We are replacing some expansion joints on bridges on I-80 where we have 42-inch single slope barrier both on the bridge decks and in approach of the bridge. The approach barrier has a 10-inch deep footing and the barrier is fairly heavily reinforced. The bridge barrier is tied into the deck and should have adequate end condition support. Several years ago we decided to use the New York Portable Concrete Barrier Key to connect the approach barrier to the bridge barrier at expansion joints to provide transfer of the lateral forces from one barrier to the next. It appears New York modified the key cap before MwRSF did some recent testing for New York.
Now days, we use a deeper footing similar to what MwRSF developed for the 42” nearly vertical barrier with head-slap consideration to provide full end condition support. It is not practical to replace the footing for these installations while only replacing the expansion joints. My question is, do you think this existing key style connection is adequate to provide sufficient support at the end of the approach barrier given the depth of the footings and reinforcing?
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