Coupling Response Surface and Differential Evolution for Parameter Identification Problems

Vincenzi, Loris; Savoia, Marco

doi:10.1111/mice.12124

Cited by 58 publications

(34 citation statements)

References 53 publications

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“…They aim at evaluating those individuals that potentially have a good prediction of the objective function value. The introduction of a second-order surrogate in the Differential Evolution (DE) algorithm is proposed in [18].…”

Section: The De-s Algorithmmentioning

confidence: 99%

Dynamic Behaviour of the San Felice Sul Panaro Fortress: Experimental Tests and Model Updating

Forghieri¹,

Bassoli²,

Vincenzi³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This paper describes the experimental tests and numerical analyses performed to characterize the dynamic behaviour of the principal tower of the San Felice sul Panaro Fortress (Modena, Italy). After the Emilia earthquake that occurred in 2012, the Fortress reported serious damage, such as severe cracks on the walls and collapses of several towers and the roof. As a part of a research that aims at evaluating the vulnerability of the Fortress and designing retrofitting interventions, full-scale ambient vibration tests were performed to evaluate the dynamic properties of the principal tower. Afterwards, a Finite Element (FE) model is calibrated to obtain a good match between the numerical and experimental modal properties. The optimization process is carried out through an improved surrogate-assisted evolutionary strategy. Due to the serious damage of the Fortress, the effective stiffness of the cracked masonry and the efficiency of connection at the interface between the principal tower and the rest of the Fortress are considered the main uncertain quantities to be calibrated. A multi-objective optimization is performed, considering the frequency and mode shape residuals. These are defined as the difference between experimental and numerical modal properties. The multi-objective optimization is reduced to a series of a single-objective optimization adopting the weighted sum method. The set of optimal solutions that form the Pareto front is obtained performing the optimization for different values of the weighting factors. Then, two criteria are used and compared in order to find the preferred solution among the Pareto front solutions. Finally, a comparison of the identified structural parameters obtained varying the weighting factors for natural frequencies and mode shapes in the optimization process is presented, highlighting the importance of a proper choice of the weighting factors.

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Section: The De-s Algorithmmentioning

confidence: 99%

Dynamic Behaviour of the San Felice Sul Panaro Fortress: Experimental Tests and Model Updating

Forghieri¹,

Bassoli²,

Vincenzi³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Recently, they received considerably increasing interest in reducing the computational effort in optimization problems, mainly when the evaluation of the objective function is highly time consuming [14]. In this work, the socalled DE-Q algorithm is adopted [9,10]; it combines the robustness of the DE algorithm with the computational efficiency due to a second-order surrogate approximation of the objective function. The optimal parameters are obtained through the minimization of an objective function defined as the relative error between numerical and experimental modal frequencies and mode shapes.…”

Section: Finite Element Model and Model Updatingmentioning

confidence: 99%

“…In these models, vertical dynamic actions depend on the pacing frequency, the walking (or running) speed, the step length, the number of people involved and the synchronous action modelling. To apply the first approach, a finite element model is developed and calibrated so that the numerical dynamic predictions agree with the experimental modal properties [9,10]. Both the updated and the non-calibrated models are used to evaluate the dynamic response of the footbridge when subjected to pedestrian loads.…”

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confidence: 99%

Dynamic Analyses of a Curved Cable-Stayed Footbridge Under Human Induced Vibrations: Numerical Models and Experimental Tests

