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Structural Engineering and Mechanics
  Volume 65, Number 4, February25 2018 , pages 415-422

Conjugate finite-step length method for efficient and robust structural reliability analysis
Behrooz Keshtegar

    The Conjugate Finite-Step Length\" (CFSL) algorithm is proposed to improve the efficiency and robustness of first order reliability method (FORM) for reliability analysis of highly nonlinear problems. The conjugate FORM-based CFSL is formulated using the adaptive conjugate search direction based on the finite-step size with simple adjusting condition, gradient vector of performance function and previous iterative results including the conjugate gradient vector and converged point. The efficiency and robustness of the CFSL algorithm are compared through several nonlinear mathematical and structural/mechanical examples with the HL-RF and \"Finite-Step-Length\" (FSL) algorithms. Numerical results illustrated that the CFSL algorithm performs better than the HL-RF for both robust and efficient results while the CFLS is as robust as the FSL for structural reliability analysis but is more efficient.
Key Words
    reliability analysis; conjugate search direction; conjugate finite-step length; failure probability
Behrooz Keshtegar: Department of Civil Engineering, Faculty of Engineering, University of Zabol, P.B. 9861335856 Zabol, Iran

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