Values expressed as impact/capacity ratio (ECO) are used to control the application limits of linear performance analysis of existing structures . The ECO value is obtained by dividing the total section moment calculated by taking R a =1 under the effect of vertical loads and earthquakes, by the section moment capacity.
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In the linear earthquake calculation applied with the ŞGDT approach in the evaluation of existing structures, the Impact / Capacity Ratios (ECO) of columns and walls are obtained by dividing the total section moment calculated by taking R a = 1 under the effect of vertical loads and earthquakes by the section moment capacity. However, there is an interaction of axial force and biaxial bending in column and curtain elements as shown in the picture below. The axial forces used to calculate the bending moment capacities in columns and walls are the forces calculated by taking R a = 4 under the effect of vertical loads and earthquakes . Under the influence of this axial force, the moment curvature relation of the section is automatically deduced and the moment capacity is determined. Axial force and biaxial bending interaction. It is obtained by using the current material strength in accordance with the knowledge level
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