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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 12 Abstracts search results
Document:
SP203
Date:
August 1, 2001
Author(s):
Co-Editors: Edward G. Nawy and Andrew Scanlon / Sponsored by: ACI Committee 435
Publication:
Symposium Papers
Volume:
203
Abstract:
Code Provisions for Deflection Control in Concrete Structures (ACI SP-203) contains 11 papers. Designers, constructors, and codifying jurisdictions will benefit from reviewing deflection-control provisions in codes from other countries and international entities. Other topics include span/thickness limitations for deflection control, effect of flange width on deflection and deflection predictions, bending stiffness effects, and time-dependent deflection and cracking effects on flat slabs. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP203
DOI:
10.14359/14011
SP203-01
A. Scanlon, D. R. Cagley Orsak, and D. R. Buettner
AC1 Building Code requirements for deflection control are critically reviewed. Provisions for minimum thickness, deflection computations, and permissible computed deflections are reviewed. Differences in the approaches to deflection control for one-way and two-way construction are identified. Limitations in the application of the prescribed deflection calculation method are discussed. Results of a survey of consulting firms concerning deflection control in design offices are presented. The paper concludes by suggesting possible directions for future changes in building code requirements for deflection control.
10.14359/10801
SP203-02
A. W. Beeby
This paper provides an outline of the provisions for design for serviceability given in the current version of Eurocode 2; the Eurocode for the design of concrete structures. The provisions for stress limitation and crack control are outlined briefly together with some of the reasoning behind them. A more detailed description of the background and content of the clauses dealing with the control of deflection are given.
10.14359/10802
SP203-03
R. H. Scott
A brief history is given of UK Code requirements for deflection control since 1948. Current requirements of BS8110 are then presented followed by a summary of developments concerning high strength concrete. Finally, future developments involving Eurocode 2 are indicated.
10.14359/10803
SP203-04
R. I. Gilbert
This paper describes the behavior of reinforced and prestressed concrete flexural members under sustained service loads and outlines recent developments in the design of concrete structures for the serviceability limit states, particularly with regard to deflection and crack control. The effects of concrete cracking, creep and shrinkage on cross-sectional stresses and deformation are demonstrated and discussed for a wide range of actions and reinforcement layouts. Recent amendments to the serviceability provisions of the Australian Standard for Concrete Structures AS3600 are presented and the background to, and reasons for, the proposed changes are explained. The paper also highlights the inadequacies of the existing deflection calculation procedure in AC1 3 I8M-99 and suggests ways to improve it. A method is proposed for calculating the time-dependent deflection of reinforced and prestressed concrete members taking into account the time-dependent effects of creep and shrinkage, including the loss of stiffness caused by shrinkage induced cracking and the breakdown of tension stiffening with time. The method is illustrated by several examples.
10.14359/10804
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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