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TL-3 Reinforcement and Anchorage

Question
State KS
Description Text
We’re still working through some details on the SCI installation with modified concrete block design and wanted someone to take a look at the reinforcement/anchorage details to see if they would be adequate for a TL-3 type application. The details we’re proposing are included in the attached PDF (shaded in red). We tried to mimic what KS has used historically for TL-3 roadside barriers at retaining wall locations. Can you review the details and let me know your thoughts?



Permanent Concrete Barriers



Date May 8, 2018
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Attachment KA-4685-01 Gore Details.pdf
Response
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The transverse steel appears to be adequate.  I am a little unclear about the longitudinal steel.  There is a note that says #4 bars @ 3 equal spacings.  Is that per side (front and back)?  The drawing only show 2 bars in the upper right corner of the U-bar.  Also, does the longitudinal steel extend the entire length of the concrete block – the note and rebar is only shown in Section B-B not in A-A.


Date May 9, 2018
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Response
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Scott – I highlighted the longitudinal steel locations (see screenshot below). These would extend through the entire length of the concrete block and the #4 bars on the outside would tie into the longitudinal steel in the rectangular block behind the SCI (see other screenshot below). So the #4 bars run along both sides and through the top of the block with the #4 bars on the top of the wider block terminating at the back side of the rectangular concrete shape behind the SCI… Does that make sense?

 


Date May 10, 2018
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Attachment KDOT-1.jpg Attachment KDOT-2.jpg
Response
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Ok, got it.  With the barrier width, anchorage, and reinforcement you have detailed, I believe your concrete block should be able to withstand TL-3 impacts and sustain little to no damage.


Date May 11, 2018
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