agH 1[m/s^2] "Design ground acceleration"
qH 1.0 "Behavior factor"
SH 1.5 "Soil factor"
TbH 0.1[s] "Period time, first breakpoint"
TcH 0.25[s] "Period time, second breakpoint"
TdH 1.2[s] "Period time, third breakpoint"
betaH 0.2 "Lower limit factor"