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2012 MINK Local Roads Conference
 

2012 MINK Local Roads Conference

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Presented hy Ronald K. Faller, Ph.D., P.E.

Presented hy Ronald K. Faller, Ph.D., P.E.
Assistant Director & Research Assistant Professor
Midwest Roadside Safety Facility
University of Nebraska-Lincoln

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    2012 MINK Local Roads Conference 2012 MINK Local Roads Conference Presentation Transcript

    • Innovations and Research in Roadside and Median BarriersRonald K. Faller, Ph.D., P.E.Assistant Director & Research Assistant ProfessorMidwest Roadside Safety Facility (MwRSF)Nebraska Transportation CenterUniversity of Nebraska-LincolnLincoln, Nebraska2012 MINK Local Roads ConferenceStoney Creek InnSt. Joseph, MissouriSeptember 26-27, 2012
    • Midwest Roadside Safety Facility Introduction• 1.3 million traffic deaths & 50 million injuries per year around world – significant societal impact• 34,000 traffic deaths & 2.2 million injuries in 2009 in U.S. (NHTSA)• ⅓ of fatal crashes w/ fixed objects• Barrier innovations & ongoing research  Midwest Guardrail System (MGS)  long-span over culverts, low-cost bridge rail, side-mounted attachment to culverts, MSE wall applications, non-blocked steel post, rectangular wood post, minimum length  Stiffened Portable Concrete Barriers (PCBs) 2
    • Midwest Roadside Safety Facility Midwest Guardrail System (MGS)• Sponsored by Midwest States Pooled Fund Program• 50+yrs use strong-post W-beam guardrails• Early W-beam systems designed for full-size sedans & small cars• Varied performance for 27” W-beam guardrail• Metrication to 27¾” w/ many acceptable variations• Improve performance for high c.g. vehicles 3
    • Test No. 4798-71,963 kg/95.3 km/hr/24.0 deg686 mm (27 in.) HeightVehicle Rollover (Failure)Dynamic Deflection = 28.1 in. 4
    • Test No. 471470-27 Midwest Roadside Safety Facility2,075 kg/101.4 km/hr/26.1 deg686 mm (27 in.) HeightVehicle Rollover (Failure)Dynamic Deflection = 35.8 in. 5
    • Midwest Roadside Safety FacilityTest No. MIW-12,007 kg/99.8 km/hr/25.8 deg686 mm (27 in.) HeightVehicle Rollover (Failure)Dynamic Deflection = 39.4 in. 6
    • Midwest Roadside Safety Facility Design Concerns• W-beam guardrail weaknesses  light truck and high cg vehicle rollovers  installation height sensitivity  rail ruptures 7
    • Midwest Roadside Safety Facility Design Modifications for MGS• 31 in. tall & 40-in. embedment depth• 12-in. deep blockouts• Rail splices at midspans• 6-ft 3-in. post spacing w/ W6x9s 8
    • Midwest Roadside Safety FacilityTest No. NPG-1887 kg/102.9 km/hr/20.0 deg813 mm (32 in.) HeightVehicle Redirected (Pass)Dynamic Deflection = 17.4 in. 9
    • Midwest Roadside Safety FacilityTest No. NPG-41,986 kg/98.1 km/hr/25.6 deg787 mm (31 in.) HeightVehicle Redirected (Pass)Dynamic Deflection = 43.1 in. 10
    • Midwest Roadside Safety FacilitySummary and Conclusions• 31” MGS improved TL-3 safety performance over 27” W-beam guardrail  improved stability for light trucks  greater construction tolerances  reduced concerns for rail rupture• R&D on special applications  reduced post spacing, curbs, 8:1 approach slopes, 2:1 fill slopes, MSE walls w/ 3:1 slopes, spanning culverts, attachment to bridges & culverts, w/ & w/o blockouts, AGTs, post options, increased heights, end terminals, minimum length 11
