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Home > Publications > 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:
SP94-32
Date:
July 1, 1987
Author(s):
H. Eggert
Publication:
Symposium Papers
Volume:
94
Abstract:
Since some national standards on bridge bearings have been issued and a certain level of knowledge seems to have consolidated, the time has come to prepare an ISO Standard. The most important elements that should be part of such an ISO Standard are listed. Contradictions between existing national standards should be clarified and eliminated. Outlived technology should not be part of an international standard while national standards still may specify such bearings for local reasons.
DOI:
10.14359/3757
SP94-49
B. Rogers and D. Shelangoskie
Central to the design of the Intermountain Power Project (IPP) mechanical cooling towers was the ability to configure connections between precast concrete members so that large horizontal seismic forces could be transferred between beams and girders and between girders and columns. Complicating the task of connection design were substantial thermal loads and severe environmental conditions. To solve these and related design questions, a testing program was undertaken using «-scale models of certain key joints in the structure. This paper presents a description of the testing program, a brief description of the structural system in which the joints were located, and the results and conclusions of the tests. Principal among the conclusions is the recognition that embedded metal pins used to transfer forces between discrete members must not only be carefully detailed, but they also must accommodate substantial elastic deformation at the joint if failure below acceptable force levels is to be avoided. In the IPP, this was accomplished by the introduction of a confined viscoelastic medium surrounding the pin. This simple addition to the joint configuration increased the force transferred through the connection by a factor of 2.5 to 3 while limiting deformation to acceptable values.
10.14359/3434
SP94-38
W. Koster
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
10.14359/1654
SP94-35
C. Clauwaert
In past decades, several types of bridge joints have been installed in Belgian bridge decks. These joint types behave very differently in time, and the lifetime of a bridge joint is determined by numerous interacting factors. Because of the increasing maintenance costs and the difficulties encountered during the repair of these vulnerable structures, a research project on bridge joints was started in 1980 at the Belgian Road Research Center. The objectives of this research are the basis of the present article. These objectives were originally based on the results of visual inspections of bridges, and they have been continuously modified during the past five years. The following topics are addressed: the relationship between the roughness of the road in the vicinity of the joint and the resulting dynamic amplification of traffic load; the movements (both horizontal and vertical) produced at the joint by heavy trucks; the determination of stresses in the anchorage of expansion joints and buried joints by means of computer programs and model studies; the calculation of the lifetime of buried joints by combining displacement spectra resulting from the deformation of the bridge, the Wholer curve of the mix constituting the joint, and the particular stress distribution in the joint; and the application of research results in practice.
10.14359/1711
SP94-37
E. Hourigan and A. Malik
The selection of bearings for a structure depends on consideration of a number of factors by designers. The success or failure of the entire structure may depend on the performance of these devices. There are a number of bearing types available on the market. In some situations, only one type of bearing may be appropriate for the particular type of structure, while in other situations the designer has to select from the variety of bearings available. The precise function of bearings will obviously vary between structures and even from one end to another end within a given structure. The bearing selection criteria described in this paper is dedicated to assisting the designer when selecting an appropriate and efficient bearing, to perform all structural functions with the least maintenance during the life of the bridge. Experience has shown that with a careful study of the functions, limitations, and initial and maintenance costs of the bearings, the designer can achieve the most desirable bearing.
10.14359/1681
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