Energy Dissipator Steel Cushions: Closed Form Equations for the Combining Actions

Abstract eng:
Earthquakes impart significant amount of energy into the structures. The input energy is dissipated by the plastic deformation of structural members in the conventional design practice. Nevertheless, the input energy can be dissipated by using additional damping devices and hence the damage can be transferred from the structural members to the energy dissipaters. A novel energy dissipater device produced by bending of mild steel has been developed in Structural and Earthquake Laboratory (STEELab) of Istanbul Technical University within the framework of FP7: SAFECLADDING Project. The behaviors of cushions have been determined by uni-axial and bi-axial loading tests as well as the finite element models which were prepared in ABAQUS. The closed form equations for the combining shear and axial force effects have been drived by using the classical flexibility method to define load carrying capacity of P u , yield displacement of δ y and ultimate displacement of δ u . Accuracy of the closed form equations is evaluated not only comparing with the test results but also the numerical results obtained from the ABAQUS models for varying cushion dimensions. An acceptable correlation is obtained between the results of the closed form equations and the numerical as well as the experimental studies.

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