WSDOT s Approach to Seismic Retrofit of Highway Structures

Transcription

1 WSDOT s Approach to Seismic Retrofit of Highway Structures Role of the Lifeline Route in Reducing Network Risk Lynn Peterson Secretary of Transportation Patrick Morin, PE Capital Program Development & Management Office Puget Sound Regional Council Transportation Policy Board Meeting November 13,

2 Seismic Faults in Washington 2

3 Seismic Ground Acceleration Zones When seismic faults slip, vertical and horizontal ground motion is created Seismic professionals describe this motion in terms of the speed at which the ground accelerates Engineers design structures to handle the forces generated by the acceleration. 3

4 WSDOT s Three-Phase Seismic Plan Objective: Strengthen structural elements that are vulnerable to damage from ground motion (generally west of Moses Lake) Phase 1 Secure superstructure to columns (potentially catastrophic) Phase 2 Rehab single columns (has no redundant support) Phase 3 Rehab multi-columns 4

5 Phase 1- Rehab Superstructure Superstructure collapse Superstructure restrainers I-5 Mainline bridge near Seattle 5

6 Phase 1- Rehab Superstructure Seismic Rehab for Horizontal Movement Girder Stop Reinforcement 6

7 Phase 2 & 3 Crossbeam & Column Retrofitting Seismic Retrofit of Crossbeam Picture of Column Bolster for Strengthening & Support 7

8 Phase 2 & 3 Crossbeam & Column Retrofitting Seismic Retrofit of Columns Picture of Steel Jacket on Column with a Grout Tube 8

9 Phase 2 & 3 Seismic Retrofitting - Columns Multi-column Retrofit (King Co & Snohomish Co) Single Column Retrofit (Woodinville Interchange) 9

10 Impact of Strong Ground Motion 6.6 Magnitude, San Fernando Earthquake February 9,

11 Bridge Pier Damage due to Vertical Acceleration 6.6 Magnitude, San Fernando Magnitude, Nisqually 2001 I-5 Beacon-Holgate Bridge in Seattle 11

12 Bridge Pier Damage due to Vertical Acceleration 1971 San Fernando Valley - California I-405 and SR522 Interchange 12

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14 Status of Seismic Rehab of WSDOT Bridges (King, Pierce, Kitsap & Snohomish Counties) 1000-Year Zone Complete (Phase 1 & 2 / 3) Partially Retrofitted ( Phase 1 ) Retrofit Required (Phase 2 or3) Under Contract (Phase 3) Grand Total Grand Total

15 Status of Lifeline Corridor Initiative In Puget Sound November 2014 Remaining bridges on the Lifeline Corridors In Puget Sound that still need additional seismic retrofitting of their columns and crossbeams (substructure) These structures will bed designed to resist the forces caused by ground motion for the largest predicted seismic event in 1000 years Three of these bridges have columns with hollow cores in their center

16 Investment in Stand Alone Seismic Rehab since $335.6 M (In 2014 dollars) 50 Million$ Inflated SWR OR O SWR SCR WSF OR 10 NWR HQ NCR AWV WSF SWR SCR OR NWR NCR HQ AWV 16

17 Phase 3 Rehab Multi-column Piers (The Challenge) 619 bridges remaining (statewide) - Total cost of ~ $1.2B 236 bridges remaining (Puget Sound) Seismic professionals revised design criteria from 500 Year MRI to 1000 MRI in 2007 Emergency response and recovery is top priority. Export/Imports comprise large percentage of state s economy. Securing a strategic freight corridor is key to economic recovery following a major earthquake. 17

18 Seismic Lifeline Route Development Coordinated with the following: Washington State Department of Emergency Management Washington State Seismic Safety Committee Dept of Natural Resources Geologists Federal agencies ( USGS, FEMA) County emergency planners (Pierce, King & Snohomish) City emergency planners (Tacoma, Seattle) WSDOT Freight Division 18

19 Row Labels Total Cost of Key Seismic Rehab in Puget Sound $678M of needs in Puget Sound with $10M per biennium identified in 10-Year Financial Plan would take until the end of this century December 2012 Collector Distributor Eastbound Northbound Northbound & Southbound Overcrossing & Ramp Reversible Lane Southbound Westbound Grand Total I-5/Lakewood to SR 18 $ 4,969,853 $ 13,421,259 $ 8,793,814 $ 27,184,926 I-5/SR 18 to I-405 and I-405 to SR 900 $ 17,065,026 $ 7,777,693 $ 12,632,455 $ 37,475,174 I-405/Seatacto I-90 $ 941,875 $ 4,324,661 $ 18,444,217 $ 1,263,867 $ 24,974,620 I-405/I-90 to SR520 $ 6,411,977 $ 732,743 $ 5,361,521 $ 12,506,241 I-405/SR 520 to Edmonds $ 1,651,155 $ 4,783,537 $ 2,085,710 $ 4,356,330 $ 12,876,732 I-5/I-90 to Mercer Street $ 18,329,036 $ 23,421,134 $ 15,227,861 $ 5,539,479 $ 62,517,510 I-5/Mercer Street to SR 522 $ 46,222,033 $ 33,464,915 $ 25,044,206 $ 86,427,539 $ 191,158,693 I-5/SR 522 to I-405 $ 728,002 $ 1,818,124 $ 3,964,873 $ 1,698,466 $ 8,209,465 I-5/SR 900 to I-90 $ 74,810,307 $ 29,033,763 $ 77,597,179 $ 181,441,249 I-90/Puget Sound $ 20,017,459 $ 45,345,828 $ 48,437,708 $ 113,800,995 SR 518 $ 800,734 $ 1,134,133 $ 1,934,867 SR 526 $ 4,611,365 $ 4,611,365 Grand Total $ 40,725,652 $ 46,146,562 $180,443,866 $ 4,324,661 $ 128,764,399 $ 25,044,206 $ 203,670,650 $ 49,571,841 $ 678,691,837 19

