Time-History Analysis of Frictionally Damped Structures
Tomme: LVII (LXI) Fascicle: 4 | 2011
Pages: 65-74
Abstract text:
During major seismic actions, a significant amount of energy is induced to structures. The means by which this energy is dissipated, determines the level of structural degradation. Special emphasis is placed on avoiding loss of human lives due to the earthquake action. In order to achieve this, the structures are designed ductile so that energy is dissipated by the system’s elements by bending, twisting or degradation. This dissipative mechanism involves significant degradation of the structures thus leading to significant post-earthquake rehabilitation costs. If the amount of energy induced in the structure can be controlled or, if part of it can be dissipated mechanically by independent structures, the seismic response of the buildings is improved and the potential damage greatly reduced. These objectives can be achieved via new techniques such as base isolation or enhancement of energy dissipation capacity of the structures using damping devices. When possible, design codes suggest the use of the last technique as a cheaper and more viable way to improve the behaviour of structures subjected to earthquakes. The hereby paper proposes a time history analysis of structures equipped with frictional dampers, highlighting the benefits resulting from the use of such devices.
Key Words:
time-history analysis; friction dampers; slip load
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