SIMPLIFIED FORMULATIONS FOR THE DETERMINATION OF ROTATIONAL SPRING CONSTANTS IN RIGID SPREAD FOOTINGS RESTING ON TENSIONLESS SOIL

Girgin K.

JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT, vol.23, no.4, pp.464-474, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 4
  • Publication Date: 2017
  • Doi Number: 10.3846/13923730.2016.1210218
  • Journal Name: JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.464-474
  • Keywords: spread footing, rotational spring constant, tensionless Winkler-type soil, axial load, bending, biaxial bending, soil-structure interaction, ELASTIC FOUNDATIONS, NUMERICAL-METHOD, AXIAL LOAD, STIFFNESS
  • Istanbul Technical University Affiliated: Yes

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.