Passive and semi-active vibration control of base-isolated structure under blast loading at medium to long distances

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Ramezani Meysam; Labafzadeh Mohamad Saleh

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Journal Paper

Paper Information

Journal: AMIRKABIR JOURNAL OF CIVIL ENGINEERING Year:2022 | Volume:54 | Issue:2 Page(s): 435-456

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Information Journal Paper

Title

Passive and semi-active vibration control of base-isolated structure under blast loading at medium to long distances

Author(s)

Ramezani Meysam | Labafzadeh Mohamad Saleh | Issue Writer Certificate

Keywords

Blast Loading

Magnetorheological damper

type-2 fuzzy control algorithm

Tuned Mass Damper

Base Isolation

Abstract

With the increasing development of military weapons around the world and the variety of explosives, terrorist attacks are growing threats. The vibration control technology is well developed against natural loads. Although blast loads are different than natural loads, this technology can also be used to reduce explosive load responses. For this purpose, passive and semi-active methods, including tuned mass damper (TMD) and magnetorheological (MR) damper, have been used to reduce the vibrations caused by the blast load in the base-isolated structure. In this study, a type-2 fuzzy system has been used to determine the appropriate voltage of the MR damper so that the existing uncertainties do not adversely affect its performance. The numerical simulation of two explosives at 15m from 5 degrees of freedom system, has been performed through theoretical and empirical equations. The use of the proposed control tools along with the base isolation system showed that not only can these methods maintain the proper performance of the base isolated system but limit the displacement and possible damages at larger excitations. The comparative results show that the use of MR damper along with the base isolation system can have the best performance against blast and seismic loads. The use of this system, on average reduces the maximum drift of the stories to about 36% in blast loads, 68% in far-field earthquakes and 46% in near-field earthquakes. Furthermore, the drift of the isolation bearing is significantly limited compared to the base-isolated system with TMD.

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