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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 20 Abstracts search results
Document:
SP86-01
Date:
August 1, 1985
Author(s):
ACI Committee 435
Publication:
Symposium Papers
Volume:
86
Abstract:
This report summarizes available methods for calcu-lating deflections of reinforced concrete beams subjected to temperature change. Selection of design temperatures and temper-ature gradients is discussed as well as the effects of cracking on response in the service load range.
DOI:
10.14359/6424
SP86-02
This report is in two distinct parts. Part I is a summary of published studies on slab deflections (3 from Australia, 1 from Scotland, 1 from Sweden, 2 from U.S.). The summary focuses on construction practices and materials quality. Comparison of deflections calculated by various methods with actual long-term deflections is made in some cases. Part II summarizes several construction problems and mate-rial deficiencies which can contribute to large long-term deflec-tions. Focusing on large construction loads, the authors show
10.14359/6425
SP86-03
Stephen L. Bakoss, Alan Burfitt, Les Cridland, and Jack L. Heiman
A 120m tall building incorporating both in-situ and precast post-tensioned concrete components was instrumented to observe some aspects of its structural behaviour. The instrumentation was commenced more than ten years ago, it includes embedded and surface strain and temperature transducers, survey reference points, wind pressure tappings, and anemometers above the roof of the building to measure wind characteristics. The paper describes the strain and deformation instrumentation and method of data acquisition. The measured long-term vertical strains and deformations in one of the columns are presented and are compared with values predicted by two methods which are suitable for use by designers. Reference is made to the results of an extensive materials testing programme the results of which enabled the assessment of methods of prediction for the long-term creep and shrinkage properties of the concrete.
10.14359/6426
SP86-04
M. S. Troitsky, Z. A. Zielinski, and K. N. Ashok
This paper discusses camber control in segmental precast prestressed concrete cable stayed bridges. The prototype bridge structure consisting of three continuous spans is analyzed both during erection and service stages. The method of predicting the initial camber during erection and calculation of the required pre-tensioning forces in the cable stays to produce this camber are discussed. A numerical example analysing deflections for a typical segmental prestressed concrete bridge is presented.
10.14359/6427
SP86-05
R. I. Gilbert and B. V. Rangan
Deflections can be controlled by limiting the span-depth ratios of flexural members. In the first part of the paper, the allowable span-depth ratios specified by the ACI Code, the CEB-FIP Model Code, the British Code, and the Australian Code are reviewed. It is found that the provisions of the ACI Code and the CEB Code are too limited, and the methods of calculation given in the other two codes are too detailed. All the four codes have an important drawback in that it is not known what deflections will result if the allowable span-depth ratios are used in design. The second part of the paper briefly outlines the authors' recent research in which suitable expressions for allowable span-depth ratios are proposed. The last part of the paper includes several numerical examples to illustrate how the new proposals can be used in design.
10.14359/6428
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