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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 20 Abstracts search results
Document:
SP86-07
Date:
August 1, 1985
Author(s):
Cameron J. Graham and Andrew Scanlon
Publication:
Symposium Papers
Volume:
86
Abstract:
The effect of construction loading on deflection of flat plate slabs is investigated. Progressive cracking, as load is incremented to the shored slab, is included in the finite element analysis for instantaneous deflections. Individual creep curves that reflect the loading age of concrete are superimposed to obtain total creep deflections. Overall long-time deflections also include shrinkage effects. Results calculated for a multistory flat plate structure are in good agreement with a set of measured one-year deflections.
DOI:
10.14359/6430
SP86-08
E. W. Bennett and K. H. Lee
A series of nine partially prestressed concrete beams was tested by a combination of a long-time load with intermittent cycles of short-time load over a total period of about one month. Additional tests were made of three of the beam types under the long-time load alone. The load-deflection-time relationships are discussed and a method of calculation of deflection is described which takes account of the "tension stiffening" effect of the concrete between the cracks. The ACI 318-83 recommendations are also checked against the results and found to be satisfactory for initial short-time loading but unconservative for a combination of long-time and intermittent cyclic loading.
10.14359/6431
SP86-09
Teresinha do M. J. Alves and Andrew Scanlon
Load-deflection response of prestressed concrete beams with web openings is determined analytically by means of a truss model that includes the effects of progressive cracking. Post-cracking response is based on application of the effective moment of inertia concept. Good agreement between analytical results and experimental results in the service load range is indicated.
10.14359/6432
SP86-10
A. E. Aktan, V. V. Bertero, and K. Sakino
The lateral stiffness characteristics of medium-rise frame-wall systems were investigated at the serviceability limit state. Physical models of two exemplary structures, as well as individual wall elements, were tested. Experimentally measured displacements, local distortions, and internal force distributions were observed to differ by more than 100 percent from the analytically generated ones. The flexural, shear, and axial stiffnesses of individual wall elements were observed: (1) to be strongly influenced by intensity of axial force, (2) to approach nominal values based on gross-transformed section properties only at axial compression levels nearing the balanced value in the wall axial-flexural strength interaction relationship, (3) to decrease to less than 20 percent of the nominal stiffnesses at axial force levels approaching zero, and (4) to degrade significantly upon cracking at the serviceability limit state. Microcracking and very narrow cracking due to shrinkage induced by volumetric changes were identified as the main factors leading to reduced stiffnesses of walls upon first loading.
10.14359/6433
SP86-11
Alex Aswad
age; beams (supports); camber; creep properties; defor-mation; prestressed concrete; prestressing steels; prestress loss; pretensioning; roofs; shrinkage; structural analysis; viscoelas-ticity.
10.14359/6434
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