Supplemental dampers in base-isolated buildings to mitigate large isolator displacement under earthquake excitations

Zelleke, Daniel H.; Elias, Said; Matsagar, Vasant; Jain, Arvind K.

doi:10.5459/bnzsee.48.2.100-117

Cited by 23 publications

(19 citation statements)

References 25 publications

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“…In addition, the stroke length of the nontraditional TMD is greatly reduced as compared with the traditional TMD during near‐fault long‐period earthquakes. Alternatively, Zelleke et al proposed supplemental dampers to effectively control the bearing displacement of the base‐isolated buildings subjected to near‐fault ground motions. However, Hessabi et al concluded that the effectiveness of the TMDs in base‐isolated structures with nonlinear base isolation systems is not as significant as for the linear base isolation systems.…”

Section: Introductionmentioning

confidence: 99%

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Stanikzai

Elias

Matsagar

et al. 2018

Structural Design Tall Build

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Summary Seismic response of a base‐isolated building equipped with single tuned mass damper (STMD), multiple tuned mass dampers (MTMDs), and distributed multiple tuned mass dampers (d‐MTMDs) under real earthquake ground motions is investigated. Numerical study is carried out using analytical models of five‐, 10‐, and 15‐storey base‐isolated buildings equipped with the STMD, MTMDs, and d‐MTMDs. The buildings are modeled as shear‐type structure with a lateral degree of freedom at each floor level, and the buildings are isolated using the laminated rubber bearing, lead‐core rubber bearing, friction pendulum system, and resilient‐friction base isolator. The coupled differential equation of motion for the buildings are derived and solved in the incremental form using Newmark's step‐by‐step method of integration. From the numerical study conducted, it is concluded that installing a tuned mass damper at each floor level of a base‐isolated building reduces the structural response in terms of top floor acceleration and bearing displacement. It is found that installing the MTMDs and d‐MTMDs are significantly beneficial in reducing top floor acceleration as compared with the STMD. Further, almost comparable reduction in the bearing displacement could be obtained by installing the STMD, MTMDs at top, and d‐MTMDs in the base‐isolated buildings. The d‐MTMDs are more beneficial as compared with the STMD and MTMDs as otherwise huge controller mass can now be divided and distributed on different floor levels.

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Section: Introductionmentioning

confidence: 99%

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Stanikzai

Elias

Matsagar

et al. 2018

Structural Design Tall Build

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“…The recorded peak response of the BI building with and without TMD schemes for the generated number of ground motions (N gen ) are then compared with the corresponding seismic demands. Thereafter, the probability of failure P f at any certain PGA level is defined as following (19) where N fail denotes the number of the cases which satisfies Equation (18). Then the process is reiterated for the range of the above-mentioned PGA levels, and the respective fragility curves are achieved assuming a lognormal distribution.…”

Section: Seismic Fragility Analysismentioning

confidence: 99%

“…As a consequence of added flexibility, displacement demand on the structure gets amplified, and additional damping is provided to keep displacement demand within acceptable limits. Zelleke et al [18] studied the effectiveness of viscous and visco-elastic dampers on seismic response control of BI buildings. They found that there is a tradeoff between the extent to which acceleration and displacement demand can be controlled by BI system combined with additional damping devices.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Mitigation of Base-Isolated Buildings

2020

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Earthquake response mitigation of a base-isolated (BI) building equipped with (i) a single tuned mass damper at the top of the building, (ii) multiple tuned mass dampers (MTMDs) at the top of the building, and (iii) MTMDs distributed on different floors of the building (d-MTMDs) is studied. The shear-type buildings are modeled by considering only one lateral degree of freedom (DOF) at the floor level. Numerical approach of Newmark’s integration is adopted for solving the coupled, governing differential equations of motion of 5- and 10-story BI buildings with and without TMD schemes. A set of 40 earthquake ground motions, scaled 80 times to get 3200 ground motions, is used to develop simplified fragility curves in terms of the isolator maximum displacement. Incremental dynamic analysis (IDA) is used to develop simplified fragility curves for the maximum target isolator displacement. It is found that TMDs are efficient in reducing the bearing displacement, top floor acceleration, and base shear of the BI buildings. In addition, it was noticed that TMDs are efficient in reducing the probability of failure of BI building. Further, it is found that the MTMDs placed at the top floor and d-MTMDs on different floors of BI buildings are more efficient in decreasing the probability of failure of the BI building when compared with STMD.

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“…The utilized isolation system is composed of elastomeric isolators with lead core inside. Their behavior has been simulated in the analysis by multi-linear non-elastic model (see [12,23]), which is defined by the following parameters: Effective stiffness (K eff ), effective damping (C eff ), initial stiffness (K 1 ), and yield force (f y ). The values of these parameters for the structural models of five-story and eight-story buildings are presented in Table 1.…”

Section: Numerical Modelsmentioning

confidence: 99%

“…The situation can be somewhat improved by the application of some methods of reduction of excessive displacements at the isolation level. Zelleke et al [23], for example, proposed to use the supplemental dampers in order to reduce the structural displacements without significant increase in the forces transferred to the superstructure. A structural vibration control system composed of rubber bearing with magnetorheological damper was considered by Fu et al [24].…”

Section: Introductionmentioning

confidence: 99%

Earthquake-Induced Pounding of Medium-to-High-Rise Base-Isolated Buildings

et al. 2019

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During earthquakes, out-of-phase vibrations in adjacent buildings with limited distance may cause pounding between them. In recent years, the use of seismic isolation has expanded considerably as an effective approach to reduce seismic damage. However, the isolated building experiences large displacements during earthquakes, and there is a possibility of collisions with adjacent structures. The research on earthquake-induced pounding of base-isolated buildings has been mainly focused on interactions between low structures. In this paper, the influence of structural pounding on the response of medium-to-high-rise base-isolated buildings is investigated under different ground motions. The analysis has been focused on collisions between two insufficiently separated five-story and eight-story base-isolated and fixed base buildings aligned in three different configurations. The results of the study indicate that structural pounding may significantly increase the response of medium-to-high-rise base-isolated buildings during earthquakes. Moreover, substantial dependence of the structural behavior on the gap size between structures has been observed. The general trend shows the reduction in the pounding-involved response with the increase in the gap size value. The results indicate that the increase in the response of the base-isolated building is larger when the height of the structure is bigger. They also show that larger amplifications of peak accelerations of the upper stories can be expected due to collisions. On the other hand, the amplifications of the story shears have not shown any specific trend for different stories of the analyzed base-isolated building.

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Supplemental dampers in base-isolated buildings to mitigate large isolator displacement under earthquake excitations

Cited by 23 publications

References 25 publications

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Seismic response control of base‐isolated buildings using multiple tuned mass dampers

Seismic Response Mitigation of Base-Isolated Buildings

Earthquake-Induced Pounding of Medium-to-High-Rise Base-Isolated Buildings

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