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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 17 Abstracts search results
Document:
SP133-06
Date:
September 1, 1992
Author(s):
Andrew Scanlon and Libanio Pinheiro
Publication:
Symposium Papers
Volume:
133
Abstract:
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.
DOI:
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
SP133-12
Dan M. Frangopol
A formulation is presented for extending structural system design concepts from safety and serviceability to damage tolerability. The assumptions necessary to implement damage tolerability concepts in structural system design are explained using both deterministic and probabilistic approaches. A particular emphasis is placed upon redundancy measures and their use in system damage-tolerant optimum design. Examples of solutions for optimum system design for safety, serviceability, and damage tolerability are presented.
10.14359/3163
SP133-14
W. B. Cranst
The introduction of limit state design into the UK code for structural concrete in the 1960s is reviewed. The objections and controversies aroused are described. A selection of probability studies carried out in the interim is discussed and a possible way forward is outlined.
10.14359/3168
SP133-15
H. Omar and g. Morris
The behavior of laterally loaded flat-plate structures is strongly influenced by the nonlinear deformations at the plate-to-column connections. In this paper, a simple procedure is described for predicting the nonlinear moment-rotation behavior of flat-plate-to-column connections. That behavior is expressed by standardized moment-rotation functions. These functions were derived using a modified Rambert-Osgood function and all available experimental data. The influence of the most significant connection parameters such as the steel ratio, concrete strength, gravity loading, etc., on the connection behavior is incorporated into the functions. A physical model of the column region is described which facilitates the incorporation of the functions into a structural analysis computer program. The accuracy of the functions has been demonstrated for several plate-column connections. The computer analysis program is also described and an example is considered to compare results obtained from the program with those published in the literature.
10.14359/3174
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