Ongoing MwRSF Research on Bridge Railings, Culvert Barriers, & Transitions
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1 Andrew Zickler, P.E. Complex Bridge Design and ABC Support Program Manager Virginia Department of Transportation AASHTO T-7 Technical Committee Spokane, Washington June 14, 2017 Ongoing MwRSF Research on Bridge Railings, Culvert Barriers, & Transitions
2 Research Project Overview Active & Planned Year 25 Midwest States Pooled Fund Program (FY2015) RPFP-15-AGT-1: TL-3 Development of a Standardized Concrete Buttress for MGS Thrie Beam Transitions Year 27 Midwest States Pooled Fund Program (FY2017) RPFP-17-AGT-3: Continued TL-3 Development of a Standardized Concrete Buttress for MGS Thrie Beam Transitions Nebraska Department of Roads 34-In. Tall Thrie-Beam Approach Guardrail Transition Year 26 Midwest States Pooled Fund Program (FY2016) RPFP-16-MGS-4: Development of a Top-Mounted Socket for Weak- Post Guardrail on Culverts 2
3 Research Project Overview Active & Planned Wisconsin Department of Transportation Evaluation of a Culvert-Mounted, Strong-Post MGS to MASH TL-3 Nebraska Department of Roads Cost-Efficient, TL-2 Bridge Rail for Low Volume Roads Year 27 Midwest States Pooled Fund Program (FY2017) RPFP-17-CONC-2: Development of an Optimized MASH TL-4 Concrete Bridge Rail (Phase I Funding) Iowa Department of Transportation Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing Ohio/Illinois Department of Transportation MASH TL-4 Steel-Tube Bridge Rail and Guardrail Transition 3
4 Approach Guardrail Transitions TL-3 Development of a Standardized Concrete Buttress for MGS Thrie Beam Transitions Objective Develop concrete end buttress that is compatible with NCHRP 350 and MASH approved thrie-beam approach guardrail transitions (with or without curbs) Recent Developments Continuation Study Funded (YR 27) Modified End Buttress Design 4
5 Original Standardized Buttress Dual chamfer versus single chamfer upper chamfer - 4 x4 to provide adequate lateral rail support lower chamfer - 4 x12 to mitigate concerns for wheel snag 6H:1V upper slope w/ height transition from 32 to 36 5
6 Test No AGTB-1 Excessive ORA values Modify buttress and retest 6
7 Design Modifications Original Design Modified Design Height Width Length 7 ft 7 ft Vertical Taper Top Chamfer Bottom Chamfer Ht of Bottom Chamfer 4 x24 1:6 Slope 4 x4 4 x12 3:1 Slope 11 4 x24 1:6 Slope 3 x4 4.5 x18 4:1 Slope 14 (blockouts) Retest Summer
8 NDOR 34-in. AGT Objective Develop and evaluate a 34 tall thrie beam AGT for future overlays Utilize modified standardized buttress design Bridge rails being installed 3 taller than nominal for compatibility with future overlays AGTs replaced/raised following overlay Attachment to buttress difficult Recent Developments Design Selected Full-Scale Crash Testing (2 of 2) 8
9 34-in. AGT Design First Installation After 3 Overlay 9
10 Test No. 34AGT-1 Met MASH TL-3 test no criteria 10
11 Test No. 34AGT-2 Met MASH TL-3 test no criteria 11
12 Barriers Attached to Culvert Structures Development of a Top-Mounted Socket for Weak-Post Guardrail on Culverts Objective Develop top-mounted, socketed attachment for Weak-Post MGS used on culverts with soil fill heights between 1 ft and 3 ft Recent Developments Steel and Concrete Sockets Developed Component Testing 12
13 Steel Socket HSS 4x4x⅜ tube, gusset plates, and base plate (epoxy anchored) 13
14 Steel Socket Component Testing 0 Impact (Weak Axis) 90 Impact (Strong Axis) 14
15 Concrete Foundation Design Based off socketed foundations for S3x5.7 cable posts #4 vertical bars epoxied into top slab #4 4 15
16 Concrete Foundation Testing 0 Impact (Weak Axis) 90 Impact (Strong Axis) 16
17 Conclusions Steel Socket and Concrete Foundation Crashworthy supports for weak-post MGS No damage to sockets/foundation Minimal displacement Applicable for fill heights Future Work Summary report and FHWA eligibility letter 17
18 Barriers Attached to Culvert Structures Evaluation of Culvert-Mounted, Strong- Post MGS to MASH TL-3 (WisDOT) Objective Evaluate MGS version of MwRSF s strongpost culvert attachment Recent Developments Begin construction of barrier system Two-full-scale crash tests summer 2017 Test nos and
19 MwRSF Culvert Mounted Guardrail NCHRP 350 Modified G4(1S) ½-post spacing MASH MGS 12-in. offset to headwall Epoxy or throughbolt anchorage options 19
20 Bridge Rail Systems Cost Efficient, TL-2 Bridge Rail for Low Volume Roads (NDOR) Objective Develop an Optimized Bridge Railing MASH TL-2 compliant Side mounted posts Minimize costs (material and labor) Prevent deck damage during impacts Minimize length of need Plan to design and test by end of
21 Rural Bridge Rails No Anchorage no rail tension Blunt Rail Ends spearing No Length of Need hazard not protected Large Posts snagging potential 21
22 NDOR TL-2 Bridge Rail Based on TL-3 MGS Bridge Rail W-beam Guardrail w/ 12 Backup Plates S3x5.7 Posts increase spacing to 75 Side mounted posts (nothing on top of deck) Directly Connects to Adjacent MGS Applicable for C.I.P. or Precast Decks Post-to-Deck Attachment - TBD 22
23 Bridge Rail Systems Development of an Optimized MASH TL-4 Concrete Bridge Rail Objective Develop optimized, concrete bridge rail to MASH TL-4 safety performance standards Recent Developments Literature Review MASH TL-4 barriers, concrete barrier shapes, yield-line analysis Future Work Barrier and deck conceptual design Design optimization Full-scale crash testing MASH 4-12 with 10000S 23
24 Bridge Rail Systems Combination Bridge Separation Barrier with Bicycle Railing (IaDOT) Objective Develop MASH TL-2, low-height, vertical-face barrier with an attached bicycle railing Determine minimum TL-2 vertical parapet height Combination rail must meet AASHTO LRFD guidance 24
25 Iowa TL-2 Combination Rail Current progress Analysis of 24-in. vertical parapet at MASH TL-2 ZOI analysis for vertical parapet Future work Design of parapet and combination rail Full-scale crash testing MASH test no
26 Bridge Rail Systems MASH TL-4 Steel-Tube Bridge Rail and Guardrail Transition (Ohio/Illinois) Objective Develop MASH 2016 TL-4, steel-tube bridge railing Side mounted Limit deck damage Considers future roadway overlays Develop MASH TL-3 AGT Attachment to existing MASH thrie beam AGTs 26
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