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Attached is a draft copy of our thrie beam anchorage. If MwRSF has any comments, please let me know.
|Date||February 9, 2009|
|Attachment||Thrie beam anchor v1.pdf|
For your new detail, I briefly glanced through the pages but did not see anything glaringly out of order. However, please note that I did not check dimensions, bar sizes, bar locations, or bar quantities. It appears that you have adapted transition details from a wood post variation of the Iowa Pooled Fund design from the mid- to late 90s. It is also recognized that you utilized the steel adaptor plate from a prior Missouri Pooled Fund design from the mid 90s. Various cross sectional views are also provided. However, I do not see where they are shown on the plans. In addition, it may be worth considering the use of some vertical bars over the first 4-5 ft to the left of the cold joint since a significant change in geometry occurs here when considering the loss of the foundation system.
At the present time, Bob is looking into alternatives for attaching the thrie beam end shoe and adaptor plate to the single slope barrier face. It should be noted that the embedded anchors utilized in the research study may no longer be available. For roadside applications, through bolts may be used as an option. We should wait to see what Bob comes up with for other anchorage options.
On another point, will the WsDOT be implementing the MGS guardrail in the future. If you anticipate this, you may consider the fact that modifications to the transition will be forthcoming after the project reports are completed.
|Date||February 10, 2009|
I have been looking into your question on the anchorage of the approach transition and I have some comments.
First, the original transition that was tested anchored the thrie beam to the single slope barrier using 7/8" diameter A325 bolts with "self-drilling" Redhead anchors. These anchors had a listed capacity of 20.5 kips in pullout/tension and 24.32 kips in shear. The higher grade bolt was required to address bending of the bolt. The issue that arises is that this anchorage is no longer made. Thus, we looked through the available alternatives.
|Date||February 11, 2009|
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