Aug 2026· Applied Sciences· Vol 16, pp. 7664· 0 citations· 35 references
Abstract
Viscoelastic dampers, leveraging the synergistic mechanism of viscous dissipation and elastic recovery, simultaneously reduce seismic-induced structural displacement and acceleration responses while offering the advantages of simple construction and ease of installation, which hold broad prospects in both the seismic design of new buildings and the retrofitting of existing structures. This work aims to propose a rapid optimization design method for viscoelastic dampers considering torsional effect for three-dimensional solid structures. First, a full-scale prefabricated assembled viscoelastic damper was developed, and mechanical property tests were conducted under a series of loading conditions. Based on the test results, a genetic algorithm is employed to optimize the design scheme of viscoelastic dampers through co-simulation using MATLAB R2022a and OpenSees. The optimization objectives consider both the inter-story drift ratio and acceleration response of the structure, with particular emphasis on the influence of torsional effects. Given that the proposed optimization scheme accounts for structural dynamic characteristics, building functionality, and the universality of seismic excitations, it serves as a design reference for the optimization analysis of other damped structures.
Earthquakes produce significant lateral forces on structures, which may lead to excessive displacement, structural
instability, and collapse if proper seismic resistant measures are not adopted. The present study focuses on the comparative
seismic performance evaluation of a G+11 reinforced cement concrete (RCC) building incorporated with different vibration
control system using ETABS 20. The building was analyzed for Seismic Zone V using the Response Spectrum Analysis (RSA)
method in accordance with the provisions of IS 1893 (Part 1): 2016. Six structural models were considered in the study, namely
bare frame structure, fluid viscous damper model, friction damper model, X-bracing model, shear wall model, and lead rubber
bearing (LRB) base isolated model. The seismic performance of each model was evaluated based on parameters such as
maximum storey displacement, storey drift and storey shear. The results obtained from the analysis indicate that the Shear Wall
model provides the most effective reduction in displacement and drift due to its Enhanced stiffness, although the shear wall and
bracing systems significantly improve structural stiffness but attract higher seismic forces hence greater base shear than bare
frame model. The fluid viscous damper and friction damper showed overall good seismic performance by reducing the overall
displacement, drift and storey shear without attracting higher seismic forces. The base isolated model increases the displacement
due to increased flexibility in the structure but reduces drift and force transmission into the structure. The study concludes that
vibration control systems considerably enhance the seismic performance of RCC structures and assist in improving structural
safety in earthquake-prone regions.
Utkarsh Mishra, Rakesh Grover· International Journal for Re...· 0 citations
This study investigates the three-dimensional seismic response of plan-irregular reinforced concrete (RC) frame structures subjected to near-fault pulse-like ground motions. The primary scientific contribution lies in evaluating how perimeter-distributed, short-stroke displacement-activated hysteretic dampers interact with complex structural torsional modes under the coupled influence of soil–structure interaction (SSI). Through unscaled nonlinear time–history analyses, this research exposes a critical vulnerability: foundation flexibility elongates the structural period, moving the system into close resonance with near-fault pulse content and more than doubling peak inter-storey drift demands. Concurrently, we demonstrate that the supplemental hysteretic system provides immediate elastic stiffness that successfully counteracts this SSI-induced period elongation, restricting peak drift amplifications to under 0.21% while actively mitigating torsional twisting. These findings provide a quantitative framework for the dual management of foundation flexibility and torsional irregularity using short-stroke metallic yielding devices.
