scholarly journals Seismic Performance of the Inerter and Negative Stiffness–Based Dampers for Vibration Control of Structures

2021 ◽  
Vol 7 ◽  
Author(s):  
Naqeeb Ul Islam ◽  
R. S. Jangid
Keyword(s):  
Energy Dissipation ◽  
Mathematical Formulation ◽  
Negative Stiffness ◽  
Optimization Approach ◽  
Comparative Performance ◽  
Viscoelastic Dampers ◽  
Passive Energy Dissipation ◽  
Recent Developments ◽  
Energy Dissipation Devices ◽  
Shear Building

Passive energy dissipation devices or supplemental damping devices have been successfully implemented into structures for controlling the excessive vibrations under wind and seismic excitation. Recent developments in the form of negative stiffness dampers (NSDs) and inerter-based vibration absorbers (IVAs) as potential energy dissipation devices are of considerable interest to researchers. The present study evaluates the performance of the combined NSD and IVA as a possible alternative to the traditional energy dissipation devices such as viscous dampers (VDs) and viscoelastic dampers (VEDs). The mathematical formulation and optimal design of the combined NSD and IVA mechanism are presented. A 20-storey benchmark building is modeled as a multi-degree-of-freedom (MDOF) shear building. The dynamic equations for the MDOF building are written in the state-space form, and a simple optimization approach based on effective modal damping is prescribed. Comparative performance between traditionally applied and novel IVA and NSD is investigated. The design considerations to analyze structures employing combined NSDs and IVAs are developed. It is demonstrated that NSDs and IVA-based passive energy dissipation devices are the most efficient devices in reducing inter-storey drifts and floor accelerations compared with VDs and VEDs using the same damping coefficient.

scholarly journals Dynamic Properties and Energy Dissipation Study of Sandwich Viscoelastic Damper Considering Temperature Influence

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 470
Author(s):  
Yeshou Xu ◽  
Zhaodong Xu ◽  
Yingqing Guo ◽  
Xinghuai Huang ◽  
Yaorong Dong ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Dynamic Properties ◽  
Excitation Frequency ◽  
Viscoelastic Damper ◽  
Kelvin Model ◽  
Viscoelastic Dampers ◽  
Self Heating ◽  
Passive Energy Dissipation ◽  
Sandwich Type ◽  
Environmental Temperatures

Viscoelastic dampers are a kind of classical passive energy dissipation and vibration control devices which are widely utilized in engineering fields. The mechanical properties and energy dissipation capacity of the viscoelastic damper are significantly affected by ambient temperature. In this work, dynamic properties tests of the sandwich type viscoelastic damper at different environmental temperatures are carried out. The equivalent fractional Kelvin model which can characterize the mechanical behavior of the viscoelastic damper with varying frequencies and temperatures is introduced to describe the dynamic properties and energy dissipation capability of the sandwich viscoelastic damper. The self-heating phenomenon of the sandwich viscoelastic damper is studied with a numerical simulation, and the dynamic properties and energy dissipation variation of the viscoelastic damper with self-heating processes are also analyzed. The results show that the dynamic properties of the viscoelastic damper are significantly affected by temperature, excitation frequency and the internal self-generated heating.

Viscous Dampers Utilized at an Operating Electronic Facility for Reducing Seismic Risk

2014 ◽  
Vol 1021 ◽  
pp. 128-139
Author(s):  
Heng Sheng Chang ◽  
Ji Ping Ge
Keyword(s):  
Energy Dissipation ◽  
Seismic Activity ◽  
Seismic Risk ◽  
Semiconductor Manufacturing ◽  
Damping Ratio ◽  
Viscous Damper ◽  
Fundamental Vibration ◽  
Passive Energy Dissipation ◽  
Energy Dissipation Devices

Using supplemental energy dissipation devices into the structure to increase the damping ratio for reducing the responses of seismic activity has become more and more popular. This paper presents a case study of seismic retrofit strategy, utilizing a type of passive energy dissipation device, namely, the viscous damper, in order to make an ongoing chips produced facility resistant to seismic activity. The building in question was a chips produced facility belonging to a semiconductor manufacturing company. This was a double FAB where the structure system was divided into an island building and an RC shell. The retrofit involved installing 44 non-linear dampers between the island building and the RC shell. This was due to the significant differences in the fundamental vibration periods. This paper will present the rationale of making a decision on the parameters of the dampers to give the optimum retrofit strategy.

Simplified Method for Pushover Curves of Asymmetric Structure with Displacement-Dependent Passive Energy Dissipation Devices

2007 ◽  
Vol 10 (5) ◽  
pp. 537-549 ◽  
Author(s):  
Hong-Nan Li ◽  
Gang Li
Keyword(s):  
Energy Dissipation ◽  
Analytical Method ◽  
Numerical Results ◽  
Asymmetric Structure ◽  
Engineering Analysis ◽  
Passive Energy Dissipation ◽  
Symmetric Structure ◽  
Simplified Method ◽  
Pushover Curve ◽  
Energy Dissipation Devices

This paper presents a simplified method to calculate pushover curves for an asymmetric structure with displacement-dependent passive energy dissipation devices (DDPEDDs). The deformations of a symmetric structure are analyzed in translation and torsion, respectively. These results are then combined in order to calculate the pushover curve for an asymmetric structure with DDPEDDs. The numerical results obtained by using the simplified analytical method are then compared to those obtained from the analysis of the models using the software SAP2000. The results show that the simplified analytical method can be an effective tool for engineering analysis of an asymmetric structure.

New installation scheme for viscoelastic dampers using cables

2010 ◽  
Vol 37 (9) ◽  
pp. 1201-1211 ◽  
Author(s):  
Hyunhoon Choi ◽  
Jinkoo Kim
Keyword(s):  
Nonlinear Dynamic Analysis ◽  
Relative Displacement ◽  
Damping Force ◽  
Viscoelastic Dampers ◽  
Passive Energy Dissipation ◽  
Passive Dampers ◽  
Energy Dissipation Devices ◽  
Configuration Scheme ◽  
Model Structures ◽  
Installation Cost

Passive energy dissipation devices, such as, viscous, viscoelastic, and friction devices are generally installed in buildings using diagonal or chevron braces. To increase the effective damping force and to reduce the damper volume, various magnifying system of the damper displacement, such as, toggle brace system and scissor-jack-damper configuration have been developed with increase in installation cost. In this study, new installation scheme for passive dampers was proposed using cables installed in such a way that relative displacement equal to storey displacement occurs between the cable and the structure when the structure is subjected to lateral load. The cables can be installed continuously or discretely between base and top storey of the structure. To verify the validity of the proposed method nonlinear dynamic analysis of model structures with viscoelastic dampers installed using the proposed configuration scheme was carried out using three earthquake records and two sinusoidal forces. According to the analysis, the proposed method resulted in significant reduction in the size of dampers compared with the conventional installation methods.

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