# Reduced Design Response Spectrum

**Symbols**

* T =* Natural vibration period [s]

*Horizontal elastic design acceleration spectrum corner period [s]*

**T**_{A}=*Horizontal elastic design acceleration spectrum corner period [s]*

**T**_{B}=*Horizontal elastic design spectral acceleration [g]*

**S**_{ae}(T) =*Reduced design spectral acceleration [g]*

**S**_{aR}(T) =*StrengthReductionCoefficient*

**D =***Building Importance Coefficient*

**I =***Structural System Behavior Coefficient*

**R =***Predicted ductility capacity and period dependent Earthquake Load Reduction Coefficient*

**R**_{a}(T) =**4.4.1. Design Acceleration Spectrum Reduced Under Horizontal Earthquake **

**4.7** and **4.8.2** which are given in the calculation method *in the horizontal direction reduced seismic loads* ' s to be used for determining *reduced design acceleration spectrum* 's specific *T* with the ordinate for the natural vibration period of *reduced design spectral acceleration of S *_{R} ( *T* ) , **Eq. (4.8)** It is defined by:

Wherein *S *_{aa} ( *T* ) , **02.02** defined in formula DD-2 earthquake motion **Eq. (2.2)** determined by *the horizontal elastic design spectral acceleration* , expand *R* ( *T *_{a} ) is **from Eq. (4.1)** defined by *Seismic Load Reduction Factor* It shows.

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