Increased Span Length for the MGS Long-Span Guardrail System Part III: Failure Analysis

Ranjha, Sagheer A; Bielenberg, Robert W.; Reid, John D.; Faller, Ronald K.; Midwest Roadside Safety Facility; Nebraska Transportation Center; University of Nebraska--Lincoln

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Increased Span Length for the MGS Long-Span Guardrail System Part III: Failure Analysis

2017-09-17
By Ranjha, Sagheer A ; Bielenberg, Robert W. ; Reid, John D. ; ...

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English

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Creators:

Ranjha, Sagheer A ; Bielenberg, Robert W. ; Reid, John D. ; Faller, Ronald K.

Ranjha, Sagheer A ; Bielenberg, Robert W. ; Reid, John D. ; Faller, Ronald K. 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:

Midwest States Pooled Fund Program ; Nebraska. Department of Roads

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

[+]

Analysis Compliance Test Crash Tests Failure Failure Analysis Guardrails Highway Safety Long Span MASH MGS Midwest Guardrail System Roadside Appurtenances
Publication/ Report Number:

TRP-03-362-17
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report: 2013 – 2017
Corporate Publisher:

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

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

The objective of this research study was to review and analyze the system failure observed during crash testing of an increased span length for the Midwest Guardrail System (MGS) long-span guardrail system in test no. MGSLS-2. Test no. MGSLS-2 was a full-scale crash test conducted on the MGS long-span guardrail with a span length of 31¼ ft (9.5 m). This test utilized universal breakaway steel posts (UBSPs) adjacent to the long span in lieu of the controlled release terminal (CRT) wood posts used in previous long span systems. An engineering analysis was undertaken to review the downstream end anchorage failure observed in test no. MGSLS-2. The analysis also compared critical aspects of the barrier performance with previous full-scale crash tests that had similar features or increased anchor loading. The results of this analysis and conclusions regarding potential causes of the anchor failure suggested that there was no identifiable root cause for anchor failure, but the pocketing and deflection suggest that the barrier system may have been pushed near its limits. It was noted that certain factors may have contributed to the anchor failure, including increased span length, location of the impact point, differences in the breakaway post behavior adjacent to the unsupported span, and natural variation in wood strength. Following the analysis, several potential design modifications were noted for improving the barrier system and reducing the potential for end anchorage failure. However, it was noted that further analysis of these potential improvements, selection of a preferred design, and evaluation of the revised barrier system through full-scale crash tests will be required to fully evaluate the system to MASH TL-3 criteria.
Format:

PDF
Funding:

TPF-5(193) Supplement #56
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:c0d037eabe55e026b56a72747b9502c3005ba96590e5dcc8241c37db9c246c20
Download URL:

https://rosap.ntl.bts.gov/view/dot/49153/dot_49153_DS1.pdf
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Increased Span Length for the MGS Long-Span Guardrail System Part III: Failure Analysis

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