    • Midwest Roadside Safety Facility MGS Long-Span Guardrail• Sponsored by Midwest States Pooled Fund Program 12
    • Long-Span Guardrail w/ MGS Midwest Roadside Safety Facility - 25-ft unsupported length - uses breakaway wood posts 13
    • Midwest Roadside Safety FacilityTest No. LSC-2• 2,261-kg Dodge Quad Cab• 99.6 km/h - 24.9 degrees 14
    • 15
    • Midwest Roadside Safety FacilityMGS Bridge Railing• Sponsored by Midwest States Pooled Fund Program• Research Objectives  TL-3 guidelines of MASH  low-cost bridge rail for rural highways & county roads  available for use on bridges, including longer than 25 ft  minimize deck width  easy post replacement 16
    • Midwest Roadside Safety Facility Base Configuration• Half-post spacing (3 ft - 1½ in.)• S3x5.7 posts w/o blockouts 17
    • Midwest Roadside Safety FacilitySide-Mounted Bridge Deck Connection• 4”x4”x⅜” tube w/ top plate & L bracket• 1” dia. A325 hex bolt• Special deck reinforcement 18
    • Test No. MGSBR-15,174-lb Dodge QuadCab61.9 mph & 24.9 degreesD.D. = 49 in. 19
    • Midwest Roadside Safety FacilityTest No. MGSBR-1 20
    • Midwest Roadside Safety FacilityTest No. MGSBR-1 21
    • Test No. MGSBR-22,586-lb Kia Rio62.5 mph & 24.9 degreesD.D. = 28 in. 22
    • Midwest Roadside Safety FacilityTest No. MGSBR-2 23
    • Midwest Roadside Safety FacilityMGS Bridge Rail Adapted to Box Culverts• Sponsored by Midwest States Pooled Fund Program• Research Objectives  TL-3 guidelines of MASH  low-cost guardrail for rural highways & county roads  available for use on culverts, including longer than 25 ft 24
    • Top-MountedOne 1” Diam. Grade 2 Two ¾” Diam. Grade 2
    • Wrap-Around Side-MountedOne 5/8” Diam. Grade 2 Two ¾” Diam. Grade 2
    • Midwest Roadside Safety FacilityBogie Testing• Lateral Impacts (strong-axis bending)  20 mph & 25” load height• Longitudinal Impacts (weak-axis bending & shear)  20 mph & 12” load height• No damage to culvert or attachment hardware
    • Midwest Roadside Safety FacilityBogie Testing – Lateral Impacts Side-Mounted Top-Mounted
    • Midwest Roadside Safety FacilityBogie Testing – Longitudinal Impacts Side-Mounted Top-Mounted
    • Midwest Roadside Safety FacilityNon-Blocked MGS on Wire-Faced MSE Walls• Sponsored by Federal Lands Highway Division (Western, Central, & Eastern) and Federal Highway Administration• Research Objectives  TL-3 guidelines of MASH  economical barrier to treat vertical drop-offs  easily repaired  consider modified MGS 30
    • Welded Wire Wall - Sacramento River Road, NM 31
    • Baseline Configuration 32
    • Modified Configuration 33
    • Midwest Roadside Safety Facility 34
    • Midwest Roadside Safety Facility Test Requirements and Criteria• TL-3 of MASH  1100C (2,425-lb) small car @ 62 mph & 25 degrees  2270P (5,000-lb) pickup truck @ 62 mph & 25 degrees 3-10 3-11 35
    • Midwest Roadside Safety FacilityTest No. MGSGW-1 (1100C) 61.0 mph & 25.3 deg 61.0 mph & 25.3 deg 2,596-lb Kia Rio 2,596-lb Kia Rio 36
