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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:
SP86-12
Date:
August 1, 1985
Author(s):
Xuerun Ji, Sheng-Jin Chen, Ti Huang, and Le-Wu Lu
Publication:
Symposium Papers
Volume:
86
Abstract:
The deflection characteristics of waffle slab panels have been studied experimentally and analytically for three cases of loading: gravity load, in-plane shear, and combined gravity and shear. Scaled reinforced concrete model slabs have been tested with the gravity and shear loads applied either separately or simultaneously. Elastic finite element analysis has been made to study the deflections of the test slabs before cracking. Add-itional analytical studies have also been carried out using a method of "equivalent thickness", in which the waffle slab is re-placed by a slab of uniform thickness for computation.
DOI:
10.14359/6435
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
SP86-15
P. F. Walsh
The new draft Australian Concrete code contains sub-stantial revisions to the requirements for deflection and cracking of beams and slabs. The author was closely involved in the prepar-ation of this section of the draft code. The principle changes are explained in this paper and include: Load factors are specified for service loads. The adoption of the ACI (Branson) effective moment of inertia for deflection calculations for both reinforced and partially prestressed beams. The replacement of the allowable span-to-depth tables with revised formula consistent with the ACI formula. The method for slab deflection is related to equivalent beams. More stringent requirements are given for cracking in the secondary direction in slabs. Flexural cracking requirements are specified by bar spacing rules or limits on tensile stresses or bar stress increments.
10.14359/6438
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
SP86-04
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
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