A Comparative Study of First-Order Reliability Method-Based Steepest Descent Search Directions for Reliability Analysis of Steel Structures

Autor: Hamed Makhduomi, Behrooz Keshtegar, Mehdi Shahraki
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Advances in Civil Engineering, Vol 2017 (2017)
Druh dokumentu: article
ISSN: 1687-8086
1687-8094
DOI: 10.1155/2017/8643801
Popis: Three algorithms of first-order reliability method (FORM) using steepest descent search direction are compared to evaluate the reliability index of structural steel problems which are designed by the Iranian National Building code. The FORM formula is modified based on a dynamic step size which is computed based on the merit functions named modified Hasofer-Lind and Rackwitz-Fiessler (MHL-RF) method. The efficiency of the gradient, HL-RF, and MHL-RF method was compared for a bar structure under tensile capacity, a multispan beam under bending capacity, a connection under tension load, and a column under axial force. The results illustrated that the MHL-RF method is more efficient than the HL-RF and gradient method. The designed steel components by the Iranian National Building code showed good confidence levels with the reliability index in the range from 2.5 to 3.0.
Databáze: Directory of Open Access Journals
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