What Do We Want you to Get From this Session? Wh What mi mist - PDF document

2019 Bridge Design Conference 2/14/2019 MA MASH Im Imple plementation of of W ‐ Be Beam Guardrai Guar ail and and Bri Bridge Railin Railing Elizabeth Phillips & Katherine Smutzer INDOT Standards and Policy What Do We Want you to Get From this Session? • Wh What mi mist stakes es should should yo you av avoid wi with MGS MGS guar guardr drai ail sy systems? • If If yo you need need to to mo modify an an MGS MGS guar guardr drai ail sy system, send send yo your recommen mmendation on in in fo for re review, Desi DesignM gnManual nualInqui nquiries@ ries@indot. ndot.IN IN.gov • Wh What do do we we ha have to to look look fo forward to to fo for MA MASH impl plemen ementati tion on of of bri bridge railin iling? g? 1

2019 Bridge Design Conference 2/14/2019 Sunset Dates NCHRP 350/MASH 2009 Let Letting ing Dates ates (W (Wit ith Latest atest Up Upda dates) • Dece December 31, 31, 2017: 2017: St Standa andard W ‐ Beam Beam Guar Guardrail ail & Perm rmane anent Concr oncrete Barrie Barriers • June June 30, 30, 2018: 2018: Sing Single le ‐ Si Sided ded Ta Tangent Guar Guardr drail End nd Tr Treatments (End (End Te Terminals) • Dece December 31, 31, 2018: 2018: Im Impa pact Attenu nuators, s, Cable Cable Barrie Barriers & Cable Cable Te Terminals • Dece December 31, 31, 2019: 2019: Bridg Bridge rails ils, tempor orary work ork zon one devic ices*, tr trans ansitions, Cable Cable Barrie Barriers & Cable Cable Te Terminals, ot other her lon ongitudina gitudinal barrier ers (includes cludes Double ‐ Si Sided ded (M (Med edia ian) End End Trea eatmen tments, ts, Fla Flared End End Tr Treatments, W ‐ Beam Beam Guar Guardr drail ail Transition to Tr to Concr Concrete Bri Bridge Rail Rail, W ‐ Beam Beam Gu Guar ardr drail ail wi with th Reduced duced Po Post Spac Spacing ing),ot ,other term rmina inals, s, sign sign suppo support rts, s, and and all ll other bre reakaway hard rdwa ware re * Tempor orar ary work ork zone devices ices manuf nufactur ctured ed before 12/ 12/31/19 31/19 tha that were success ccessfull lly crash test sted ed under under NCHRP CHRP 350 or MASH ASH 200 009 may continue con inue to be be used used th throughout ughout their their “norm normal al ser service ice life. e.” IND NDOT wi will ll determ rmin ine “nor normal service ice lif ife”. Sunset Dates For OS End Treatments June June 30, 30, 2018: 2018: Sing Single le ‐ Si Sided ded Ta Tangent Guar Guardr drail End nd Tr Treatments (End (End Te Terminals) • 27 27 ¾” ¾” OS OS End End Trea eatm tmen ent is is no no lo long nger available ailable on on the the Ap Approv oved ed Mate Material al Li List (A (AML) • Don Don’t use use 27 27 ¾” ¾” OS OS End End Trea eatm tmen ent pa pay it item • Wh Wher ere a Cur Curved ed W ‐ Beam Beam Gu Guar ardrail ail Conne Connector Sys System re require res an an OS OS End End Trea eatm tmen ent. t. • a MGS MGS Hei Height ht Tr Transition should should be be used used to to allo allow a 31” 31” OS OS End End Trea eatm tmen ent to to be be pla placed. • If If sit site lim limit itations pr preven ent the the pla placemen ent of of both both a MGS MGS Hei Height ht Tr Transition and and a 31” 31” OS OS End End Trea eatm tmen ent, t, send send in in an an inquir inquiry fo for yo your the the pr project. oject. Provide the Pr the fo following wi with th yo your inqu inquir iry: y: • Projec Pr ect Des Des Num Number • Cons Constru truction tion pla plans • Plan Plan details ils sh should sh show th the st standar ndard gu guar ardrail ail sy system th that will will no not fit fit yo your lo location an and wh why • Appr pproa oach ch AAD AADT • Cr Cras ash his history at at the the in intersection 2