Bassoli¹,

Gambarelli²,

Simonini³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. Nowadays, pedestrian bridges are increasingly lively and slender structures due to the development of improved structural materials and aesthetic requirements. As a result of INTRODUCTIONOver the last decades, cable-stayed bridges and footbridges have reached great importance and popularity thanks to the ease of construction, the economical convenience and the reduction of the deck bending moments due to the benefit of cables. Nevertheless, footbridges are generally slender structures due to the structural solutions adopted even for aesthetic requirements and the using of deformable elements, and so they are increasingly sensitive to dynamic vibrations induced by pedestrian actions [1,2] that can compromise the comfort serviceability conditions. Hence, the full assessment of footbridge dynamic behaviour with reference to pedestrian dynamic amplifications is a topical issue in the vibration serviceability analyses [3][4][5].Accurate FE models are often needed to investigate the dynamic behaviour of these kinds of structures and to reproduce the pedestrian effects through dynamic analyses considering adequate human-induced load models. However, the complex shapes of these structures usually involve difficulties in accurate structural modelling and simulation. Therefore, model updating procedures are required to develop reliable models starting from the comparison between the structural dynamic behaviour investigated through dynamic tests and its numerical model response [6].This paper is a part of a research that aims to characterize the dynamic behaviour of a curved cable-stayed footbridge subjected to pedestrian loads starting from experimental tests and numerical dynamic analyses. The case study is the Pasternak footbridge that is about 270 meters long and 3 meters wide and it crosses an important freeway in Modena (Italy). It is composed of two steel towers 18 meters high that support the steel-concrete deck by means of 6 pairs of cables.First of all, the dynamic behaviour of the footbridge is investigated thanks to an experimental campaign performed by means of an advanced MEMS-based SHM system [7]. Through the dynamic tests the accelerations due to ambient vibrations (wind) are recorded and the modal parameters (frequencies, mode shapes and damping ratios) are identified [8].To study the dynamic behaviour of the footbridge subjected to pedestrian loads, several experimental tests were performed with different-sized groups crossing the footbridge running, free or synchronized walking with different pacing frequencies. To simulate dynamic loading conditions due to a single pedestrian or a crowd of people crossing the structure, two mathematical models are examined. In these models, vertical dynamic actions depend on the pacing frequency, the walking (or running) speed, the step length, the number of people involved and the synchronous action modelling. To apply the first approach, a finite element model is developed and calibrated so that the numerical dynamic predictions agree with the experimental ...

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“…Apart from real‐time experiments, many algorithms have been developed and tested for applications such as SHM (Hampshire and Adeli, ; Park et al., ; Park et al., ; Amezquita‐Sanchez and Adeli, , ); identification of the structural parameters (Sun et al., ; Yuen and Mu, ; Vincenzi and Savoia; ; Sirca and Adeli, ; Perez‐Ramirez et al., ); and for modal updating (Oh et al., ; Sun and Betti, ; Boscato et al., ; Shabbir and Omenzetter, ). These algorithms assist assessing the health of the structure and also the parametric changes associated with the deterioration in health, making the infrastructure intelligent (Adeli and Jiang, ; Qarib and Adeli, , ).…”

Section: Introductionmentioning

confidence: 99%

Effect of Road Surface, Vehicle, and Device Characteristics on Energy Harvesting from Bridge–Vehicle Interactions

Cahill

Jaksic

Keane

et al. 2016

Computer aided Civil Eng

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Energy harvesting to power sensors for structural health monitoring (SHM) has received huge attention worldwide. A number of practical aspects affecting energy harvesting and the possibility of health monitoring directly from energy harvesters is investigated here. The key idea is the amount of power received from a damaged and an undamaged structure varying and the signature of such variation can be used for SHM. For this study, a damaged bridge and an undamaged bridge are considered with harvesters located at different positions and the power harvested is accessed numerically to determine how energy harvesting can act as a damage detector and monitor. Bridge–vehicle interaction is exploited to harvest energy. For a damaged bridge, a bilinear breathing crack is considered. Variable surface roughness according to ISO 8606:1995(E) is considered such that the real values can be considered in the simulation. The possibility of a drive‐by type health monitoring using energy harvesting is highlighted and the effects of road surface on such monitoring are identified. The sensitivity of the harvester health monitoring to locations and extents of crack damage are reported. This study investigates the effects of multiple harvesters and the effects of vehicular parameters on the harvested power. Continuous harvesting over a length of the bridge is considered semianalytically. A comparison among the numerical simulations, detailed finite element analysis, and experimental results emphasizes the feasibility of the proposed method.

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Coupling Response Surface and Differential Evolution for Parameter Identification Problems

Cited by 58 publications

References 53 publications

Dynamic Behaviour of the San Felice Sul Panaro Fortress: Experimental Tests and Model Updating

Dynamic Behaviour of the San Felice Sul Panaro Fortress: Experimental Tests and Model Updating

Dynamic Analyses of a Curved Cable-Stayed Footbridge Under Human Induced Vibrations: Numerical Models and Experimental Tests

Effect of Road Surface, Vehicle, and Device Characteristics on Energy Harvesting from Bridge–Vehicle Interactions

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