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Steel and Composite Structures
  Volume 43, Number 5, June10 2022 , pages 565-579
DOI: https://doi.org/10.12989/scs.2022.43.5.565
 


Micro-finite element and analytical investigations of seismic dampers with steel ring plates
Ali Mohammad Rousta and Mojtaba Gorji Azandariani

 
Abstract
    This study investigated the yielding capacity and performance of seismic dampers constructed with steel ring plates using numerical and analytical approaches. This study aims to provide an analytical relationship for estimating the yielding capacity and initial stiffness of steel ring dampers. Using plastic analysis and considering the mechanism of plastic hinge formation, a relation has been obtained for estimating the yielding capacity of steel ring dampers. Extensive parametric studies have been carried out using a nonlinear finite element method to examine the accuracy of the obtained analytical relationships. The parametric studies include investigating the influence of the length, thickness, and diameter of the ring of steel ring dampers. To this end, comprehensive verification studies are performed by comparing the numerical predictions with several reported experimental results to demonstrate the numerical method's reliability and accuracy. Comparison is made between the hysteresis curves, and failure modes predicted numerically or obtained/observed experimentally. Good agreement is observed between the numerical simulations and the analytical predictions for the yielding force and initial stiffness. The difference between the numerical models' ultimate tensile and compressive capacities was observed that average of about 22%, which stems from the performance of the ring-dampers in the tensile and compression zones. The results show that the steel ring-dampers are exhibited high energy dissipation capacity and ductility. The ductility parameters for steel ring-damper between values were 7.5 to 4.1.
 
Key Words
    cohesive surface contact; cylindrical shell; sandwich structure; shell/core debonding; truss core
 
Address
Ali Mohammad Rousta:Department of Civil Engineering, Yasouj University, Yasouj, Iran

Mojtaba Gorji Azandariani:1)Centre for Infrastructure Engineering, Western Sydney University, Penrith, Australia
2) Structural Engineering Division, Faculty of Civil Engineering, Semnan University, Semnan, Iran
 

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