We have seen an increase in the deflected of the F-shape PCB when impacted with MASH vehicles.
Free-standing TCB deflections were significantly higher when testing was conducted with the 2270P vehicle under the MASH criteria as opposed to testing conducted with the 2000P vehicle under the NCHRP Report No. 350 criteria. TCB deflections increased 25 to 76 percent when the F-shape TCB was tested under MASH impact criteria. See attached table.
Test No.
Vehicle
Mass (kg)
Speed (km/h)
Angle
IS (kJ)
Dynamic Delfection (m)
Static Deflection (m)
ITMP-2
2000P
2005
100.3
27.1
161.5
1.15
1.14
TB-1
2270P
2268
99.5
25.7
162.9
1.44
TB-2
99.7
25.4
160.0
2.023
1.854
This increase in deflection is due to a couple of factors
In addition, the photos (Figure 1 and Figure 2 attached) show the damage from the 2270P testing. In this tests vertical cracks were observed completely through the barrier section. This amount of barrier damage was not observed in the 2000P testing and again suggests that our impact loads have increased.
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