TY  - JOUR
T1  - A comparative study of linear and nonlinear mass damping systems under seismic excitation
AU  - Tsiatas, George C.
AU  - Charalampakis, Aristotelis E.
AU  - Tsopelas, Panos
JO  - Engineering Structures
VL  - 219
SP  - 110926
PY  - 2020
DA  - 2020/09/15/
SN  - 0141-0296
DO  - https://doi.org/10.1016/j.engstruct.2020.110926
UR  - http://www.sciencedirect.com/science/article/pii/S0141029619344852
KW  - Seismic response
KW  - Linear mass damper
KW  - Nonlinear energy sink
KW  - Friction nonlinear energy sink
AB  - A comparative study of the seismic response of structures equipped with linear and nonlinear mass damping systems is presented herein. Three optimized mass damping systems mounted at the top of a linearly elastic two-degree-of-freedom building are tested under an artificial seismic motion to assess their response. The artificial seismic motion is generated using the SIMQKE software and matching a specific response spectrum. The mass damping systems consist of (i) a Linear Mass Damper (LMD), (ii) a type-I Nonlinear Energy Sink (NES) with a nonlinear elastic spring of the cubic oscillator, and (iii) a Friction Nonlinear Energy Sink (FNES) which extends the NES with a friction element and a linear elastic spring of potentially negative stiffness. The results for each configuration are validated with a set of real scaled ground motion time histories matching the same specific spectrum, and a quantification of the response variability in relation to the input variability is attempted. An interesting observation is that the artificially generated excitation consistently underestimates critical design/response quantities, as compared to the average response of the set of real ground motions.
ER  -