# Combination of Earthquake Effects for Perpendicular Directions

**Symbols**

* E _{d} =* Direction of combining applied design on the total earthquake effects

*Directional coupling applied design basis vertical seismic effect*

**E**_{d }^{(H)}=*(X) design under the influence of earthquakes in the principal direction of earthquake effects*

**E**_{d }^{(X) }=*(Y ) earthquake effect under the effect of the earthquake in the direction of the design*

**E**_{d }^{(Y) }=**4.4.2.1 -** Horizontal seismic structural system under the influence of seismic analysis of **4.7** or **4.8.2** case from made by one of the methods listed horizontally perpendicular (X) and (Y) seismic impacts occurring earthquakes defined in accordance with **Eq. (4.9)** "defined in will be combined as follows:

Wherein *M *_{d }^{(X)} and *E *_{d }^{(Y)} , at any cross section perpendicular (X) and (Y) under the influence of earthquakes in accordance **04/10** 'by defined and calculated separately earthquake impact, *M *_{d }^{(H),} the *coupling direction* applied *design basis vertical seismic effect* 'n symbolizes.

**4.4.2.2 - If** the earthquake calculation of the carrier system under the effect of horizontal earthquakes is made in the *time ***history ***area with* the method given in **4.8.3** , since the earthquake components in the horizontal (X) and (Y) directions are defined simultaneously according to **2.5** , the combined horizontal earthquake effect *E *_{d }^{(H)} is obtained directly as a result of this calculation.