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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 20 Abstracts search results
Document:
SP86
Date:
August 1, 1985
Author(s):
Editor: Gajanan Sabnis / Sponsored by: ACI Committee 435
Publication:
Symposium Papers
Volume:
86
Abstract:
Included in this publication are reports on temperature-induced deflections and observed deflections of reinforced concrete slab systems; measured and long-term deformations; deflection analysis of cable-stayed segmental prestressed concrete bridges; lateral stiffness characteristics of reinforced concrete frame-wall structures; rational deformation prediction of prestressed members; a study of service load deflections and ultimate load deflections of flat slab structures; probabilistic approach to deflection controlled reinforced concrete slab design; deformations and stresses in flanged concrete structures due to temperature differentials; structural serviceability under dynamic loading; and deflections of: partially prestressed members, waffle slabs, concrete slabs under construction loading, and cracked prestressed concrete members. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP86
DOI:
10.14359/14043
SP86-06
Maher K. Tadros and Amin Ghali
A manual calculation procedure is presented for predic-tion of deflection of partially prestressed beams. Adequate accur-acy is achieved by accounting for the important parameters affecting the deflection: creep and shrinkage of concrete, relaxation of pre-stressed steel, cross section areas and locations of prestressed and nonprestressed steel and cracking at the sections where the tensile strength of concrete is exceeded. Design aids are presented to sim-plify calculation of properties of cracked sections. Numerical exam-ples are included.
10.14359/6429
SP86-07
Cameron J. Graham and Andrew Scanlon
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.
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
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