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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 12 Abstracts search results
Document:
SP73-10
Date:
March 1, 1982
Author(s):
H.Faruk Karadogan,Le-Wu Lu, and Ti Huang
Publication:
Symposium Papers
Volume:
73
Abstract:
Small size models of two concrete floor systems have been tested for their elastic and post-elastic behavior under in-plane shear action. Parameters studied include cyclic and monotonic loading, shear span aspect ratio, effect of gravity load and repair by epoxy injection method. This report describes the development of the model and techniques used in the testing. Preliminary test results and conclusions are also presented.
DOI:
10.14359/6780
SP73-05
Ray W. Clough and Akira Niwa
The basic purpose of this research was to investigate the feasibility of studying the nonlinear earthquake response behavior of concrete arch dams on a 20 ft. square shaking table. Assuming a length scale of l/150, the essential similitude requirements for the model material are derived. The development of suitable plaster, celite, sand and lead powder mixtures is described, and the proportions and properties of adopted materials are listed. Shaking table tests are described of a segmented arch rib model designed of this material to simulate the monolith joint opening behavior of an arch dam, and preliminary results are presented. Also, the test of a model of Koyna Dam is mentioned, where the model behavior simulated the observed cracking of the prototype. The principal conclusion of the investigation is that shaking table research is a practical means of studying the nonlinear earthquake response of concrete arch dams, including their actual failure mechanisms.
10.14359/6775
SP73-07
James K. Gran, John R. Bruce, and James D. Colton
Two l/30-scale models of reinforced concrete cylindrical missile shelters were built and tested to study the response of buried reinforced concrete structures subjected to severe dynamic loads. To assess the applicability of small-scale modeling to this type of problem, the results of the l/30-scale model tests were compared with l/6-scale results from a parallel program. A comparison of the l/30-scale and l/6-scale tests shows that the surface loads and soil responses matched and that the structural responses agreed very well. For the elastic structures, concrete surface strains measured in the l/30-scale test and reinforcing steel strains measured in the l/6-scale test showed that the direct loading wave, the reflections from the base and the closure, the base and closure flexure, interface friction, and soil resistance to punchdown were all reproduced accurately at l/30-scale. For the inelastic structures, the responses agreed up to the time of failure of the l/6-scale structure. Failure in the l/6- scale structure occurred at an apparently locally weak section of concrete. Concrete surface strains measured in the l/30-scale test and reinforcing steel strains measured in the l/6-scale test showed excellent agreement above the failure location. The l/30 scale strains throughout the structure were also in excellent agreement with the predictions of numerical analyses.
10.14359/6777
SP73-02
John Ferritto
The objective of the paper is to evaluate the dynamic prop-erties of model materials. Dynamic tests were conducted on micro-concrete with no. 4 maximum aggregate size, and gypsum concrete with no. 4 maximum aggregate size. The effects of strain rate (up to 2.5 in. /in. /sec) on ultimate compressive strength were obtained. The results are compared with results of dynamic tests conducted on proto-type concrete by others. Microconcrete with a no. 4 maximum aggre-gate gives good correlation with prototype values of dynamic strength increase. The ratio of dynamic to static modulus of elasticity with increasing strain rate and dynamic strength increase factor also gives good correlation. Microconcrete experiences higher strains at ultimate load than the prototype. Gypsum concrete experiences dynamic strength increase factors of approximately half those of the prototype. It may be significant that the increase in modulus of elasticity with increasing strain rate for gypsum concrete is not similar to that of prototype concrete. Strains in gypsum concrete at ultimate load are slightly higher than those for prototype concrete.
10.14359/6772
SP73-04
Daniel P. Abrams
Modeling techniques used in an experimental study of frame-wall interaction in multistory buildings subjected to strong earthquake motions are described. Considerations involved with the selection of materials, structural configuration, amounts of mass, and frequency contents and intensities of base motions are discussed with respect to limitations of small-scale modeling of reinforced concrete structures behaving in the nonlinear range of response. Samples of response observations are presented to demonstrate the applicability of using small-scale models for earthquake-engineering research.
10.14359/6774
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