Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems (2012) / Chapter Skim
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Pages 104-112
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From page 104... ...
103 Although strong-post cable barriers were in use in some states as early as the 1950s, New York pioneered the development and testing of the weak-post design in the 1960s. This design, included in the 1977 AASHTO Guide for Selecting, Locating, and Designing Traffic Barriers as the G1 Cable Guardrail, may have been the first design guidance for a cable barrier system.
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From page 105... ...
104 Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems run-off-the-road fatalities and severe injuries. High-tension cable barrier systems are available from five manufacturers: Brifen, Gibraltar, Nucor Steel Marion, Gregory Industries (Safence systems)
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From page 106... ...
Guidelines for Cable Barriers 105 • The gentler the slope, the lower the effects on the trace of the vehicle interface area and the greater the potential for an effective vehicle-to-barrier interface. • Wider medians offer more effective lateral placement options.
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From page 107... ...
106 Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems • To avoid override of larger vehicles (SUVs and pickup trucks) , the barrier should not be placed in a region between 1.2 m (4 ft)
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From page 108... ...
Guidelines for Cable Barriers 107 results, as expected, indicated that in impacts with cable barriers, the maximum dynamic deflection is affected significantly by the end-anchor spacing and post spacing. Greater end-anchor spacing leads to increased barrier deflections.
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From page 109... ...
108 Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems caused by lower temperatures, or as a result of crashes into the barrier. Movement of the anchor in the soil decreases the tension in the cables which, when extreme, may result in unsatisfactory barrier performance.
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From page 110... ...
Guidelines for Cable Barriers 109 post or end anchor. Under this study, simulations were conducted to identify the minimum length needed for strong-post W-beam systems, and it was found to be 23 m (75 ft)
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From page 111... ...
110 Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems • Shorter post spacings should also be used to reduce the bending of the posts over time due to lateral forces applied by the cables on the posts. • The lateral placement guidelines developed under Section 5.1 should be followed to ensure adequate vehicle-to-barrier interface.
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From page 112... ...
Guidelines for Cable Barriers 111 • Because of the small marginal cost of adding an extra cable and the likelihood of improved safety performance of the barrier with an extra cable, benefit/cost analyses should be used to determine when a fourth or fifth cable is justified. • Periodic inspection schedules based on expected frequency of impacts should be established for each cable barrier installation.
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