A Survey on Optimal Design of Civil Engineering Structural Systems

Krishnamoorthy, C. S.; Mosi, D. R.

doi:10.1080/03052157908902408

Cited by 9 publications

(1 citation statement)

References 64 publications

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“…URING THE LAST three decades significant progress has been made in the Ddevelopment of deterministic engineering optimization strategies for the design and manufacture of both monolithic and composite materials [1][2][3][4] based on the assumption of precise information pertaining to design and manufacture variables. However, in real-world problems, random or stochastic uncertainties exist more or less in every situation.…”

Section: Introductionmentioning

confidence: 99%

A Design-for-Manufacture Methodology for Incorporating Manufacturing Uncertainties in the Robust Design of Fibrous Laminated Composite Structures

Chao

Gandhi

Thompson

1993

Journal of Composite Materials

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A design-for-manufacture methodology is proposed herein which incorporates manufacturing uncertainties into an optimal design algorithm for structures fabricated with fibrous composite laminated materials. This article is the first of its kind to develop a methodology that is focused upon addressing this crucial void in composite materials technologies because variations in the manufacturing parameters are responsible for variations in the properties of the resulting engineered macrostructure and also the principal mechanical properties of the final product. The objective function for this class of stochastic optimization problems and the corresponding probabilistic constraints, which are the kernel of the formulation, are transformed into equivalent deterministic quantities using a Taylor's series expansion and principles of probability and statistics.

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Section: Introductionmentioning

confidence: 99%

A Design-for-Manufacture Methodology for Incorporating Manufacturing Uncertainties in the Robust Design of Fibrous Laminated Composite Structures

Chao

Gandhi

Thompson

1993

Journal of Composite Materials

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A cost optimized steel bridge girder design for aashto ‐ WSD and LFD

Schelling

Hsu

1989

J of Advced Transportation

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A cost optimized design method of steel bridge girders is studied by using the specifications of the American Association of State Highway and Transportation (AASHTO) Working Stress Design (WSD) method and Load Factor Design (LFD) alternates. Here, cost trade‐offs for the steel plate (e.g., the base price plus extras for size, grade, testing and inspection, etc.), stiffeners and splicing are weighed throughout the entire span to minimize the objective function. The method is then applied to a set of over 30 steel bridge structures which collected from various state bridge inventories in order to obtain optimal cost configurations for both WSD and LFD methods. These results are analyzed by a linear regression model to define relationships between cost differences and bridge lengths. From these comparisons, conclusions are drawn to provide the guidelines. It is believed that effective application of these guidelines should lead to more economical designs, especially under the LFD method.

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An algorithm for engineering design optimization

Belsare

Arora

1983

Numerical Meth Engineering

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SUMMARYIn this paper a new concept for development of algorithms for optimal design of engineering systems is presented. The basic idea is to use upper and lower bounds on optimum cost to develop iterative search strategies. The main feature of the concept is that it does not rely on one-dimensional search to compute a step size at any design iteration. Implication of the feature is that the algorithms based on this concept require evaluation of constraint functions only once at any design iteration. This is highly desirable for optimal design of engineering systems because evaluation of functions for such systems is very expensive due to their implicit dependence on design variables. An algorithm based on the new concept is derived in the paper. Several new step sizes are introduced and their relation to proper reduced optimal design problems are presented. A new step size based on the constant cost requirement at some design iterations is introduced. Numerical aspects for the algorithm are also presented. Based on the new algorithm, a general-purpose computer code GRP2 is developed. The code is used to solve several problems to gain experience and insight for the algorithm. Numerical experience with examples is discussed. It is concluded that algorithms based on bounding optimum cost have substantial potential for applications in optimal design of engineering systems.

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A Survey on Optimal Design of Civil Engineering Structural Systems

Cited by 9 publications

References 64 publications

A Design-for-Manufacture Methodology for Incorporating Manufacturing Uncertainties in the Robust Design of Fibrous Laminated Composite Structures

A Design-for-Manufacture Methodology for Incorporating Manufacturing Uncertainties in the Robust Design of Fibrous Laminated Composite Structures

A cost optimized steel bridge girder design for aashto ‐ WSD and LFD

An algorithm for engineering design optimization

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