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"Slight" Modification to IL F-shape Temporary Concrete Barrier

Question
State IL
Description Text Recent discussions with industry indicates they feel that modifying the corners of the toe of the IL F-shape Temporary Concrete Barrier (TCB) from a 90-degree angle to a 45-degree angle (the exact dimension of this "chamfered" area was not defined) would make TCB less likely to be damaged when setting and relocating. We understand the importance of engaging the corners being part of the crash testing, energy absorption, and deflection performance. How would such a  modification by chamfering the corners affect performance results of prior crash testing results and subsequent approval of this barrier as a Test Level 3 device meeting NCHRP 350 requirements?
Keywords
  • Temporary Barriers
Other Keywords none
Date November 25, 2013


Response
Response

We have observed several other states providing similar types of chamfers on their barrier edges to limit damage to the sections during moving and placement.

Typically, we have seen and approved the use of 3/4" chamfers on the barrier edges and believe that the affect of that size of chamfer on barrier safety performance is minimal.

Similarly, we would not expect a 1" chamfer to affect safety performance and would consider it acceptable. However, larger chamfers (2" or greater) may begin to cause some concern.

Date November 25, 2013


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