Rehabilitation of a Two Lane Covered Bridge Presented to:
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1 Rehabilitation of a Two Lane Covered Bridge Presented to: Second National Covered Bridge Conference June 6, 2013 Presented by: Sean T. James, P.E. Project Manager (sjames@hoyletanner.com) Josif Bicja, P.E. Project Engineer (jbicja@hoyletanner.com) Manchester, NH USA
2 Background Bridge Description Project Purpose and Need Structural Analysis Presentation Outline Geometric Limitations / LoadCases/ Live LoadSelection Computer Model Arch Interaction Observations & Results Proposed Modifications Rehabilitation ti Project
3 Background Project Location
4 Background 5 Remaining Double Barrel Covered Bridges Roberts Covered Bridge, Eaton OH, 1829, 79 Long Single Span, Multiple Kingpost w/arches, Pedestrian Only. Ramp Creek Covered Bridge, Nashville IN, 1838, 96 Long Single Span, Multiple Kingpost w/arches, Vehicular. Philippi hl Covered Bridge, Philippi hl WV, 1852, 286 Long Four Span, Long Truss, Vehicular. Shelburne Museum Covered Bridge, Shelburne VT, 1845, 168 Long Single Span, Multiple Kingpost w/arches, Pedestrian Only. Pulp Mill Covered Bridge, Middlebury/Weybridge VT, 1853, 200 Long Three Span, Multiple Kingpostw/Arches w/arches, Vehicular.
5 Background Pulp Mill Covered dbid Bridge Frequently Cited Built From 1805 and 1820 VTrans Record Built in 1853 National Register of Historic Places in Sept. 10, 1974 AADT Volume of 1,900 Vehicles Originally Built as 180 Single Clear Span, Extensive Sagging Nail Laminated Wood Arches Added in Two Stone Masonry Piers with Timber Cribbing in Late 19 th Century
6 Mj Major Rehabilitation ti in Background Stone Masonry Piers Encased in Concrete New Concrete Facing of Abutments and New Backwalls Portions of Arches and Truss Bottom Chords Replaced New Steel Hanger Rods Added to Connect the Arches to the Bottom Chord at Each Panel Point New 6 x 6 Pressure Treated Lower Lateral Braces Installed North Truss and Arch (West Span) Rehabilitated in 1991 Interior Truss and Arch (East Span) Rehabilitated in 2002 A Pedestrian Bridge Constructed in Mid 1990 s Mid 1990s
7 200, 3 Span Continuous, over Otter Creek M. Kingpost Trusses w/arches 3 Trusses, 4 Arches 2 Lanes, 8 6 Wide Curb Curb, 26 Out Out 10 6 Vertical Clearance 4 Tons Live Load Capacity Goal Bridge Description
8 Upstream Elevation Bridge Description Downstream Elevation
9 Bridge Description West Approach East Approach
10 Roof Framing Bridge Description
11 Bridge Description Upstream Barrel Downstream Barrel
12 Bridge East Pier & Floor Framing Bridge Description
13 Bid Bridge in Poor Condition Project Purpose and Need Broken, Rotted, Impact Damaged Members Truss Vertical Member Issues Previous Repairs Sag in Truss Spans Snap Through Buckling of Arches Preserve Historic Covered Bridge Critical Link Between Towns
14 Project Purpose and Need Member Split Member Split Member Impact Damage
15 Project Purpose and Need Rot Break Break
16 Project Purpose and Need Broken Tenon Truss Vertical Broken Tenon Truss Vertical
17 Project Purpose and Need Undersized Verticals At Notch
18 Project Purpose and Need Split Verticals
19 Previous Repairs Project Purpose and Need
20 Geometric Limitationsit ti Structural Analysis Lane Width of 8 6 Vertical Clearance 10 Center, 8 Edge Allowable Stress Rating and Design Load Cases Dead + Inventory Dead + Live + Operating
21 Live Load Lane Load Evaluated H4 (4 Tons) Truck Train 5 Load Cases, Both Lanes Loaded 3D Computer Model Structural Analysis
22 H4 Load Cases Structural Analysis Three-Dimensional Computer Simulation of the Pulp Mill Covered Bridge - Unloaded
23 Arch Interaction / Condition Structural Analysis
24 Observations & Results Poor Connection Capacity of Vertical to Chord Structural Analysis 3 Span Configuration Results in Member Stress Reversals Load Sharing of Trusses and Arches Critical Relative Stiffness Determined to Share Load Limited by Bolted Connection Live Load Stresses Approx % of Dead Load Stresses Most Members Controlled by Multiple Truck Load Case
25 Structural Analysis Proposed Modifications to the Interior Truss Legend: 5 x5 Timber ½ Steel Rod Solid Blocking
26 Rehabilitation Project Three Ends of Arches Rebuilt Several Truss Member Replaced or Repaired due to Strength & Condition All Arch Hanger Rods Removed Connections o of Arches esto Verticals etcasstrengthened e ed Bottom Chord Replaced Reversible Modification to Interior Truss Several Roof Rafters Replaced In Kind or Sistered
27 Rehabilitation Project New Upper Lateral Bracing Installed Several Knee Braces and Cross Beams Replaced In Kind All Stringers Removed Several Floor Beams Replaced In Kind Existing Decking Replaced Limited New Lateral Bracing Installed New Wood Curb Installed
28 Trusses and Arches Realigned Protectowire and Lighting Installed FireRetardant/Insecticide Coatings Applied Minor Approach Work Minor Repairs to Existing Substructure Total Construction Cost $1.7 Million Rehabilitation Project
29 Rehabilitation Project Temporary Shoring System Above the Deck Temporary Shoring System Below the Bridge
30 Rehabilitation Project New Bottom Chord New Truss Verticals
31 Rehabilitation Project Sistered Roof Rafters Rebuilt East End of North Arch
32 Rehabilitation Project Fire Detection Wires Underside of Bridge Typical Floor Framing at Arch Locations
33 Rehabilitation Project Ribbon Cutting Ceremony November 9, St Car to Cross the Bridge November 9, 2012
34 Question & Answer Rehabilitation Project Sean T. James, P.E. PE (j lt Josif Bicja, P.E. PE com) 150 Dow Street Manchester, NH 03101
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