A method of calculating the non‐linear seismic response of a building braced with viscoelastic dampers

Summary Most past researches relevant to viscoelastic (VE) dampers, regardless of analytical and experimental ones, aimed at their design (or pre‐damage) performance. In reality, however, under maximum considered or greater shaking caused by earthquakes, the shear deformation of the VE dampers installed in a structure may exceed or is even much larger than their nominal design range, thus leading to damage to the VE material. Under this circumstance, the structural design might become not conservative when the viscoelastically damped structure is a retrofit design or is not a supplemental damping design. Therefore, in this study, the beyond design and residual performances of the full‐scale VE dampers after suffering damage are experimentally probed and compared with their design (or pre‐damage) performance tested before. To have more engineering sense in practice, some suitable and conservative empirical post‐damage models through considering reduction factors in the Kelvin‐Voigt model for assessing the beyond design and residual performances of the full‐scale VE dampers after suffering damage are recommended.

Section: Introductionmentioning

confidence: 99%

Experimental beyond design and residual performances of full‐scale viscoelastic dampers and their empirical modeling

Wang

Chiu

et al. 2019

“…In the first case they allow the supports to deform with a large dissipation and re-centering capacity [1]. In the second case they improve the stiffness and dissipation capacity of frame structures (new or existing) when utilized in dissipating braces [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic systems with high damping rubber: Nonlinear behaviour and linear approximation

Dall’Asta

Ragni

2008

SUMMARYHigh damping rubber (HDR) shows a quite complex constitutive behaviour, which is nonlinear with respect to strain and is dependent on the strain rate. In addition, it exhibits a transient response during which the material properties change (scragging or more generally the Mullins effect). A number of recent works were dedicated to analysing and modelling material behaviour. This paper studies the nonlinear dynamics of systems with restoring force produced by HDR-based devices in order to propose a procedure to define equivalent linear models considering both transient and stationary behaviours. The reliability of these linear models is tested by evaluating the upper and lower bounds of the seismic response of a structural system equipped with HDR-based devices (structural system with dissipative bracings and isolated systems).

HDR devices for the seismic protection of frame structures: Experimental results and numerical simulations

Ragni

Dezi

Dall’Asta

et al. 2009

SUMMARYAs part of a national research programme an experimental campaign was carried out on a real scale mock-up consisting of a steel-concrete composite frame equipped with dissipative bracings, based on high damping rubber (HDR) devices. Free vibration tests, followed by force-controlled and displacementcontrolled cyclic tests were performed. The experimental tests were aimed at studying the dynamic response of the coupled system in order to demonstrate the effectiveness of HDR devices in increasing the stiffness and dissipation capacity of the frame and investigating the ability of the constitutive HDR model proposed by the authors to predict the dynamic response of the coupled system.