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a 1 (X,k) = modal pseudo-acceleration [m/s2] of the first mode modal single degree of freedom system at the kth push step for earthquake direction [m/s2]
d 1 (X,k) = (X) earthquake modal displacement of the modal single degree of freedom system belonging to the first mode in the kth thrust step for the kth thrust for the earthquake direction[m]
m i = the total mass of the i th floor
m ix1 (X,1) = (X) the first thrust in the x-axis direction for the earthquake directionith direction i th floor modal effective mass [t]
m tx1 (X,1) calculated accordingto according to the constant mode shape determined in step and never changed during the thrust calculation
= (X) modal effective mass of the base shear force calculated according to the constant mode shape determined in the first thrust step in the x-axis direction and never changed during the thrust calculation [t] u ix1 (X,k) = (X) for the earthquake direction Displacement [m] calculated in the x-axis direction at the i-th floor at the kth push step [m]
u Nx1 (X,k) = (X) displacement calculated in the x-axis direction at the Nth floor (top of the building) at the kth push step for the earthquake direction [ m]
V tx1 (X,k) = Base shear force calculated in the x-axis direction at the kth thrust step for the (X) earthquake direction [kN]
Φ Nx1 (1) = Theamplitude The amplitude of the constant mode shape in the x directiondetermined direction determined at the first thrust step at the Nth floor and never changed during the thrust calculation
Γ 1 (X,1) = (X) determined in the first thrust step for the earthquake direction and throughout the thrust calculation modal contribution factor calculated accordingto according to the constant mode shape that is never changed
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In this case , the thrust curve whose coordinates are base shear-peak displacement is converted into a modal capacitance diagram whose coordinates are modal displacement-modal pseudo-acceleration TDY Figure 5B.1(b) . The modal capacity diagram is used to find the building performance point and the displacement demand is obtained. Obtaining the performance point is described in Determination of Modal Displacement and Performance Point (5B.3) .
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