Symbols
T = Natural vibration period [s]
T A = Horizontal elastic design acceleration spectrum corner period [s]
T B = Horizontal elastic design acceleration spectrum corner period [s]
S ae (T) = Horizontal elastic design spectral acceleration [g]
S aR (T) = Reduced design spectral acceleration [g]
D = StrengthReductionCoefficient
I = Building Importance Coefficient
R = Structural System Behavior Coefficient
R a (T) = Predicted ductility capacity and period dependent Earthquake Load Reduction Coefficient
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:
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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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Topics covered in this section:
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Ie= Seismic importance factor
R = Response modification coefficient
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Modal Response Parameters
The seismic force-related design parameters, such as story drift values, support forces, and individual member forces for each mode of response are calculated using each mode's properties and the response spectra divided by the quantity R ∕ Ie. The value for displacement and drift quantities is multiplied by the quantity Cd ∕ Ie.
The design response spectrum is simulated of linear elastic structures. The inelastic behavior of the structure is explained by dividing the spectral coordinates by the response modification coefficient, R. Multiplying the spectral coordinates by the Importance Factor, Ie, provides the additional power needed to improve the performance of important structures. The displacements that are calculated using the response spectrum must be amplified by Cd and reduced by Ie to produce the expected inelastic displacements.
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