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ECO = Impact / Capacity ratio
R a = Earthquake Load Reduction Coefficient
β v = Shear force dynamic magnification coefficient at the curtain
f ck = Concrete characteristic cylinder compressive strength
V e = Design shear force based on column, beam and curtain
V arm = Above the node point and The smaller of the column shear forces calculated according to Section 4 under
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15.5.2.5 - In reinforced concrete column-beam joints , the shear forces acting on the joint for all boundary situations and calculated from Equation (7.11) should not exceed the shear strength given in 7.5.2.2 . However, Eq. (7.11) from V arms instead 7.3.7 according calculated without concern to hardening V e to be used, Equation (7.12) or Eq. (7.13) 'is wherein the strength calculations f ck instead of 2.15Current concrete strength determined according to the knowledge level defined in. If the joint shear demand exceeds the shear strength, the column-beam junction area will be defined as a brittle damaged element.
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