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3.6.2.3 - In buildings with B1 type irregularities, if the sum of the infill wall areas on the i'th floor is higher than that of the upper floor, the filling walls will not be taken into account in the calculation of η ci . Considering the floor where η ci is the smallest, the load-bearing system behavior coefficient given in Table 4.1 in the range of 0.60 ≤ (η ci ) min <0.80 shall be multiplied by 1.25 (η ci ) min value and applied to the whole building in both earthquake directions. However, it will never be η ci <0.60. Otherwise, the earthquake calculation will be repeated by increasing the strength and stiffness of the weak floor.
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