Sexton Structural Consulting Group Kelly Hines -Brian ...
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Varner No.2 Bridge Replacement Project Department of Civil and Resource Engineering INTRODUCTION The existing Varner No.2 bridge is located in New Germany, Nova Scotia. The one-lane bridge spans 47.5-m across the LaHave River. The bridge structure consists of a steel truss superstructure which is supported on concrete abutments. There is also a three span pedestrian bridge located on the downstream side which is supported by two piers and the same abutment system used by the vehicle bridge. PROJECT SCOPE The project team was tasked to complete a full design of the planned replacement bridge. Base deliverables included: preliminary design, concept selection proposal, structural design, construction drawings, construction schedule and cost estimate. REFERENCES • CBCL Ltd. 2018. Varner #2 Bridge Replacement Project Scope. 1489 Hollis St, Halifax, NS, 4pp. • CHBDC CSA S6-14. 2014. Canadian Highway Bridge Design Code. The 11th edition. Published in December 2014 by CSA Group. 5060 Spectrum Way, Suite 100, Mississauga, ON, 894 pp. • Civil 3D 2016 Metric [Computer Software]. Autodesk, Inc. San Rafael, CA, USA. • Google Maps. 2019. HWY 208, New Germany, NS. Retrieved March 20, 2018. • SketchUp. 2019 [Computer Software]. Trimble Inc. Sunnyvale , CA, USA. Sexton Structural Consulting Group Kelly Hines - Brian Howell - James Wang - Banghe Yue DETAILS OF DESIGN CBCL Ltd. DESIGN PROCESS CONCEPT SELECTION LOADING ANALYSIS SUPERSTRUCTURE DESIGN SUBSTRUCTURE DESIGN CONSTRUCTION WORK PACKAGE Research design proposals Develop preliminary designs Prepare formal options analysis report Identify loading sources Research geographic parameters Determine governing load cases Design girder elements for construction loading Design bridge deck for composite action Design lateral load resisting system Design bridge abutments Design wingwalls Design approach slab Draft construction drawings Complete quantity take-off & Class A cost estimate Develop construction schedule CONCLUSION AND RECOMMENDATIONS The Varner No.2 bridge replacement is a two-lane highway bridge with pedestrian access designed in compliance with the CSA S6-14 standard. The slab-on-girder system spans 55-m over the LaHave River. The superstructure consists of four steel plate girders and is structurally composite with the 225-mm reinforced concrete deck. The lateral load resisting system is comprised of steel angles arranged in a cross pattern located every 7.85-m along the span. The substructure is a semi-integral abutment system with wingwalls arranged in a U-pattern. The abutment and wingwall units are designed to rest on the in-situ pyritic slate bedrock. A detailed quantity take-off was completed to support the development of a Class A cost estimate which indicated a $4.1M construction cost. COST ESTIMATE Earthworks $ 1,000,000 Bridge Structure $ 2,520,000 Asphalt Surface $ 28,000 SUBTOTAL $ 3,548,000 Design Development Contingency (5%) $ 180,000 Construction Contingency (10%) $ 350,000 TOTAL BUDGET AMOUNT $ 4,078,000 Above: Bridge cross section and abutment detail (AutoCAD Civil 3D, 2019). Above: Girder detail (AutoCAD Civil 3D, 2019). Above: Bridge span profile (AutoCAD Civil 3D, 2019). Above: Deck slab and shear connector detail (AutoCAD Civil 3D, 2019). 0 70 135 192 241 277 298 303 298 277 241 192 135 70 0 0 55 CL at Abutment Bearing Bridge Span Length (m) CAMBER DESIGN (EXT. GIRDER) 0 24 47 67 84 97 104 106 104 97 84 67 47 24 0 0 55 CL at Abutment Bearing Bridge Span Length (m) TOTAL DEAD LOAD DEFLECTION (EXT. GIRDER) 0 9 17 25 31 35 38 39 38 35 31 25 17 9 0 0 55 CL at Abutment Bearing Bridge Span Length (m) BARE STEEL DEFLECTION (EXT. GIRDER) A special thank-you to Dr. Yi Liu (Dalhousie University) and Mr. Colin Jim (CBCL Ltd). (SketchUp, 2019)
Transcript of Sexton Structural Consulting Group Kelly Hines -Brian ...
Varner No.2 Bridge Replacement ProjectDepartment of Civil and Resource Engineering
INTRODUCTIONThe existing Varner No.2 bridge is located in New Germany, Nova Scotia. The one-lane bridge spans 47.5-m across the LaHave River. The bridge structure consists of a steel truss superstructure which is supported on concrete abutments. There is also a three span pedestrian bridge located on the downstream side which is supported by two piers and the same abutment system used by the vehicle bridge.
