Design of Roadside Barrier Systems Placed on MSE Retaining Walls. NCHRP Report 663

摘要

Millions of square feet of mechanically stabilized earth (MSE) retaining wall are constructed annually in the United States. When used in highway fill applications in conjunction with bridges, these MSE walls are typically constructed with a roadside barrier system supported on the edge of the wall. This barrier system generally consists of a traffic barrier or bridge rail placed on a continuous footing or structural slab. The footing is intended to reduce the influence of barrier impact loads on the retaining wall system by distributing the load over a wide area. The proper design of the roadside barrier, the structural slab, and the MSE wall system requires a good understanding of relevant failure modes, how barrier impact loads are transferred through the structural slab into the wall system, and the magnitude and distribution of these loads.