EVALUATION OF AN INNOVATIVE PASSIVE MITIGATION DEVICE THROUGH EXPERIMENTAL AND NUMERICAL INVESTIGATION

Abstract eng:
There is a great need to develop innovative devices for the absorption of dynamicseismic loads. The present study focuses on the development of such a passive mitigation steel device. The evaluation of the proposed innovative device occurred through experimental and numerical investigations. In this study the passive mitigation device is referred as CAR1. It comprises of three distinguished parts; the external cylindrical ring, the internal prismatic holder and several superimposed blades that are responsible for the transfer of forces between the aforementioned 2 parts. CAR1 is utilized for strengthening either existing or new steel structures or existing R/C structures. By using CAR1, the beam–column frames can be easily and safely strengthened at many predefined levels according to the demands of the seismic loads imposed by international norms and codes. The mechanism of the energy absorption is developed on the superimposed blades through both yielding of steel as well as friction. The number and dimensions of the superimposed blades, their elastoplastic prope rties as well as the friction coefficient at their interface, define the equivalent nonlinear constitutive law of the proposed device. A device with prototype dimensions was fabricated and investigated both numerically and experimentally under cyclic loading conditions. The numerical analyses conducted utilizing the FE software ABAQUS. The experimental sequences occurred at the premises of Laboratory for Strength of Materials and Structures of Aristotle University of Thessaloniki. The investigated variables are the geometry of blades and the number of cycles of the loading sequence. The obtained results revealed the overall mechanical behavior of CAR1. It was proven that the innovative proposed steel device CAR1 is an a lternative system for calibrating and mitigating the seismic loads developed to a structure during an earthquake.

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