DISPLACEMENT-BASED SEISMIC DESIGN
DISPLACEMENT-BASED SEISMIC DESIGN
DISPLACEMENT-BASED SEISMIC DESIGN
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Dimensionless Moment (M N<br />
/f'cD 3 )<br />
0.2<br />
0.16<br />
0.12<br />
0.08<br />
0.04<br />
0<br />
ρ l<br />
= 0.04<br />
ρ l<br />
= 0.03<br />
ρ l<br />
= 0.02<br />
ρ l<br />
= 0.01<br />
ρ l = 0.005<br />
Dimensionless Curvature (φ y<br />
D/ε y<br />
)<br />
2.5<br />
2<br />
1.5<br />
1<br />
0.5<br />
0<br />
Ave. +10%<br />
ρ l<br />
= 0.04<br />
Ave. -10%<br />
ρ l<br />
= 0.005<br />
Average φ y<br />
D/ε y<br />
= 2.25<br />
Average φ y<br />
D/ε y<br />
= 2.25<br />
0 0.1 0.2 0.3 0.4<br />
0 0.1 0.2 0.3 0.4<br />
Axial Load Ratio (N u<br />
/f'cA g<br />
)<br />
Axial Load Ratio (N u<br />
/f' c<br />
A g<br />
)<br />
(a) Nominal Moment<br />
(b) Yield Curvature<br />
DIMENSIONLESS NOMINAL MOMENT AND YIELD<br />
CURVATURE FOR CIRCULAR COLUMNS<br />
STRENGTH VARIES; YIELD CURVATURE IS CONSTANT<br />
9
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