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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

Document: 

SP59-19

Date: 

January 1, 1979

Author(s):

Arthur R. Anderson

Publication:

Symposium Papers

Volume:

59

Abstract:

The term "code" as used in the construction industry is not applicable in the same sense to the shipbuilding industry. . .This paper reviews the history of codes for concrete ships and discusses the Federation Internationale de la Precontrainte (FIP) report, "Considerations for Design of Prestressed Concrete Ships." Design of the Arco-Pertamina liquid petroleum gas facility is described briefly.

DOI:

10.14359/17780

Document: 

SP59-18

Date: 

January 1, 1979

Author(s):

Ben C. Gerwick, Jr.

Publication:

Symposium Papers

Volume:

59

Abstract:

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.

DOI:

10.14359/17779

Document: 

SP59-17

Date: 

January 1, 1979

Author(s):

P.W. Abeles

Publication:

Symposium Papers

Volume:

59

Abstract:

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.

DOI:

10.14359/17778

Document: 

SP59-16

Date: 

January 1, 1979

Author(s):

Fritz Leonhardt

Publication:

Symposium Papers

Volume:

59

Abstract:

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.

DOI:

10.14359/17777

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