Design and Construction Considerations of Reinforced Concrete Structures for Water Utilities April 12, 2007 1 DESIGN & CONSTRUCTION CONSIDERATIONS OF REINFORCED CONCRETE STRUCTURES FOR WATER UTILITIES Maine Water Utilities Association Apr il 12, 2007 Michael E. Malenfant, P.E. Metcalf & Eddy 2 CONTENTS • Intr oduc tio n • Exa mple s of re infor ced c oncrete structures for water utilities • Adv antag es of re infor ced c oncr ete structures • Disa dvan tage s o f re info rced concrete structures • Desig n conside rat ions • Con struc tion cons idera tions • Summary 3 INTRODUCTION • In 190 7, Leo nard Metca lf, a Bos ton civ il engineer whose specialty was water supply issues, and Harrison Eddy, superintendent of the sewer department in Worcester, Massachusetts , were introduced by a professor at Worcester Polytechnic. Shortly thereafter , they decided to join forces and create an environmental engineering firm called Metcalf & Eddy.
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
DESIGN & CONSTRUCTION
CONSIDERATIONS OF
REINFORCED CONCRETESTRUCTURES FOR WATER
UTILITIES
Maine Water Utilities Association
Apr il 12, 2007
Michael E. Malenfant, P.E.
Metcalf & Eddy
2
CONTENTS
• Introduction
• Examples of reinforced concrete
structures for water utilities
• Advantages of reinforced concrete
structures
• Disadvantages of reinforced
concrete structures
• Design considerations
• Construction considerations
• Summary
3
INTRODUCTION
• In 1907, Leonard Metcalf, a Boston civilengineer whose specialty was water supply
issues, and Harrison Eddy, superintendent of
the sewer department in Worcester,Massachusetts, were introduced by a
professor at Worcester Polytechnic. Shortlythereafter, they decided to join forces andcreate an environmental engineering firm
called Metcalf & Eddy.
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
4
Wilmington, Delaware
•10 million galloncovered waterstorage tank
•Underconstruction,
completionDecember 2007
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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Atlanta, Georgia
•Complex ofthree coveredwater storagetanks
•Age from 10years to 80
years
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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Framingham, Massachusetts
•115 million gallon covered water storage tank
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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Macon, Georgia
•1.8 million gallonpartially buried
covered water
storage tank
•Constructed in1920
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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ADVANTAGES
• Easily adaptable to a myriad of different
shapes & architectural treatments• Many contractors have the capability to place
reinforced concrete
• Reinforced concrete contractor will likelyalready be on site
• Durability
• Proven track record of over 100 years
20
DISADVANTAGES
• Owner preferences may dictate against usingreinforced concrete
• Cost considerations due to quantity ofmaterials required
• Construction nuances
• Cracking & durability
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DESIGN CONSIDERATIONS
• Seismic loads
• Floatation
• Abnormal pressure loads
• Retaining elements• Influence of adjacent / superimposed structures
• Integration into existing facilities
• Security
• Details, Details, Details!
• Liner systems
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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SEISMIC LOADS
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SEISMIC LOADS
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SEISMIC LOADS
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Design and Construction Considerations of
Reinforced Concrete Structures for Water
Utilities
April 12, 20
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SEISMIC LOADS
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SEISMIC LOADS
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BUOYANCY
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design, placement,and curing practicesis the single mostimportant factor
toward the long-termdurability of thestructure.
56
SUMMARY
• Reinforced concrete is not a “forever” material.It requires on-going care and maintenance. Awell-defined asset management program willcontribute to the long-term operation of thestructure.