Analytical and Numerical Shape Optimization of a Class of Structures under Mass Constraints and Self-Weight

San, Bingbing; Waisman, Haim; Harari, Isaac

doi:10.1061/(asce)em.1943-7889.0001693

Cited by 28 publications

(11 citation statements)

References 41 publications

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“…α exact,i is different for each ground motion and can be obtained only through an iterative trial-and-error procedure of nonlinear time history analyses. A number of multi-purpose algorithms existing in the literature may be used to efficiently conduct such an iterative process [28,29]. In this study, α exact,i was calculated using the pattern search method (PSM), which belongs to the direct search methodology for optimization of n-dimensional functions [30].…”

Section: Comparison Between Proposed and "Exact" Distributionsmentioning

confidence: 99%

“…PSM has been used in previous studies on optimization of buildings with dampers [31] and on damage control of buildings [32,33]. There are other approaches such as the gradient-based method or genetic algorithms used successfully in structural optimization problems [28,29] that could potentially be more efficient to reach the "exact" optimum distribution. Nevertheless, it is out of the scope of this study to determine the most efficient method.…”

Section: Comparison Between Proposed and "Exact" Distributionsmentioning

confidence: 99%

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Optimum Strength Distribution for Structures with Metallic Dampers Subjected to Seismic Loading

Donaire-Ávila

Benavent‐Climent

2020

Metals

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A key aspect of the seismic design of structures is the distribution of the lateral strength, because it governs the distribution of the cumulative plastic strain energy (i.e., the damage) among the stories. The lateral shear strength of a story i is commonly normalized by the upward weight of the building and expressed by a shear force coefficient αi. The cumulative plastic strain energy in a given story i can be normalized by the product of its lateral strength and yield displacement, and expressed by a plastic deformation ratio ηi. The distribution αi/α1 that makes ηi equal in all stories is called the optimum yield-shear force distribution. It constitutes a major aim of design; a second aim is to achieve similar ductility demand in all stories. This paper proposes a new approach for deriving the optimum yield-shear force coefficient distribution of structures without underground stories and equipped with metallic dampers. It is shown, both numerically and experimentally, that structures designed with the proposed distribution fulfil the expected response in terms of both damage distribution and inter-story drift demand. Moreover, a comparison with other distributions described in the literature serves to underscore the advantages of the proposed approach.

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Section: Comparison Between Proposed and "Exact" Distributionsmentioning

confidence: 99%

Section: Comparison Between Proposed and "Exact" Distributionsmentioning

confidence: 99%

Optimum Strength Distribution for Structures with Metallic Dampers Subjected to Seismic Loading

Donaire-Ávila

Benavent‐Climent

2020

Metals

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“…The method described in this study is concise and clear and could be directly used in divided‐plate mold design for future radome structures. [ 14–16 ]…”

Section: Plate Divisions For a Truss Radome Surfacementioning

confidence: 99%

Design and structural analysis of a 70‐m metal space‐frame radome

Liu

2020

Structural Design Tall Build

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Summary The electrical performance of an antenna is usually affected by the stiffness, intensity, and stability of the radome structure. Thus, radome structural analysis is of great concern to designers. Taking a 70‐m radome structure to be built in the future with a 50‐m aperture antenna structure as the study platform, its mechanical behavior and electrical properties are analyzed and discussed. First, a detailed introduction regarding the method and principle of radome partitioning is presented. Based these methods, random divisions on radome plates are conducted using a specially developed program, and thereby, a whole spherical‐segment model is established. In addition, focusing on the finite element model of a steel radome structure, static mechanical, seismic response, modality, and stability analyses are performed, such that the member sections of the radome structure, adopting two kinds of materials, are determined. The results show that the mechanical properties of the structure are superior and that all indices meet the requirements in the safety evaluation. Just as noteworthy, the influencing mechanism of structural deformation of the radome on electrical performance is examined, and in particular, the reason why large deformation does not greatly degrade electrical performance is presented. Subsequently, a novel method for describing deformation is put forth to accurately estimate the effects of structural deformation on electrical performance. These achievements provide references for structural design and construction as well as maintenance of similar common metal space‐truss radomes.

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“…At present, most of the development and application of membrane materials are designed to meet the performance requirements under static force. Zhang et al [13][14][15] carried out a uniaxial tensile test and cyclic tensile test at different temperatures for coated fabric membrane materials, so as to carry out statistical analysis on its tensile strength, shear strength and tear strength, and put forward the constitutive model of coated fabric membrane materials. Hu et al [16][17] used field measurement methods to study the basic mechanical properties and energy consumption capacity of architectural membranes under different temperature environments and found that the membrane materials have the effect of safety and energy saving.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical properties of architectural coated fabrics under different temperature and excitation frequency

Zhang

et al. 2020

Polymer Composites

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The dynamic thermo-mechanical analysis test is performed on the architectural coating fabric based on the dynamic thermo-mechanical analyzer (DMA). The effects of excitation frequency, constant temperature, and dynamic temperature on the dynamic mechanical properties of architectural membrane materials are discussed. Through analysis and discussion, the various rules of damping loss factor, loss modulus, and storage modulus of architectural membrane materials in the application temperature and frequency range are obtained. As the frequency of the external excitation force increases, the storage modulus, loss modulus, and loss factor all increase, while the influence of temperature is nonlinear. Under the action of dynamic temperature and constant temperature, the difference between storage modulus and loss modulus is obvious, but the difference of loss factor is small. Due to the anisotropy of the polyester fiber substrate, the damping characteristics of the membrane material in the warp and weft yarns are different regardless of the effect of external excitation frequency or temperature. The discussion in this article provides a theoretical basis for further research on the damping characteristics of membrane materials and the vibration response of membrane structures.

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Analytical and Numerical Shape Optimization of a Class of Structures under Mass Constraints and Self-Weight

Cited by 28 publications

References 41 publications

Optimum Strength Distribution for Structures with Metallic Dampers Subjected to Seismic Loading

Optimum Strength Distribution for Structures with Metallic Dampers Subjected to Seismic Loading

Design and structural analysis of a 70‐m metal space‐frame radome

Dynamic mechanical properties of architectural coated fabrics under different temperature and excitation frequency

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