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  • It’s determined with the equation 11.4-5 from T=0 to T0 .

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Mathinline
hostConfluence:2933017122
body--uriencoded--$$ \normalsize S_%7Ba%7D=S_%7BDS%7D \bigg( 0.4+0.6 \frac%7BT%7D %7BT_o%7D \bigg) \qquad \qquad \qquad & (11.4-5) $$

  • It’s equal SDS from T0 to Ts .

  • It’s determined with the equation 11.4-6 from Ts to TL .

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Mathinline
hostConfluence:2933017122
body--uriencoded--$$ \normalsize S_%7Ba%7D=\frac%7BS_%7BD1%7D%7D%7BT%7D \qquad \qquad \qquad & (11.4-6) $$

  • It’s determined with the equation 11.4-7 for periods greater than TL.

Mathinline
hostConfluence:2933017122
body--uriencoded--$$ \normalsize S_%7Ba%7D=\frac%7BS_%7BD1%7DT_L%7D%7BT%5e2%7D \qquad \qquad \qquad & (11.

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4-7) $$

Mathinline
hostConfluence:2933017122
body--uriencoded--$$ \normalsize T_%7B0%7D=0.2(S_%7BD1%7D/S_%7BDS%7D) \\ T_%7BS%7D=S_%7BD1%7D/S_%7BDS%7D \\ T_L = long-period \; transition \; period $$

In the Analysis Settings - Response Spectrum Function tab, the horizontal design spectrum is determined and showed by using the design spectral response acceleration parameters.

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