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 61 Abstracts search results

Document: 

SP94-57

Date: 

July 1, 1987

Author(s):

J. Breen

Publication:

Symposium Papers

Volume:

94

Abstract:

The paper is the text of the keynote address presented at the Second World Congress on Joint Sealing and Bearing Systems for Concrete Structures. The speech centers on Breen's structural engineering experience with reinforced and prestressed concrete and long-span bridges.

DOI:

10.14359/3777


Document: 

SP94-48

Date: 

July 1, 1987

Author(s):

C. Sander

Publication:

Symposium Papers

Volume:

94

Abstract:

Sealing pavement joints is necessary to minimize seepage of surface water into the subgrade and to prevent pavement damage. Joint seals for airfield pavements assume an additional level of importance since debris that is harbored in these joints can be injested and may damage aircraft engines. The paper briefly reviews a design procedure that has been used by the U.S. Air Force and includes a typical design example.

DOI:

10.14359/1643


Document: 

SP94-31

Date: 

July 1, 1987

Author(s):

A. Saxena and E. McEwen

Publication:

Symposium Papers

Volume:

94

Abstract:

A highway bridge pot-bearing system was modeled using nonlinear finite elements to analytically trace the load distribution patterns and failure modes. Material properties for the concrete block supporting the bearing were represented by a modified consti

DOI:

10.14359/1652


Document: 

SP94-38

Date: 

July 1, 1987

Author(s):

W. Koster

Publication:

Symposium Papers

Volume:

94

Abstract:

The stresses of expansion joints under dynamic aspects are examined. The analysis of dynamic stresses differs explicitly from the customary static examination. A static analysis cannot describe the dynamic actions involved and thus cannot supply a basis f

DOI:

10.14359/1654


Document: 

SP94-33

Date: 

July 1, 1987

Author(s):

T. Kelly and I. Buckle

Publication:

Symposium Papers

Volume:

94

Abstract:

Elastomeric bearings have long been used for bridge structures to provide thermal movements and girder rotations under service loads and in building structures to isolate them from ambient vibrations. By increasing the total rubber thickness and by inserting a lead plug for energy dissipation, the function of the bearing may be extended to provide seismic isolation of bridges. Seismic isolation is a design concept that reduces earthquake forces by factors of up to 10, thus greatly enhancing the seismic resistance of the supported structure. This paper provides design guidelines to enable lead-rubber bearings to safely and efficiently act as seismic isolators and reviews the mechanical properties of lead-filled elastomeric bearings. Factors affecting the elastic and postelastic properties are listed, and other design-related parameters are described. A set of design procedures to incorporate the lead-rubber bearings for bridge structures is presented. These procedures include the determination of plan size to support gravity loads, the rubber thickness to provide the required flexibility, and size of the lead core to provide energy dissipation. The procedures are applicable for areas of low and high-seismic risk. The application of the procedures is illustrated by use on a seven-span bridge.

DOI:

10.14359/1679


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