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Vibrating barrier: a novel device for the passive control of structures under ground motion.

Cacciola P, Tombari A - Proc. Math. Phys. Eng. Sci. (2015)

Bottom Line: The ViBa is a structure buried in the soil and detached from surrounding buildings that is able to absorb a significant portion of the dynamic energy arising from the ground motion.Numerical and experimental analyses are performed in order to investigate the efficiency of the device in mitigating the effects of ground motion waves on the structural response.A significant reduction in the maximum structural acceleration of 87% has been achieved experimentally.

View Article: PubMed Central - PubMed

Affiliation: School of Environment and Technology, University of Brighton , Brighton BN2 4GJ, UK.

ABSTRACT

A novel device, called vibrating barrier (ViBa), that aims to reduce the vibrations of adjacent structures subjected to ground motion waves is proposed. The ViBa is a structure buried in the soil and detached from surrounding buildings that is able to absorb a significant portion of the dynamic energy arising from the ground motion. The working principle exploits the dynamic interaction among vibrating structures due to the propagation of waves through the soil, namely the structure-soil-structure interaction. The underlying theoretical aspects of the novel control strategy are scrutinized along with its numerical modelling. Closed-form solutions are also derived to design the ViBa in the case of harmonic excitation. Numerical and experimental analyses are performed in order to investigate the efficiency of the device in mitigating the effects of ground motion waves on the structural response. A significant reduction in the maximum structural acceleration of 87% has been achieved experimentally.

No MeSH data available.


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Transfer functions of the undamped system for the (a) structure and (b) ViBa obtained for different coupling stiffness values.
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RSPA20150075F7: Transfer functions of the undamped system for the (a) structure and (b) ViBa obtained for different coupling stiffness values.

Mentions: In this section, numerical analyses are performed to scrutinize the efficiency of the ViBa. The goal is to reduce the vibrations of the structure subjected to harmonic excitation with circular frequency ω0 equal to its first fundamental frequency, i.e. ωstr=ω0=22.62 rad s−1, that would otherwise cause severe damage due to the induced condition of resonance. The undamped case is addressed first. Figure 6 shows the modulus of the transfer function response of the structure, /H(ω)/, and of the ViBa, /HViBa(ω)/, obtained by calibrating the mass of the ViBa, kViBa, by means of equation (4.18) for three mass ratios, mViBa/m={0.5;1;1.5}, with comparison with the response of the uncoupled single structure. Each curve converges at the same value, /H(ω)/=0, at the target circular frequency, ω0=22.62 rad s−1. Therefore, in undamped systems the ViBa is able to absorb 100% of the vibrations of the structure. Figure 7 depicts the modulus of the transfer function response of the structure and the ViBa obtained for different values of the coupling interaction stiffness, kSSSI. Three cases are reported, specifically the single structure when kSSSI=0, the coupled structure with ViBa when kSSSI=315 N m−1, i.e. the spring value used for the prototype, and the limit case of (e.g. the same foundation for ViBa and the structure). The case obtained for kSSSI=0 (e.g. very long spacing between the ViBa and the structure) is identical to the uncoupled structure.Figure 6.


Vibrating barrier: a novel device for the passive control of structures under ground motion.

Cacciola P, Tombari A - Proc. Math. Phys. Eng. Sci. (2015)

Transfer functions of the undamped system for the (a) structure and (b) ViBa obtained for different coupling stiffness values.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4528655&req=5

RSPA20150075F7: Transfer functions of the undamped system for the (a) structure and (b) ViBa obtained for different coupling stiffness values.
Mentions: In this section, numerical analyses are performed to scrutinize the efficiency of the ViBa. The goal is to reduce the vibrations of the structure subjected to harmonic excitation with circular frequency ω0 equal to its first fundamental frequency, i.e. ωstr=ω0=22.62 rad s−1, that would otherwise cause severe damage due to the induced condition of resonance. The undamped case is addressed first. Figure 6 shows the modulus of the transfer function response of the structure, /H(ω)/, and of the ViBa, /HViBa(ω)/, obtained by calibrating the mass of the ViBa, kViBa, by means of equation (4.18) for three mass ratios, mViBa/m={0.5;1;1.5}, with comparison with the response of the uncoupled single structure. Each curve converges at the same value, /H(ω)/=0, at the target circular frequency, ω0=22.62 rad s−1. Therefore, in undamped systems the ViBa is able to absorb 100% of the vibrations of the structure. Figure 7 depicts the modulus of the transfer function response of the structure and the ViBa obtained for different values of the coupling interaction stiffness, kSSSI. Three cases are reported, specifically the single structure when kSSSI=0, the coupled structure with ViBa when kSSSI=315 N m−1, i.e. the spring value used for the prototype, and the limit case of (e.g. the same foundation for ViBa and the structure). The case obtained for kSSSI=0 (e.g. very long spacing between the ViBa and the structure) is identical to the uncoupled structure.Figure 6.

Bottom Line: The ViBa is a structure buried in the soil and detached from surrounding buildings that is able to absorb a significant portion of the dynamic energy arising from the ground motion.Numerical and experimental analyses are performed in order to investigate the efficiency of the device in mitigating the effects of ground motion waves on the structural response.A significant reduction in the maximum structural acceleration of 87% has been achieved experimentally.

View Article: PubMed Central - PubMed

Affiliation: School of Environment and Technology, University of Brighton , Brighton BN2 4GJ, UK.

ABSTRACT

A novel device, called vibrating barrier (ViBa), that aims to reduce the vibrations of adjacent structures subjected to ground motion waves is proposed. The ViBa is a structure buried in the soil and detached from surrounding buildings that is able to absorb a significant portion of the dynamic energy arising from the ground motion. The working principle exploits the dynamic interaction among vibrating structures due to the propagation of waves through the soil, namely the structure-soil-structure interaction. The underlying theoretical aspects of the novel control strategy are scrutinized along with its numerical modelling. Closed-form solutions are also derived to design the ViBa in the case of harmonic excitation. Numerical and experimental analyses are performed in order to investigate the efficiency of the device in mitigating the effects of ground motion waves on the structural response. A significant reduction in the maximum structural acceleration of 87% has been achieved experimentally.

No MeSH data available.


Related in: MedlinePlus