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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 64 Abstracts search results
Document:
SP70-10
Date:
January 1, 1981
Author(s):
Maurice G. Baigent
Publication:
Symposium Papers
Volume:
70
Abstract:
There are a number of pitfalls from specification to the final installation of bridge bearings into a structure. The majority of the problems originate from a lack of attention to fundamental practical considerations. This paper is particularly directed to engineers involved in the specification, approval and installation of mechanical bridge bearings. A number of important aspects of bridge bearing design, manufacture and quality control are highlighted.
DOI:
10.14359/17408
SP70-03
Lawrence A. Hymo
In the roughly five hundred years since patents began to be granted, inventors have created millions of new ideas, in all branches of technology. Patents have provided the incentive to inventors to create new ideas, to develop those ideas and to take the risk of promoting those ideas. As a result of their efforts, technology exists now which would be beyond the comprehension of persons who lived in earlier times. In the period since the end of the Second World War, great advances have been made in bearings and expansion joints. Large movement joints are now sealed to prevent intrusion of foreign substances. Bearings have greatly increased in load ratings and endurance under adverse environmental conditions. Joints and bearings, as they now exist, were inconceivable less than 50 years ago. Patents have encouraged the numerous inventors who contributed to that progress. Patent systems exist to distinguish between real contributions and old ideas, and to limit the scope of patent monopolies to the new technology contributed by each inventor. Those systems are necessary to assure that patents reward progress, rather than retarding it by granting monopolies over ideas which should be freely available to all persons.
10.14359/17401
SP70-38
W. I. J. Price
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.
10.14359/17436
SP70-48
Gary A. Busch
The shortcomings of materials used to handle expansion joint transition dam areas in bridges have long been recognized. Now, with the introduction of a new engineering material, this challenging problem in both civil engineering and architectural structures may be overcome. The 9-year performance history of elastomeric concrete has thus far shown its capability to extend the maintence free life of expansion dams in bridges.
10.14359/17446
SP70-41
Everett E. McEwen and Geoffrey D. Spencer
The design of distribution plates under structural bearings is usually based on an assumption that the stress is distributed fairly uniformly. Thus study was undertaken first of all on a theoretical basis, and then with experimental work to determine the actual distribution of stress. . .Further experimental work is being performed and will be reported in the near future.
10.14359/17439
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