Engineering & Capital Improvements Shore Acres Civic - - PowerPoint PPT Presentation

Engineering & Capital Improvements

Shore Acres Civic Association August 21st, 2017

• 40th Avenue N Bridge
• 34th Avenue NE Storm Drainage Improvements
• Resiliency Planning
• Continued Maintenance

40th Avenue Bridge

• 1960 – Bridge was constructed, and widened in 1991
• Bridges inspected on a Bi-Annual Cycle by State Transportation Department (FDOT)
• 07/20/11 – FDOT Bi-Annual Inspection
• Sufficiency rating 78.5% (Scale of 0-100%)
• Nation Bridge Index (NBI scale of 0-9)
• Superstructure

6 (satisfactory)

• Substructure

5 (fair)

• 07/29/13 – FDOT Bi-Annual Inspection
• Sufficiency rating 79.5% (Scale of 0-100%)
• Nation Bridge Index (NBI scale of 0-9)
• Superstructure

6 (satisfactory)

• Substructure

5 (fair)

• 07/31/15 - FDOT Bi-Annual Inspection
• Sufficiency rating 72.7% (Scale of 0-100%)
• Nation Bridge Index (NBI)
• Superstructure

6 (satisfactory)

• Substructure

5 (fair)

40th Avenue Bridge (Sufficiency Rating)

• Sufficiency Rating (SR), as defined in the Federal Highway Administration's (FHWA) Recording and

Coding Guide for the Structure Inventory and Appraisal of the Nation’s Bridges

• SR of 80 or below - Rehabilitation
• SR of 50 or below – Replacement
• SR (2011)

78.5%

• SR (2013)

79.5%

• SR (2015)

72.7%

40th Avenue Bridge (National Bridge Index Number)

• Structural Deficient - Defined by 23 CRF 650 D – Code of Federal Regulation – Highway Bridge

Replacement and Rehabilitation Program

• Deck, Superstructure, Substructure or Culvert – 4 or less
• Structural Condition and/or Waterway Adequacy – 2 or less
• Very low inventory load rating and bridge requires replacement
• Frequent flooding that causes traffic delays
• Structural Deficient does not necessarily mean unsafe!
• When found to be structurally deficient, FDOT recommends that a bridge should be scheduled to

undergo a series of repairs or replacement within six (6) years.

• 2011, 2013 & 2015 -

Superstructure was rated at 6 (Satisfactory) Substructure was rated at 5 (Fair) NOT considered structurally deficient based on biannual FDOT inspections.

40th Avenue Bridge (National Bridge Index Number)

• Functionally Obselete- Defined by 23 CRF 650 D – Code of Federal Regulation – Highway Bridge

Replacement and Rehabilitation Program

• Deck Geometry, Underclearances, Approach Roadway Alignment – 3 or less
• Structural Condition and/or Waterway Adequacy - 3
• The bridge does not meet current road design standards. For example, some bridges are "functionally
• bsolete" because they were built at a time when lane widths were narrower than the current standard.
• 2011, 2013 & 2015 -

Superstructure was rated at 6 (Satisfactory) Substructure was rated at 5 (Fair) NOT considered functionally obsolete based on biannual FDOT inspections.

40th Avenue Bridge

• In February 2016, an independent study prioritized bridges within the City for replacement within

the next ten (10) years. This bridge, based on its’ condition assessments was not ranked as in need of replacement.

• Based on FDOT Inspections – Bridge was scheduled for maintenance/rehabilitation repairs
• 08/07/17 – Initiated maintenance on concrete spall repair
• 08/10/17 – Requested follow up inspection due to extensive corrosion uncovered after spalled concrete

was removed

• 08/11/17 – Bridge closure to create alternate traffic flow – Original portion of center span demonstrated

extensive corrosion

• 08/12/17 – FDOT re-inspected the structure due to subsurface conditions and will revise the biannual

inspection report

• In summary, industry standard practices followed by the FDOT and the City did not reveal, what we

were able to observe during the removal of loose, degraded concrete, which exposed the extent of the corrosion.

40th Avenue Bridge

40th Avenue Bridge

40th Avenue Bridge

• Proposed – Alternate traffic

pattern would allow indepth inspection of corroded sections to determine repair feasibility

40th Avenue Bridge

Saltwater penetration into voids resulting in corrosion of reinforcement

• Proposed – Continue discussions with FDOT to place structure on their list for replacement

34th Avenue NE Storm Drainage Improvements

Joint Project between the Southwest Florida Water Management District (SWFWMD) and the City of St. Petersburg to reduce flooding and increased water quality.

• 08/10/17

– Pre-Bid Meeting

• 08/29/17

– Deadline for Bids

• 10/17
• Contract Award
• 11/17
• Contract Execution
• 12/17
• Construction Start (210

Days)

• 07/18
• Construction Complete

Resiliency Planning

• Included in the City’s Proposed Budget for FY 18
• Task Force Committee comprising of City Staff from:
• Office of Sustainability
• Engineering & Capital Improvements
• Stormwater, Pavement & Traffic Operations
• Legal
• Economic Development
• Codes
• Building Permitting
• Risk Management

Resiliency Planning

• Will be coordinated with the Pinellas County Integrated

Sustainability Action Plan

• Task Force will work to identify elements of the Scope of Work for

an Architect/Engineer firm:

• Revision to ordinances
• Design policies and procedures
• City Standards for construction
• To be used to address:
• Sunny day flooding due to high tide
• Adjusting street and gutter elevations
• Finish seawall elevations

Resiliency Planning

• Sunny Day Flooding

Resiliency Planning

• Checkmate Valve
• Tideflex Valve