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We have a couple of questions regarding the MGS Trailing End
1. On pages 155 and
2. On sheet 165, the cable anchor is shown to have an
|Other Keywords||trailing, end, terminal|
|Date||July 3, 2014|
|Attachment||MGS Trailing Terminal.docx|
|Response||The single 6'-3" rail segment was used for testing purposes to set the overall system length at 175'. For real world installations, this system length is not required and would not necessitate the extra rail segment. It is important to maintain the splice locations at the mid-span between the posts to maintain the benefits of the MGS system.
With respect to the anchor cable length, we believe that either length is acceptable. The hardware guide specifies the 78.75” long anchor cable. We have used that length in these types of end anchorage for many tests. In more recent years, our guardrail part supplier has begun supplying the 80” long version, so we have been testing with that.
One related item to note deals with the location of the cable bracket on the guardrail. According to the hardware guide, the cable bracket should be located such that the first bolt for the bracket is 1250 mm or 49.25” from the center of post no. 1. The downstream anchor report you mentioned above shows this distance as 47.625”. Going back through our records, it appears that this anchor bracket has varied slightly in location over time. However, we would recommend that the 49.25” location be used in order to be consistent with the hardware guide and to minimize the angle of the cable as it approaches post no. 1.
|Date||July 10, 2014|
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
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