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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 12 Abstracts search results
Document:
SP203-01
Date:
August 1, 2001
Author(s):
A. Scanlon, D. R. Cagley Orsak, and D. R. Buettner
Publication:
Symposium Papers
Volume:
203
Abstract:
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.
DOI:
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
SP203-05
M. C. C. Guarda, J. S. lima, and 1. M. Pinheiro
This paper presents an overview of the requirements for deflection of beams and slabs in the draft Brazilian Code for concrete structures, NBR 6116:2000. Firstly, the Brazilian Code recommendations for deflection computations and allowable limits are described, and then these provisions are compared with those of section 9.5 of ACI 316-99. The paper also includes a numerical example to illustrate how the new proposals are applied to structural design. It is observed that the general criteria of the two codes are similar, but some differences are pointed out regarding minimum thickness requirements, load conditions, effective moment of inertia for continuous beams and the values of modular ratio, modulus of rupture and allowable deflections.
10.14359/10805
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