Practical formula for dimensioning a rectangular footing

Alğin, Halil Murat

doi:10.1016/j.engstruct.2006.08.009

Cited by 20 publications

(15 citation statements)

References 6 publications

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“…In the case of biaxial bending the contact pressure having a uniform surface distribution does not represent the actual assumptions made for the centrally located foundations [27]. The numerical approximation techniques such as the finite element method can also be used in those calculations.…”

Section: Derivationmentioning

confidence: 99%

“…The above equation (Equation (27)) can be rewritten as follows: Figure 11. Influence factors for the elastic settlement under the semi-embankment loading (see Figure 10 and Equation (28)).…”

Section: The Settlement Under Corner D Of the Specific Linear Load Comentioning

confidence: 99%

“…This pressure configuration is also adopted by the author to estimate the minimum dimensions of rectangular footing under the biaxial bending [27]. Since the Steinbrenner [19] equation is only valid for the settlement under the corner of a uniformly loaded rectangular footing, it cannot be used for the immediate settlement under the linearly distributed contact pressures.…”

Section: Introductionmentioning

confidence: 99%

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Elastic settlements under linear surface pressures on rectangular areas

Alğin¹,

Alğın²

2008

Num Anal Meth Geomechanics

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SUMMARYThis paper presents the practical closed-form solutions for elastic settlement under the linear full-contact pressures on rectangular areas resting upon an elastic mass. The linear pressure distribution is mostly assumed in practice for the rectangular footing having biaxial bending. The equations presented here are determined by evaluating the integration of Steinbrenner's strain approximation based on the stress solutions from the Boussinesq equations. The presented formulae are validated to be used for the elastic settlement under any point of linear full-contact loading, triangular and embankment types of pressure cases. In this respect, it represents a significant step forward in the understanding of elastic settlement and rotation under the practical loading cases. The presented solutions are concise and easy to use. The numerical examples are demonstrated and the resulting influence factors in graphical forms are presented for their practical use especially in the elastic settlement calculations of rectangular footing subjected to the biaxial bending.

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Section: Derivationmentioning

confidence: 99%

Section: The Settlement Under Corner D Of the Specific Linear Load Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elastic settlements under linear surface pressures on rectangular areas

Alğin¹,

Alğın²

2008

Num Anal Meth Geomechanics

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“…The size of the footing is then checked to see whether it satisfies the serviceability conditions and that the bearing capacity of the soil is not exceeded (usually not critical). As soon as the size of the footing has been confirmed as adequate, the depth of the footing is determined to ensure that it has adequate flexural, shear and punching shear strength to resist the applied loading conditions (Algin 2007). It is assumed that sufficient structural depth at the column will provide the footing with adequate shear, diagonal tension, and bending moment capacity (Pisanty & Gellert 1972).…”

Section: Introductionmentioning

confidence: 99%

“…The pressure distribution in the soil is a function of the type of soil (i.e. sand or clay), as well as the stiffness of the footing and superstructure (Algin 2007).…”

Section: Introductionmentioning

confidence: 99%

The influence of foundation stiffness on the behaviour of surface strip foundations on sand

Lemmen¹,

Jacobsz

Kearsley

2017

J. S. Afr. Inst. Civ. Eng.

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The objective of this study was to determine whether the contact stress distribution underneath a strip footing on dense cohesionless sand can be predicted as a function of the properties of the footing and that of the underlying sand. Together, the footing and the underlying sand form a foundation system which can be classified in terms of relative stiffness. Centrifuge model tests were conducted on seven aluminium footings of various depths and hence stiffness, and one reinforced concrete footing, during which the qualitative variation in contact stress distribution underneath the footing was captured with the use of Tekscan™ pressure sensors. It was found that, as long as the relative stiffness of the foundation classifies as "stiff", the contact stress distribution underneath the footing is approximately uniform. As the relative foundation stiffness is reduced, the contact stress underneath the footing edge as a percentage of the maximum stress occurring underneath the column, reduces. In the case of a semi-flexible footing tested, zero pressure was measured underneath the footing edge in response to loading of the footing. An expression is presented to allow the contact stress under the edge to be estimated as a function of the relative stiffness of the foundation. This allows the contact stress distribution underneath semi-stiff footings to be estimated. The stiffness of the model reinforced concrete footing tested reduced considerably due to cracking during loading. It is recommended that footings be provided with sufficient stiffness to classify as stiff. A modification of the benchmark value for the minimum relative stiffness classifying as stiff is proposed, based on the results of the centrifuge tests.

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Rigid Foundations Resting on an Elastic Layered Soil

Stavridis

2008

Geotech Geol Eng

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Practical formula for dimensioning a rectangular footing

Cited by 20 publications

References 6 publications

Elastic settlements under linear surface pressures on rectangular areas

Elastic settlements under linear surface pressures on rectangular areas

The influence of foundation stiffness on the behaviour of surface strip foundations on sand

Rigid Foundations Resting on an Elastic Layered Soil

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