20 Gas tax purchasing power declines over time Gas tax not indexed to inflation and compelling communication is more important than ever Funding crisis Revenue significantly under projections Inflation increasing cost of maintenance and construction Challenge in getting another tax increase Includes maintenance, preservation, safety improvements, and other department operations. ** Less Debt Service. Source: WSDOT 20 20

21 Status of Lifeline Corridor Initiative (Mainline Roadways) I-5 / Lakewood to SR 18 Complete or under contract except for 1 bridge in Tacoma I-5 / SR 18 to I-405 & I-405 to SR 900 complete except for 1 hollow core bridge north of South Center I-405 / Seatac to Lynwood 20 phase 3 seismic retrofits remaining I-5 / I-405 to Everett is complete on the mainline I-5 / SR 522 to Lynwood 2 phase 3 seismic retrofits remaining 24 Phase 3 seismic retrofits remaining on the Lifeline Corridor Initiative for approximately $48 mil No additional funding planned for Phase 3 seismic retrofitting within 6-year Current Law budget Existing revenue will be used for higher priority needs which are increasing and may result in weight restrictions and roadway failures in the next few years without a revenue package WSDOT included funding to complete the Lifeline Corridor Network in the Unfunded Priority Proposal submitted to the Legislature by WSDOT One direction could be retrofitted for approximately $24 million 21

22 State Transportation Needs Exceed Future Funding ( WSDOT Priorities for New Revenue 2013 Unfunded System Investments) Highway System Maintenance - $414 million Operational Improvements - $82 million Highway Road Preservation - $1,819 million Highway Bridge Preservation - $504 million Highway Facility Preservation - $213 million Ferry Preservation - $636 million PCC Rail Preservation - $50 million Highest Priority Highway Safety Projects - $350 million Fish Barrier Removal Projects - $2,400 million 22

23 Contact Info: PATRICK MORIN, PE OPERATIONS MGR, CAPITAL PROGRAM DEVELOPMENT & MGMT WASHINGTON STATE DEPT OF TRANSPORTATION

24 I do not plan to use the slides below this blank page 24

25 Restoring Performance Objectives with Sustainable Initiatives Lower cost approaches To improve performance To become more efficient than full scale replacement or upgrade Lower risk and tradeoffs Meet multiple goals with limited budget 25

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27 Lifeline Route Option That Meets Seismic Rehab Needs in Puget Sound Segment Direction Zone 35 Zone 40 Total $ (by No. of Bridges) I-5/Lakewood to SR 18 Northbound 2 $ $4,969,853 Southbound 2 $ 8,793,814 I-5/SR 18 to I-405 and I-405 to SR 900 Southbound 9 $ 12,632,455 I-405/Seatac to I-90 North/Southbound 1 $ 4,324,661 Southbound 1 $ 1,263,867 I-405/I-90 to SR 520 Southbound 4 $ 5,361,521 I-405/SR 520 to Edmonds Southbound 3 1 $ 4,356,330 I-5/SR 522 to I-405 Southbound 1 $ 1,698,466 Grand Total 3 21 $43,400,967 I-5/I-405 Southbound mainline-only option (no overpasses & no ramps) can be completed within 10 years for $43M. Northbound mainline-only option can be completed with $30M more. SR 99 route through Seattle via the Alaskan Way Tunnel and Aurora Ave Bridge will meet 1000-year seismic standards. 27

28 10 to 20-Year Forecast Are there other significant ground acceleration zones? Juan de Fuca coastal fault off of Gray Harbor. Phase 1 & 2 seismic retrofitting of bridges on the state routes to Grays Harbor from Olympia have been completed. Phase 3 multi-column retrofitting of bridges to secure a lifeline route remains to be done. The agency is discussing whether to secure a lifeline route to the coast, or retrofit other multi-column bridges in Puget Sound. 28

29 Legislative Direction for Building a Capital Transportation Program Legislative direction based on a 1993 Programming & Prioritization Study Program will be based on Legislative policy guidance Performance outcome focus will be based on Legislative policy A budget structure that promotes investment tradeoff decision-making Identify needs based on lack of transportation performance Develop & evaluate a range of alternatives for restoring performance Identify & evaluate risks & opportunities associated with these alternatives Approximate cost (Important when capital is limited) Predict performance outcome of alternatives Establish project prioritization based on change in performance per $ Recommend investment tradeoffs to maximize performance 29

30 Highway Construction Program PRESERVATION (P) Roadway (P1) Structures (P2) Other Facilities (P3) Program Support (P4) Paving Preservation Rest Areas Unstable Slopes Safety Restoration Catastrophic Reduction Weigh Stations Major Drainage & Electrical IMPROVEMENT (I) Mobility (I1) Safety (I2) Economic Initiatives (I3) Environmental Retrofit (I4) Program Support (I5) Urban Rural Urban Bicycle Core HOV Collision Reduction Collision Prevention All Weather Rest Areas (In Safety) Scenic Byways Freight System Stormwater Fish Barriers Noise Reduction Air Quality Chronic Env Deficiency Wildlife Connectivity Mgmt of Environmental Mitigation Sites Restricted Bridges Bicycle Touring Strategy no longer active 30

31 Cost of Construction Averaged 4% between 1970 and OPEC Oil Embargo nd OPEC Oil Crisis Material Cost increase Construction Cost Index Q Q Q Q Q Q 31

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