DISPLACEMENT-BASED SEISMIC DESIGN
DISPLACEMENT-BASED SEISMIC DESIGN
DISPLACEMENT-BASED SEISMIC DESIGN
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.<strong>DESIGN</strong> <strong>DISPLACEMENT</strong> SPECTRA (1)<br />
• Can be approximately generated from design<br />
acceleration spectra (5% damping) using accelerationdisplacement<br />
relationships:<br />
∆ (T,5) = (T 2 /4π 2 ).g.a (T,5)<br />
• Values for damping other than 5% can be generated<br />
from relationships such as:<br />
∆<br />
T , ξ<br />
= ∆<br />
T ,5<br />
⋅<br />
⎛<br />
⎜<br />
⎝<br />
2<br />
7 ⎞ ⎟⎠<br />
+ ξ<br />
0.5<br />
“Normal” records, EC8 1998<br />
∆<br />
T , ξ<br />
= ∆<br />
T ,5<br />
⋅<br />
⎛<br />
⎜<br />
⎝<br />
2<br />
7 ⎞ ⎟⎠<br />
+ ξ<br />
0.25<br />
“Velocity pulse” records (Forward<br />
directionality) (tentative!)<br />
32
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