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ASHFORK-BAINBRIDGE STEEL DAM STRUCTURAL
EVALUATION PROJECTDWP Engineering
Diwei Chen Wen Cui
Paul Garrett
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VIEW OF STEEL DAM
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Background
Original drawings of Ashfork-Bainbridge Dam (Bureau of Reclamation)
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• Designed by Francis H. Bainbridge and built in 1898 by the Atchison, Topeka, and Santa Fe Railway Co.
• First large steel dam in the United States
• 46 feet high, 300 feet long and has the elevation of 5,402 feet.
• It was designed as a cantilever truss with anchorage at the upstream toe.
• 26 square miles drainage area and a gross capacity of 400 acre-feet
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PurposeThe goal of the project is to evaluate the structure health of the Ashfork-Bainbridge Steel Dam in order to classify the current hazard potential of the dam.
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Stakeholders
• The National Forest Service
• Community of Ash Fork, Arizona and occupants of Monte Carlo Truck Service.
• Arizona Department of Transportation
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• Studies completed as recent as 2009, by Technical Service Center, rated the dam as low hazard. 1
• No maintenance has been performed on the dam in recent years.
2
• Recommendations made by previous analyses may be outdated3
Existing Conditions
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Service Details• Task 1- Research
• Task 2- Site Visit
• Task 3- Evaluation Methods
• Task 4- Technical Evaluation
• Task 5- Reevaluation Of Hazard Potential
• Task 6- Report Findings
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• Task 1 - ResearchExisting materials provided by National Forest Service:
• original design drawings
• maintenance records
• emergency action plans
• and engineering studies
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• Task 2 - Site visit
1. All existing concerns previously noted will be located and confirmed.
2. Any issues will be documented with pictures and a detailed description.
3. major rust locations and reservoir water levels will be documented and recorded.
4. Check for signs of scour and seepage.5. A detailed as-built sketch will be created.
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• Task 3 – Evaluation Method
Reference Codes: – Arizona Dam Safety– U.S Army Corps of Engineering
These evaluation guidelines will provide the design team with a proper methodology for
evaluating the dam.
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• Task 4 – Technical Evaluation
1. Hydraulic Analysis– Overtopping– 100- year flood– Normal loading
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Task 4 – Technical Evaluation
2. Geotechnical Analysis– Bearing capacity analysis
3. Seismic Analysis– Seismic analysis will be
based on evaluation guidelines
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Task 4 – Technical Evaluation
4. Structural Analysis– SAP 2000 Analysis :
overall dam deflection and individual member maximum loads.
– Testing rusted steel and broken parts
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Task 5 – Reevaluation of Hazard Potential
According to definition of hazard potential mode, written on the old reports, different potential hazard failure mode will be checked by calculation and model analysis.
A hazard potential rating will be developed.
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• Task 6 – Report Finding
Final report prepared for the Client:
1. Suggested hazard classification2. Potential failure modes : cost estimation for
repair/restoration of most eminent failure.3. Model analysis and calculation results will be provided
to support the recommendation.
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Potential Challenges• Modeling the steel
dam for analysis• Assessing scour on
dam• Quoting for
accurate cost
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Project Duration:
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Tasks Duration Detail
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Questions?
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