Limit states and failure mechanisms of viscous dampers and the implications for large earthquakes

Miyamoto, Hiroyuki; Gilani, Amir S. J.; Wada, Akira; Ariyaratana, Christopher

doi:10.1002/eqe.993

Cited by 58 publications

(44 citation statements)

References 3 publications

(1 reference statement)

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“…see [35] for fluid viscous dampers); however, this would require internal details of the devices that are only known to the manufacturer. In this study, this stiffness was assumed to have a large value equal to 1000 times the value of stiffness K 0 .…”

Section: Fluidic Self-centering Device and Connecting Bracementioning

confidence: 99%

Probabilistic collapse resistance and residual drift assessment of buildings with fluidic self‐centering systems

Kitayama

Constantinou

2016

Earthq Engng Struct Dyn

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SUMMARYThe seismic performance of three-and six-story buildings with fluidic self-centering system is probabilistically assessed. The fluidic self-centering systems consist of devices that are based on the technology of fluid viscous dampers but built in a way that pressurization of the devices results in preload that is explored to reduce or eliminate residual drift. The design of these buildings followed a procedure that parallels the design for structures with damping systems in ASCE 7 but modified to include the preload effect. Reference conventional buildings were also designed per ASCE 7 for comparison. These buildings were then analyzed to examine and compare their seismic collapse resistance and residual drift, where the residual drift limits of 0.2, 0.5, 1.0 and 2.0% of story height were selected as important thresholds. The study further calculated the mean annual frequency of collapse and corresponding exceedance probability over 50 years, and the mean annual frequency of exceeding the threshold residual story drift limits and the corresponding exceedance probability over 50 years. Variations in the design procedures by considering increased displacement capacity or damping or preload of the devices, different types of damping, increased ultimate strength of the selfcentering device-brace systems and increased frame strength were considered. It was found that increasing either the ultimate force capacity of the self-centering device-brace system or the frame strength results in important improvements in the collapse resistance and in minimizing residual drift, whereas the variation of other design parameters has minor effects.

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Section: Fluidic Self-centering Device and Connecting Bracementioning

confidence: 99%

Probabilistic collapse resistance and residual drift assessment of buildings with fluidic self‐centering systems

Kitayama

Constantinou

2016

Earthq Engng Struct Dyn

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“…The damper limit states, which occur when the piston reaches its stroke limit during earthquake response, are not considered. Damper limit states should be considered in the assessment of the collapse resistance of frames equipped with viscous dampers having limited stroke [29]. Typical stroke limits in the dampers available in the market ranges from ±80 to ±130mm and strokes can be extensible up to ±900mm upon request [30].…”

Section: Models For Nonlinear Dynamic Analysis and Earthquake Ground mentioning

confidence: 99%

Assessment of capacity design of columns in steel moment resisting frames with viscous dampers

Karavasilis

2016

Soil Dynamics and Earthquake Engineering

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Previous research showed that steel moment-resisting frames (MRFs) with viscous dampers may experience column plastic hinges under strong earthquakes and highlighted the need to further assess the efficiency of capacity design rules. To partially address this need, three alternatives of a prototype building having five, 10 and 20 stories are designed according to Eurocode 8 using either steel MRFs or steel MRFs with dampers. Incremental dynamic analysis (IDA) is conducted for all MRFs and their collapse resistance and plastic mechanism is evaluated. The results show that steel MRFs with dampers are prone to column plastic hinging in comparison to steel MRFs. The steel MRFs with dampers are then iteratively re-designed with stricter capacity design rules to achieve a plastic mechanism that is approximately similar to that of steel MRFs. The performance of these re-designed steel MRFs with dampers indicates, that overall, enforcement of stricter capacity design rules for columns is not justified neither from a collapse resistance or a reparability perspective.

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“…A mathematical representation of FVDs incorporating the damper limit states has been developed by the authors (Miyamoto et al ., 2009a) and was used for the studies (see Figure 1). This model consists of the driver brace, piston, piston undercut, viscous component and cylinder walls.…”

Section: Mathematical Model Of Viscous Dampers With Limit Statesmentioning

confidence: 99%

Collapse risk of tall steel moment frame buildings with viscous dampers subjected to large earthquakes

Miyamoto

Gilani

Wada

et al. 2010

Structural Design Tall Build

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The design approach for tall steel moment frame structures with viscous dampers entails sizing steel members per code‐level strength forces, and sizing viscous dampers to limit storey drifts. This method has been used extensively in new and retrofit applications. This methodology has resulted in structures that have longer periods than those using the code‐designed approach, are economically competitive and have excellent performance in design‐level earthquakes. However, the efficacy of this design in extreme events is not well understood because of the lack of limit states data for dampers and the absence of a field or analytical database of such structures subjected to large earthquakes. Mathematical modelling of viscous dampers with limit states was developed, correlated with experimental results and then used to analyse 10‐storey archetypes. This analysis showed that the design had satisfactory performance during extreme seismic events. There were significant improvements in reducing collapse hazard by using an enhanced damper design with an increased damper safety factor. Copyright © 2010 John Wiley & Sons, Ltd.

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Limit states and failure mechanisms of viscous dampers and the implications for large earthquakes

Cited by 58 publications

References 3 publications

Probabilistic collapse resistance and residual drift assessment of buildings with fluidic self‐centering systems

Probabilistic collapse resistance and residual drift assessment of buildings with fluidic self‐centering systems

Assessment of capacity design of columns in steel moment resisting frames with viscous dampers

Collapse risk of tall steel moment frame buildings with viscous dampers subjected to large earthquakes

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