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ACI 373R-97

Design and Construction of Circular Prestressed Concrete Structures with Circumferential Tendons
Reported by ACI Committee 373
James R. Libby Chairman Robert T. Bates Daniel W. Falconer G. Craig Freas Amin Ghali Charles S. Hanskat Bradley Harris Frank J. Heger Thomas L. Holben Richard R. Imper Arthur M. James Steven R. Close Secretary Dennis C. Kohl Gerard J. McGuire Hoshi H.Presswalla Morris Schupack

Associate and Consulting ACI 373 Committee Members who contributed to the development of this report: Troels Brondum-Nielsen Ib Falk Jorgensen Miroslav Vejvoda

FOREWORD
This report provides recommendations for the design and construction of circular prestressed concrete structures (commonly referred to as “tanks”) post-tensioned with circumferential tendons. Thesethin cylindrical shells of either cast-in-place or precast concrete are commonly used for liquid and bulk storage. Vertical post-tensioning is often incorporated in the walls as part of the vertical reinforcement. Recommendations are applicable to circumferential prestressing achieved by post-tensioning tendons placed within the wall or on the exterior surface of the wall. Procedures to preventcorrosion of the prestressing elements are emphasized. The design and construction of dome roofs are also covered. Keywords: circumferential prestressing; concrete; corrosion resistance; domes; floors; footings; joints; loads (forces); prestressed concrete; prestressed reinforcement; reinforcing steel; roofs; shotcrete; shrinkage; tanks; temperature; tendons; walls.

CONTENTS Chapter 1—General, p.373R-97-2 1.1—Introduction 1.2—Objective 1.3—Scope 1.4—History and development 1.5—Definitions 1.6—Notation Chapter 2—Materials, p. 373R-97-5 2.1—Concrete 2.2—Shotcrete and filler materials 2.3—Admixtures 2.4—Grout for bonded tendons 2.5—Reinforcement 2.6—Tendon systems of tank wall and domes 2.7—Waterstop, bearing pad 2.8—Epoxy injection 2.9—Epoxy adhesives 2.10—Coatings for outer surfaces Chapter3—Design, p. 373R-97-8 3.1—Strength and serviceability 3.2—Floor and footing design
ACI 373R-97 became effective May 8, 1997. Copyright © 1997, American Concrete Institute. All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording forsound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.

ACI Committee Reports, Guides, Standard Practices, and Commentaries are intended for guidance in designing, planning, executing, and inspecting construction. This document is intended for the use by individuals who are competent toevaluate the significance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains. The American Concrete Institute disclaims any and all responsibility for the stated principles. The Institute shall not be liable for any loss or damage arising therefrom. Reference to this document shall not be made in contract documents. Ifitems found in this document are desired by the Architect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer.

373R-97-1

373R-97-2

MANUAL OF CONCRETE PRACTICE

3.3—Wall design 3.4—Roof design Chapter 4—Construction procedures, p. 373R-9719 4.1—Concrete 4.2—Shotcrete 4.3—Forming 4.4—Nonprestressedsteel reinforcement 4.5—Prestressing tendons 4.6—Tolerances 4.7—Seismic cables 4.8—Waterstops and sealants 4.9—Elastomeric bearing pads 4.10—Sponge rubber Fillers 4.11—Cleaning and disinfection Chapter 5—Acceptance criteria for liquidtightness of tanks, p. 373R-97-23 5.1—Testing 5.2—Acceptance criteria 5.3—Visual criteria 5.4—Repairs and retesting Chapter 6—References, p. 373R-97-23 6.1—Recommended...
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