Seismic Response of High-Rise Buildings Equipped with Base Isolation and Non-Traditional Tuned Mass Dampers

Naderpour, Hosein; Naji, Naghmeh; Burkacki, Daniel; Jankowski, Robert

doi:10.3390/app9061201

Cited by 41 publications

(24 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although these reductions might not be as pronounced as those for short-period structures, they are significant as compared to the improvements achieved in the responses of long-period structures using other well-adopted seismic protection systems. For example, tuned mass dampers with practical mass ratios (e.g., 1-5%) can provide reductions in the base shear and floor acceleration responses of high-rise buildings not greater than 20-30% (e.g., see Soto-Brito and Ruiz, 1999;Bekdas and Nigdeli, 2013;Anajafi and Medina, 2018;Naderpour et al, 2019). Furthermore, as shown in the present study, for FF excitations, the lateral-strength reduction caused by isolation systems can potentially even reduce the global displacement responses of the structures with relatively long non-isolated periods.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Anajafi

Poursadr²,

Roohi

et al. 2020

Front. Built Environ.

View full text Add to dashboard Cite

This study evaluates primarily the effectiveness of seismic isolation for structures with intermediate and relatively long non-isolated periods (e.g., bridges with tall piers) subjected to near-field (NF) and far-field (FF) excitations. The inelastic response spectrum approach is used to systematically evaluate the effects of the two fundamental aspects of seismic isolation, i.e., period lengthening and lateral-strength reduction on the seismic responses (e.g., displacement, acceleration, and base shear) of isolated structures. To validate the results, the real-world isolated Rudshur bridge with a relatively flexible (long-period) substructure is studied. Additional isolated and non-isolated variants of the Rudshur bridge with different initial periods are also developed. 20 FF (non-pulse) and 20 NF (pulse type) ground motions are used for the non-linear response history analyses. The results illustrate that when designed properly, seismic isolation can effectively reduce the mean base shear and acceleration responses of structures with relatively long non-isolated periods under FF excitations. For these structures, seismic isolation does not significantly increase the mean displacement responses under FF excitations, and for particular cases, can even reduce them. For NF excitations, seismic isolation can significantly reduce the mean base shear responses of intermediate-to long-period structures. In some cases, this reduction is even more significant than that for FF excitations. However, when the initial period of the isolated structure is relatively long (e.g., greater than 2.5 s), NF excitations can impose significantly large mean displacement demands on the superstructure (i.e., as great as 1.0 m for the studied cases). For NF excitations, a range of initial period (e.g., 1.5-2.5 s for the studied ground motions) and lateral yield-strength (e.g., 10-15% of the seismically effective weight) exists for the isolation system parameters that can noticeably reduce mean acceleration and base shear responses while mean displacement responses of the isolated superstructure remain within ranges used in practice. The inelasticspectrum approach, as used in this paper, can reasonably predict these isolation system parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Anajafi

Poursadr²,

Roohi

et al. 2020

Front. Built Environ.

View full text Add to dashboard Cite

show abstract

“…To solve this problem, many scholars have adopted the method of adding various dampers (e.g., viscous dampers, magnetorheological dampers, friction dampers, etc.) into the isolation layer of the structure to limit its displacement [21][22][23][24]. As a semi-active control, the input voltage of the magnetorheological (MR) fluid is calculated by the feedback of external excitation to change the viscous coefficient of the MR damper, which can approach the control effect of active control without a large amount of energy input [25][26][27][28][29][30][31][32][33], and it also performed well in the isolation layer [34][35][36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Semi-Active Control of Base Isolation System Using Magnetorheological Dampers for Concrete Frame Structure

Wei-qing

Zhang

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

The traditional passive base isolation is the most widely used method in the engineering practice for structural control, however, it has the shortcoming that the optimal control frequency band is significantly limited and narrow. For the seismic isolation system designed specifically for large earthquakes, the structural acceleration response may be enlarged under small earthquakes. If the design requirements under small earthquakes are satisfied, the deformation in the isolation layer may become too large to be accepted. Occasionally, it may be destroyed under large earthquakes. In the isolation control system combined with rubber bearing and magnetorheological (MR) damper, the MR damper can provide instantaneous variable damping force to effectively control the structural response at different input magnitudes. In this paper, the control effect of semi-active control and quasi-passive control for the isolation control system is verified by the shaking table test. In regard to semi-active control, the linear quadratic regulator (LQR) classical linear optimal control algorithm by continuous control and switch control strategies are used to control the structural vibration response. Numerical simulation analysis and shaking table test results indicate that isolation control system can effectively overcome the shortcoming due to narrow optimum control band of the passive isolation system, and thus to provide optimal control for different seismic excitations in a wider frequency range. It shows that, even under super large earthquakes, the structure still exhibits the ability to maintain overall stability performance.

show abstract

“…Vibrations of buildings may be induced by different types of dynamic excitations. The most common reasons of such vibrations are related to wind, earthquakes (see, for example, [1][2][3][4]), piling works, large mechanical vibrating entities, jumping of people or vibrations resulting from passing of vehicles and trains [5,6]. The last reason may lead to traffic-induced vibrations of geological structures generating negative effects, both for buildings and residents of buildings subjected to these dynamic excitations [7].…”

Section: Introductionmentioning

confidence: 99%

The Idea of Using Bayesian Networks in Forecasting Impact of Traffic-Induced Vibrations Transmitted through the Ground on Residential Buildings

2019

Self Cite

View full text Add to dashboard Cite

Traffic–induced vibrations may constitute a considerable load to buildings. In this paper, vibrations transmitted through the ground caused by wheeled vehicles are considered. This phenomenon may cause cracking of plaster, cracks in load-bearing elements or even, in extreme cases, collapse of the whole structure. Measurements of vibrations of real structures are costly and laborious. Therefore, the aim of the present paper is to propose a method of using Bayesian networks combined with implementation of geoscience for assessment of impact of traffic–induced vibrations on residential buildings. Firstly, the experimental tests were performed on different buildings using specialized equipment taking into account five factors: Distance from the building to the edge of the road, condition of road surface, condition of the building, the absorption of soil and the type of vehicle. Then, probabilistic analyses applying Bayesian networks were conducted and two methods of assessing the information value (EVSI method and entropy method) were compared. Finally, the developed diagnostic–decision support model was tested, so as to verify the most important parameter, affecting the possibility of structural vibrations to occur. The results of the study clearly showed that the use of Bayesian networks was a very effective approach to assess the impact of traffic-induced vibrations. The developed algorithm could be successfully applied both to existing and planned buildings, for which the source of vibration is already present or may appear in the future.

show abstract

Seismic Response of High-Rise Buildings Equipped with Base Isolation and Non-Traditional Tuned Mass Dampers

Cited by 41 publications

References 26 publications

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Experimental Investigation on Semi-Active Control of Base Isolation System Using Magnetorheological Dampers for Concrete Frame Structure

The Idea of Using Bayesian Networks in Forecasting Impact of Traffic-Induced Vibrations Transmitted through the Ground on Residential Buildings

Contact Info

Product

Resources

About