ACI PRC-336.2-88: Suggested Analysis and Design Procedures for Combined Footings and Mats (Reapproved 2002)

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**WITHDRAWN DOCUMENT – This document has been discontinued by ACI and is available for informational purposes only.

Description

This report deals with the design of foundations carrying more than a single column of wall load. These foundations are called combined footings and mats. Although it is primarily concerned with the structural aspects of the design, considerations of soil mechanics cannot be eliminated and the designer should focus on the important interrelation of the two fields in connection with the design of such structural elements. This report is limited to vertical effects of all loading conditions. The report excludes on grade.

Keywords: concretes; earth pressure; footings; foundations; loads (forces); mat foundations; reinforced concrete; soil mechanics; stresses; structural analysis; structural design.

 

Document Details

Author: ACI Committee 336

Publication Year: 2002

Pages: 27

ISBN: 9780870313752

Categories: Foundations

Formats: PDF

This document is Withdrawn

Table of Contents

Chapter 1--General

1.1--Notation

1.2--Scope

1.3--Definitions and loadings

1.4--Loading combinations

1.5--Allowable pressure

1.6--Time-dependent considerations

1.7--Design overview

Chapter 2--Soil structure interaction

2.1--General

2.2--Factors to be considered

2.3--Investigation required to evaluate variable factors

Chapter 3--Distribution of soil reactions

3.1--General

3.2--Straight-line distribution

3.3--Distribution of soil pressure governed by modulus of subgrade reaction

Chapter 4--Combined footings

4.1--Rectangular-shaped footings

4.2--Trapezoidal or irregularly shaped footings

4.3--Overturning calculations

Chapter 5--Grid foundations and strip footings supporting more than two columns

5.1--General

5.2--Footings supporting rigid structures

5.3--Column spacing

5.4--Design procedure for flexible footings

5.5--Simplified procedure for flexible footings

Chapter 6--Mat foundations

6.1--General

6.2--Finite difference method

6.3--Finite grid method

6.4--Finite element method

6.5--Column loads

6.6--Symmetry

6.7--Node coupling of soil effects

6.8--Consolidation settlement

6.9--Edge springs for mats

6.10--Computer output

6.11--Two-dimensional or three-dimensional analysis

6.12--Mat thickness

6.13--Parametric studies

6.14--Mat foundation detailing/construction

Chapter 7--Summary

Chapter 8--References

8.1--Specified and/or recommended references

8.2--Cited references

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