Global Seismic Fragility Functions for Low-Rise RC Frames with Construction Deficiencies
Table 4
Considered frame typology damage-specified performance level [26].
Limit states for observed damage
Parameters
Roof drift (%)
Base shear coefficient
Description of damage
Slight damage
θ1 = 0.6θy0.78
0.24
On column ends (top and bottom) flexure cracks
Moderate damage
θ1 = θy1.30
0.36
On column ends (top and bottom) significant flexure cracks on beam ends slight flexure cracks on joint panel regions shear crack spreading
Extensive damage
θ3 = 0.5 (θy + θu)2.50
0.48
On column ends (top and bottom) cracks aggravated, crushing with spalling of concrete material on beam ends significant flexure cracks on joint panel regions shear crack aggravated further
Incipient collapse
θ1 = θu3.70
0.41
On column ends (top and bottom) cracks aggravated, crushing with spalling of concrete material on beam ends significant flexure cracks major shear cracking on the joint panel regions with significant concrete detachment.
