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Bridge railings: procedure for determining the test level

Bridge railings: procedure for determining the test level

Bridge railings: procedure for determining the test level

(OP)
Hi bridge engineers,

AASHTO specification 'Guide Specifications for Bridge Railings' 1989 includes a procedure for determining an approproate performance level for a given site. This procedure is not included in NCHRP Report 350. Please advise:
- What documents or AASHTO specifications also include this procedure?
- What is the current practice in USA in determining an appropriate test level for a bridge site?

Any idea would be greatly appreciated.

Hanson

RE: Bridge railings: procedure for determining the test level

Usually, the state DOT's have standard barrier railing designs each of the various test levels. In NY and I'm sure other states as well, the selection of a railing or barrier is based on the traffic volume.

AASHTO LRFD Bridge specs provide guidance on the design of non-standard railings & barriers.

Hope that helps.

RE: Bridge railings: procedure for determining the test level

(OP)
Thanks bridgebuster for your response.
You're right, the selection of a railing is based on a risk assessment in which traffic volume is considered. I have no problem with the design of the railing, however, the procedure for determining the appropriate test level for a bridge site is not clear to me.
Hansonn

RE: Bridge railings: procedure for determining the test level

Hansonn,

Take a look at the LRFD Bridge Specifications, Section 13.7.2, which describes the traffic conditions of the test levels.
 

RE: Bridge railings: procedure for determining the test level

(OP)
Thanks bridgebuster

Regards,

Hansonn

RE: Bridge railings: procedure for determining the test level

no problem

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