Dynamic Impact Testing of Wood Posts for the Midwest Guardrail System (MGS) Placed Adjacent to a 2H:1V Fill Slope

McGhee, M. D.; Lechtenberg, Karla A.; Bielenberg, Robert W.; Faller, Ronald K.; Sicking, Dean L.; Reid, John D.; Midwest Roadside Safety Facility; Nebraska Transportation Center; University of Nebraska--Lincoln

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Dynamic Impact Testing of Wood Posts for the Midwest Guardrail System (MGS) Placed Adjacent to a 2H:1V Fill Slope

2010-12-16
By McGhee, M. D. ; Lechtenberg, Karla A. ; Bielenberg, Robert W. ; ...

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Creators:

McGhee, M. D. ; Lechtenberg, Karla A. ; Bielenberg, Robert W. ; Faller, Ronald K. ; Sicking, Dean L. ; ... More +

McGhee, M. D. ; Lechtenberg, Karla A. ; Bielenberg, Robert W. ; Faller, Ronald K. ; Sicking, Dean L. ; Reid, John D. Less -
Corporate Creators:

Midwest Roadside Safety Facility ; Nebraska Transportation Center ; University of Nebraska--Lincoln

Midwest Roadside Safety Facility ; Nebraska Transportation Center ; University of Nebraska--Lincoln Less -
Corporate Contributors:

Nebraska. Dept. of Roads ; Midwest States Regional Pooled Fund Program

Nebraska. Dept. of Roads ; Midwest States Regional Pooled Fund Program Less -
Subject/TRT Terms:

[+]

Compliance Test Crash Test Embankments Guardrails Highway Safety Impact Tests Longitudianl Barrier Posts Roadside Appurtenances Roadside Slopes Slopes Wood Posts
Publication/ Report Number:

TRP-03-234-10
Resource Type:

Tech Report
Geographical Coverage:

United States ; Nebraska

United States ; Nebraska Less -
Edition:

Final Report
Corporate Publisher:

Midwest Roadside Safety Facility ; University of Nebraska--Lincoln

Midwest Roadside Safety Facility ; University of Nebraska--Lincoln Less -
Abstract:

A stiffened version of the Midwest Guardrail System (MGS) with steel posts has been developed for use adjacent to 2H:1V roadside slopes. However, many members of the Midwest States Pooled Fund Program utilize wood posts. Therefore, it was requested to determine a wood post alternative to the steel posts utilized in the MGS adjacent to a 2H:1V slope. Dynamic impact testing was conducted on 6-in. x 8-in. (152-mm x 203-mm) wood posts and W6x9 (W152x13.4) steel posts with varying lengths and embedment depths when installed at the slope breakpoint of a 2H:1V slope. A total of seven bogie tests were performed - five tests on wood posts and two tests on steel posts. The posts were embedded in strong soil conforming to AASHTO Grade B for all tests. For each bogie test, acceleration data was used to determine the force vs. deflection and energy vs. deflection characteristics of the various post installations. Post-soil interaction forces and energy dissipation characteristics of the wood posts were compared to those for the steel posts used in the original design of the MGS adjacent to a 2H:1V slope. From these comparisons, a recommended post length was selected for the wood post alternative to the steel post in the MGS adjacent to a steep slope. A 7.5-ft (2.3- m) long, 6-in. x 8-in. (152-mm x 203-mm) wood post with a 58-in. (1,473-mm) embedment depth was found to provide the best possible performance and the closest correlation with the 9-ft (2.7-m) long, steel post. As such, this wood post was recommended as an alternative for the 9-ft (2.7-m) long, W6x9 (W152x13.4) steel post utilized in the MGS placed adjacent to a 2H:1V slope.
Format:

PDF
Funding:

SPR-3(017)
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:e006bf84a6a8ae46f66c0ee70e3ca5eab17888334382eb7be0652ec66538dc18
Download URL:

https://rosap.ntl.bts.gov/view/dot/39717/dot_39717_DS1.pdf
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Dynamic Impact Testing of Wood Posts for the Midwest Guardrail System (MGS) Placed Adjacent to a 2H:1V Fill Slope

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