Experimental study on stress concentration factors in single and groups of end bearing and floating stone columns

Download

index.pdf

Date

2014

Author

Çekinmez, Zeynep

Metadata

Show full item record

Item Usage Stats

114
views

34
downloads

In this study, small scale model tests were performed in order to observe effects of column length and undrained shear strength on settlement reduction ratios at different zones, as well as the stress concentration factor. In these tests different loading conditions, i.e. single stone column loading, unit cell loading and group loading, were studied. Stress carried by stone columns under various foundation pressures were directly measured by soil pressure transducers. Surface and subsurface settlements were measured by dial gauge and potentiometric rulers. Variation of stress concentration factor with time is assessed. Unit cell and group behavior with floating and end-bearing columns are compared. An empirical equation to obtain the group settlements from the unit cell settlements, as a function of normalized column length and normalized foundation pressure is proposed. For infinite pattern of column groups, emipirical relationships between total settlement reduction ratio and undrained shear strength and; stress concentration factor and undrained shear strength are proposed.

Subject Keywords

Shear (Mechanics)., Strains and stresses., Columns, Stone., Floating bodies., Structural analysis (Engineering).

URI

http://etd.lib.metu.edu.tr/upload/12617342/index.pdf
https://hdl.handle.net/11511/23585

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Site Specific Relationship for Strain Dependent Shear Modulus and Damping Using In Situ V S and High Strain Cyclic Test Results Zehtab, Kaveh Hassan; Yılmaz, Mustafa Tolga (2016-08-18) This study suggests a practical method for estimating site-specific strain dependent shear modulus and damping. The method uses in-situ shear wave velocity measurements and commercial cyclic laboratory tests on higher strains (i.e., 0.5% to 1%) in which the effect of disturbance is less significant. Shear modulus calculated using in-situ shear wave velocity and at higher cyclic shear strain, is used for building a hyperbolic relationship for shear stress and strain. Modified Masing's rule and the experiment...
EXPERIMENTAL INVESTIGATION OF FATIGUE DAMAGE ACCUMULATION IN 1100-AL ALLOY BILIR, OG (Elsevier BV, 1991-01-01) The cumulative fatigue damage characteristics of 1100 Al alloy were studied to gain a better understanding of the effects of the loading sequence, the percentage of initial applied load cycles and the stress ratio.
Thermal stress intensity factor evaluation for inclined cracks in functionally graded materials using Jk-integral method Demirçivi, Bengi; Dağ, Serkan; Department of Mechanical Engineering (2006) The main objective of this study is to evaluate mixed mode stress intensity factors for inclined embedded cracks in functionally graded materials. Fracture analysis of inclined cracks requires the calculation of both Mode I and Mode II stress intensity factors ( I K , II K ). In this study, k J -integral is used to calculate I K and II K . Equivalent domain integral approach is utilized to evaluate the k J - integral around the crack tip. The present study aims at developing a finite element model to study ...
Upgrading of slab-column connections using fiber reinforced polymers Binici, Barış (Elsevier BV, 2005-01-01) The results of an experimental program on upgrading of reinforced concrete slab-column connections subjected to monotonic shear and unbalanced moment transfer are presented in this study. Externally installed carbon fiber reinforced polymer (CFRP) stirrups acting as shear reinforcement around the slab-column connection area were used with two patterns of CFRP arrangements. It was found that the proposed method resulted in punching shear capacity increases up to 60% relative to the specimen without any stren...
EXPERIMENTAL INVESTIGATION AND PERFORMANCE ANALYSIS OF GASKETED-PLATE HEAT EXCHANGERS Akturk, Fatih; Sezer Uzol, Nilay; Aradag, Selin; Kakac, Sadik (2015-01-01) In this study, the thermal and hydrodynamic performance analyses of sa elected gasketed-plate heat exchanger with different number of plates are performed experimentally. A gasketed-plate heat exchanger (GPHE) test set-up is designed and constructed to perform experimental measurements for thermal and hydrodynamic performance analyses of plate heat exchangers. The experiments are performed for an industrial chevron-type plate heat exchanger under different flow conditions for a wide range of Reynolds number...

Citation Formats

Z. Çekinmez, “Experimental study on stress concentration factors in single and groups of end bearing and floating stone columns,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.