Design of Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls

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Title: Design of Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls
Author: Kim, Kang
Abstract: Millions of square feet of mechanically stabilized earth 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 and to provide stability for the barrier against sliding or overturning . 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 into the wall system , and the magnitude and distribution of these loads . In this study , a procedure is developed that provides guidance for designing : 1 . the barrier -moment slab , 2 . the wall reinforcement , and 3 . the wall panels . These design guidelines are developed in terms of AASHTO LRFD procedures . The research approach consisted of engineering analyses , finite element analyses , static load tests , full -scale dynamic impact tests , and a full -scale vehicle crash test . It was concluded that a 44 .5 kN (10 kips ) equivalent static load is appropriate for the stability design of the barrier -moment slab system . This will result in much more economical design than systems developed using the 240 kN (54 kips ) load that some user agencies are using . Design loads for the wall reinforcement and wall panels are also presented .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -05 -754
Date: 2010-01-16

Citation

Design of Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -05 -754 .

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