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and the terms for earthquakes in (X) and (Y) directions, respectively, belong to a typical n'th natural vibration mode in the i'th step of the thrust analysis, which are taken into account separately. It is the typical value of displacement, plastic deformation or internal force calculated by taking = 1. In the calculation of these terms, the linear (linear) mode combination analysis performed in the i'th step is performed to the system.After finding the real value of the as described in Determination of Modal Pseudo-Acceleration, Modal Displacement Increment and Cumulative Constant Scale CoefficientFactor the values ​​of Δr _xn ⁽ⁱ⁾ and Δr _yn ⁽ⁱ⁾ are calculated for each mode with the cumulative scale coefficient.