ACI Global Home Middle East Region Portal Western Europe Region Portal
Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Topics In Concrete
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
Date:
January 1, 1981
Author(s):
Editor: Stewart C. Watson
Publication:
Symposium Papers
Volume:
70
Abstract:
SP70 The proceedings of the World Congress on Joint Sealing and Bearing Systems for Concrete Structures reports on new developments and case histories. General subjects include: movements and forces, bearings, joints, materials, architectural applications, seismic considerations, pavements, and research and development.
DOI:
10.14359/14122
SP70-12
lngo Schrage
A review of slip resistance values is given for the interaction between several materials common in bearings for civil engineering. Friction between rubber and concrete is emphazised. Recent test results on bearing pads (plain rubber-bearings) and on specimens representing the outer layer of laminated bearings (reinforced rubber-bearings) are communicated. Those tests have been initiated in order to verify the assumption, that non-anchored rubber-bearings are appropriate to transfer short term tangential life loads without slip. Reinforced bearings follow some essentials of Coulomb's friction laws. As for friction coefficient vs. normal stress and vs. slip velocity rubber behaves unlike rigid solids. From the engineering point of view these statements are also good for bearing pads within the investigated range, though there are fundamental differences between those two kinds of bearing as far as response to lateral forces is concerned. There are only few national codes of practice for the "anchoring" of non-anchored rubber-bearings by the effects of friction. Among them the nowadays building regulations in Germany may serve as an approach to this aim. Nevertheless these regulations might become less restrict with regard to reinforced bearings on concrete, whereas frictional attachement of rubber to other materials should be handled with caution. Plain bearings need a new formulation of the slip criterion. Influences by the strain rate and by ambient temperature should be taken into account too.
10.14359/17410
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
SP70-08
W. R. Buechler
The paper deals with the difficulties involved in the calculation of particularly large bridge bearings and other criteria that might lead to the decision to specify proof-testing. Using the example of the testing-rig for 100.000 KN and the bearings for the River Orwell bridge, the testing rig itself, the specifications for the tests, the measurements and test results are described, conclusions are drawn on the basis of the tests and recommendations for future applications are given.
10.14359/17406
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
Results Per Page 5 10 15 20 25 50 100
Edit Module Settings to define Page Content Reviewer