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Home > Publications > International Concrete Abstracts Portal
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.
Showing 1-5 of 17 Abstracts search results
Document:
SP133
Date:
September 1, 1992
Author(s):
Editors: Edward G. Nawy and Andrew Scanlon
Publication:
Symposium Papers
Volume:
133
Abstract:
SP-133 Design for serviceability and safety is central to the work of structural engineers, code-writing bodies and the users. The current era of high strength materials, exotic additives and limit states of design has necessitated better control of constructed facilities in their short and long-term behavior at service load and at ultimate load. This Special Publication concentrates on topics that give the design engineer and contractor an insight into how to avoid practices that could affect the integrity or long-term performance of structural elements and systems. The text is outgrowth of a national symposium of the American Concrete Institute co-sponsored by ACI Committees 348 and 435, and covers topics ranging from crack-control in reinforced and prestressed concrete, safety provisions in design codes and practical deflection computations to limit state design principles and seismic performance of frame structures. Several papers that could not be presented due to time limitations are included. The papers dealing with serviceability, highlight requirements of the ACI Codes and Reports in addition to relevant state of the art developments. The paper covering safety deal with issues ranging from philosophical discussions of treatment of safety in codes to project case studies. Overlap is expected since serviceability and safety are indivisible. All the papers presented in this publication were reviewed by recognized xperts in accordance with the ACI review procedures. It is hoped that designer, constructors and codifying bodies will be able to draw on the material presented in improving the safety and long-term cracking and deflection behavior of concrete constructed facilities.
DOI:
10.14359/14165
SP133-03
M. Z. Cohn an Z. Lounis
An approach that integrates serviceability control with the ultimate limit state (ULS) design is presented. Each serviceability limit (SLS) is related to an amount of moment redistribution that corresponds to the permissible values of the crack widths, deflections, and stresses under service conditions. A design that simultaneously satisfies the specified ULS and SLS criteria may be obtained if the assigned moment redistribution percentages y do not exceed the recommended redistribution limits for serviceability control. The proposed approach integrates all relevant design criteria via the moment redistribution percentage y, and may be used within the framework of ACI 318-89 or other standard codes. The approach allows a direct extension to existing nonlinear, multicriteria, and optimal design methods.
10.14359/3143
SP133-05
B. Vijaya Rangan
The paper presents a summary of treatment of serviceability design in the current Australian Code, AS 3600-1988. The backgrounds to the code rules with regard to control of deflection and crack widths are presented. The provisions for durability design of concrete structures are also discussed.
10.14359/3148
SP133-06
Andrew Scanlon and Libanio Pinheiro
The treatment of design for deflection control in current practice is empirical, and relies largely on allowable computed deflections that were established on the basis of experience gained at a time when deflection control was not a critical issue in most cases. In this paper the current deterministic approach to deflection control is compared with design for safety, which is based on probability considerations.
10.14359/3154
SP133-07
Stephen J. Sopko
Reinforced concrete floor systems must be analyzed for deflections to minimize serviceability problems such as excessive deflections. Member depths should be based on serviceability requirements as well as stress, especially when long-term deflection must be considered. The ACI equations for member depth may not always be adequate to prevent excessive long-term deflections of reinforced concrete floor members where heavy sustained loads are present. Two case studies are presented focusing on floor systems which have exhibited excessive deflections. From this investigation and analysis, proper design, detailing, and construction practices will be discussed to minimize serviceability problems. Care must be taken in analyzing and designing floor systems which support heavy sustained loadings or masonry.
10.14359/3159
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