Abstract
The HL-RF iterative algorithm of the first order reliability method (FORM) is popularly applied to evaluate reliability index in structural reliability analysis and reliability-based design optimization. However, it sometimes suffers from non-convergence problems, such as bifurcation, periodic oscillation, and chaos for nonlinear limit state functions. This paper derives the formulation of the Lyapunov exponents for the HL-RF iterative algorithm in order to identify these complicated numerical instability phenomena of discrete chaotic dynamic systems. Moreover, the essential cause of low efficiency for the stability transform method (STM) of convergence control of FORM is revealed. Then, a novel method, directional stability transformation method (DSTM), is proposed to reduce the number of function evaluations of original STM as a chaos feedback control approach. The efficiency and convergence of different reliability evaluation methods, including the HL-RF algorithm, STM and DSTM, are analyzed and compared by several numerical examples. It is indicated that the proposed DSTM method is versatile, efficient and robust, and the bifurcation, periodic oscillation, and chaos of FORM is controlled effectively.
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Abbreviations
- FORM:
-
First order reliability method
- STM:
-
Stability transfor `mation method
- DSTM:
-
Directional stability transformation method
- SORM:
-
Second order reliability method
- MPP:
-
Most probable point
- PMA:
-
Performance measure approach
- U-space:
-
Standard normal space
- SR1:
-
Symmetric rank-one
- LE:
-
Lyapunov exponent
- X :
-
Random variable vector
- U :
-
Normalized random variable vector
- U * :
-
Most probable point
- d :
-
Search direction
- β :
-
Reliability index
- μ :
-
Mean vector
- σ :
-
Standard deviation vector
- g(X):
-
Performance function
- ∇g(·):
-
Sensitivities of performance function
- J :
-
Jacobian matrix
- H :
-
Hessian matrix
- P f :
-
Failure probability
- Ф(·):
-
Cumulative distribution function
- f(·):
-
Iterative function vector
- C :
-
Involutory matrix
- λ :
-
Control factor
- qr[.]:
-
QR-factorization process
- ñ(U k):
-
Radial direction
- n ⊥(U k):
-
Circumferential direction
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Acknowledgments
The supports of the Fundamental Research Funds for the Central Universities of China (No JZ2016HGBZ0751) and the National Natural Science Foundation of China (Grant Nos. 90815023 and 51021140006) are greatly appreciated. The authors also thank Professor Gengdong Cheng and Dr. Hao Hu for their comments and discussion.
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Meng, Z., Li, G., Yang, D. et al. A new directional stability transformation method of chaos control for first order reliability analysis. Struct Multidisc Optim 55, 601–612 (2017). https://doi.org/10.1007/s00158-016-1525-z
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DOI: https://doi.org/10.1007/s00158-016-1525-z