2019 Bridge Design Conference 2/14/2019 Curved Guardrail System (Std Dwg. 601 ‐ CWGS) • Cu Curved guar guardrail consis onsists of W ‐ beam beam and and co cont ntrolled ed re releas leased ed te terminal al (CR (CRT) pos posts • Cur Currently tly no no MASH MASH ‐ co comp mpliant equiv equivale lent • Des Design Opt Options ons • Tr Transition MGS MGS to to W ‐ bea beam. Use Use MGS MGS Heig Height Tr Transition and and Cur Curved Gu Guar ardr drail ail Syste System Standar andard. • Wh Where th ther ere is is lim limit ited ed space, space, it it ma may be be necessary to necessar to in install all NCHRP NCHRP 350 350 co compliant devi devices ces in in a quadr quadran ant th that re requi quires es cur curved ed w ‐ beam beam guar guardrail. ail. Coor Coordi dina nati tion on with with Standa St andards and and Policy licy Off Office is is re requir quired. Update: There is currently an active NCHRP Report, NCHRP 15-53, that is working on a curve end treatment with a rail height of 31 inches. The completion date is set for December 2019. Midwest Guardrail System (MGS) Reminders • Th The MGS MGS Tr Transition and and MGS MGS Lon Long Sp Span an requir quire th the use use of of 12 12 ‐ in. in. deep deep bloc blockouts. s. MGS Transition 3

2019 Bridge Design Conference 2/14/2019 Midwest Guardrail System (MGS) Reminders • Th The MGS MGS Tr Transition and and MGS MGS Lon Long Sp Span an requir quire th the use use of of 12 12 ‐ in. in. deep deep bloc blockouts. s. Min. Length of MGS Long Span, Type 1 or 2 MGS Long Span Pay Limits FYI: The W-Beam Each CRT Post has a Each CRT Post has a Nested Guardrail 12” blockout 12” blockout System used two 8” blockouts, a total of 16” at each CRT MGS Long Span post Midwest Guardrail System (MGS) Reminders • Pr Provi ovide 2 ft ft of of embankm bankment be behind hind th the back back of of pos post. Wher Where lim limit itatio ions with within in th the pr project pr preven ent th the 2 ft ft of of emb embankm nkment fr from being being plac placed. • Fo For Standar andard MGS MGS W ‐ Beam Beam Guar Guardrail (6’ (6’ ‐ 3” 3” pos post sp spacing) an an inqu nquiry iry is is not not requi quired, d, a le level tw two desig design exc except ption sh should be be fil filed with with th the pr project. t. • Fo For all all oth other MGS MGS W ‐ Bea Beam Guar Guardr drail ail Syst System ems, s, a pr proje oject specific ecific inqui quiry will be will be requi quired. d. Th The appr approved inqu nquiry iry sh should be be fil filed with with a le level tw two desig design ex except ption. Example MGS Long Span: Make sure to take into account the 12 inch blockout and 2 ft embankment width behind the post when laying out your typical section 4

2019 Bridge Design Conference 2/14/2019 Midwest Guardrail System (MGS) Common Mistakes • System System Modific Modifications tions • Do Do not not mod modify th the sy syste stems, e. e.g. g. re remove move a pos post, modi modify a pos post, reduce duce th the em embankment. If If you you ha have a pr project th that you you feel eel need needs special special cons consider ideratio ion, sen send in in an an inquiry quiry. If If an an app approved modi modifi fica cati tion on is is re recommen commended, th that re recom commendation on sh shou ould ld be be file filed with with a le level tw two design design ex except ption. • MGS MGS Lo Long Sp Span an Pay Pay Li Limits ts • Th The pa pay lim limit its ar are fr from ou outermost CR CRT pos post to to ou outermost CR CRT pos post. • Fo For th the sy syste stem to to pr preform pr properly ly a mi minim nimum len length of of MGS MGS w ‐ beam beam guar guardr drail ail sh shou ould ld be be pr provide ided on on th the appr pproach oach an and depa departure end ends of of th the ou outermost CR CRT pos posts. s. The The mi minim nimum len length can can include clude MG MGS w ‐ beam beam guar guardr drail, ail, a tr transition, an an OS OS end end trea eatm tmen ent, t, or or cable cable term terminal inal an anch chor. FYI: Do not Flare an OS End Treatment more than 25:1 A This length is required on the MGS Long Span Pay Items approach and departure ends of the outermost CRT posts. It may • Pay Item unit “Each” includes contain, MGS W-Beam Guardrail, distance between outmost CRT Transition, End Treatment, or Cable Terminal Anchor. These items are posts paid for separately from the MGS, • Additional length required Long Span, Type 1. each end. A Pay It Pa Item em Lim Limit, Ea Each, fo for Ty Type 1, 1, Be Between Ou Outmost ost CR CRT Po Posts = 43’ 43’ ‐ 9” 9” A CRT Posts w/ 12” CRT Posts w/ 12” Blockouts Blockouts 5