANS 'Bridge Design
Specifications' (para. 2.7), where, for posts pf that height, the
transverse (to the traffic) design load need not exceed 10 kips. A load
equal to one-half the transverse load on a post shall simultaneously be
applied longitudinaly, divided among not mor than four posts i a continuous
rail length. Above document is downloadedable and can be located at
3. For the foundation design I think that you may apply the procedures
followed for the pole design, short piles(Broms method) etc as might be
found in the specialized literature or just use your sound engineering
thinking to formulate the force interaction between foundation and soil (
but, which will be the acceptance criteria for the soil performance; should
they be based on strength or on displacement, etc ?).
4. Conclusion : Design of secondary (but may be not less critical)
elements is sometimes more difficult than it seems in the beginning.
> As you all may be knowing GUARD RAILS are protective
> barriers along side
> roads to protect the 'Street Furnitures'. Its other
> purpose is also to keep
> the vehicles within it, when hit, and not allow it
> to overturn or return to
> the track which might cause collision with the
> vehicles on this track.
> The GUARD RAIL foundations are usually not
> Engineered & the supplier's
> recommendation vis-a-vis its foundation is adopted.
> But I need to Engineer
> it because Iam contemplating an 'Alternate
> Foundation Type' for it.
> My questions therefore are:
> - how to go about the analysis & design of
> the guard rail foundations? For those of you
> who donot know it already, the GURAD RAIL
> consists of:
> - a flex beam of corrugated sheet metal
> fixed to the post; the post is usually a
> Channel Section about 700 mm (2ft-4in)
> high & center to center distance between
> posts are usually 1.90m or 6 ft 4-in.
> - the post is either driven into the soil
> or usually embedded in the concrete
> foundation which is usually 1.20 m
> deep; the plan dimension of this
> concrete foundation is usually 450&450
> or 18"* 18".
> - What forces should be taken into account?
> Any body having experience in the analysis & design
> of GUARD RAIL FOUNDATION
> willing to share his/her expertise, please? Thanx in
> advance for the help.
> SYED FAIZ AHMAD; MENGG, MASCE
> SENIOR STRUCTURAL ENGINEER
> SAUDI OGER LTD
> RIYADH, SAUDI ARABIA.
SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.
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