Experimental and numerical investigation of lead-rubber dampers in chevron concentrically braced frames

Zeynali, Keyvan; Monir, Habib Saeed; Mirzai, Nadia M.; Hu, Jong Wan

doi:10.1016/j.acme.2017.06.004

Cited by 26 publications

(10 citation statements)

References 18 publications

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“…Eccentrically braced frames (EBFs) can be detailed to provide ductile behavior under a severe earthquake [21][22][23][24][25][26]. To investigate the seismic behavior of the multi-story system with conventional fuses and butterfly-shaped dampers, the prototype example from SEAOC [18] is considered, based on which, the OpenSees software is used, subsequently, for incremental dynamic analysis.…”

Section: Design and Verification Of The Modeling Methodologymentioning

confidence: 99%

Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

2019

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Structural strength and stiffness were previously investigated to sufficiently improve the lateral load resistance against major events. Many buildings require appropriate design to effectively withstand the lateral seismic loads and reduce the corresponding damages. Design methodologies and structural elements were recently introduced to improve the energy dissipation capability and limit the high force demands under seismic loadings. The new systems are designed to protect the structural integrity and concentrate the inelasticity in a specific area, while the remaining parts are kept undamaged and intact. This study introduces a new structural system with dampers having strategic cutouts, leaving butterfly-shaped shear dampers for dominating the yielding mechanism over other brittle limit states. The new system is designed for re-establishing the conventional eccentrically braced frame system with simple linking beams. The system with strategic cutouts is subsequently used and compared with the eccentrically braced frames (EBF) system for seismic performance investigation and incremental dynamic analysis (IDA), using the OpenSees program, which is used to indicate the collapse behavior under forty-four selected ground motions. Results show that the butterfly-shaped multi-story buildings, compared to the corresponding conventional systems, are capable of enhancing the system resistance against lateral seismic loads by postponing the collapse state to the larger drift ratio values.

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Section: Design and Verification Of The Modeling Methodologymentioning

confidence: 99%

Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

2019

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“…Because the effect of the FVD is mainly related to the velocity, it shows that the FVD can still achieve good damping effect when they are used together. 15,16…”

Section: Effect Analysis Of Fvd Seismic Isolationmentioning

confidence: 99%

Study on the damping efficiency of continuous beam bridge with constant cross-section applied by lead rubber bearings and fluid viscous dampers

Leihua

et al. 2020

Noise & Vibration Worldwide

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Bridges are the lifelines of disasters in earthquake areas. Therefore, it is very necessary to ensure the safety and traffic function after earthquake. Seismic isolation refers to install external energy dissipation devices or external energy input devices in specific parts of engineering structures. There are certain differences in longitudinal and transverse seismic responses of multi-span continuous beam bridges by changing the seismic dynamic characteristics or dynamic effects of structures. It is difficult to achieve the purpose of seismic isolation in both horizontal directions using isolation devices alone. The rubber deformation ability of lead rubber bearings can effectively insulate, and the yield energy consumption ability of its lead core can effectively consume the seismic energy for damping. The horizontal resistance is very small under the creep load, and the stiffness decreases rapidly after yielding under the strong dynamic earthquake load; meanwhile, the seismic energy is dissipated by the hysteresis of bearing. Fluid viscous damper is a velocity-dependent energy dissipation device, which produces viscous damping force, provides strong restoring force for components, and has a good limit function. This process will also dissipate the seismic energy, so as to reduce the structural earthquake response. Using these two methods together, the horizontal seismic responses of multi-span continuous beam bridges can be effectively controlled at the same time. Based on this idea, this article takes a high-speed multi-span continuous beam bridge with equal section as the engineering background, and uses dynamic time history analysis method to discuss the seismic isolation effect of lead rubber bearings and fluid viscous dampers.

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“…Under severe earthquakes, the ductile behavior of the structural elements allows inelastic drifts leading to the overall system's energy dissipation capability (Farzampour and Eatherton 2018b;Luth et al 2008;Mansouri et al 2016b;Mirzai et al 2018Saffari et al 2013, Farzampour andYekrangnia 2014). In various structural applications, shear links could be implemented by strategic material removal to concentrate the inelasticity and damages in one part of the structure while the remaining parts are intact and undamaged (Atasever et al 2018;Farzampour and Eatherton 2018a;Kim et al 2016;Zeynali et al 2018.…”

Section: Introductionmentioning

confidence: 99%

Force–Displacement Relationship of the Butterfly-Shaped Beams Based on Gene Expression Programming

et al. 2020

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Structural steel plates with engineered cut-outs to exhibit controlled yielding mechanism is recently proposed for desirable structural performance compared to conventional systems.Butterfly-shaped beams with hexagonal cut-outs inside of the beam's web is implemented to better align the bending strength diagram along the link length with the corresponding demand shape of the applied moment diagram. In previous studies, it has been reported that these links have a substantial energy dissipation capability and sufficient ductility which necessities further investigations and structural behavior prediction studies. In this study, a set of 240 nonlinear finite element models are developed for creation of a database and subsequently calibrated with finite element software packages. The capability of the gene expression programming (GEP) is explored for prediction of force-displacement relationship of a butterfly-shaped beam. Two new models are developed based on the reliable generated database. Subsequently, the proposed models are validated with several conducted analysis and statistical parameters, for which the comparisons are shown in details. The results represent that the proposed models are able to predict the forcedisplacement relationship of a butterfly-shaped beam with satisfactory accuracy.

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Experimental and numerical investigation of lead-rubber dampers in chevron concentrically braced frames

Cited by 26 publications

References 18 publications

Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

Study on the damping efficiency of continuous beam bridge with constant cross-section applied by lead rubber bearings and fluid viscous dampers

Force–Displacement Relationship of the Butterfly-Shaped Beams Based on Gene Expression Programming

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