Click for next page ( 66


The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement



Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 65
65 Exhibit 9.0. Recommendations for posts separated from rail repair. Damage Mode Repair Threshold Relative Priority Posts Separated 2 or more posts with blockout attached with post-rail Medium from Rail separation less than 3 in. Post-rail separation which exceeds 3 in. Note: If the blockout is not firmly attached to the post, use the missing blockout guidelines. Note: Damage should also be evaluated against post/rail deflection guidelines. 1 post with blockout attached with post-rail separation Low less than 3 in.. Note: If the blockout is not firmly attached to the post, use the missing blockout guidelines. Note: Damage should also be evaluated against post/rail deflection guidelines. 12.4 Recommendation aration which exceeds 3 inches begins to take on the charac- teristics of the missing blockout damage mode. Repair for any The simulations conducted for this study indicate that the single post with post and rail separation over 3 inches is rec- separation of up to two adjacent posts from the rails of the ommended. The priority assigned to this damage was medium guardrail did not pose a risk to the vehicle or occupant. Indeed, to be consistent with the missing blockout guideline. it was found that the crash performance from this damage Post and rail separation rarely occurs without post and rail mode was almost indiscernible from that of the undamaged deflection or damage to other components. In the recommen- barrier performance. The recommended repair threshold is dation in Exhibit 9.0, the research team recommends that the 2 or more adjacent posts that are detached from the rail; each damage should also be evaluated using the deflected post and deflected no more than 3 inches away from the rail. The pri- rail guidelines. Similarly, if the blockout is damaged or miss- ority assigned to this damage was medium for consistency ing, maintenance personnel should use the damaged block- with the post and rail deflection guidelines. Post and rail sep- out repair guidelines.