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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:
SP73-03
Date:
March 1, 1982
Author(s):
Grant K. Wilby, Robert Park, and Athol J. Carr
Publication:
Symposium Papers
Volume:
73
Abstract:
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.
DOI:
10.14359/6773
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
SP73-09
Larsgunnar Nilsson and Sven Sahlin
An experimental and finite element analysis of the impact of a stel rod on a reinforced concrete slabl has been conduted. The object was to study the correlation between experimental and theoretical results. It was found that detailed information of nonlinear wave propagationm concrete crushing and cracking, and yielding of reinforcment steel could be obtained from the finite elem,ent analysis. A good coorelation between experimental and theoretical results was achieved. The development of different failure mechanisms can clearly be followed in the theoretical results. Such information should be very valuable in connection with the formulation of simple design formulas.
10.14359/6779
SP73-08
Alan J. Watson and John E. lnkester
The paper describes the behavior of a 1/8th scale model reinforced concrete beam to column joint under an impact load applied to the beam. The load is produced by a 1.68kg steel rod fired from an air gun with an impact velocity of either 8.9 m/s or 13.4 m/s. The column reactions were measured by foil electrical resistance strain gauges on 3 load cells. Similar strain gages gave the incident and reflected stress pulse from which the impact load on the beam has been obtained. The deflections of the beam during the impact were recorded using moving coil linear displacement transducers. The measured behaviour of the joint under impact load has been compared with that of identical specimens under static load and with calculated values.
10.14359/6778
SP73
Editor: Harry G. Harris
SP73 The small-scale dynamic model is a powerful tool for understanding structural behavior where analytical techniques are inadequate. Eleven papers are presented in this volume, beginning with similitude requirements and dynamic properties of model materials. Four papers are included on seismic loading of frame structures, frame-wall structures, arch dams, and long-span bridges. Other topics include air-blast loading of buried structures; impact loadings on beam-to-column joints and on reinforced concrete slabs; and vibration studies of both floor slabs and large panel buildings.
10.14359/14125
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