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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 19 Abstracts search results
Document:
SP72-06
Date:
December 1, 1981
Author(s):
William L. Gamble and Ned H. Burns
Publication:
Symposium Papers
Volume:
72
Abstract:
This paper presents a historic review of the development of reinforced and prestressed concrete floor slabs. There has been an emphasis on tests of prototype and scale model structures in the past, and much current design practice is related to the results of these tests. It is also noted that design and construction of slab structures have often been ahead of the develop-ment of coherent analyses of these complex structures. While reinforced concrete slabs have been built since the earliest days of the 20th century, prestressed slabs have been developed and built only in the second half of the present century. In spite of the many advances in the analysis and design of slabs, a number of questions remain. Reinforcement detailing is important to the satisfactory behavior of slabs, and this may be particularly true at edge columns, and in edge beams. The shear capacity of beamless slabs, especially when moments are also to be transferred, is an area in which many uncertainties still exist. Effects of concentrated loads and of holes on moment distributions have not been extensively studied.
DOI:
10.14359/6758
SP72-12
J. H. Appleton
Increases in engineering design productivity are possible through increased computer usage. Increased computer usage by engineers is possible if computer programs are made easier and the results easier to interpret. Means of making computers easier to use are presented.
10.14359/6764
SP72-05
Peter Gergely
The effects of the thickness of concrete cover on corrosion, crack width, fire protection, and development length are examined. Increased cover thickness and concrete with low permeability are necessary for corrosion protection, though the former leads to wider surface cracks. However, transverse crack-ing and the width of cracks usually do not aggravate the corrosion problem. Thus it is not advisable in most structures to limit the surface crack width in order to avoid or reduce corrosion. Longitudinal cracks along the bar can cause rapid corrosion. The only reason for surface crack width limitation in buildings is appearance; fortunately recommended limits can usually be met even with heavy covers unless the beam is wide and the bar spacing is large. Fire damage to most indeterminate structures is dictated by thermal forces not as much by temperature rise of the steel. Determinate structures fail when a section loses its capacity but moderate covers are usually sufficient for fire protection of the steel. Crack width limits and cover requirements in current codes should be examined.
10.14359/6757
SP72-02
R. Lenschow, S. 0. Olesen, and S. Sahlin
The use of concrete structures in off shore installations offers a challenge to structural engi-neers. Due to lack of direct experience from comparab-le, earlier concrete structures, it has often been necessary to rely more heavily on knowledge of the basic properties of concrete under extreme conditions. The paper describes a few examples. Inclined slipforming of large concrete tower structures requires creep and shrinkage deformations within the first few days to be accurately estimated taking into account the effect of heat generation and age on the strength and stiffness properties of the concrete. Off shore structures are generally exposed to fatigue loading from waves. Wave load histograms from the North Sea are presented and the problems in estimating the fatigue damage to the concrete is described. The effect of concentrated impact loads on slabs and cylindrical shells is treated. FEM analysis as well as laboratory tests have been performed. Finally, the strength of concrete under high water pressure is discussed.
10.14359/6754
SP72-18
Hedley E. H. Roy
The paper discusses the need for interaction between the engineer and his fellow professionals. In particular, refeences made to the role of the structural engineer in the design of buildings, and the liaison which should take place with architects and other members of the design team. The team approach to design is discussed, and some suggestions are made with respect to the disciplines which may be represented on a project team. Examples are given of projects in which the engineer has been instrumental in determining the final results.
10.14359/6770
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