Bearing Capacity Factors of Ring Footings by Using the Method of Characteristics

2017 ◽  
Vol 35 (5) ◽  
pp. 2137-2146 ◽  
Author(s):  
Hamed Gholami ◽  
Ehsan Seyedi Hosseininia
Keyword(s):  
Bearing Capacity ◽  
Method Of Characteristics ◽  
The Method Of Characteristics

Use of critical state representations of sand in the method of stress characteristics

1987 ◽  
Vol 24 (3) ◽  
pp. 441-446 ◽  
Author(s):  
M. G. Jefferies ◽  
K. Been
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Critical State ◽  
Method Of Characteristics ◽  
Kinematic Constraint ◽  
Kinematic Constraints ◽  
The Method Of Characteristics ◽  
State Stress

The limitations of critical state representations of sand behaviour are discussed and it is shown that stress dilatancy is an implicit part of a critical state framework. It is then argued that dilatancy leads to underestimates of bearing capacity factors in the method of characteristics. Kinematic constraints should also be considered in such calculations. Both dilatancy and kinematic constraint may be introduced into a stress characteristics approach while preserving critical state characterization of sand, using the technique known as the method of associated fields. Key words: bearing capacity, critical state, stress dilatancy, method of characteristics.

Bearing capacity analysis using the method of characteristics

2013 ◽  
Vol 29 (2) ◽  
pp. 179-188 ◽  
Author(s):  
Jian-Ping Sun ◽  
Zhi-Ye Zhao ◽  
Yi-Pik Cheng
Keyword(s):  
Bearing Capacity ◽  
Method Of Characteristics ◽  
Capacity Analysis ◽  
The Method Of Characteristics

Bearing capacity factor Nγ for ring footings using the method of characteristics

2005 ◽  
Vol 42 (5) ◽  
pp. 1474-1484 ◽  
Author(s):  
Jyant Kumar ◽  
Priyanka Ghosh
Keyword(s):  
Bearing Capacity ◽  
Method Of Characteristics ◽  
Friction Angle ◽  
Outer Edge ◽  
Capacity Factor ◽  
The Method Of Characteristics ◽  
Axis Of Symmetry ◽  
Bearing Capacity Factor

The bearing capacity factor Nγ was determined for both smooth and rough ring footings using the method of stress characteristics. The analysis was based on the assumption that for a rough footing the friction angle (δ) between the footing base and underlying cohesionless material increases gradually from zero along the axis of symmetry to ϕ along the outer edge of the footing. The value of Nγ was found to decrease significantly with an increase in ri /ro, where ri and ro are the inner and outer radii of the ring, respectively. For larger values of ϕ, the magnitude of Nγ for a rough footing was seen to be significantly higher than that for a smooth footing. The obtained results were compared with those available in the literature.Key words: bearing capacity, failure, foundations, method of characteristics, plasticity.

Nγ for rough strip footing using the method of characteristics

2003 ◽  
Vol 40 (3) ◽  
pp. 669-674 ◽  
Author(s):  
Jyant Kumar
Keyword(s):  
Numerical Modeling ◽  
Bearing Capacity ◽  
Method Of Characteristics ◽  
Vertical Axis ◽  
Strip Footing ◽  
Slip Lines ◽  
The Method Of Characteristics ◽  
Foundation Base ◽  
Axis Of Symmetry ◽  
Bearing Capacity Factor

By using the method of characteristics, the bearing capacity factor Nγ was computed for a rough strip footing. The analysis was performed by considering a curved nonplastic wedge under the foundation base bounded by curved slip lines being tangential to the base of the footing at its either edge and inclined at an angle π/4 - ϕ/2 with the vertical axis of symmetry. The existing theories in the literature for rough footings, which usually employ a triangular wedge below the footing base, were generally found to provide greater values of Nγ as compared with the results obtained in this contribution.Key words: bearing capacity, foundations, failure, numerical modeling, plasticity.

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