DISPLACEMENT-BASED SEISMIC DESIGN
DISPLACEMENT-BASED SEISMIC DESIGN
DISPLACEMENT-BASED SEISMIC DESIGN
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FUNDAMENTALS OF DDBD<br />
F<br />
m e<br />
h e<br />
F u<br />
F n<br />
K e<br />
K i<br />
∆y ∆d<br />
(a) SDOF Simulation (b) Effective Stiffness K e<br />
Damping (%)<br />
0.25<br />
0.2<br />
0.15<br />
0.1<br />
0.05<br />
←<br />
Elasto-Plastic<br />
Steel Frame<br />
Concrete Frame<br />
Concrete Bridge<br />
Hybrid Prestress<br />
Displacement (m)<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
∆ d<br />
→<br />
5%<br />
10%<br />
15%<br />
20%<br />
30%<br />
0<br />
0 2 4 6<br />
Displacement Ductility<br />
↑<br />
(c) Equivalent damping vs. ductility<br />
0<br />
↓<br />
T e<br />
0 1 2 3 4 5<br />
Period (seconds)<br />
(d) Design Displacement Spectra<br />
24
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