D115-17 Tendon-Prestressed Concrete Water Tanks · PDF fileiii Committee Personnel The AWWA Standards Committee on Concrete Water Tanks, Tendon-Type Prestressed, which reviewed and

AWWA Standard

SM

®

Tendon-Prestressed Concrete Water Tanks

Effective date: July 1, 2017.First edition approved by AWWA Board of Directors June 17, 1996.This edition approved Jan. 14, 2017.Approved by American National Standards Institute Feb. 17, 2017.

ANSI/AWWA D115-17(Revision of ANSI/AWWA D115-06)

Copyright © 2017 American Water Works Association. All Rights Reserved.

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Committee Personnel

The AWWA Standards Committee on Concrete Water Tanks, Tendon-Type Prestressed, which reviewed and approved this standard, had the following personnel at the time of approval:

Terrence P. Kenyon, Chair

General Interest Members

C. Badger, Bates Engineering Inc., Lakewood, Colo. (AWWA)R.T. Bates,* Bates Engineering Inc., Lakewood, Colo. (AWWA)S.R. Close, Close Associates LLC, Lakewood, Colo. (AWWA)T.P. Kenyon, Merrick and Company Inc., Denver, Colo. (AWWA)R. Kianoush, Ryerson University, Toronto, Canada (AWWA)F.S. Kurtz,† Standards Engineer Liaison, AWWA, Denver, Colo. (AWWA)D. Larson,† Standards Council Liaison, St. Louis, Mo. (AWWA)W.H. Peffley, Crawford, Murphy & Tilly, Springfield, Ill. (AWWA)T.R. Volz, AECOM, Denver, Colo. (AWWA)

Producer Members

J. Allen, Dutchland Inc., Gap, Pa. (AWWA)J. Anderson, VSL/Structural Technologies, Wheat Ridge, Colo. (AWWA)D.J. Beiler,* Dutchland Inc., Gap, Pa. (AWWA)A.J. Galterio,* VSL/Structural Technologies, Wheat Ridge, Colo. (AWWA)T.L. Neff, Post-Tensioning Institute, Farmington Hills, Mich. (PTI)B.A. Zavitz, Tindall Corporation, Conley, Ga. (AWWA)

User Members

D.O. Carroll, Aurora Water, Aurora, Colo. (AWWA)M. Garcia, Denver Water, Denver, Colo. (AWWA)K.L. Hill, Las Vegas, Nev. (AWWA)W.J. Horst, Montgomery County Environmental Services, Moraine, Ohio (AWWA)M.L. Wetzel, Town of Ayer Public Works Department, Ayer, Mass. (AWWA)

* Alternate† Liaison, nonvoting


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ContentsAll AWWA standards follow the general format indicated subsequently. Some variations from this format may be found in a particular standard.

SEC. PAGE SEC. PAGE

ForewordI Introduction .................................... vii

I.A Background ..................................... vii

I.B History ............................................ vii

I.C Acceptance ..................................... viii

II Special Issues. ................................... ix

II.A General ............................................ ix

II.B Site-Specific Conditions ................... ix

II.C Tendons ............................................ x

III Use of This Standard ......................... x

III.A Purchaser Options andAlternatives ................................. x

IV Modification of Standard ................ xii

V Major Revisions .............................. xiii

VI Comments ..................................... xiv

Standard

1 General

1.1 Scope ................................................ 1

1.2 Definitions ........................................ 1

1.3 References ......................................... 4

2 Materials

2.1 Concrete and Shotcrete...................... 7

2.2 Mixing Water .................................... 8

2.3 Admixtures ....................................... 8

2.4 Reinforcement ................................... 9

2.5 Ducts ................................................ 9

2.6 Sheathing ........................................ 10

2.7 Elastomeric Materials ...................... 10

2.8 Epoxy Bonding Agent ..................... 11

2.9 Shrinkage-Compensating Grout ...... 11

2.10 Concrete Coatings ........................... 11

2.11 Sealants ........................................... 12

3 Design

3.1 Notation.......................................... 12

3.2 Design Method ............................... 13

3.3 Design Loads .................................. 13

3.4 Allowable Stresses ............................ 16

3.5 Footing Design ............................... 17

3.6 Floor Design ................................... 18

3.7 Wall Design .................................... 20

3.8 Concrete Roofs ................................ 25

3.9 Dome Roof Design ......................... 26

3.10 Other Roof Designs ........................ 30

3.11 Concrete and Shotcrete Cover ......... 30

3.12 Additional Considerations in Cold Climates ........................... 31

3.13 Tank Appurtenances ....................... 32

4 Earthquake Design Considerations

4.1 Introduction .................................... 35

4.2 Seismic-Design Categories ............... 37

4.3 Seismic-Design Loads ...................... 38

4.4 Vertical and Horizontal Forces ........ 39

4.5 Other Effects ................................... 40

4.6 Allowable Stresses ............................ 41


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SEC. PAGE SEC. PAGE

4.7 Maximum Allowable Coefficient of Friction ................................. 42

4.8 Serviceability Requirements............. 42

4.9 Foundation Design .......................... 43

4.10 Minimum Freeboard ....................... 43

4.11 Design for Seismic Effects of Backfill ...................................... 43

5 Construction Procedures

5.1 Scope ............................................. 44

5.2 Cast-in-Place Concrete ................... 44

5.3 Precast Concrete .............................. 53

5.4 Waterstops and Sealants .................. 55

5.5 Elastomeric Bearing Pads and Sponge Fillers ............................ 56

5.6 Tolerances ....................................... 56

5.7 Cleaning and Disinfection .............. 57

5.8 Backfill ............................................ 57

5.9 Electrical Grounding ....................... 57

6 Watertightness

6.1 General ........................................... 58

6.2 Testing ............................................ 59

6.3 Repairs ............................................ 59

7 Observations .................................. 61

8 Affidavit of Compliance ................ 61

Appendixes

A Bibliography .................................. 63

B Observation Procedures

B.1 Scope .............................................. 65

B.2 Observations DuringConstruction ............................. 65

B.3 Observations After Construction ..... 68

B.4 Observations During Routine Maintenance ............................. 69

C Additional Design Considerations

C.1 Roof Openings ................................ 73

C.2 Ladders and Stairs ........................... 73

C.3 Floors .............................................. 73

C.4 Sponge-Rubber Fillers ..................... 74

Figures1 Typical Floor-Slab Construction

Joints ......................................... 19

2 Types of Joints Used Between the Wall and Foundation of Concrete Water-Storage Tanks ........................................ 24

3 (A) Hinged Dome–Wall Connection;(B) Separated Dome–WallConnection ............................... 27

4 Transfer of Tangential Shear From Wall to Base .............................. 38

5 Net Effective Base-Pad Width After Shear Deformation .................... 42

Table1 Response Modification Factor, R,

for Type of Tank Base ............... 36


Documents

D115-17 Tendon-Prestressed Concrete Water Tanks · PDF fileiii Committee Personnel The AWWA Standards Committee on Concrete Water Tanks, Tendon-Type Prestressed, which reviewed and