Current Trends in Fluid Viscous Dampers with Semi-Active and Adaptive Behavior

Applied Sciences, Journal Year: 2023, Volume and Issue: 13(18), P. 10358 - 10358

Published: Sept. 15, 2023

Fluid viscous dampers (FVDs) have shown their efficiency as energy-dissipating systems, reducing the effects induced on structures by dynamic loading conditions like earthquakes and winds. In this paper, evolution of technology is reviewed, with a focus current trends in development from passive to semi-active adaptive systems an emphasis advances adaptability control efficacy. The paper examines implementation FVDs such electrorheological, magnetorheological, variable stiffness, damping dampers. These devices high potential mitigate vibrations caused different intensities. addition, are presented. As devices, ones can adjust behavior according excitations’ intensity; however, they able do that autonomously without use any external equipment.

Language: Английский

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Cyclic test and numerical analysis of an innovative re-centering SMA cable-wrapped wedge friction damper

Soil Dynamics and Earthquake Engineering, Journal Year: 2025, Volume and Issue: 191, P. 109268 - 109268

Published: Feb. 5, 2025

Language: Английский

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Assessment of Non-Linear Analyses of RC Buildings Retrofitted with Hysteretic Dampers According to the Italian Building Code

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(7), P. 2684 - 2684

Published: March 22, 2024

While the use of steel hysteretic dampers has spread in last decade for both new and retrofitted constructions, Italian Building Code (IBC), as well Eurocode 8, does not provide specific recommendations design verification structures equipped with this technology. Due to their strong non-linear behavior, effectiveness these systems must be verified through analyses. Non-Linear Time-History analyses (NLTHAs) are most reliable method, but they computationally expensive. The aim study is investigate reliability static procedures, allowed by IBC an alternative NLTHAs, analysis buildings devices provided high damping capability. A parametric conducted on two reinforced concrete residential buildings, typical heritage, braces characterized different stiffness ductility values. retrofit using analyses, dynamic, considering either natural or artificial accelerograms, deems them equivalent. Within work, reference made only IBC; however, given significant similarity between European code, outcomes expected have a broader impact limited context. Therefore, although work preliminary study, it believed offer some initial insights topic serve foundation more in-depth that could lead regulatory revision subject.

Language: Английский

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Reliability analysis of two archetype RC buildings with hysteretic dampers

Soil Dynamics and Earthquake Engineering, Journal Year: 2023, Volume and Issue: 176, P. 108290 - 108290

Published: Oct. 19, 2023

The manuscript deals with a study on the performance/reliability analysis of steel hysteretic dampers designed for seismic retrofit RC frame structures at Basic Design Earthquake, BDE (characterized by 10 % probability being exceeded over reference lifespan, VR) higher hazard levels, represented Maximum Considered MCE, either 5 %/VR or 2.5 exceedance probabilities. Indeed, codes prescribe that anti-seismic devices to satisfy performance requirements must be able resist earthquakes intensity. Therefore, γ-factors amplifying design displacement force considered device capacity. objective consists in evaluating over-demand caused incorporated dissipative bracing systems when passing from two and comparing this values corresponding proposed current codes. Dampers various ductility factors are include majority devices. amplification recommended shown not suitable guaranteeing damper reliability; moreover, dependence reliability retrofitted upon damped braces is highlighted.

Language: Английский

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State-of-the-art review for lead extrusion dampers: development, improvement, characteristics, application areas, and research needs

Structures, Journal Year: 2023, Volume and Issue: 58, P. 105477 - 105477

Published: Nov. 3, 2023

Language: Английский

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RETROFITTING OF R.C. FRAME BUILDINGS WITH DOUBLE CON-CAVE CURVED SURFACE ISOLATOR SLIDERS CHARACTERIZED BY OVER-STROKE DISPLACEMENT CAPACITY

COMPDYN Proceedings, Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 1, 2023

