Concrete Formwork Svstems - Part 0 ppsx

The first is to provide technical descriptions and evaluations of ten formwork systems that are currently used in concrete construction.. The third is to present the design criteria for c

Concrete Formwork

I

University of Wisconsin-Ma dis on

Madison, Wisconsin

MARCEL DEKKER INC

D E K K E R

N E W YORK - BASEL

Copyright 1999 by Marcel Dekker, Inc All Rights Reserved.

Library of Congress Cataloging-in-Publication Data

Hanna, Awad S

Concrete formwork systems / by Awad S Hanna

p cm.—(Civil and environmental engineering series: vol 2)

Includes index

ISBN 0-8247-0072-4 (alk paper)

1 Concrete construction—Formwork I Title II Series

TA382.44.H36 1998

624.1′834—dc21 98-37262

CIP

This book is printed on acid-free paper

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Copyright1999 by Marcel Dekker, Inc All Rights Reserved.

Neither this book nor any part may be reproduced or transmitted in any form

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Current printing (last digit):

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PRINTED IN THE UNITED STATES OF AMERICA

Copyright 1999 by Marcel Dekker, Inc All Rights Reserved.

Civil and Environmental Engineering

A Series of Reference Books and Textbooks

Editor

Michael D Meyer

Department of Civil and Environmental Engineering

Georgia Institute of Technology Atlanta, Georgia

1 Preliminary Design of Bridges for Architects and Engineers

Michele Melaragno

2 Concrete Formwork Systems

Awad S Hanna

3 Multilayered Aquifer Systems: Fundamentals and Applications

Alexander H.-D Cheng

4 Matrix Analysis of Structural Dynamics: Applications and Earthquake Engineering

Franklin Y Cheng

5 Hazardous Gases Underground: Applications to Tunnel Engineering

Barry R Doyle

6 Cold-Formed Steel Structures to the AISI Specification

Gregory J Hancock, Thomas M Murray, Duane S Ellifritt

7 Fundamentals of Infrastructure Engineering: Civil Engineering Systems: Second Edition, Revised and Expanded

Patrick H McDonald

8 Handbook of Pollution Control and Waste Minimization

edited by Abbas Ghassemi

9 Introduction to Approximate Solution Techniques, Numerical Modeling, and Finite Element Methods

Victor N Kaliakin

10 Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering

V N S Murthy

Additional Volumes in Production

Chemical Grouting and Soil Stabilization: Third Edition, Revised and Expanded

Reuben H Karol

Estimating Building Costs

Calin M Popescu, Kan Phaobunjong, Nuntapong Ovararin

Formwork development has paralleled the growth of concrete construc-tion throughout the 20th century In the last several decades formwork technology has become increasingly important in reducing overall costs, since the structural frame constitutes a large portion of the cost of a form-work system

This book has three objectives The first is to provide technical descriptions and evaluations of ten formwork systems that are currently used in concrete construction The second is to serve as a tool to assist contractors in selecting the optimal formwork system The third is to present the design criteria for conventional formwork for slabs and walls using the stress and the stress modification factors provided by the Na-tional Design Specifications (NDS) and the American Plywood Associa-tion (APA)

Following a comprehensive introductory chapter, five types of form-work systems for concrete slabs are presented in chapters 2–5 These are conventional wood forms, conventional metal forms, flying forms, the column-mounted shoring system, and tunnel forms The last four

chap-iv Preface

ters describe five types of formwork systems for concrete columns and walls: conventional wood forms, ganged forms, jump forms, slip forms, and self-raising forms Particular consideration is given to topics such as system components, typical work cycles, productivity, and the advan-tages and disadvanadvan-tages associated with the use of various systems The selection of a formwork system is a critical decision with very serious implications Due consideration must be given to such factors as the system’s productivity, safety, durability, and many other variables that may be specific to the site or job at hand Chapters 5 and 9 provide a comparative analysis of forming systems for horizontal and vertical con-crete work to facilitate the selection of the optimal forming system Existing formwork design literature is inconsistent with the design criteria for wood provided by the NDS and the APA Chapters 3 and 7 provide a systematic approach for formwork design using the criteria of the American Concrete Institute committee 347-94, the NDS, and the APA For international readers, metric conversion is provided in the Ap-pendix

This book is directed mainly toward construction management, construction engineering and management students, and concrete tractors It may also serve as a useful text for a graduate course on con-crete formwork, and should be useful for practicing engineers, architects, and researchers

Awad S Hanna

Preface

Acknowledgments

1.1 Concrete Construction

1.2 Concrete Formwork

1.3 Formwork Economy and Significance

1.4 An Integrated Concrete/Formwork Life Cycle 1.5 Formwork Materials

2.1 Horizontal Formwork Systems Classification 2.2 Conventional Wood Formwork System

2.3 Conventional Metal Systems

2.4 Special Horizontal Formwork System

3.1 Properties of Form Materials

vi Contents

3.2 Properties of Area

3.3 Properties of Sawn Lumber

3.4 Properties of Plywood

3.5 Slab Form Design

3.6 Design Steps

Systems

4.1 Flying Formwork System

4.2 Column-Mounted Shoring Systems

4.3 Tunnel Formwork System

System

5.1 Factors Affecting Horizontal Formwork Selection

5.2 Choosing the Proper Formwork System Using

Tables

Systems

6.1 An Introduction to Vertical Formwork Systems

6.2 Conventional Wall/Columns Forming Systems

6.3 Ganged Forming Systems

6.4 Jump Forms

7.1 Wall Form Components

7.2 Design Loads

7.3 Method of Analysis

7.4 Stresses Calculations

7.5 Determination of Maximum Allowable Span

7.6 Design of Lateral Bracing

Systems

8.1 Slipforms

8.2 Self-Raising Formwork System

Contents vii

9.1 Factors Affecting the Selection of Vertical Formwork

System

9.2 Choosing the Proper Formwork System Using the

Comparison Tables

References

Appendix

I gratefully acknowledge a number of individuals who were instrumental

in some way in the completion of this book I begin with my friends and colleagues at the University of Wisconsin–Madison The support and en-couragement of professors John Bollinger, Al Wortley, Jeff Russell, Dick Straub, and Gary Bubenzer will always be remembered I would like also

to thank my students for inspiring me to further explore the field of con-crete formwork Thanks also go to my student Alan Lau, who assisted

in preparing the graphics

Special thanks go to the many contractors who provided me with data and graphics I would like to specifically thank the editorial team of Marcel Dekker, Inc for their strong support

I would like to convey my warmest thanks to my loving wife Paula and our son Rewais It is impossible to describe how supportive Paula has been throughout the writing of this book As I spent hundreds of long hours at my computer preparing this manuscript, her never-ending love and support inspired me to keep pushing on Most importantly, she

x Acknowledgments

gave me the greatest gift of all, our son Rewais, who is truly my reason for living My respect and love for both of them

I also take this opportunity to thank my family for their undying love and devoted support over the years; in particular, my late parents, Soliman and Sofia Hanna, who taught me how to work hard and encour-aged me to pursue my dreams I would also like to thank my sisters, Evette, Mervat, Moura, Sonia, and Janette, and my brother, Maged, for supporting my endeavor I also want to mention my special mother-in-law and father-in-mother-in-law, Botros and Bernice Hemaya, who believe in me Finally, my thanks to Professors Jack Willenbrock and Victor San-vido, my mentors—but most of all my friends They have provided me with advice and with numerous other experiences over the years for which I will be forever grateful