Maria Eleni Diamantidou, P. Katsimpini, G. Papagiannopoulos et al.· GeoHazards· 0 citations
The adoption of a supplemental damping system in building structures dissipates a portion of the seismic input energy, thereby reducing the amount of energy dissipated through inelastic behaviour (hysteretic damping) within the structural elements. Viscoelastic Dampers (VEDs) are utilized to reduce post-earthquake damage and are employed in this study. However, since different VED layouts result in varying dynamic responses, a comparative study of the dynamic responses of structures with various VED layouts is conducted using nonlinear time history analysis (NLTHA). This research aims to compare inter-story drift and structural yielding by analysing the dissipated hysteretic energy and the amount of inelastic damping within the system elements of three building prototypes, each having a different VED horizontal distribution (layout configuration). A 30-story RC SMF is chosen as the seismic force-resisting system. The control variables are the number of VEDs per story and the location of the floors where the VEDs are installed. The results of the study show that a dense distribution of VEDs on the building facade (M1) provides the best performance, followed by a dense distribution in the building interior (M3), and a loose distribution on the facade with VEDs located at the corner bays (M2).
Rionathaniel M. P. N., Bondan Dhifan Mazaya, P. Sarli· IOP Conference Series: Earth...· 0 citations
Efficient and practical seismic control of structures-particularly through isolation systems-remains a significant challenge due to high implementation costs and construction complexity. Moreover, their application in retrofitting existing structures often requires extensive modifications.To address these challenges, this study proposes a novel and cost-effective seismic control system, termed the Ridge-Isolated Tuned Mass Damper (RITMD), which integrates the advantages of tuned mass damping and seismic isolation. A reduced-order two-degree-of-freedom (2DOF) model is developed to capture the coupled dynamic behavior of the primary structure and the RITMD system. An optimization framework based on the Particle Swarm Optimization (PSO) algorithm is employed to determine the optimal tuning parameters. Subsequently, closed-form design expressions are obtained using nonlinear regression analysis to facilitate practical engineering applications .The proposed approach is further extended to three-dimensional structural systems, and its performance is evaluated through nonlinear time-history analyses under bidirectional earthquake excitations. The results demonstrate that the RITMD system significantly reduces structural responses, including displacements, accelerations, inter-story drifts, torsional demands, and their corresponding root-mean-square (RMS) values.Overall, the proposed system provides an efficient, practical, and versatile solution for enhancing the seismic performance of both new and existing structures.
The present study evaluates the seismic performance of a G+15 reinforced concrete (RC) framed building using
ETABS software in accordance with IS 1893 (Part 1): 2016. The building is modelled as a plan-regular structure located
in Seismic Zone V with medium soil conditions. Modal Analysis, Equivalent Static Analysis, and Response Spectrum
Analysis are carried out to assess the dynamic behaviour of the structure under earthquake loading. Important structural
parameters such as natural time period, modal participation ratio, base shear, storey displacement, and storey drift are
obtained and analysed. The results indicate that seismic response varies significantly along the height of the building, with
maximum displacement and drift occurring at the upper storeys while remaining within the codal limits. The study
demonstrates that ETABS is an effective tool for evaluating the seismic behaviour of multi-storey RC buildings and
provides valuable information for designing safe and earthquake-resistant structures.
Moksha C K, Madhukaran· International Journal for Re...· 0 citations
Control systems such as base isolators and dampers are widely used to reduce the seismic energy input to structures. Among passive control devices, Tuned Liquid Dampers (TLDs) mitigate structural vibrations through sloshing of the contained liquid, which generates counteracting inertial forces without requiring external power. The effectiveness of TLD systems strongly depends on the selected mass ratio. This study evaluates the influence of TLD mass ratio on the seismic performance of a 10-story reinforced concrete frame building, with particular emphasis on plastic deformation demands and seismic-induced residual displacements. TLDs with different mass ratios are considered to assess their impact on interstory drift, column plastic rotations, and post-earthquake residual response. The results indicate that while increasing the mass ratio may lead to higher plastic deformation demands in certain cases, it consistently reduces residual displacements. Among the investigated configurations, a 5% mass ratio provides the most balanced performance, achieving significant reductions in residual displacement without substantial amplification of deformation demands. These findings highlight the importance of carefully tuning TLD mass ratio to achieve improved post-earthquake functionality while avoiding adverse increases in structural demand.
Birkan Dağ, Muzaffer Börekçi, M. Gençoğlu· Dicle Üniversitesi Mühendisl...· 0 citations
