session 9 guardrail attachments to bridge ends. common deficiencies in bridge railings inadequate...
TRANSCRIPT
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Session 9Guardrail Attachments to
Bridge Ends
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Common Deficiencies in Bridge Railings
Inadequate Dynamic Strength
Potential for Snagging
Use of “Safety” Walk
Inadequate Transition
13-2
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Transitions Guardrail Deflects – Bridge Ends DONOT!!
Bridge End Connections are an example of a change in the type of Barrier Deflection Characteristics
Must Reduce the Deflection of the Guardrail before you reach the Bridge End from 3’ to Zero
Must have adequate Structural Connection
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Transition Considerations
Adequate structural connection to the bridge railing
Reduced post spacing and nested rail to increase stiffness gradually
Block outs and rub rails used to minimize snagging
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How can you REDUCE DEFLECTION of Standard
Strong Post W-Beam Guardrail Normal Guardrail Post Spacing is 6’3”
Reduce Post Spacing to 3’ 1½” and reduce deflection by 50%
Nest the Guardrail (double thickness) and reduce deflection by 50%
Add a Guardrail panel to the back of the Post and reduce deflection by 50%
Add a Rub Rail and reduce deflection by nearly 50% & reduce snagging potential
Combine 2 of the above and reduce deflection by 75%
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How can you REDUCE DEFLECTION of Standard
Strong Post W-Beam Guardrail
Nested
ReducedPostSpacing
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Gradually Increase Stiffness by Increasing the
number of Post
13-7
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Rub Rail Components - Std Draw RBC-001 002 & 003 “Guardrail
Connection to Bridge End Type A and A-1 Components”
Rub Rail
RubRail
Not Island Curb
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Standard Drawing RBC-001Guardrail Connector to
Bridge End Type A and A-1
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Inadequate Structural Connection or Stiffening of
Approach Rail
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Adequate Structural Connection Terminal Sect No
2 Plate A & B
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Inadequate Reduction in Deflection and Structural
Connection
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Transition of Curb and Rub Rail to Bridge’s Safety
Shape
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Addition of a Spacer Tube
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Combination of all of the Proceeding for a Successful
Transition
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Std Draw RBC-001 Guardrail Connection to Bridge End
Type A and A-1
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Curb Inlet Type BShould have Island Curb in
Throat of the Inlet Std Draw RBC-
001 Note 5 “Island Curb”
Std Draw RBD-280
“Match Adjacent Curb”
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Curb Inlet Type BShould have Island Curb in
Throat of the Inlet
Lt Std Draw RBD-280 Curb Box Inlet Type B (Detail Drawing) “Match Adjacent Curb”
Rt Std Draw RDB-281 Curb Box Inlet Type B (Steel Drawing) "Island Curb Detail”
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Type B Drainage Box As-Builts vs. Std Draw
Construction memo No 5-11July 6, 2011
Have not been getting Island Curb on Type B Inlet therefore a Const Memo was Issued
See Std Draw RBC-001, RBD-280, RBD-281 Previous Slides
Corrective Actions: Retrofit by extending the double ply rail from
25 linear feet to 50 linear feet Replace the drain box top with the correct
one
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Std Draw RDB-280 Curb Box Inlet Type B 2012 Design Changed Detail to Show Island Curb instead of Std
Curb
Changed to Island Curb
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Normally getting Standard Curb instead of Island Curb
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What makes this a good Guardrail Connection to Bridge
End? Q & A Time