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Limit analysis of 2-D and 3-D structures based on an ellipsoid yield criterion

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Abstract

In this paper, a nonlinear numerical technique is developed to calculate the limit load and failure mode of structures obeying an ellipsoid yield criterion by means of the kinematic limit theorem, nonlinear programming theory and displacement-based finite element method. Using an associated flow rule, a general yield criterion expressed by an ellipsoid equation can be directly introduced into the kinematic theorem of limit analysis. The yield surface is not linearized and instead a nonlinear purely kinematic formulation is obtained. The nonlinear formulation has a smaller number of constraints and requires less computational effort than a linear formulation. By applying the finite element method, the kinematic limit analysis with an ellipsoid yield criterion is formulated as a nonlinear mathematical programming problem subject to only a small number of equality constraints. The objective function corresponds to the dissipation power which is to be minimized and an upper bound to the plastic limit load of a structure can then be calculated by solving the minimum optimization problem. An effective, direct iterative algorithm has been developed to solve the resulting nonlinear programming formulation. The calculation is based purely on kinematically admissible velocities. The stress field does not need to be calculated and the failure mode of structures can be obtained. The proposed method can be used to calculate the bearing capacity of clay soils in a direct way. Some examples are given to illustrate the validity and effectiveness of the proposed method.

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Acknowledgment

The work reported in this paper is supported by a grant from the UK’s Engineering and Physical Sciences Research Council (EPSRC) and the authors are grateful for this support.

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Authors and Affiliations

  1. Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, UK

    H. X. Li

  2. School of Civil Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    H. S. Yu

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  1. H. X. Li
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  2. H. S. Yu
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Correspondence to H. X. Li.

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Li, H.X., Yu, H.S. Limit analysis of 2-D and 3-D structures based on an ellipsoid yield criterion. Acta Geotech. 1, 179–193 (2006). https://doi.org/10.1007/s11440-006-0020-x

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