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Full-Scale Vehicle Crash Tests on the Iowa Retrofit Concrete Barrier Rail




Ronald Faller, John Magdaleno, Edward Post




Three full-scale vehicle crash tests were conducted on the Iowa Retrofit Concrete Barrier Rail. Test I2-1 was conducted with a 1,849 lb. vehicle at 20 deg. and 56.8 mph. Test I2-2 was conducted with a 5,386 lb. vehicle at 20 deg. and 62.3 mph. Test I2-3 was conducted with an 1,849 lb. vehicle at 20 deg. and 62.5 mph. The total length of the installation was 100 ft. It consisted of 86 ft. of standard retrofit concrete barrier rail section and 7 ft. of concrete endwall section on each end of the standard retrofit section. Two construction joints were located 35 ft. inward from both ends of the installation. The bridge rail consisted of three major components: the existing concrete curb, the rectangular (retrofit) concrete wall-section, and the concrete endwalls. The overall height of the barrier was 32-in. above the roadway surface. The 86 ft. long, retrofit concrete barrier rail was doweled into the existing concrete curb and setback 3-in. from the curb face. The location of the vehicle impacts were set at 18-in. from both of the construction joints. The tests were evaluated according to the safety criteria in NCHRP 230 and also in the AASHTO guide specifications. The safety performance of the Iowa Retrofit Concrete Barrier Rail was determined to be satisfactory.


Highway Safety, Roadside Safety, Concrete Barrier Rail, Crash Test, Bridge Rail, Longitudinal Barrier, NCHRP 230, Curb

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