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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:
SP70-15
Date:
January 1, 1981
Author(s):
Waldemar Koster
Publication:
Symposium Papers
Volume:
70
Abstract:
The Maurer-Normanker, proved now for 15 years of service, and the new designed Robek-Zahnanker have practically the same high level of quality. However, the new designed Robek- Zahnstegfuge showed far the best results in this dynamic load test. The reason is firstly the fact that the anchor system is incorporated into the profile without the need of any welding eliminating the concern for fatigue failure. And secondly, it was obvious during the dynamic tests that the slim section of the upper profile was working like a leaf spring, so only a reduced load went down to the anchoring system. This surprising result with the Robek- Zahnstegfuge of the laboratory tests in 1978 gives an interesting outlook for further design practices.
DOI:
10.14359/17413
SP70-10
Maurice G. Baigent
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.
10.14359/17408
SP70-11
Geoff Stranaghan
The bridge design concept described makes use of unique features of rubber bearings to introduce overall economies in construction by a favourable and adjustable distribution of external forces from the superstructure to the substructure. Additionally, rubber bearings of limited shear deflection can be applied to a bridge of twice the length of superstructure available by conventional design methods.
10.14359/17409
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
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