Topology optimization of the fiber-reinforcement retrofitting existing structures

Conventionally, heterogeneous object modeling methods paid limited attention to the concurrent modeling of geometry design and material composition distribution. Procedural method was normally employed to generate the geometry first and then determine the heterogeneous material distribution, which ignores the mutual influence. Additionally, limited capability has been established about irregular material composition distribution modeling with strong local discontinuities. This article overcomes these limitations by developing the computer-aided design-computer-aided engineering associative feature-based heterogeneous object modeling method. Level set functions are applied to model the geometry within computer-aided design module, which enables complex geometry modeling. Finite element mesh is applied to store the local material compositions within computer-aided engineering module, which allows any local discontinuities. Then, the associative feature concept builds the correspondence relationship between these modules. Additionally, the level set geometry and material optimization method are developed to concurrently generate the geometry and material information which fills the contents of the computer-aided design-computer-aided engineering associative feature model. Micro-geometry is investigated as well, instead of only the local material composition. A few cases are studied to prove the effectiveness of this new heterogeneous object modeling method. KeywordsComputer-aided design-computer-aided engineering associative feature, heterogeneous object modeling, level set, geometry and material optimization Date

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“…Based on the homogenization theory, the homogenized elasticity tensor of 2D fiber-reinforced material could be determined 43,44 as…”

Section: Braidingmentioning

confidence: 99%

“…Concerning the flexibility of the fiber orientation as shown in Figure 2(b), the transformation tensor T(u) is needed to conduct the coordinate transformation 43,44 T…”

Section: Braidingmentioning

confidence: 99%

Computer-aided design–computer-aided engineering associative feature-based heterogeneous object modeling

Liu

Duke

2015

Advances in Mechanical Engineering

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“…Instead, the effect of the seismic action was assessed comparing two models: the first one is based on a linear elastic constitutive approach and subjected to modal dynamic analysis with a design spectrum, carried out through SAP2000 software [11]; the second one, having more sophisticated constitutive laws, was developed adopting a distributed plasticity approach and then subjected to a series of nonlinear dynamic analyses, carried out within the open platform OpenSees [12]. Although high-fidelity finite element (FE) models commonly used for seismic analysis and/or topology optimization of steel and reinforced concrete structural systems and components [13][14][15][16][17][18][19][20][21] are able to reproduce local stress/strain concentrations, the computational effort increases tremendously. Therefore, such an approach is currently unfeasible for design office use, especially whether the response of entire super-tall mega-frame buildings with their key structural components has to be assessed in a nonlinear dynamic fashion.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling and Seismic Analysis of Tall Steel Buildings with Braced Frame Systems

Mazzotta

Brunesi

Nascimbene

2016

Period. Polytech. Civil Eng.

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The following paper presents the design and verification steps of tall steel frame structures with braced core, belt and outrigger trusses. The two case study structures refer to sky scrapers of 180m and 300m respectively, located in Istanbul, Turkey Keywords tall steel buildings, concentrically braced frames, response spectrum analysis, nonlinear dynamic analysis IntroductionThe design of a tall building, characterized by definition by its significant slenderness and a long vibration period [1-8] must pay particular attention not only to vertical loads, but also to the horizontal ones, such as wind and earthquakes, which require greater control of displacement and structural strength, since they may induce significant oscillations and effects of the second order are no longer negligible. The structural systems designed to withstand these actions, are the bracing structures which by their nature, affect the choice of the entire structural scheme. It should be highlighted that, since this paper focuses on buildings that are 180m tall, at least, to calculate the wind action, it was not possible to refer to European codes, because they do not specify how to study the effects of such an action when building is taller than 100m. Therefore, it was necessary to refer to American guidelines and standards [9,10] that were assumed as an alternative approach, as shown in the following sections. Instead, the effect of the seismic action was assessed comparing two models: the first one is based on a linear elastic constitutive approach and subjected to modal dynamic analysis with a design spectrum, carried out through SAP2000 software [11]; the second one, having more sophisticated constitutive laws, was developed adopting a distributed plasticity approach and then subjected to a series of nonlinear dynamic analyses, carried out within the open platform OpenSees [12]. Although high-fidelity finite element (FE) models commonly used for seismic analysis and/or topology optimization of steel and reinforced concrete structural systems and components [13][14][15][16][17][18][19][20][21] are able to reproduce local stress/strain concentrations, the computational effort increases tremendously. Therefore, such an approach is currently unfeasible for design office use, especially whether the response of entire super-tall mega-frame buildings with their key structural components has to be assessed in a nonlinear dynamic fashion. In light of this, mechanical idealizations and fiber-based representations were proven to be a promising and viable approach when used to predict the nonlinear behavior of such systems at a global level, as shown by several comparisons against experimental tests [22][23][24][25][26][27].

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“…model considering Drucker-Prager criteria and post yielding response. In addition, Bruggi and Taliercio [17] studied the topology optimization problem of fiber-reinforcement retrofitting existing structures. Gaynor et al [18] employed a hybrid truss-continuum topology optimization to design the STM of reinforced and prestressed concrete members.…”

Section: Introductionmentioning

confidence: 99%

Topology optimization of reinforced concrete structures considering control of shrinkage and strength failure

Luo

Wang

Zhou

et al. 2015

Computers & Structures

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Topology optimization of the fiber-reinforcement retrofitting existing structures

Cited by 46 publications

References 58 publications

Computer-aided design–computer-aided engineering associative feature-based heterogeneous object modeling

Computer-aided design–computer-aided engineering associative feature-based heterogeneous object modeling

Numerical Modeling and Seismic Analysis of Tall Steel Buildings with Braced Frame Systems

Topology optimization of reinforced concrete structures considering control of shrinkage and strength failure

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