    • Midwest Roadside Safety FacilityBarrier & Vehicle Damage (MGSGW-1) Permanent Set – 20.1” Dynamic Deflection – 27.4” Working Width – 35.7” 37
    • Midwest Roadside Safety FacilityTest No. MGSGW-2 (2270P) 65.3 mph & 25.1 deg 5,169-lb Dodge Ram 38
    • Test No. MGSGW-2 (2270P) 39
    • Midwest Roadside Safety FacilityBarrier & Vehicle Damage (MGSGW-2) Permanent Set – 26.2” Dynamic Deflection – 35.7” Working Width – 45.2” 40
    • Minimum Lateral Offset 41
    • Midwest Roadside Safety Facility Conclusions & Recommendations• Met TL-3 of MASH• Economy w/ reduced structure width• No MSE wall damage & barrier easily repaired• Non-blocked MGS on level terrain?• Use spacer blocks when possible 42
    • Welded Wire Wall - Herber City, UT 43
    • Midwest Roadside Safety FacilityNon-Blocked MGS on Level Terrain• Sponsored by Midwest States Pooled Fund Program• Research Objectives  TL-3 guidelines of MASH 44
    • Midwest Roadside Safety FacilityMGS w/o Blockouts Midspan 12” Backup Splice Plate 6-ft W6x9 Steel Post 5/8” dia. x 1½” long (splice bolts)
    • Test No. MGSNB-12270P Pickup Truck62.7 mph & 24.7 degD.D. = 34 in.
    • Test No. MGSNB-21100C Small Car63.0 mph & 25.5 degD.D. = 29 in.
    • Midwest Roadside Safety FacilityMGS w/ Rectangular SYP Posts• Sponsored by Midwest States Pooled Fund Program• Research Objectives  TL-3 guidelines of MASH 48
    • Midwest Roadside Safety FacilityMGS with SYP Posts 12” Blockout 6”x8”x6’ SYP Post 5/8” x 22” Long Bolt 31” Rail Height
    • Test No. MGSSYP-12270P Pickup Truck62.2 mph & 24.9 degD.D. = 40 in.
    • Test No. MGSSYP-21100C Small Car61.4 mph & 25 degD.D. = 22.2 in.
    • 2270P – 4 fractured posts 1100C – 2 fractured posts
    • Midwest Roadside Safety Facility Blocked MGS: Wood vs. Steel Post Pickup Truck Small Car Evaluation Criteria MGS MGS Wood MGS MGS Wood Steel Post Post Steel Post PostOIV: Longitudinal (ft/s) 15.3 13.3 14.8 15.7OIV: Lateral (ft/s) 15.6 14.7 17.1 20.9ORA: Longitudinal (g’s) 8.2 8.1 16.1 13.0ORA: Lateral (g’s) 6.9 8.5 8.4 9.3Dynamic Deflection (in.) 43.9 40.0 28.6 22.2IS (kip-ft) 122.3 115.5 55.0 56.4
    • Midwest Roadside Safety Facility Minimum Effective Length of MGS• Sponsored by Wisconsin Department of Transportation• Research Objectives  minimum system length of MGS  barrier deflections for various system lengths  TL-3 guidelines of MASH• 75-ft minimum length for full-scale crash testing  historical length for crash testing – 175 ft  prior recommendations for minimum length, excluding bridge approach sections – 175 ft
    • Test No. MGSMIN-12270P Pickup Truck62.9 mph & 25.0 degD.D. = 43 in.
    • Midwest Roadside Safety FacilityLateral Stiffening of PCBs w/o Anchorage• Sponsored by Wisconsin Department of Transportation• Research Objectives  minimize barrier deflections without anchorage to bridge decks  utilize MwRSF’s 12.5-ft long F-shape PCB  TL-3 guidelines of MASH
    • Free-Standing F-Shape PCB MASH Test No. 2214TB-2 2270P Pickup Truck 62.0 mph & 25.4 deg D.D. ≈ 80 in.
    • Midwest Roadside Safety Facility Modular Double Tube & Bent Plate 2 ft5”x5”x3/16” steel tubes10-gauge cover plate
    • MASHTest No. RDTCB-12270P Pickup Truck62 mph & 25 degD.D. ≈ 42 in.
    • Midwest Roadside Safety FacilityDeformed PCB System
    • Midwest Roadside Safety FacilityDeformed PCB System