New Findings from Centrifuge Modeling of Rocking Shallow Foundations in Clayey Ground

Influence of Physical Modeling on Adoption of Rocking Foundations in Practice

“…Linear interpolation may be used for intermediate values in table 1. In addition to the dependence on the ratio A c /A, Hakhamaneshi et al (2012) showed that footing settlement for rectangular footings increases as the ratio B/L c decreases (as footing width decreases). L c is the critical contact length, and A c = (B)(L c ) is the critical contact area.…”

“…Recent work (e.g., Gajan et al 2010, Deng et al 2012b, Hakhamaneshi et al 2012) shows that moment capacity on insensitive clay and medium-dense sand does not degrade with rotation and hence the allowable rotation of the rocking footing may be increased provided that the associated transient and permanent deformations can be sustained by the structural system. Furthermore, the uncertainty in elastic stiffness for a footing causes uncertainty in θ elastic which adds uncertainty to the calculation of an R-factor.…”

Balancing the Beneficial Contributions of Foundation Rocking and Structural Yielding to Improve Structural Seismic Resilience

“…Model foundations have been designed with various geometries, FS v , and different types of soils. In general, centrifuge tests concur that irrespective of the soil type, footings with a relatively high FS v (~10) will result in quite reasonable moment-rotation hysteresis, which quantifiably dissipates energy, without significant settlement (Deng et al [5]; Hakhamaneshi et al [10]). Large-scale 1-g tests on shallow footings report similar findings (e.g.…”

“…Figure 1a depicts a hysteresis for a structural wall fuse, and quite comparably broad and stable hysteresis can be realized at the footing-soil interface as well (Figure 1b). [20], adapted from Englekirk [7]) and rocking-dominated footing in prototype scale (Hakhamaneshi et al [10]). …”

“…More recently, researchers across the United States and Europe have undertaken a variety of 1-g and centrifuge tests coupled with numerical work to investigate the mobilization of soil-foundation capacity (see e.g. Rosebrook and Kutter [17]; Gajan and Kutter [8]; Anastasopoulos et al [1]; Deng et al [5]; Hakhamaneshi et al [10]; Gelagoti et al [9]; Drosos et al [6]). Since the centrifuge facility has the capability to create confining stress levels comparable with prototype conditions, the stress-dependent soil nonlinear behavior can thereby be reasonably captured.…”