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Smart Structures and Systems Volume 27, Number 5, May 2021 , pages 819-836 DOI: https://doi.org/10.12989/sss.2021.27.5.819 |
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Energy dissipation by friction for sliding blocks subjected to near-fault seismic base motion |
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Pablo M. Barlek Mendoza, Daniel Ambrosini and Bibiana M. Luccioni
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| Abstract | ||
| The objective of this study was to determine friction ratios that maximize energy dissipation on a seismic damper. The aforementioned friction damper basically consists of mass blocks that are able to slide on a flat surface. To carry out this analysis, a numerical-experimental approach was used. Firstly, the theoretical background and equations of motion for a SDOF system consisting of a mass supported on a flat surface with friction are introduced. Special emphasis is made on the fundamentals of stick-slip motion as well as energy considerations. Secondly, experimental studies carried out on a shaking table with harmonic and seismic records are described. These tests consisted of lead blocks contained on a U-shaped channel type aluminum section with its open end facing upwards. This configuration allowed blocks to slide solely in the direction of the base motion. Five different types of contact interfaces were considered to determine potential friction coefficients for the damper's design. Additionally, computational models based on rigid-body dynamics are presented. Numerical results were satisfactory particularly when comparing model's dissipated energy with empirical results. An analysis was carried out by calculating dissipated energy for the experimentally-calibrated models with varying friction ratios. For this purpose, eight near-fault seismic records were selected. Intervals with friction coefficients that maximize energy dissipation are proposed for each record. Finally, relationships between the computed friction ratios and register's peak ground acceleration (PGA) and root mean square acceleration (RMS) are discussed. | ||
| Key Words | ||
| friction; stick-slip motion; energy dissipation; near-fault earthquakes | ||
| Address | ||
| (1) Pablo M. Barlek Mendoza, Bibiana M. Luccioni: Instituto de Estructuras, Universidad Nacional de Tucumán, 1800 Independencia Avenue, República Argentina; (2) Daniel Ambrosini: Universidad Nacional de Cuyo, Facultad de Ingenier&$237;a, Mendoza, República Argentina; (3) Daniel Ambrosini, Bibiana M. Luccioni: Consejo Nacional de Investigaciones Científicas y Técnicas, República Argentina. | ||