Base-Isolation of a Rocking Object on a Rocking Pedestal: Response to Pulse-Type Ground Motion

Bisol, Giacomo Destro; DeJong, Matthew J.; Liberatore, Domenico; Sorrentino, Luigi

doi:10.1007/978-3-031-21187-4_62

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…This boundary condition delivers a system with two degrees of freedom (DOFs), similar to the one observed in a stack of two bodies that are free at the top, as studied by Psycharis [15] and Spanos et al [16]. Therefore, the complexity of the problem increases as different patterns (or rocking modes) are possible [17].…”

Section: Introductionmentioning

confidence: 85%

Two-Bodies Vertical Spanning Wall Restrained by an Elastic Tie Rod

Destro Bisol,

Prajapati,

AlShawa

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In unreinforced masonry structures, one of the most dangerous events that can occur during earthquakes is an out-of-plane mechanism. The use of tie rods can be a powerful tool in preventing these types of failure mechanisms, especially given the simplicity and the low cost of the strengthening intervention. When the wall is restrained to a horizontal element, such as a tie rod, its response significantly changes. The collapse, in this case, could take place for slipping / failure of the tie rod or for overturning of the wall, following the formation of a crack at an intermediate height between the base and the top. In the literature are present models accounting for geometric non-linearities in the case of a wall rigidly restrained at the top. The same can be stated for the model free at the top, which considers four different patterns. No model accounting for all previously mentioned phenomena while also presenting a non-rigid restraint, is available. Therefore, a model formed by two bodies of finite thickness and a flexible restraint at the top capable to capture the dynamic response of the system is proposed here. The model is characterized by four motion patterns, and it can detect the transition among them, as well as the collapse mechanisms which can occur for overturning of the entire wall or of the upper body alone. Explanatory time-histories describe the complex response of the system to recorded ground motion, pointing out its highly non-linear behavior. Finally, the investigation on the influence of the tie rods diameter confirms that the main advantages are obtained for tie rods characterized by a large cross-section.

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Section: Introductionmentioning

confidence: 85%

Two-Bodies Vertical Spanning Wall Restrained by an Elastic Tie Rod

Destro Bisol,

Prajapati,

AlShawa

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Further information about transitions due to impacts can be found in Appendix , while the postimpact velocities for every possible pattern change are presented in Destro Bisol et al. (2023).…”

Section: Pattern Changementioning

confidence: 99%

Analysis of seismically‐isolated two‐block systems using a multi–rocking‐body dynamic model

Bisol

DeJong

Liberatore

et al. 2023

Computer aided Civil Eng

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A novel multibody rocking model is developed to investigate the dynamic response of two stacked rigid blocks placed on a linear base isolation device. The model is used to investigate the dynamic response of a realistic statue-pedestal system subject to pulse-like ground motions. The analysis shows that, in general, base isolation increases the safety level of the rocking system. However, for large period pulses or small size blocks, the isolator can amplify the ground motion, resulting in a lower minimum overturning acceleration than for the nonisolated system. Further, the amplification or shock spectrum of a linear mass-dashpotspring oscillator, was found to be the reciprocal of the minimum nondimensional overturning acceleration of the investigated rocking system. Novel rocking spectra are obtained by normalizing the frequency of the pulse by the frequency of the isolator. The analysis also demonstrates how the dynamic response of the two stacked blocks is equivalent to that of a single-block configuration coincident with the whole system assumed monolithic or the upper block alone, whichever is more slender.

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“…The aim of this project is to develop a base isolation system for the protection of artworks from traffic and earthquake vibrations integrated with a dynamic monitoring system, based on fibre Bragg grating sensors, designed to detect the exceeding of critical amplitude and frequency vibration thresholds. Although the application of base isolation to protect buildings from earthquakes was extensively explored in the past [9], use to safeguard museum objects is less frequent [10,11] and implementation against traffic vibrations is almost unheard of. The "Sarcophagus of the Spouses" dates back to the 6th century b.C., is made of terracotta and was digged out at the end of the 19th century in Cerveteri, Italy [12].…”

Section: Introductionmentioning

confidence: 99%

Structure From Motion Survey of Statue for Finite Element Modelling

Vincenti,

Caponero,

Lamonaca

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Iconic sculptures are a fundamental part of the cultural heritage of a country, being also a crucial tourism pull factor for the museums housing them. However, they are frequently rather antique, damaged during the elapsed centuries and often made of fragile materials. Moreover, they can be exposed to substantial natural and anthropic hazards, such as earthquake and traffic vibrations. This is also the case of the "Sarcophagus of the Spouses" at the National Etruscan Museum of Villa Giulia in Rome, Italy, which is exposed to the vibrations generated by a surface tramway line and an underground railway line. The multidisciplinary MONALISA project will design a base isolation system starting from the finite element modelling of the statue, whose geometry is however rather complex and whose location is within a glass case. Therefore, a contactless survey procedure was necessary and a low-cost structure from motion technique delivered a geometric mesh, which was revised and simplified to be imported in a finite element code. The finite element model was then used to perform preliminary dynamic modal analyses, to be further calibrated with ambient vibration data.

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Base-Isolation of a Rocking Object on a Rocking Pedestal: Response to Pulse-Type Ground Motion

Cited by 4 publications

References 8 publications

Two-Bodies Vertical Spanning Wall Restrained by an Elastic Tie Rod

Two-Bodies Vertical Spanning Wall Restrained by an Elastic Tie Rod

Analysis of seismically‐isolated two‐block systems using a multi–rocking‐body dynamic model

Structure From Motion Survey of Statue for Finite Element Modelling

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