A novel semi-active damping device termed Variable Friction Cladding Connection (VFCC) has been previously proposed to leverage cladding systems for the mitigation of natural and man-made hazards. The VFCC is a semi-active friction damper that connects cladding elements to the structural system. The friction force is generated by sliding plates and varied using an actuator through a system of adjustable toggles. The dynamics of the device has been previously characterized in a laboratory environment. In this paper, the performance of the VFCC at mitigating non-simultaneous multi-hazard excitations that includes wind and seismic loads is investigated on a simulated benchmark building. Simulations consider the robustness with respect to some uncertainties, including the wear of the friction surfaces and sensor failure. The performance of the VFCC is compared against other connection strategies including traditional stiffness, passive viscous, and passive friction elements. Results show that the VFCC is robust and capable of outperforming passive systems for the mitigation of multiple hazards.
KEYWORDS: Control systems, Probability theory, Numerical simulations, Buildings, Systems modeling, Magnesium, Hazard analysis, Magnetic resonance imaging, Computer simulations, Seaborgium, Turbulence
High performance control systems (HPCS) are advanced damping systems capable of high damping performance over a
wide frequency bandwidth, ideal for mitigation of multi-hazards. They include active, semi-active, and hybrid damping
systems. However, HPCS are more expensive than typical passive mitigation systems, rely on power and hardware (e.g.,
sensors, actuators) to operate, and require maintenance. In this paper, a life cycle cost analysis (LCA) approach is proposed
to estimate the economic benefit these systems over the entire life of the structure. The novelty resides in the life cycle
cost analysis in the performance based design (PBD) tailored to multi-level wind hazards. This yields a probabilistic
performance-based design approach for HPCS. Numerical simulations are conducted on a building located in Boston,
MA. LCA are conducted for passive control systems and HPCS, and the concept of controller robustness is demonstrated.
Results highlight the promise of the proposed performance-based design procedure.
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