JIM NELSON, IOWA DOT MASSENA LATERAL BRIDGE SLIDE CASE STUDY
Feb 25, 2016
J I M N E L SO N , I O WA D O T
MASSENA LATERAL BRIDGE SLIDE CASE STUDY
PROJECT LOCATION
• IA 92 over Small Natural Stream, 1.0 mile west of Jct. IA 148
PROJECT LOCATION
EXISTING STRUCTURE
• 40’ x 30’ Steel I-beam• Constructed 1930• Reconstructed
1949• Overlay 1968• Retrofit rail 1992• Overlay 1998
EXISTING STRUCTURE
• Structurally deficient – sufficiency rating is 38.2• Bridge is not
adequate for legal loads – posted “One truck at a time.”
PROPOSED REPLACEMENT BRIDGE
• Pretensioned Prestressed Concrete Beam Bridge
MOBILITY IMPACTS
• Detour traffic for duration of construction• 7 miles out of distance travel for detour• AADT (2012) – 1,460 w/ 16% trucks• User costs for 180 day detour• Indirect $437,000• Direct $15,000 (Co. Road Maint. & Detour
Signing)
PROJECT STAGING AREA
UTAH DOT WANSHIP BRIDGE SLIDE
BRIDGE CONSTRUCTION VISUALIZATION
SEMI-INTEGRAL ABUTMENT
• Abutment Diaphragm Details – sheet number 14
SLIDING PAD
• Superstructure Details – sheet number 15• Bonded PTFE surface on bearing pad detail
PROJECT COST
• Let April 16, 2013
• Winning bid $1.3 Million
• Bridge unit cost - $112/SF
• Historic bridge unit cost - $85/SF
CRITICAL CLOSURE SCHEDULE
Activity 1 2 3 4 5 6 7 8 9Bridge Removal and GradingPavement RemovalRevetmentPile DrivingAbutment FootingBridge slidePrecast wingsBarrier RailingGranular BackfillApproach pavingLongitudinal GroovingSteel GuardrailPavement Marking
Day
MASSENA LATERAL BRIDGE SLIDE WEB SITE
CONSTRUCTION PROGRESS
ACKNOWLEDGEMENTS
• Designer – Iowa DOT• Constructability Review – Michael Baker
Corporation• ABC Peer Exchange – Utah DOT• ABC Detail Testing – Iowa State University• Construction Administration – Iowa DOT• Prime Contractor – Herberger Construction Co., Inc.• Precast Wing Supplier – Cretex Concrete Products• Precast Beam Supplier – Cretex Concrete Products• HfL Grant – FHWA