A sequential approximate programming strategy for reliability-based structural optimization

Although reliability-based structural optimization (RBSO) is recognized as a rational structural design philosophy that is more advantageous to deterministic optimization, most common RBSO is based on straightforward two-level approach connecting algorithms of reliability calculation and that of des...

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Published in:Computers & structures Vol. 84; no. 21; pp. 1353 - 1367
Main Authors: Cheng, Gengdong, Xu, Lin, Jiang, Lei
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01.08.2006
Elsevier Science
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ISSN:0045-7949, 1879-2243
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Abstract Although reliability-based structural optimization (RBSO) is recognized as a rational structural design philosophy that is more advantageous to deterministic optimization, most common RBSO is based on straightforward two-level approach connecting algorithms of reliability calculation and that of design optimization. This is achieved usually with an outer loop for optimization of design variables and an inner loop for reliability analysis. A number of algorithms have been proposed to reduce the computational cost of such optimizations, such as performance measure approach, semi-infinite programming, and mono-level approach. Herein the sequential approximate programming approach, which is well known in structural optimization, is extended as an efficient methodology to solve RBSO problems. In this approach, the optimum design is obtained by solving a sequence of sub-programming problems that usually consist of an approximate objective function subjected to a set of approximate constraint functions. In each sub-programming, rather than direct Taylor expansion of reliability constraints, a new formulation is introduced for approximate reliability constraints at the current design point and its linearization. The approximate reliability index and its sensitivity are obtained from a recurrence formula based on the optimality conditions for the most probable failure point (MPP). It is shown that the approximate MPP, a key component of RBSO problems, is concurrently improved during each sub-programming solution step. Through analytical models and comparative studies over complex examples, it is illustrated that our approach is efficient and that a linearized reliability index is a good approximation of the accurate reliability index. These unique features and the concurrent convergence of design optimization and reliability calculation are demonstrated with several numerical examples.
AbstractList Although reliability-based structural optimization (RBSO) is recognized as a rational structural design philosophy that is more advantageous to deterministic optimization, most common RBSO is based on straightforward two-level approach connecting algorithms of reliability calculation and that of design optimization. This is achieved usually with an outer loop for optimization of design variables and an inner loop for reliability analysis. A number of algorithms have been proposed to reduce the computational cost of such optimizations, such as performance measure approach, semi-infinite programming, and mono-level approach. Herein the sequential approximate programming approach, which is well known in structural optimization, is extended as an efficient methodology to solve RBSO problems. In this approach, the optimum design is obtained by solving a sequence of sub-programming problems that usually consist of an approximate objective function subjected to a set of approximate constraint functions. In each sub-programming, rather than direct Taylor expansion of reliability constraints, a new formulation is introduced for approximate reliability constraints at the current design point and its linearization. The approximate reliability index and its sensitivity are obtained from a recurrence formula based on the optimality conditions for the most probable failure point (MPP). It is shown that the approximate MPP, a key component of RBSO problems, is concurrently improved during each sub-programming solution step. Through analytical models and comparative studies over complex examples, it is illustrated that our approach is efficient and that a linearized reliability index is a good approximation of the accurate reliability index. These unique features and the concurrent convergence of design optimization and reliability calculation are demonstrated with several numerical examples.
Author Xu, Lin
Jiang, Lei
Cheng, Gengdong
Author_xml – sequence: 1
  givenname: Gengdong
  surname: Cheng
  fullname: Cheng, Gengdong
  email: chenggd@dlut.edu.cn
  organization: State Key Laboratory for Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116023, China
– sequence: 2
  givenname: Lin
  surname: Xu
  fullname: Xu, Lin
  organization: State Key Laboratory for Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116023, China
– sequence: 3
  givenname: Lei
  surname: Jiang
  fullname: Jiang, Lei
  organization: Design Technology and Solutions, Intel Corporation RA3-254, 2501 NW 229th Avenue, Hillsboro, OR 97124, USA
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Issue 21
Keywords Accurate reliability index
Approximate reliability index
Reliability-based structural optimization
Concurrent convergence
Computational efficiency
Sequential approximate programming
Recurrence
Rupture
Structural reliability
Taylor series
Modeling
Optimization
Sequential method
Series expansion
Optimality criterion
Deterministic approach
Structural analysis
Linearization
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Snippet Although reliability-based structural optimization (RBSO) is recognized as a rational structural design philosophy that is more advantageous to deterministic...
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SubjectTerms Accurate reliability index
Approximate reliability index
Computational efficiency
Computational techniques
Concurrent convergence
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Mathematical methods in physics
Physics
Reliability-based structural optimization
Sequential approximate programming
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Title A sequential approximate programming strategy for reliability-based structural optimization
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