# Design Response Spectrum Definition (5.2.1)

By using the coefficients obtained from the map by the program , the

*spectrum curve*given in**Figure 2.1**with**Equation**2.2 - 2.3 is automatically obtained.

**ICONS**

* F _{S} =* Local ground impact coefficient for the short-period region

*Local ground impact coefficient for a period of 1.0 seconds*

**F**_{1}=*Short-period design spectral acceleration coefficient [dimensionless]*

**S**_{DS}=*Design spectral acceleration coefficient for a period of 1.0 seconds [dimensionless]*

**S**_{D1}=*Short period map spectral acceleration coefficient [no dimension]*

**S**_{S}=*Map spectral acceleration coefficient for a period of 1.0 seconds [dimensionless]*

**S**_{1}=*Natural vibration period [s]*

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

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

**T**_{B}=*Transition period to constant displacement region in horizontal elastic design spectrum [s]*

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

**S**_{ae (T)}=*While* any of the *thrust methods* are used within the scope of *Assessment and Design* Based on **Strain, the ***horizontal elastic design acceleration spectrum* defined in **Section 2.3.4 of the** earthquake effect **TBDY is*** *used.

Incremental Response Spectrum Analysis (IRSA Method) As explained in detail under the heading, the *thrust analysis* method is used, **while the** horizontal elastic design spectrum defined in **TBDY Section 2.3.4 is** used and the earthquake load reduction coefficient is not used in the ŞGDT approach.

**Related Topics**