Page Comparison

Symbols

F_S = Local ground effect coefficient for short-period regionsite coefficient
F₁ =Local ground effect coefficient for long-period site coefficient (at 1.0 second -s period)
S_DS = Short-period design spectral acceleration coefficient [dimensionless]
S_D1 = Design spectral acceleration coefficient for a period of 1.0 second period [dimensionless]
S_S =Short period map mapped spectral acceleration coefficient [dimensionless]response acceleration parameter at short periods
S₁ =Map mapped spectral acceleration coefficient for 1.0 second period [dimensionless]response acceleration parameter at a period of 1 s
T = Natural vibration period [s]the fundamental period of the structure, s
T_A = Horizontal elastic design acceleration spectrum corner characteristic period [s]
T_B   = Horizontal elastic design acceleration spectrum corner characteristic period [s]
T_L = Transition period to the constant displacement region in the horizontal elastic design spectrum [s] long-period transition period
S_ae(T) = Horizontal elastic design spectral response acceleration [g]

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• The map spectral acceleration coefficients S_s and S₁ values ​​of the coordinates, specified at Building Geometry and Location, were obtained from the AFAD earthquake map data using the Analysis Wizard online option.

• According to the ZA local soil class specified in the geotechnical report, local soil effect coefficients are obtained from TBDY 2018 Table 2.1, and ideCAD Structural automatically calculates the Design design spectral acceleration coefficientsare automatically calculated by the program.

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Ss	0.706
S1	0.205
Fs	0.8
F1	0.8
SDS

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	Mathinline body --uriencoded--$$ \normalsize S_%7BDS%7D = S_S F_S = 0.706 \times0.8 = 0.565 $$
SD1

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	Mathinline body --uriencoded--$$ \normalsize S_%7BD1%7D = S_1 F_1 = 0.205 \times0.8 = 0.164 $$
TA

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	Mathinline body --uriencoded--$$ \normalsize T_A =0.2 \dfrac%7BS_%7BD1%7D %7D%7BS_%7BDS%7D%7D = 0.2 \times \dfrac%7B0.164 %7D%7B0.565%7D = 0.058$$
TB

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Mathinline body --uriencoded--$$ \normalsize T_B =\dfrac%7BS_%7BD1%7D %7D%7BS_%7BDS%7D%7D = \dfrac%7B0.164 %7D%7B0.565%7D = 0.290 $$

• The horizontal elastic design spectral accelerations S_ae(T), which are the ordinates of the horizontal elastic design acceleration spectrum for any earthquake ground motion level considered, are defined in terms of gravitational acceleration [g] depending on the natural vibration period.

• Based on the coordinates, the spectral acceleration coefficients obtained from AFAD and the horizontal elastic design spectrum S_ae(T) are determined according to the formula below. For the horizontal elastic design spectrum, it is represented by a total of 4 functions, different in each region, is shown in the graph below.

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• In order to create the spectrum, the time should be increased with appropriate intervals starting from 0 seconds and stopped at an appropriate T value after T_L=6 s. For this building, the horizontal elastic spectrum starting from T=0 s to T=8 s with 0.05 intervals is calculated in the excel. The obtained spectrum is given in the image below.

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• The horizontal elastic design spectrum is created with the “TBDY 2018 Wizard for Analysis Settings” command using spectrum values specified above.

• The horizontal elastic design spectrum created in the “Analysis Settings” window is shown below.

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