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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
March 1, 1982
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.
Harry G. Harris and George Jau-Jyh Wang
This paper presents a methodology for designing, fabricating, and testing small-scale dynamic models of precast concrete shearwalls originating in the construction of large panel precast concrete buildings. Design and construction of a set of 3/32-scale models which satisfy dynamic similitude is presented. Resonent vibration testing of three-story and five-story precast concrete shearwall models on a small shake table is described. Additional monotonic and cyclic tests on six five-story shearwall models under simulated earthquake loading are presented. The main parameters in these tests were the amount of steel in the vertical ties and cyclic versus monotonic loading.
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.
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.
W. G. Godden
This paper discusses shaking table tests conducted on models of two long-span curved highway bridges to study seismic response. The first is a microconcrete model study of a multi-span highway overcrossing of the type that failed in the 1971 San Fernando earthquake. This shows the predominant influence of the expansion joints in the system on gross dynamic behavior and on the failure load. The second is an elastic model study of a proposed single-span cable-stayed curved box girder bridge designed without expansion joints and cast integrally with the abutments. This shows the small damping in such a system, the influence of cable vibrations on the overall dynamic behavior, the degree to which linear dynamic analysis is applicable in determining seismic response and the efficiency of such a design in resistin horizontal ground motions.
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