An Experimental study on static and dynamic behaviour of model pile foundations

Ünsever, Yeşim Sema
When the subsoil beneath a structure is weak to carry the loads from the superstructure, use of piled foundations is one of the widely employed alternatives. These types of foundations may also be subjected to transient or cyclic lateral loads arising from earthquake, wind, etc. Detailed case histories of dynamically loaded pile foundations are not too many in the literature. In this study, a series of static cyclic horizontal load tests and 1-g shaking table tests on various model foundations, such as piled raft, pile group, full raft, small raft, capped pile and single pile were performed in dry sand. In dynamic tests, the response of the pile foundations was investigated under cyclic loadings with variable frequencies. After testing stage, finite element software, PLAXIS 3D was used for few setups to have a deeper understanding of the behavior of the piled raft. The results showed that the raft has a significant effect on reducing the settlements and transmitting vertical load through the raft which causes stress increment in the soil. This stress increment causes to increase the amount of load carried by piles. Also, the behavior of the piled raft is affected considerably by the interaction of the piles and the raft, which leads to the conclusion that it is not plausible to assess the behavior of the piled raft by examining the components individually.


An analytical model for stress-strain behavior of confined concrete
Binici, Barış (Elsevier BV, 2005-06-01)
It is well known that the strength and ductility of concrete are highly dependent on the level of confinement provided by the lateral reinforcement. The stiffness and the constitutive behavior of the confining reinforcement (elastic, elastoplastic, etc.) are the important factors affecting the behavior of concrete. In this study, a new simple confined concrete model is developed for describing the axial and lateral deformation characteristics of concrete under triaxial compression. The stress-strain relatio...
An improved finite grid solution for plates on generalized foundations
Karaşin, Abdulhalim; Gülkan, Polat; Department of Civil Engineering (2004)
In many engineering structures transmission of vertical or horizontal forces to the foundation is a major challenge. As a first approach to model it may be assumed that the foundation behaves elastically. For generalized foundations the model assumes that at the point of contact between plate and foundation there is not only pressure but also moments caused by interaction between the springs. In this study, the exact stiffness, geometric stiffness and consistent mass matrices of the beam element on two-para...
Assessment of soil structure earthquake interaction induced soil liquefaction triggering
Unutmaz, Berna; Çetin, Kemal Önder; Department of Civil Engineering (2009)
Although there exist some consensus regarding seismic soil liquefaction assessment of free field soil sites, estimating the liquefaction triggering potential beneath building foundations still stays as a controversial and difficult issue. Assessing liquefaction triggering potential under building foundations requires the estimation of cyclic and static stress state of the soil medium. For the purpose of assessing the effects of the presence of a structure three-dimensional, finite difference-based total str...
A simple assessment of lateral pier response of standard highway bridges on pile foundations
Yüksekol, Ümit Taner; Bakır, Bahadır Sadık; Department of Civil Engineering (2007)
Group of piles are widely used deep foundation systems to resist lateral and vertical loads. Seismic and static performance of pile groups mostly depend on soil type, pile spacing and pier rigidity. Not many pile lateral load tests have been performed due to high costs. Advanced and complex analytical methods were developed over the years to assess nonlinear lateral pile response. This research is conducted aiming at developing a practical analysis method to verify the lateral performance of pile groups and...
A detailed analysis for evaluation of the degradation characteristics of simple structural systems
Kurtman, Burak; Erberik, Murat Altuğ; Department of Civil Engineering (2007)
Deterioration in the mechanical properties of concrete, masonry and steel structures are usually observed under repeated cyclic loading in the inelastic response range. Therefore such a behavior becomes critical when these types of structures are subjected to ground motions with specific characteristics. The objective of this study is to address the influence of degrading behavior on simple systems. The Structural Performance Database on the PEER web site, which contains the results of cyclic, lateral-load ...
Citation Formats
Y. S. Ünsever, “An Experimental study on static and dynamic behaviour of model pile foundations,” Ph.D. - Doctoral Program, Middle East Technical University, 2015.