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Uni-axial behavior of energy dissipative steel cushions
Hasan ozkaynak,Arastoo Khajehdehi,Ahmet Gullu,Faraz Azizisales,Ercan Yuksel,Faruk Karadogan 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.6
Seismic excitations may impart a significant amount of energy into structures. Modern structural design attitudes tend to absorb some part of this energy through special dissipaters instead of heavy plastic deformations on the structural members. Different types of dissipater have been generated and utilized in various types of structures in last few decades. The expected earthquake damage is mainly concentrated on these devices and they may be replaced after earthquakes. In this study, a low-cost device called <i>energy dissipative steel cushion</i> (EDSC) made of flat mild steel was developed and tested in the Structural and Earthquake Engineering Laboratory (STEELab) of Istanbul Technical University (ITU). The monotonic and cyclic tests of EDSC were performed in transversal and longitudinal directions discretely. Very large deformation capability and stable hysteretic behavior are some response properties observed from the tests. Load vs. displacement relations, hysteretic energy dissipation properties as well as the closed form equations to predict the behavior parameters are presented in this paper.
Numerical Modelling of Energy Dissipative Steel Cushions
Ahmet Gullu,Eleni Smyrou,Arastoo Khajehdehi,Hasan ozkaynak,I. Engin Bal,Ercan Yuksel,Faruk Karadogan 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
Energy dissipative steel cushions (EDSCs) are simple units that can be used to join structural members. They can absorb a substantial amount of seismic energy due to their geometric shapes and the ductile behavior of mild steel. Large deformation capability and stable hysteretic behavior were obtained in monotonic and cyclic tests of EDSCs in the framework of the SAFECLADDING project. Discrete numerical modeling strategies were applied to reproduce the experimental results. The fi rst and second models comprise two-dimensional shell elements and one-dimensional fl exural frame elements, respectively. The uncertain points in the preparation of the models included the mesh density, representation of the material properties, and interaction between contacting surfaces. A zero-length nonlinear link element was used in the third attempt in the numerical modeling. Parameters are recommended for the Ramberg–Osgood and bilinear models. The obtained results indicate that all of the numerical models can reproduce the response, and the stiff ness, strength, and unloading and reloading curves were fi tted accurately.