International Concrete Abstracts Portal

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 64 Abstracts search results

Document: 

SP70-42

Date: 

January 1, 1981

Author(s):

Jupp Grote

Publication:

Symposium Papers

Volume:

70

Abstract:

In view of the practically incalculable long-term behaviour of elastomer and all the hazards of rubber products manufactured in small batches, German authorities preferred to lay stress more on the reliability of high-quality performance than on detailed design calculations. They decided on one single approved compound based on polychloroprene, and on a single table of approved dimensions. . .The institution submits an annual report on this quality control.

DOI:

10.14359/17440


Document: 

SP70-43

Date: 

January 1, 1981

Author(s):

G.H. Beguin

Publication:

Symposium Papers

Volume:

70

Abstract:

Three phenomena govern the horizontal movements of structures: shrinkage, creep, and thermal expansion. Each of thse factors is dependent on climatic conditions. The response of the structure to these effects is determined by the specific thermal properties of the particular material used in concstruction and by the severeness of the climatic changes at the bridge location.

DOI:

10.14359/17441


Document: 

SP70-44

Date: 

January 1, 1981

Author(s):

Julian R. Panek

Publication:

Symposium Papers

Volume:

70

Abstract:

Properly formulated sealants - applied by reputable applicators - following recommendations by the sealant manufacturer - should perform at least 20 years - when the sealants are used within their movement capability.

DOI:

10.14359/17442


Document: 

SP70-37

Date: 

January 1, 1981

Author(s):

Fritz Leonhardt

Publication:

Symposium Papers

Volume:

70

Abstract:

The history of the first use of neoprene and teflon for sealed expansion joints and pot bearings is given. Experience teaches that joints and bearings are often causes for the need for maintenance. Therefore, the challenge for the further development must be to improve durability and facilitate inspection and maintenance. For expansion joints, the first rule is to reduce their number by continuity of bridge decks and other structures over large lengths. The second rule is to improve materials and all structural details towards more durability and to apply sufficient safety factors for all dimensions. The influence of temperature effects, differential settlement and imperfections must be given greater consideration. Suitable design details must be provided to permit the replacement of bearings. The presentation includes some recent European examples of joints and bearings which attempt to satisfy these requirements.

DOI:

10.14359/17435


Document: 

SP70-38

Date: 

January 1, 1981

Author(s):

W. I. J. Price

Publication:

Symposium Papers

Volume:

70

Abstract:

The force/movement characteristics of bridge bearings are classified into three groups and the implications of this classification are examined in terms of the compound stiffnesses of piers. The modelling of the foundation as an elastic continuum and its influence on the compound stiffness is discussed. The interactive effects of external and internal forces on the deck are considered in relation to the distribution of forces and movements at supports and the available analytical techniques are extended to examine some unusual features in the distributions of movements at joints and braking forces on piers measured on bridges on service.

DOI:

10.14359/17436


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