Conclusion
Based on the data generated from experimental tests, the
following conclusions can be drawn:
r Models M1, M3, and M4 of the precast concrete barrier
system failed due to threaded rod anchorage failure
in the deck slab under the barrier wall associated with
secondary combined flexure-shear-bond crack patterns
appearing in the deck slab in some of these models.
r Model M1 of the precast concrete barrier wall system
proved to be as good as the cast-in-place concrete barrier
system represented by model M2 with respect to
strength at the barrier-slab joint.
r Models M3, M4, and M5 of the barrier wall system
proved adequate for strength at the barrier-slab joint
based on CHDBC design loads.
r Model M5 of the precast concrete barrier wall system
that was loaded at its end failed primarily due to local
punching shear around the loaded area associated with
diagonal flexural cracks exhibited over considerable
length of the barrier wall. However, the experimental
ultimate load capacity of model M5 is still greater than
the CHBDC design ultimate lateral load.
r Comparing results of models M3 and M4 of the
developed precast concrete barrier wall system, it can
be concluded that the presence of a cantilever portion
of the deck slab to support the precast concrete barrier
wall in slab-on-girder bridges increased the loadcarrying
capacity of the system by 12% for the given
cantilever length compared with that for thick slab or
voided slab bridge decks.