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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 13 Abstracts search results
Document:
SP97-12
Date:
February 1, 1987
Author(s):
Harry Stavrides
Publication:
Symposium Papers
Volume:
97
Abstract:
The Chicago Department of Inspectional Services, otherwise known as the Department of Buildings, has the same mission as any other Building Department in the country--namely, to protect public safety, health, and property. As a department, it is not small in size or force, but not too large either. It is no more wasteful than any other government office. It is, however, rather effective in its mission. It does provide valuable services to the public with courtesy and speed and does have some progressive fea-tures both in its organizational makeup as well as in the manner of providing its services.
DOI:
10.14359/6906
SP97-05
S.K. Ghosh
This paper discusses the design of reinforced concrete flat plate slab sys-tems, commonly used in high-rise construction, against punching shear. A number of newly devised charts are introduced to facilitate such design. A significant problem with a new ACI Code requirement concerning shear due to moment transfer at an exterior flat plate-column joint (Sect. 13.6.3.6 of ACI 318-83) is pointed out. The problem is illustrated through a design example.
10.14359/6899
SP97-04
Henry G. Russell
When designing high-rise reinforced concrete buildings, length changes of vertical members caused by time-dependent effects must be considered. For design purposes, long-term deformations of columns, walls, and caissons may be considered to consist of instantaneous deformations, shrinkage deformations, and creep deformations. In most cases these are non-reversible deformations. Short-term time-dependent deformations are caused by temperature changes and lateral loads. These are generally reversible. Instantaneous deformations depend largely on vertical load, cross-sectional dimensions of member, and modulus of elasticity of steel and concrete at the age when the load is applied Creep deformations depend on concrete stress, size of member, amount of reinforcement, and creep properties of concrete at different ages. Shrinkage deformations generally depend on concrete materials, quantity of water in the mix, size of the member, and amount of vertical reinforcement. When the above factors are considered together with the actual stress histories and realistic material properties, it is possible to predict with reasonable accuracy the shortening of vertical members in high-rise buildings. Temperature changes occur on a daily and seasonal basis. The exposed portions of a building respond to these changes with induced forces or deformations that depend on degree of expo-sure and boundary conditions of the structural members.
10.14359/6898
SP97-10
William R. Anthony
This text is the product of a collaborative effort by the concrete construction services staff of Ceco Industries, inc. Many staff members contributed their findings and recommendations, which were organized and integrated by William R. Anthony, PE, Manager, Market Development. Through its subsidiaries, Ceco Industries is a national formwork subcontractor, and provides the preconstruction services of value engineering, systems analysis and budget pricing. In a growing number of markets, Ceco also provides a total concrete building frame contracting service.
10.14359/6904
SP97-03
Clyde N. Baker, Jr.
This paper deals with developments in caisson and high-capacity pile design and construction that have assumed importance during recent years and is heavily influenced by the writer's personal experiences which carry a decidedly U.S. perspective and in the case of caissons, a decidedly Chicago perspective. The developments covered include: In situ testing for better soil property information to use in design. Testing and instrumentation to facilitate caisson construction. 3 0 Use of large diameter, very high-bearing-pressure,belled caissons on both cohesive and non-cohesive soil.Developments in high-capacity piling and increased use of dynamic measurements during pile driving. Development of high-capacity friction caissons and design of rock sockets. 6 0 Construction of caissons under water or slurry. 7 0 Development of high-strength concrete for high-capacity caissons.
10.14359/6897
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