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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 11 Abstracts search results
Document:
SP152-04
Date:
March 1, 1995
Author(s):
E. J. Ulrich, Jr.
Publication:
Symposium Papers
Volume:
152
Abstract:
Often, an apparently compatible relationship between mat and soil deteriorates due to the plague of construction details and the design-construction relationship. This paper reviews subgrade reaction in case studies of four landmark buildings in Houston. Concepts related to mat foundation analysis using the finite element method are discussed to acquaint the practitioner with the related soil-structure interaction concepts. Also included is an examination of structural considerations in connection with mat foundation design.
DOI:
10.14359/1453
SP152-05
J. S. Horvath
Two mat foundations supporting buildings were analyzed using traditional methods for modeling soil subgrades, as well as more recently developed methods. The primary purpose of the analysis was to evaluate the relative and absolute accuracy of subgrade models that can be used in routine practice. The results indicate that some of the newer methods consistently provide significantly better agreement between calculated and observed behavior compared to the traditional methods. In addition, determination of the appropriate subgrade parameters is more rational with the newer methods. With current computer analysis capabilities, there is no reason to continue use of traditional methods that were reasonable alternatives when only manual calculations could be performed. Detailed recommendations for modeling subgrades in practice are presented, with consideration given to the capabilities of commercially available structural analysis computer software. Other factors that influence mat behavior, such as superstructure interaction effects, are also discussed.
10.14359/1434
SP152-02
P. V. Banavalkar
Over the years, methods of analysis, design, and construction for structures have gone through major modifications; however, the use of mat foundations to support building loads is ancient and very well documented. The mat foundation is a result of merging individual spread footings which support column loads and rest on soil strata, piles, or piers. The size of the mat foundation partially or fully covers the footprint of the tower structure and usually extends well beyond its footprint. The bearing strata of a mat foundation is determined by the allowable soil bearing capacity, the mat performance in terms of its settlement, and its impact on the structural behavior of the superstructure. This paper discusses the analysis of a soil-supported mat foundation with emphasis on the variation of both structural members and soil properties as they impact design. The different parameters considered in this study are structural property of concrete mat; variation of modulus of subgrade reaction, both in spatial and time domain; and variation in the loading pattern imposed on the mat. An interaction between a realistic superstructure having a perimeter tubular structural frame and a corresponding mat foundation is investigated for different parametric values, such as the stiffness of structural frame and soil properties.
10.14359/1433
SP152
Editor: Edward J. Ulrich
SP152 Design and Performance of Mat Foundations is the first state-of-the-art review. Within its 267 pages, you will find informative papers dealing with mat foundations and its interaction with the superstructure, design considerations for soil-structure interaction problems, subgrade reaction, subgrade modeling, foundations for tall buildings, mass concrete pour techniques for the mat foundation geotechnical-structural interactions for innovative mat design, and large mat on deep compressible soil. Obtain your copy of SP-152 and see how the science has progressed to the use of present day technological advances. All captured in the 10 technical papers from distinguished international engineers.
10.14359/14192
SP152-07
A. R. Dar
In large concrete pours, the heat of hydration, which continues to build for several days, is a major cause of concern for structural engineers. As the surface of concrete cools off, a thermal gradient is formed across the concrete section which can cause the concrete to crack. This paper verifies that by keeping concrete warm and preventing heat from escaping rapidly, the temperature difference within the mass can be minimized, thus reducing the potential for thermal cracking. Use of this technique made possible the largest monolithic mat foundation pour in Hawaii, without construction joints and without artificial cooling of concrete.
10.14359/1558
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