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    Using the coefficients obtained from the map, horizontal elastic design spectrum curve is automatically determine according to ASCE 7-16.

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With the spectral response acceleration parameters obtained from USGS depending on the coordinates, horizontal elastic design spectrum Sa isdetermined according to the formula below. It is represented by a total of 4 functions, different in each region. It’s shown in the graph below.

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

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