was loaded at midlength. In this case, the slab was laid
over the laboratory floor to prevent vertical deflection,
simulating a barrier wall connected to a thick slab or
voided-slab bridge superstructure. However, model M3
was intended to simulate the flexibility effect of the slab
cantilever on the structural performance of the barrier
wall. Figure 6 shows the side view of the reinforcement
and load location for model M3, which was also the
same for model M4. However, the barrier-deck cross
section for model M4 was similar to that for barrier
model M1 (Fig. 4). Barrier model M4 was loaded at
midlength similar to model M3.