senior design presentation - winter term
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Pine Road over Pennypack Creek Senior Design Team 26
Matan Alexander, Gary Reiff, Derek Zaccheo, Cassandra Pruefer, & Steven Kreeley Faculty Advisor: Dr. Ivan Bartoli Technical Advisors: Dr. Emin Aktan and Mr. Benjamin Cohen, E.I.T.
80’
Outline • Problem Statement
• Background
• Modeling
• Utilities
• Hydrology and Hydraulics
2
• Life Cycle Cost Assessment
• Alternatives
• Future - Continuing Work
• Conclusion
Problem Statement
• Deterioration
• Load reduction
• Emergency retrofit
• Consideration of different alternatives
• Recommend efficient long term solution
3
Background - Location
4
Project Location
Drexel University
Project Location
Project Location
Background - Structural Description
• Single span, 80 feet long
• Two lanes of traffic
• 44 foot wide roadway
• 82° abut. skew to road
• North-south orientation
• Reinforced concrete deck
• 8 weathering steel girders 5
Background - Future and Community Impact • Desire of increasing public transit and
commercial revitalization
• Goal to alleviate traffic congestion
• Current heavy use of bus/train
• Upkeep of retail and industrial parks an issue
• Growing trend of single to multi-family home conversions
6
Project Location
Project Location
Community Impact - Potential Detour Route • Total distance of
approximately 2.36 miles
• Emergency Response Located on either side of the structure
• Verree Road (SR 1001) bridge also allows for mounted police patrol
7
Project Location
Background-Inspections and Current Condition
• Last City inspection: June 18th, 2014
• Team site visit: Nov. 18, 2015
• Deck: cracking on parapets, spalling, and potholes on deck
• North expansion joint in poor condition
8
Superstructure Inspection • Eight W33x130 girders with cross
braces
• Section loss evident on girders
• Rusting of cross braces & bearings
9
Substructure Inspection • Both abutments have 3-4” settlement
10
• South abutment - minor cracking, delamination of bridge seats
• North abutment - cracked pedestals, pooling water behind bridge seats
Modeling - AutoCAD • Developed a model to import into SAP2000
• Combination of shell elements (bridge deck), frame elements (beams), and rigid links
• Only superstructure
11
Modeling - SAP2000 • Current condition
• Application of loads and load cases
• Results:
• L/800 deflection
• Stress
12
Utilities • PWD - 20” Main
• PGW - 8” Main
• 10” sewer and 42” storm sewer run under creek - encased in concrete
13
Hydraulics and Hydrology
14
• Downstream of structure looking downstream
Peak Flow Rates
15
Hydrologic Analysis
16
Hydraulic Analysis
• Normal Clearance 12’-3”
• 100-yr Clearance 12’-8”
• 500-yr Clearance 15’-4 ½”
• Lift Low Chord 6”
17
HY-8 Output Table
18
19
Life Cycle Cost Assessment
• Maintenance Records
• Present Net Worth 20
Pine Road over Pennypack Creek
Wyoming Avenue over Frankford Creek
Do Nothing Alternative
• Structure in a state of deterioration
• Average weight of garbage truck is 32 tons
• Impact on community and environment
21
Repair Alternative • Deterioration of structure due to drainage
design flaws
• Replace beam ends, deck, and bearings
• Very expensive to install temporary supports
22
Rehabilitation Alternative
• Fix abutment for settlement issues
• Fix drainage issues
• Hydraulic considerations
23
Replacement Alternative • Need to lift bridge above 100 year storm
• Completed Scupper Design Calculations
• Fix drainage design issues by adding expansion joint
• Abutment to Approach Slab
• Fix settlement issues
• Propose Prestressed Concrete Beams
24
Structural Design - Material Considerations
25
Current: Weathering Steel Proposed: Prestressed Concrete • Performs better under wet
conditions • Low maintenance • Less expensive than
weathering steel
• Forms patina • Poor performance under wet
conditions • Not recommended in areas
wetter greater than 60% of the time
8 - Beam Configuration
• 80’ long
• 8” Deck
• 36” Top Flange
26
6 - Beam Configuration • 80’ long
• 8” Deck
• 48” Top Flange
27
28
Schedule to Date
29
Expected Future Schedule
Design Budget
30
Future - Continuing Work
• Completion of Superstructure design
• Geotechnical Analysis
• Abutment Design
• Transportation Design
• Modeling
• Life Cycle Cost Assessment
31
Conclusion
• Bridge is necessary for community
• Recommend replacement alternative
• Modeling
• Accounted for hydrologic impacts
• Structural design calculations
• Looked into life cycle cost assessment
32
Questions?
33
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