Spliced Concrete Girder Projects

7/27/2019 Spliced Concrete Girder Projects

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ACEC/NCDOT Spliced Girder Workshop

Spliced Concrete Girder Pro jec ts

Con t inuous Spans

Bow River B r idge, AB

Main St. Viaduc t, Pueb lo , CO

Rosebank -Patik i In terchange, NZ

Palm Valley B ridge, FL

Moore Haven B ridge, FL

Rou te 33 Br idges, West Po int, VA


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Con t inuous Span Projects

Bow River Br idge, AB

Bu i l t in 2002

4 spans : 2 at 174 ft, 2 at 213 ft

One segment per span

211 ft beams weighed 268,000 lb.

Beams 9.2 ft deep w ith 6.9 in . web

11.65 ft beam spac ing

Very h igh l ive load requ irements

Concrete saved 10% over steel girders


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Bow River Br idge, AB

Longes t known s ing le

piece girders sh ipped

by tru ck at 211 ft long


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Main Street Viaduct, Pueb lo , CO

Bu i l t in 1995

734 ft sp l iced g irder struc ture

5 spans w ith 174 ft max. span

7 segments w i th 154 f t max.

72 in . deep g irder haunched to 96 in. over

2 piers End b lock sect ion used over 1 pier


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Erected on falsework & strongbacks

Spl iced to ach ieve greater spans w ith

restr ic ted p ier p lacement

Very t igh t schedu le and budget Aesthet ics, durab i l ity and low

maintenance costs were cons idered

8 Girders spaced at 10'-6"

Overal l deck w idth= 80'-0"


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Main Street Viaduct, Pueblo , CO


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Cons tant depth Weband th ickened Bot tom

Flange


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Strongbacks at sp l ices

instead o f towers


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Rosebank-Patik i In terchange, NZ

Bu i l t in 1997

2 - 435 ft sp l iced g irder struc tu res

Curved ramps w i th 492 f t radius

4 spans w ith 138 ft max. span

6 segments w i th 2 pier segm ents

71 in . deep g irders

Integral cap to p rov ide con t inu i ty

between sub- and superstructu re



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Spliced Unit

Pier

Segments

Splice at Pier


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In tegral Cap Strongback


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Bu i l t in 2002

3 spans (210' 290' 210' = 710')

5 segments in each girder l ine

Designed as sp l iced g irder by

consul tant

Barge delivery o f segments

Erected on falsewo rk

Ful l -leng th post-tensioned

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Haunched p ier segmen t: Special forms & bed

fo r 15' depth

8" web fo r 3" diam . PT

ducts

Strut fo r pretens ionedstrands in top f lange

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Haunched p ier segment

- Variab le web dep th to 15' to tal depth at pier

- Bottom f lange depth var ies s l igh t ly

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Pier segments : 15' deep , 141' long , 125 tons

End segments : 81" deep , 139' long , 100 tons

Drop-in segment: 96" deep , 148' long , 103 tons

1'-0" f ield c losure pour between al l segments


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To maintain unobs tructed channel

Tempo rary towers in back spans

Strong-backs at sp l ices between segmen ts

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Moore Haven Bridge, FL

Bu i l t in 2000

3 spans w ith 320 ft max . (RECORD)

5 segments w i th 15 f t deep haunched

p ier segments


Erected on falsewo rk

Spl iced g irder selected by contracto r

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Moore Haven Bridge, FL

3sp

anu

nit

320

'

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Route 33 Bridges , West Po in t, VA

2 br idges: Mattapon i and Pamunkey Rivers

Current ly under cons truct ion

Each br idge has two 4-span uni ts w i th

200'-240'-240'-200' spans

8 ft deep g irders haunched to 10'-6" deep

at piers


Erected on falsework suppor ted by foo t ings

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Route 33 Bridges at West Poin t, VA

Seven segments to fo rm

the 4 spansGirders and decks are

l igh tweigh t concrete

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Route 33 Bridges at West Poin t, VA

Lightweigh t concrete bu lb tee girders f 'c= 8,000 psi w ith max. dens i ty o f 125 pcf

Ligh tweigh t conc rete deck f 'c= 5,000 psi w ith max. dens i ty o f 120 pcf

Ligh tweigh t concrete was used to reducefoundation loads

Est imated 10% reduct ion in p i les fo r

main p iers

A lso reduced foundation s ize

VTRC perform ing mater ial tests and observing

const ruc t ion

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NCHRP Report 517 comp leted October 2003 Download from

http:/ /gul l iver. trb.org/publ icat ions/nchrp/nchrp_rpt_517.pdf

Selected resu lts o f research

List o f Spl iced Girder B r idges

Design Examples

Proposed revis ions to LRFD

Specs

NCHRP Pro ject 12-57

Extend ing Span Ranges o f

Precast Pres tressed Concrete Girders

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In i t ial Find ings

Most des ign op t ions for extend ing spanranges invo lve incremen tal changes to

cu rrent design methods and mater ials

Design opt ions need to be ident i f ied

Add i tional design guidance no t requ i red

Spl iced girders provide sign i ficant ly

increased span ranges for p recast

prestressed conc rete gi rders

Info rmat ion is lack ing

Focus of mos t of the act iv ity in the study

Continue
http://group4.pdf/http://group4.pdf/http://group4.pdf/

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Spliced Concrete Girder Projects