Earthquake loading
Based on AS1170.4 2007

Frame type

k_t

Height to uppermost seismic mass, h_n

Natural period to Eq 6.2(7),

Natural period, T₁

TODO: Check that base shear is within 70% of the value using Tn=6.2(7)

Site sub-soil class

Probability factor, k_p

Hazard factor, Z

S_p/μ

Seismic weight, W_t

Base shear, V

Number of levels