Control of underground blast induced building vibration by shape-memory-alloy rubber bearing (SMARB)

Abstract

Summary This paper focuses on the performance of shape‐memory‐alloy rubber bearings (SMARBs) compared to conventional lead‐plug or New‐Zealand (N‐Z) bearings in control of building vibration due to underground blast induced ground motion (BIGM). The performance is evaluated with regard to maximum acceleration and isolator displacement obtained by nonlinear time history analysis. In doing so the Bouc–Wen's model is used to represent the nonlinear behaviour of the N‐Z bearing and the superelastic behaviour of nickel–titanium‐based shape‐memory alloy is represented by the Graesser–Cozzarelli model. The underground BIGM input is modelled by exponentially decaying function. It is observed that though the N‐Z bearing is fairly effective in controlling the structural accelerations due to BIGM without excessive bearing displacements, there remains a problem with the residual bearing displacements. The latter, however, is found to be dealt with very effectively by the SMARB. Furthermore, the procedure to obtain the optimum design parameters of the base isolators under study is obtained by optimizing two mutually conflicting objective functions, that is, the minimization of peak acceleration as well as peak bearing displacement by converting the multiobjective optimization problem to a single composite objective function. The improved and robust control performance of SMARB compared to N‐Z bearing is elucidated through numerical study by considering a five‐storied shear building frame.

Hysteretic active control of base-isolated buildings

“…For assessing the performance of the proposed active control scheme, a base‐isolated five‐story building structure described by Ramallo et al (based on a previous work by Kelly et al) is considered. This model has been intensively utilized by many researchers at the structural dynamics and control fields …”

“…This model has been intensively utilized by many researchers at the structural dynamics and control fields. 41,42 For this setup, the mass, stiffness, and damping matrices are given as in Equations 2-4, 23 where the masses, stiffness, and damping coefficients of each floor are detailed in Table 1. The Bouc-Wen parameters in Equations 5-6 that model the base isolator are given in Table 2.…”

Manufacturing and performance of a novel self‐centring damper with shape memory alloy ring springs for seismic resilience

“…The experimental results demonstrated that the dampers were effective in reducing both the peak and residual deformation of the structure subjected to strong earthquakes. Apart from damping systems, SMAs have also been considered in other seismic resistant devices and members, including braces, beam‐to‐column connections, base isolators, and bridges …”

“…The experimental results demonstrated that the dampers were effective in reducing both the peak and residual deformation of the structure subjected to strong earthquakes. Apart from damping systems, SMAs have also been considered in other seismic resistant devices and members, including braces, [14][15][16][17] beam-to-column connections, [18][19][20][21][22][23][24] base isolators, 25,26 and bridges. 27,28 Although the wire form of SMA has proven to be effective in providing energy dissipation and self-centring capability, there are still practical issues such as difficulty of gripping (especially when a large number of wires are to be included) and vulnerability to fracture at the gripping region due to local stress concentration.…”

Experimental investigation on hysteretic behavior of a shear thickening fluid damper

“…Compared with electrorheological fluid, magnetorheological fluid (MRF), and shape memory alloy, shear thickening fluid (STF) is another smart material with excellent performance given that the characteristics of STF depend on its shear strain rate. Under high strain rate loading, the apparent viscosity of the contact interface changes dramatically, even from liquid phase to solid phase .…”