Base isolation system is one of the most widespread passive control techniques currently used for seismic protection buildings and bridges.At ultimate limit state, isolating devices are designed to attain design displacement at Maximum Credible Earthquake (MCE), while superstructure remains in elastic range earthquake intensity corresponding Design Basis (DBE).Among various friction pendulum sliders elastomeric bearings economical practical system.Acceptable probabilities collapse seismically isolated frame structures could be achieved by a suitable isolator capacity.This study considers effects restraining rings over-stroke capacity double concave curved surface slider (DCCSS) isolators on structural response.The behaviour base six-storey reinforced concrete building case retrofitted site L'Aquila has been evaluated considering levels Collapse Limit State.Different configurations system, with end-stops placed maximum or extra-stroke capacity, have investigated.In this paper, results non-linear static dynamic analyses MCE compared.

Language: Английский

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Impact of Retrofitting Techniques on Seismic Resilience of Schools: Case Study in Khorramabad, Lorestan, Iran

Practice Periodical on Structural Design and Construction, Journal Year: 2024, Volume and Issue: 29(4)

Published: July 18, 2024

Language: Английский

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Experimental and Numerical Study on Hysteretic Behavior of Frictional Energy Dissipation Steel Truss

Materials, Journal Year: 2023, Volume and Issue: 16(18), P. 6273 - 6273

Published: Sept. 19, 2023

In this study, the hysteretic behavior of a novel frictional energy dissipation steel truss (FED-ST) is examined. The proposed FED-ST incorporates friction damper with brass as material into top chord traditional to improve seismic performance staggered framing systems. A specimen scale 1:2.5 was subjected hysteresis test. behavior, ductility, and capability were analyzed considering test findings. It demonstrated that has favorable ductility an capacity 7.3 times more than conventional specimen. findings then used compare validate finite element (FE) model. FE analysis results are in strong agreement results, demonstrating validity modeling approach. To further investigate impact cover plate width on FED-ST, preliminary parametric research also carried out.

Language: Английский

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Research on the Mechanical Model and Hysteresis Performance of a New Mild Steel-Rotational Friction Hybrid Self-Centering Damper

Materials, Journal Year: 2023, Volume and Issue: 16(22), P. 7168 - 7168

Published: Nov. 15, 2023

A mild steel-friction self-centering damper with a hybrid energy-dissipation mechanism (MS-SCFD) was proposed, which consisted of steel, frictional, dual-energy-dissipation system and disc spring resetting system. The structure principle the MS-SCFD were explained in detail while restoring force model established. hysteretic behavior under low-cycle reciprocating loading modeled. Then, influence parameters such as preload, friction coefficient, soft-steel thickness on mechanical properties investigated. results indicate that simulation are basically consistent theoretical prediction results, maximum error only 9.46% for key points bearing capacity. Since is provided curve typical flag type, it will obtain capacity excellent performance. It can effectively enhance stiffness, capacity, capability after pre-pressure increased. increases increase coefficient. However, also residual deformation MS-SCFD. energy dissipation particularly sensitive to steel. After being loaded, all components not damaged except plastic caused by yielding normal function be restored simply replacing steel plates earthquake. Therefore, significantly economy applicability damper.

Language: Английский

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Reliability Analysis of Two Archetype Rc Buildings with Hysteretic Dampers

Published: Jan. 1, 2023

Current Seismic Codes prescribe that anti-seismic devices designed to satisfy the performance requirements at ultimate limit state must be able resist earthquakes of higher intensity, corresponding non-collapse state. Therefore, γ-factors amplifying design displacement or force taken into account for devices.This work is a preliminary study on reliability RC structures retrofitted with hysteretic dampers return period 475 years in accordance Italian Building Code. Dampers various ductility factors are considered contemplate majority today market. The response investigated through non-linear dynamic analyses performed considering seismic events periods 975 and 1950 respectively.The results show amplification recommended codes suitable guaranteeing damper reliability; moreover, dependence upon damped braces highlighted.

Language: Английский

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