BRIDGE ALTERNATIVES CLIENT - UNB
1
Timber Bridge [3] [1] [2] Existing Road Surface Road Elevations 0% 10% 20% 30% 40% 50% Resource Allocation Natural World Climate and Resilience TOTAL Quality of Life * Variance is due to some sub-criteria being subjective in evaluation $1.00 $1.25 $1.50 $1.75 $2.00 $2.25 $2.50 0 10 20 30 40 50 60 70 Millions Year of Service Lifecycle Costs End of Design Life (75 Yrs.) Construction Costs Bridge Details Bridge Type Beams Deck Barriers (TL-4/PL-2) Lateral Bracing # of Depth (mm) Type Depth (mm) Type Concrete 5 1000 New England Bulb Tees 225 Reinforced Concrete New-Jersey Shaped None Steel 5 923 W920x313 I-Beam Alaskan Multi-State Railing K-Bracings near supports Timber 9 1330 Glued- Laminated 235 Transverse Glued- Laminated With Floor Beams Crash Tested Timber Barrier 4 Sets of Timber Diaphragms Background Bay du Vin Bridge no. 5 located south-east of Miramichi is in need of replacement due to high water elevations damaging the bottom of the bridge, along with inadequate dimensions with respect to TAC standards. Cost Estimate Bridge Type Concrete Steel Timber Design $ 99,000 $ 120,000 $ 135,000 Construction $ 1,229,000 $ 1,495,000 $ 1,683,000 Low Estimate $ 860,000 $ 1,047,000 $ 1,178,000 Cost $ 1,328,000 $ 1,615,000 $ 1,818,000 High Estimate $ 1,843,000 $ 2,243,000 $ 2,624,000 Operation & Maintenance (Present worth of 75 year life) $ 40,000 $ 45,000 $ 151,000 Sustainability Assessment A sustainability assessment was completed using the Envision credit system provided by the Institute for Sustainable Infrastructure where material and infrastructure were evaluated. BRIDGE ALTERNATIVES DESIGN & MATERIAL COMPARISON PREPARED BY: 2020 BRIDGEWORKS RYAN BRENNAN, L. ROBERT ELLIOTT, DIKSHAIYE MATHOORA MATTHEW STEPHENS , NICHOLAS THIBODEAU CLIENT: SUSAN MAYO, P.ENG. NEW BRUNSWICK DEPARTMENT OF TRANSPORTATION AND INFRASTRUCTURE Existing Bridge Goal and Objectives NBDTI has requested the design of three alternative bridges to replace Bay du Vin Bridge no. 5 utilizing steel, concrete or timber to serve as a feasibility study between the three materials. This was achieved by completing the following objectives: ▪ Determination of the new bridge elevation to accommodate future high water. ▪ Design of the timber, steel and concrete bridges in accordance with CSA-S6 along with realignment of the approaching roads. ▪ Sustainability & lifecycle cost assessment for comparison of the building material. Summary of Results From the analysis, 2020 Bridgeworks concludes: • An expected high water elevation rise of 1.15m for a 1 in 100-year event while considering climate change. • Timber was found to be most sustainable; however, has an increased lifecycle cost. • Steel and concrete resulted in similar maintenance costs with timber requiring additional intermediate repairs. • Concrete resulted in the lowest total cost followed by steel and timber, respectively. Steel Bridge Concrete Bridge Road Work Bridge Type Surface Elevation Increase (m) Total Fill Volume (m 3 ) [1] Concrete 1.58 295 [2] Steel 1.49 165 [3] Timber 2.12 1135 New High-Water Elevation Predicted Peak Flow Predicted Raise in High Water Elevation Bottom of Existing Bridge Elevation Bottom of Proposed Bridge Elevation Proposed Height Increase of the Bottom Chord 144 m 3 /s 1.15 m 35.50 m 37.23 m 1.73m Platinum Gold Silver Verified
Transcript of BRIDGE ALTERNATIVES CLIENT - UNB
Timber Bridge
[3][1][2]
Existing Road Surface
Road Elevations
0%
10%
20%
30%
40%
50%
Resource
Allocation
Natural
WorldClimate and
ResilienceTOTAL
Quality
of Life
* Variance is due to some sub-criteria being subjective in evaluation
$1.00
$1.25
$1.50
$1.75
$2.00
$2.25
$2.50
-10 0 10 20 30 40 50 60 70
Mill
ions
Year of Service
Lifecycle Costs
End o
f D
esig
n L
ife
(7
5 Y
rs.)
