Abstract
In spread footings, the rotational spring constants, which represent the soil-structure interaction, play an important role in the structural analysis and design. To assign the behaviour of soil, which is generally represented via Winkler-type tensionless springs, necessitates time consuming iterative computing procedures in practice. In this study, a straightforward approach is proposed for the soil-structure interaction of rigid spread footings especially subjected to excessive eccentric loading. By considering the uplift of footing, the rotational spring constants of those type footings under axial load and biaxial bending are easily attained through the proposed simplified formulations. Since these formulations enable manual calculation, iterative computer efforts are not required. The formulations under consideration can be applicable to symmetric and non-symmetric rigid spread footings. The numerical results of this study are verified with SAP2000.
Highlights
A footing is a sub-structural component transferring the loads from the superstructure to soil
No significant work on the determination of rotational spring constant in spread footings regarding the uplifting from soil
The simplified formulations enabling the manual calculation are proposed to avoid from the iterative computer procedures. These formulations are developed to assess the rotational spring constants of circular and rectangular rigid spread footings subjected to axial load and biaxial bending by taking the foundation uplift from the soil into consideration
Summary
A footing is a sub-structural component transferring the loads from the superstructure to soil. The soil-structure interaction is included in the push-over analysis by considering the tensionless elastic-plastic Winkler soil model Different foundation types such as mat foundation, continuous or single footings are considered in their study. As the eccentricity increases, the uplift from Winkler-type tensionless soil becomes prominent, above simple approach leads to improper results To solve this problem, the non-linear solution methods are required that generally necessitates time consuming iterative procedures. The simplified formulations enabling the manual calculation are proposed to avoid from the iterative computer procedures These formulations are developed to assess the rotational spring constants of circular and rectangular rigid spread footings subjected to axial load and biaxial bending by taking the foundation uplift from the soil into consideration. Since only the soil pressure distribution is regarded, these formulations can be applicable to the non-symmetric rigid spread footings as well as symmetric ones
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