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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 21 Abstracts search results
Document:
SP59-20
Date:
January 1, 1979
Author(s):
Brian E. Clark and Walter Thorpe
Publication:
Symposium Papers
Volume:
59
Abstract:
Recommendations for the design of prestressed concrete flat slabs being prodcuced by the FIP, although taking into account the Recommendations of ACI Committee 423, must also be in accord with the limit state design philosophies on which the new CEB/FIP Model Code will be based. Alternative methods of calculating the ultimate flexural and shear strengths are considered. Cable distribution and progressive collapse after accident damage are examined. The paper describes also the structure of the FIP Working Party, which would welcome technical contribution from designers with experience in this field.
DOI:
10.14359/17781
SP59-15
T.Y. Lin
Historical development of reinforced, prestressed and partially prestressed concrete is reviewed. Methods and codes for design are discussed, with emphasis on strength and behavior requirements. The use of non-prestressed reinforcement for flexural members, members under combined shear and flexure, combined axial load and flexure are discussed, together with suggested approaches to their design and analysis.
10.14359/17776
SP59-16
Fritz Leonhardt
Experience and some damages in the last 30 years teach that full prestressing is often not the best solution for prestressed concrete structures. Better service performance can be obtained with partial prestressing. Serviceability criteria are proposed to meet performance requirements. Cracks with limited crack width are harmless, but crack width control must be improved and this can be done by partial prestressing. Rules are given for a reasonable choice of the degree of prestressing.
10.14359/17777
SP59-17
P.W. Abeles
A mixed solution of conventional design with pre-tensioned tendons was suggested by F.v.Emperger in many possiblities in 1941. The preferred solution is a design in which the section is in compression under frequently occurring load (which may also be dead load). Another solution relates to avoiding visible cracks under working load. (Limited prestress, Class 2 CEB). The latter was successfully introduced by British Railways in 1948 and in Germany in 1951/53. Very statisfactory fatigue tests were carried out in Liège in 1951. Previously full prestressing, at which only compressive stresses occur, was considered the only satisfactory solution; but according to Leonhardt this is a waste of energy. T.Y. Lin has the greatest practical experience with partial prestressing with his method of load counterbalancing.
10.14359/17778
SP59-18
Ben C. Gerwick, Jr.
Concrete Sea Structures have recently undergone rapid development, especially in the North Sea. Experience with these has shown that a number of aspects require special consideration, due to the character of the environmental forces and magnitude and combinations of loading associated with use in the sea.
10.14359/17779
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