Constr
uctio
n C
osts
Bridge DetailsBridge
Type
Beams DeckBarriers
(TL-4/PL-2)
Lateral
Bracing #
of
Depth
(mm) Type
Depth
(mm) Type
Concrete 5 1000
New
England
Bulb Tees225
Reinforced
Concrete
New-Jersey
ShapedNone
Steel 5 923W920x313
I-Beam
Alaskan
Multi-State
Railing
K-Bracings
near
supports
Timber 9 1330Glued-
Laminated235
Transverse
Glued-
Laminated
With Floor
Beams
Crash Tested
Timber
Barrier
4 Sets of
Timber
Diaphragms
BackgroundBay du Vin Bridge no. 5 located south-east of Miramichi is in need of replacement due
to high water elevations damaging the bottom of the bridge, along with inadequate
dimensions with respect to TAC standards.
Cost EstimateBridge Type Concrete Steel Timber
Design $ 99,000 $ 120,000 $ 135,000
Construction $ 1,229,000 $ 1,495,000 $ 1,683,000
Low Estimate $ 860,000 $ 1,047,000 $ 1,178,000
Cost $ 1,328,000 $ 1,615,000 $ 1,818,000
High Estimate $ 1,843,000 $ 2,243,000 $ 2,624,000
Operation & Maintenance
(Present worth of 75 year life)$ 40,000 $ 45,000 $ 151,000
Sustainability AssessmentA sustainability assessment was completed using the Envision credit system provided by
the Institute for Sustainable Infrastructure where material and infrastructure were
evaluated.
BRIDGE ALTERNATIVESDESIGN & MATERIAL COMPARISON
PREPARED BY: 2020 BRIDGEWORKS
RYAN BRENNAN, L. ROBERT ELLIOTT, DIKSHAIYE MATHOORAMATTHEW STEPHENS , NICHOLAS THIBODEAU
CLIENT:SUSAN MAYO, P.ENG.NEW BRUNSWICK DEPARTMENT OF TRANSPORTATION AND INFRASTRUCTURE
Existing Bridge
Goal and ObjectivesNBDTI has requested the design of three alternative bridges to replace Bay du Vin Bridge no.
5 utilizing steel, concrete or timber to serve as a feasibility study between the three materials.
This was achieved by completing the following objectives:
▪ Determination of the new bridge elevation to accommodate future high water.
▪ Design of the timber, steel and concrete bridges in accordance with CSA-S6 along with
realignment of the approaching roads.
▪ Sustainability & lifecycle cost assessment for comparison of the building material.
Summary of Results
From the analysis, 2020 Bridgeworks concludes:
• An expected high water elevation rise of 1.15m for a 1 in 100-year event while
considering climate change.
• Timber was found to be most sustainable; however, has an increased lifecycle cost.
• Steel and concrete resulted in similar maintenance costs with timber requiring additional
intermediate repairs.
• Concrete resulted in the lowest total cost followed by steel and timber, respectively.
Steel Bridge
Concrete Bridge
Road Work
Bridge TypeSurface Elevation Increase
(m)Total Fill Volume (m3)
[1] Concrete 1.58 295
[2] Steel 1.49 165
[3] Timber 2.12 1135
New High-Water Elevation
Predicted
Peak Flow
Predicted Raise
in High Water
Elevation
Bottom of
Existing Bridge
Elevation
Bottom of
Proposed Bridge
Elevation
Proposed Height
Increase of the
Bottom Chord
144 m3/s 1.15 m 35.50 m 37.23 m 1.73m
Platinum
Gold
Silver
Verified
