Quasistatic Seismic Damage Indicators for RC Structures from Dissipating Energies in Tangential Subspaces

Table 1

Limit states and damage levels according to FEMA 273.

	Structural limit states	Damage levels	Damage indices
ND	No damage, virgin structure	0	0.00
IO	Immediate occupancy	I	0.05
ID	Incipient damage		0.10
LS	Life safety threatens	II	0.20/0.25
CP	Collapse prevention	III	0.40/0.50
IC	Incipient collapse	IV	>0.90