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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 12 Abstracts search results
Document:
SP73-01
Date:
March 1, 1982
Author(s):
Helmut Krawinkler and Piotr D. Moncarz
Publication:
Symposium Papers
Volume:
73
Abstract:
This paper is a state-of-the-art discussion on dynamic modeling theory and its application to scale modeling of reinforced concrete structures. Dimensional analysis is used to develop similitude requirements according to which the geometry, initial and boundary conditions, material properties and the loading of the model and prototype have to be related so that the behavior of the latter can be expressed as a function of the behavior of the former. The discussion focusses on various types of models that can be utilized to simulate the dynamic response of structures in the elastic and inelastic range. Commonly encountered problems in achieving satisfactory similitude are outlined and assessed as to the effect they may have on the reliability of prototype response prediction.
DOI:
10.14359/6771
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
SP73-03
Grant K. Wilby, Robert Park, and Athol J. Carr
Two identical small scale six storey three dimensional reinforced concrete framed structures were constructed consisting of columns, beams and floor slabs. Each structure had a single bay in each direction and was approximately one fifth of full size. All members were designed for ductility according to the seismic design requirements of ACI 318-71, One structure was subjected primarily to static lateral loading and the other structure was subjected primarily to dynamic loading on a shaking table. The lateral load strength of the statically loaded structure was accurately predicted when the actual properties of the structure were taken into account. Severe stiffness degradation occurred during cyclic loading in the inelastic range. The displacement response of the dynamically loaded structure was compared with the displacement response predicted by a dynamic frame analysis computer program and the accuracy of the predicted response was found to be extraordinarily dependent on the stiffness and-damping. The tests revealed that under lateral loading significant torsion is induced into the beams at right angles to the direction of loading and this may lead to severe torsional cracking of those beams and a consequent decrease in stiffness and strength of the framed structure.
10.14359/6773
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
SP73-11
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.
10.14359/6781
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