Abstract
In this study, the possibility to use Horasan mortar as a sliding interface material for pure friction aseismic isolation system is investigated. Both experimental and numerical studies are conducted to examine the effectiveness of using this material in structural isolation systems of buildings with no overturning moment, as it has shown some attractive experiences in time based on the existing related literature. Responses of four storey lightweight building are numerically investigated by finite element modelling in MATLAB; whereas the University Consortium on Instructional Shake Table (UCIST) is used to study the responses of the same building during experimental works. Comparison of both studies is shown to be in a good agreement in terms of resulting structural response accelerations, velocity and displacements. Approximately 28 - 31 % reduction of base floor acceleration is achieved; and the maximum sliding velocity and displacement are found to lie between 0.33-0.45 m/sec and 0.0353-0.0559 m respectively; which fall within the recommended standards’ limits. As a result, these findings demonstrate the effectiveness of using Horasan mortar as friction interface material which has additionally gained experience in more than ten centuries.
Highlights
INTRODUCTIONSeveral bricks with and without sliding joint have been tested under lateral loads with simulated dead load [15]
Pure friction seismic isolation systems mainly depend on the friction coefficient
Horasan mortar as a Pure Friction (P-F) sliding interface material is applied for a four-storey hospital building with Hollow brick filled asmolene flooring (HBFaf), for which mass [m], damping [c] and stiffness [k] matrices were constructed by finite element method [29] as presented in (Eqs. 3.1–3.3)
Summary
Several bricks with and without sliding joint have been tested under lateral loads with simulated dead load [15]. The static and dynamic frictional coefficients were assigned to 0.2 and both the accelerations and inter-storey drifts were reduced by 40–80% in the case of 4-or 11-degrees of freedom, which shows that the response reduction effect was more than expected under a significantly larger earthquake even when the friction coefficient was μ = 0.2. Nishimura et al [19] conducted another research on the results of two previous studies, where they investigated a metal-touched type base isolator, for which they assigned the experimental damping coefficient, static frictional coefficient and dynamic frictional coefficient as c = 0.096 - 0.153, μmax = 0.17 0.21, and μmin = 0.11 - 0.16, respectively, and used a simulation to evaluate the response reduction effect of a multi-degree-freedom system model.
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