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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:
SP70-63
Date:
January 1, 1981
Author(s):
P. Smith
Publication:
Symposium Papers
Volume:
70
Abstract:
Many important issues about bearings were identified by Fritz Leonhardt, keynote speaker at the Congress. His main point was that bearings should be designed and installed to function effectively for up to 100 years. Problems in achieving this goal were discussed. . .The session identified areas in which additional work is needed; these are summarized in a table. The resolution, carried during the Congress, to form a permanent technical committee on bearing systems, a companion to ACI Committee 504, Joint Sealants, is a first step in improving communications. The Congress, attended by over 300 people, was an outstanding success.
DOI:
10.14359/17461
SP70-46
Guy S. Puccio
Since 1960, many alternative materials have been available for sealing conctraction and expansion joints in pavements and numerous devices have been manufactured for sealing bridge expansion joint s. The extruded elastomeric seal is one such product. This paper discusses those parameters and attributes that make extruded seals a viable engineering material for expansion joints in bridges and structures.
10.14359/17444
SP70-07
M. L. Roseblade
Sections of the Johannesburg East West elevated freeway are constructed over areas extensively undermined from early gold rush days. Due to this and the inherent instability of the strata, long sections of the structures were designed to accommodate substantial and sudden vertical and horizontal ground movement. A major design consideration was that compensating adjustments and realignments of the structures would be made without halting traffic flow. Various unusual bearing configurations were employed and special bearings catering for vertical and horizontal adjustment were designed. Special "High Friction" bearings were required as well as Temporarily Fixed and Uplift types incorporating unusual sliding surface materials. Initial horizontal jacking of one structure was carried out to confirm friction data. All structures are continually monitored for movements from remote points to warn of dangerous earth movements and need for remedial action.
10.14359/17405
SP70-09
David J. Lee
The Paper reviews recent experience in the United Kingdom and overseas relating to bridge bearing design and performance and is in three sections. 1. Trends in theory and practice of bearing design. 2. Remarks on the specification of bridge bearings in accordance with the proposed new British Standard for Bridges. (BS 5400: Part 9: Bridge Bearings). The document on bearings has been issued in draft for public comment. Following a review of comments received it is expected that the final document will be published at the end of 1981 or in early 1982. As it is the first British Standard to cover the major types of bearings used in bridges it will be of fundamental importance where British Standards are adopted or in those areas where similar principles are applied. 3. Remarks on experiences of bearing installation and performance over the last twenty years, with particular reference to those types developed during that period, such as the elastomeric bearing and those incorporating low friction sliding surfaces.
10.14359/17407
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
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