The Effect of Irregularity of Lateral Stiffness in Estimating the Separation Gap of Adjacent Frames

The construction demand for irregular structures is increasing due to the population growth of cities, limited construction areas, and the aesthetics of structures. Lack of proper understanding on the dynamic behavior of these structures during seismic events can lead to local and global failures on them. In order to investigate this issue, we used a regular 10-story structure with three different stiffness irregularity cases along the elevation. Irregularities are considered in three positions: the lower half of the structure height, the lowest story, and the middle story. In this study, to reduce the damage and mitigate the seismic response of the structure, three control systems are proposed including a magnetorheological (MR) damper with semiactive fuzzy controller as the semiactive control system, a Tuned Mass Damper (TMD) as the passive control system, and the simultaneous use of them. Based on the numerical analyses under near- and far-field ground motions, the residual plastic deformations are significantly reduced by the simultaneous use of MR damper and TMD, while each of these dampers alone performs poorly in some cases. The results show that if these two dampers are used together, a more promising control system with robust performance against changes in system parameters can be achieved.

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“…e numerical simulations showed that the structural response is significantly affected by the irregularity [7].…”

Section: Introductionmentioning

confidence: 99%

Study on Passive and Semiactive Control Systems in Structures under Near- and Far-Field Earthquakes

Zamanian

Kheyroddin

Mortezaei

2022

Shock and Vibration

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“…Pounding, which could occur due to an insufficient seismic gap, is an issue that needs to be examined in terms of structural dynamics and earthquake engineering. For this purpose, there are several numerical but limited experimental studies in the literature on subjects such as the pounding force between two adjacent structures, the number of pounding, the moment of collision, and the determination and investigation of the size of the seismic gap [3][4][5][6][7][8]10].…”

Section: Introductionmentioning

confidence: 99%

“…In order to determine seismic gaps under seismic effects, besides the pounding models used in numerical analysis, studies on the effects of gaps between adjacent buildings, taking into account different parameters, were carried out by Saxena et al [6]. In addition, Khatami et al [7,8], in their studies, investigated the effect of seismic gaps in the presence of lateral stiffness irregularity, soft stories, and regular and irregular adjacent structures using an experimental model of Takabatake et al [9], which had two frames with single span and four-story. In another study, the adjacent buildings were modeled as multidegree systems consisting of lumped masses, and the pounding was simulated using five different earthquake motions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Pounding between Two Adjacent Building Models with Experimental Methods

Şekerci

Damcı

2023

Turkish Journal of Civil Engineering

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This study investigates the pounding phenomenon by shaking table experiments on two scaled building models. Representing the situation where the seismic gap is insufficient, two building models are adjacently positioned on the shaking table, and pounding was investigated for harmonic and strong ground motion excitations. Displacement and acceleration responses were obtained to observe the pounding effect experimentally from video and accelerometer recordings, respectively. The Kelvin-Voigt Model consisting of spring and damper was used for numerical pounding analysis. The most critical parameters of the Kelvin–Voigt model, which are the spring stiffness (ks) and the damping, are calculated according to the coefficient of restitution (r) and were investigated and compared with harmonic experimental results. The obtained parameters, compatible with the harmonic experiments, were used to examine structural behavior under earthquake effect for the case where the building models are positioned for an insufficient seismic gap. For comparison, numerous numerical simulations were realized using different spring stiffnesses and coefficients of restitution. The study shows that when the coefficient of restitution is taken as 0.2 or 0.4, and the ratio of spring stiffness to shear stiffness (ks/k) is 1 or 5, reasonable results in numerical earthquake simulations can be obtained.

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Nonlinear Vibration Control of Adjacent Steel MRF Structures Using Non-velocity Dependent Dampers Subjected to Various Seismic Excitations

et al. 2022

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The Effect of Irregularity of Lateral Stiffness in Estimating the Separation Gap of Adjacent Frames

Cited by 3 publications

References 15 publications

Study on Passive and Semiactive Control Systems in Structures under Near- and Far-Field Earthquakes

Study on Passive and Semiactive Control Systems in Structures under Near- and Far-Field Earthquakes

Investigation of Pounding between Two Adjacent Building Models with Experimental Methods

Nonlinear Vibration Control of Adjacent Steel MRF Structures Using Non-velocity Dependent Dampers Subjected to Various Seismic Excitations

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