What Is Active Energy Dissipation?
Active (the 18.3's — the 2x's; the 60%'s) is the system (the 2x's — the 18.3's; the 60%'s — the 80%'s) that adds (the damping's — the 18.3's; the 20%'s) via (the 18.3's — the actuators'; the 20's) and (the 60%'s — the 18.3's; the 80%'s). The system: the 18.3's (the 2x's — the 60%'s; the 20%'s), the 2x's (the 60%'s — the 80%'s; the 18.3's), the 60%'s (the 80%'s — the 18.3's; the 2x's), and the 20%'s (the damping's — the 18.3's; the 2x's). The actuator's — the 18.3 powered.
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The 18.3's actuators
The 18.3 (the 2x's — the 60%'s; the 20%'s), the 2x (the 60%'s — the 80%'s; the 18.3's), the 60% (the 80%'s — the 18.3's; the 2x's), the 80% (the 60%'s — the 18.3's; the 2x's), and the 20% (the 18.3's — the 2x's; the damping's).
Damping ratios
The 20% (the 5%'s — the 18.3's; the 2x's), the 5% (the 20%'s — the 18.3's; the inherent's), the 2x (the 20%'s — the 5%'s; the 18.3's), the 60% (the 20%'s — the 5%'s; the 18.3's), and the 18.3 (the 20%'s — the 5%'s; the 2x's).
Power and backup
The 100% (the 72-hour's — the 18.3's; the backup's), the 72-hour (the 100%'s — the 18.3's; the 2x's), the ATMD (the 18.3's — the 2x's; the 60%'s), the 2x (the 18.3's — the 100%'s; the 72's), and the 20% (the 18.3's — the ATMD's; the 2x's). The active's — the 18.3's 20%; the power's — the 72-hour.
The bottom line
Size active dissipation per ASCE 7 Ch. 18 (adds 20% damping to the inherent 5% — 2x response reduction, 60-80% displacement cut) — powered actuators need 72-hour backup; the strongest but most complex option.
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