PROJECT SCOPEThe project team was tasked to complete a full design of the planned replacement bridge. Base deliverables included: preliminary design, concept selection proposal, structural design, construction drawings, construction schedule and cost estimate.
REFERENCES• CBCL Ltd. 2018. Varner #2 Bridge Replacement Project Scope. 1489 Hollis St, Halifax,
NS, 4pp.
• CHBDC CSA S6-14. 2014. Canadian Highway Bridge Design Code. The 11th edition. Published in December 2014 by CSA Group. 5060 Spectrum Way, Suite 100, Mississauga, ON, 894 pp.
• Civil 3D 2016 Metric [Computer Software]. Autodesk, Inc. San Rafael, CA, USA.
• Google Maps. 2019. HWY 208, New Germany, NS. Retrieved March 20, 2018.
• SketchUp. 2019 [Computer Software]. Trimble Inc. Sunnyvale , CA, USA.
Sexton Structural Consulting GroupKelly Hines - Brian Howell - James Wang - Banghe Yue
DETAILS OF DESIGN
CBCL Ltd.
DESIGN PROCESS
CONCEPT SELECTION
LOADING ANALYSIS
SUPERSTRUCTURE DESIGN
SUBSTRUCTURE DESIGN
CONSTRUCTION WORK PACKAGE
Research design proposals Develop preliminary designsPrepare formal options analysis report
Identify loading sourcesResearch geographic parametersDetermine governing load cases
Design girder elements for construction loadingDesign bridge deck for composite actionDesign lateral load resisting system
Design bridge abutmentsDesign wingwallsDesign approach slab
Draft construction drawingsComplete quantity take-off & Class A cost estimateDevelop construction schedule
CONCLUSION AND RECOMMENDATIONSThe Varner No.2 bridge replacement is a two lane highway bridge with pedestrian access designed in compliance with the CSA S6-14 standard. The slab-on-girder system spans 55-m over the LaHave River. The superstructure consists of four steel plate girders and is structurally composite with the 225-mm reinforced concrete deck. The lateral load resisting system is comprised of steel angles arranged in a cross pattern located every 7.85-m along the span. The substructure is a semi-integral abutment system with wingwalls arranged in a U-pattern. The abutment units are designed to rest on the in-situ pyritic slate bedrock. A detailed quantity take-off was completed to support the development of a Class A cost estimate which indicated a $4.1M construction cost.
CONCLUSION AND RECOMMENDATIONSThe Varner No.2 bridge replacement is a two-lane highway bridge with pedestrian access designed in compliance with the CSA S6-14 standard. The slab-on-girder system spans 55-m over the LaHave River. The superstructure consists of four steel plate girders and is structurally composite with the 225-mm reinforced concrete deck. The lateral load resisting system is comprised of steel angles arranged in a cross pattern located every 7.85-m along the span. The substructure is a semi-integral abutment system with wingwalls arranged in a U-pattern. The abutment and wingwall units are designed to rest on the in-situ pyritic slate bedrock. A detailed quantity take-off was completed to support the development of a Class A cost estimate which indicated a $4.1M construction cost.
COST ESTIMATEEarthworks $ 1,000,000
Bridge Structure $ 2,520,000
Asphalt Surface $ 28,000
SUBTOTAL $ 3,548,000
Design Development Contingency (5%) $ 180,000
Construction Contingency (10%) $ 350,000
TOTAL BUDGET AMOUNT $ 4,078,000
Above: Bridge cross section and abutment detail (AutoCAD Civil 3D, 2019).
Above: Girder detail (AutoCAD Civil 3D, 2019).
Above: Bridge span profile (AutoCAD Civil 3D, 2019).
Above: Deck slab and shear connector detail (AutoCAD Civil 3D, 2019).
070
135192
241 277 298 303 298 277 241192
13570
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0 55CL
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Bridge Span Length (m)CAMBER DESIGN
(EXT. GIRDER)
0 24 47 67 84 97 104 106 104 97 84 67 47 24 0
0 55
CL
at A
bu
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eari
ng
Bridge Span Length (m)
TOTAL DEAD LOAD DEFLECTION(EXT. GIRDER)
0 9 17 25 31 35 38 39 38 35 31 25 17 9 0
0 55
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at A
bu
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t B
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Bridge Span Length (m)
BARE STEEL DEFLECTION(EXT. GIRDER)
A special thank-you to Dr. Yi Liu (Dalhousie University) and Mr. Colin Jim (CBCL Ltd).
(SketchUp, 2019)
