Combined Use of Rocking Walls and Inerters to Improve the Seismic Response of Frame Structures

Egidio, Angelo Di; Pagliaro, Stefano; Fabrizio, Cristiano

doi:10.1061/(asce)em.1943-7889.0001920

Cited by 16 publications

(9 citation statements)

References 47 publications

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“…Moreover, an alternative approach to virtually increase the mass involves attaching inerter devices to wall. 28,44 However, further studies are needed to examine the behavior of structures coupled with tuned walls incorporating inerters. Table 3 summarizes the maximum and RMS reduction ratios for the displacement and acceleration that are gained when using the TSCW system for the TA B L E 3 Vibration reduction effects on the displacement and the acceleration of the oscillator in TSCW system.…”

Section: Performance Of the Analyzed Systems Without Prestressingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The results demonstrated that incorporating rocking rigid blocks can improve the seismic response, and the block demonstrated the ability to function as a TMD. In addition, Di Egidio et al 28 extended their work by adding inerter devices to the rocking wall to provide some apparent inertia forces. The results demonstrate that the presence of inserters improves the coupling effectiveness with the block, thereby permitting the use of smaller blocks.…”

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confidence: 99%

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Seismic response analysis of single‐degree‐of‐freedom structure coupled with tuned self‐centering wall

Wu,

Ogail,

2024

Earthq Engng Struct Dyn

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This paper investigates the possibility of using self‐centering walls (SCWs) as tuned mass dampers (TMDs) to control the seismic response of structures. The basic characteristics of this system are investigated using a two‐degree‐of‐freedom (2‐DOF) model, representing the main structure as a single‐degree‐of‐freedom (SDOF) oscillator interconnected with an SCW through viscous and elastic devices. The nonlinear equations of motion for the proposed coupled system are derived and then utilized to determine the displacement amplification response. The coupling parameters are optimized to minimize the dynamic response of the oscillator using a numerical method. A simulation study is conducted to investigate the response of the proposed system by considering six recorded earthquakes. Several parameters are studied, including the mass ratio, the influence of prestressing, and the slenderness angle of the wall. The displacement spectra are generated using the optimized parameters and compared to those of the uncoupled system and the traditional coupled system, which features a rigid connection between the structure and the wall. The results reveal that the proposed system effectively suppresses both maximum and root mean square responses of structures, outperforming the traditional coupled system in most cases. Improved performance for the proposed system can be achieved by increasing the wall's mass ratio and decreasing the slenderness angle. Moreover, prestressing has an adverse impact on the system's displacement response. Finally, the influence of wall flexibility is examined using a finite element model, revealing a minimal effect on the system's response.

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Section: Performance Of the Analyzed Systems Without Prestressingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Seismic response analysis of single‐degree‐of‐freedom structure coupled with tuned self‐centering wall

Wu,

Ogail,

2024

Earthq Engng Struct Dyn

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“…Moreover, in [7,8], the behavior of a structure placed on a rocking podium is investigated using low-dimensional models. Additionally, in [9][10][11][12], archetype models were used to analyze the seismic performances of coupling a frame structure with an external rocking wall. More recently, the effectiveness of coupling a frame structure with external systems equipped with inerter devices and a yielding exoskeleton was studied in [13,14], respectively.…”

Section: Introductionmentioning

confidence: 99%

Seismic Benefits from Coupling Frame Structures with a Hysteretic Mass Damper Inerter

Egidio

Contento

2023

Applied Sciences

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The coupling of frame structures with external oscillating bodies, such as rigid walls, dynamic mass absorbers, elastoplastic dampers, or tuned mass dampers, can be effective in reducing the displacements of the structure and protecting it against seismic loads. This paper proposes connecting an external oscillating body to the first story of a frame structure and studying the effectiveness of the coupling by evaluating the reduction in the displacements of the frame structure. The inertial effects of the oscillating body are increased by introducing a virtual mass, provided by an inerter device. The oscillating body, characterized by physical and virtual masses, is connected to the frame structure through a hysteretic device. The study is performed on a dynamically equivalent three-degree-of-freedom (3-DOF) model, whose equations are written using a direct approach. To verify the effectiveness of the protection device, named hysteretic mass damper inerter (HMDI), in reducing the displacements of the frame structure, the displacement of the first story and the drifts of the upper stories are compared to those of the frame structure not connected to the external oscillating body. An initial spectral analysis, performed on the linearized mechanical system, clarifies the role of the parameters of the external device in the dynamic behavior of the coupled system. An additional seismic analysis is performed by using three single earthquake records first, and then a set of seven additional earthquake records selected to be compatible with the design spectrum of Los Angeles. Specific spectral gain maps are used to organize the results of an extensive parametric analysis. They show that the HMDI reduces both displacements and drifts of the structure in large ranges of the parameters that characterize the HMDI. It is found that the proposed protection method is particularly effective for low- and medium-rise frame structures.

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“…Several authors used mass-dampers that have been modeled either in the shape of a pendulum [8,9,10,11] or as a single degree of freedom mass running on the top of the rigid block [12,13,14]. Some papers presented the coupling of rigid bodies with inerter devices [15,16]. Lately, some researchers studied the use of semi-active anchorages [17,18], and active control techniques [19,20,21] to increase the amplitude of base excitation required to topple a rigid block.…”

Section: Introductionmentioning

confidence: 99%

Base Versus Top Active Control to Improve Dynamic and Seismic Performances of Rigid Blocks

Egidio¹,

Contento²,

Pagliaro³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Combined Use of Rocking Walls and Inerters to Improve the Seismic Response of Frame Structures

Cited by 16 publications

References 47 publications

Seismic response analysis of single‐degree‐of‐freedom structure coupled with tuned self‐centering wall

Seismic response analysis of single‐degree‐of‐freedom structure coupled with tuned self‐centering wall

Seismic Benefits from Coupling Frame Structures with a Hysteretic Mass Damper Inerter

Base Versus Top Active Control to Improve Dynamic and Seismic Performances of Rigid Blocks

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