Simultaneous optimization approach for combined control–structural design versus the conventional sequential optimization method

Alavi, Arsalan; Dolatabadi, Mohammad; Mashhadi, Javad; Farsangi, Ehsan Noroozinejad

doi:10.1007/s00158-020-02765-3

Cited by 18 publications

(5 citation statements)

References 46 publications

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“…Thus, the structural nonlinear behaviour cannot be neglected in a reliable performance-based optimum design of NVDs (Attard 2007;Cimellaro et al 2009;Akehashi and Takewaki 2019;Idels and Lavan 2021). This is confirmed, in a broader context, by pertinent recent references in the area of performance-based design and optimization of energy dissipation devices (Alavi et al 2021;Dehghani et al 2021;Fathizadeh et al 2020Fathizadeh et al , 2021Mohammadi et al 2021). Using a linear frame assumption in these cases could lead to an underestimated structural response and, in turn, to an unconservative damping distribution violating the design constraints (Pollini et al 2018).…”

Section: Introductionmentioning

confidence: 87%

Multi-level performance-based design optimisation of steel frames with nonlinear viscous dampers

Domenico

Hajirasouliha

2021

Bull Earthquake Eng

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This paper presents a practical multi-level performance-based optimisation method of nonlinear viscous dampers (NVDs) for seismic retrofit of existing substandard steel frames. A Maxwell model is adopted to simulate the behaviour of the combined damper-supporting brace system, with a fractional power-law force–velocity relationship for the NVDs, while a distributed-plasticity fibre-based section approach is used to model the beam-column members thus incorporating the nonlinearity of the parent steel frame in the design process. The optimum height-wise distribution of the damping coefficients of NVDs satisfying given performance requirements is identified via a uniform damage distribution (UDD) design philosophy. The efficiency of the proposed multi-level performance-based design optimisation is illustrated through nonlinear time-history analysis of 3-, 7- and 12-storey steel frames under both artificial and natural spectrum-compatible earthquakes. Sensitivity analysis is performed to investigate the effects of initial height-wise damping distribution, convergence factor and uncertainty in design ground-motion prediction on the optimisation strategy. The efficiency of the final optimum design solution is also investigated by using drift-based, velocity-based, and energy-based UDD approaches to identify the most efficient performance index parameter for optimisation purposes. It is found that regardless of the selected performance parameter, the optimum damping distribution identified by the proposed methodology leads to frames exhibiting lower maximum inter-storey drift, local damage (maximum plastic rotation) and global damage index compared to an equal-cost uniform damping distribution. However, using drift-based UDD approach generally results in a better seismic performance. It is shown that the proposed UDD optimisation method can be efficiently used to satisfy multiple performance objectives at different intensity levels of the earthquake excitation, in line with performance-based design recommendations of current seismic codes. The proposed method is easy to implement for practical design purposes and represents a simple yet efficient tool for optimum seismic retrofit of steel frames with NVDs.

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Section: Introductionmentioning

confidence: 87%

Multi-level performance-based design optimisation of steel frames with nonlinear viscous dampers

Domenico

Hajirasouliha

2021

Bull Earthquake Eng

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“…In this work, co-design is shown to be helpful for the integration of energy management optimization along with optimal vehicle sizing for a hybrid electric propulsion aircraft. -In civil engineering applications, building structures for earthquake resistance can be done through simultaneous design and control [2]. This type of structure uses active controls to prevent structural damage due to seismic activity.…”

Section: Introductionmentioning

confidence: 99%

Computation of Direct Sensitivities of Spatial Multibody Systems With Joint Friction

Verulkar

Sandu

Dopico

et al. 2022

Journal of Computational and Nonlinear Dynamics

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Friction exists in most mechanical systems and may have a major influence on the dynamic performance of the system. The incorporation of friction in dynamic systems has been a subject of active research for several years owing to its high non-linearity and its dependence on several parameters. Consequently, optimization of dynamic systems with friction becomes a challenging task. Gradient-based optimization of dynamical systems is a prominent technique for optimal design and requires the computation of model sensitivities with respect to the design parameters. The novel contribution of this paper is the derivation of the analytical methodology for the computation of direct sensitivities for smooth multibody systems with joint friction using the Lagrangian index-1 formulation. System dynamics have been computed using two different friction models; the Brown and McPhee, and the Gonthier et al. model. The methodology proposed to obtain model sensitivities has also been validated using the complex finite difference method. A case study has been conducted on a spatial multibody system to observe the effect of friction on the dynamics and model sensitivities, compare sensitivities with respect to different parameters and demonstrate the numerical and validation aspects. Since design parameters can have very different magnitudes and units, the sensitivities have been scaled with the parameters for comparison. Finally, a discussion has been presented on the interpretation of the case study results. Due to incorporation of joint friction, ‘jumps’ or discontinuities are observed in the model sensitivities akin to those observed for hybrid dynamical systems.

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“…Rigorous research has been carried out to use smart systems for smart structures to quantify a building's acceleration to ensure that the building remains serviceable without causing disturbing motions to its occupants is presented in the article [10]. Simple methods for the structural analysis are needed; so Alavi et al [11] developed a framework for combined structural and control optimization considering structural mass and linear quadratic regulator performance index as objectives. This approach combined structural and control variables as a single objective function linearly, Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1 External structural system [4] and the variable neighborhood search (VNS) metaheuristic method was adopted because of complexity. This combined method adopted by the authors in [11] delivers superior dynamic performance compared to the sequentially optimized cases. Research needs to be developed for finding the structural forms and effective ways to reduce uncontrolled lateral forces.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Outrigger Structural System: A State-of-the-Art Review

2021

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This paper presents the development of the outrigger structural system from the conventional outrigger to damped outrigger concepts. Outrigger structural system development from the conservative design as a rigid connection to a virtual connection with passive control, active control system, semi-active control system to hybrid control system is deliberated. Following brief overviews on history of outriggers, types of the outrigger, analysis of tall buildings without outriggers, formulation of equations for outrigger structure to simplify analysis are elaborated. Different approach to locate optimum positioning of outriggers in tall structure is elucidated. Analysis of outrigger to study its behavior in high-rise buildings using different methods is stated, and review on the damped outrigger system is explicated. This paper tries to highlight the advantages of outrigger structure with semi-active control and performance enhancement of the outrigger system with the effective devices, and enhanced results are also depicted. This review also paves a way for the new area of research in structural control with the incorporation of smart devices and smart technology.

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Simultaneous optimization approach for combined control–structural design versus the conventional sequential optimization method

Cited by 18 publications

References 46 publications

Multi-level performance-based design optimisation of steel frames with nonlinear viscous dampers

Multi-level performance-based design optimisation of steel frames with nonlinear viscous dampers

Computation of Direct Sensitivities of Spatial Multibody Systems With Joint Friction

Evolution of Outrigger Structural System: A State-of-the-Art Review

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