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|Description Text||We have a temporary work zone situation, where the designer would like to use portable concrete barrier for a potential rock fall concern. Most of the rock fall (95%) will be contained within the ditch section, but 5% could make it to the traveled lane.
The designer understands the concern over pinning barrier on the opposite side of traffic. But feel that it will be placed far enough away from the 30 mph work zone traffic to be a concern.
This is an interesting question and would appreciated you guidance on how the barrier would react to the forces describe below.
Currently our rock fall analysis is finding that a maximum of 5000 ft/lbs of total kinetic energy (translational plus rotational) could impact the barrier at 90°, typically at the base of the barrier or as high as 1' above the base of the barrier. Would J-barrier, which is pinned on the side being impacted, be able to withhold that impact? If it was not pinned what would the deflection be?
|Date||January 5, 2016|
I have briefly reviewed the inquiry regarding the rockfall concerns near roadways and the use of PCBs for debris containment. Below, it was noted that the impact energy for the design scenario would be approximately 5 kip-ft (6.8 kJ) when applied perpendicular to a portable concrete barrier (PCB) system. Initially, this kinetic energy seems to be rather low. However, I would like to give some perspective to a known quantity that is similar to the roadside safety community.
|Date||January 25, 2016|
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