# Approximate Vertical Earthquake Effects

Vertical earthquake effect is applied automatically using

**Equation 4.10**.

**Symbols**

* S _{DS} =* Short period design spectral acceleration coefficient [dimensionless]

*(Z) direction earthquake effect under the effect of the design underlying earthquake*

**E**_{d }^{(Z)}_{ }=*Constant load effect*

**G =**Elements described in TBDY 2018 4.4.3.1 (a) - (d), Vertical Earthquake Effects , and the vertical earthquake effect of the external elements are determined by the following equation. The loading state symbolized by Ez (G) under the heading of loading states is the value expressed by a certain ratio of the constant load calculated by the following equation. S_{DS}is the spectral acceleration coefficient.

Information is also included in the subtitle of loading statuses and loading combinations in the optional report.