ASCE 7/UBC Horizontal Design Spectrum - Thailand
When Sd1 > Sds
Thailand code Figure 1-4-3
Specifically, the previously flat section of curve (Segment 2) rises from SDS at T = 0.2 to SD1 At T = 1.0
Note: The above curve can be obtained by selecting
Sloped 2nd Segment on the Site Specific Spectra page of the Seismic Wizard.