4.8.4. Amplification of Reduced Internal Forces and Displacements According to Equivalent Base Shear Force
4.8.4.1 - In case V tx (X) <E * V tE (X) for any earthquake direction (X) , all reduced internal force obtained by the modal calculation method applied according to 4.8.2 or 4.8.3 and The displacement magnitudes will be enlarged by multiplying the equivalent base shear amplification coefficient β tE (X) given by Eq (4.31) .
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Wherein V t (X) to the lateral force Method according to Eq. (4.21) calculated by the total equivalent seismic load (base shear force), V tx (X) is 4.8.2 or 4.8.3 according x direction 'in It shows the total earthquake load obtained . γ The factor of E will be taken as follows:
(a) If at least one of the A1 , B2 or B3 type irregularities defined in Table 3.6 is present in the building, γ E = 0.90 shall be taken.
(b) If none of the irregularities defined in Table 3.6 are present in the building, γ E = 0.80 shall be taken.
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The combined response for the modal base shear (Vt) iscompared with the calculated base shear (V) using the equivalent lateral force procedure automatically. If ıt’s less than 100% of the calculated base shear (V) using the equivalent lateral force procedure, the forces shall be multiplied by V∕Vt automaticaly. |
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Where the combined response for the modal base shear (Vt) is less than CsW, drifts shall be multiplied by CsW∕Vt automaticaly. |
A base shear (V) shall be calculated in each of the two orthogonal horizontal directions using the calculated fundamental period of the structure T in each direction and the procedures of Section 12.8.
12.9.1.4.1 Scaling of Forces
Where the calculated fundamental period exceeds CuTa in a given direction, CuTa shall be used in lieu of T in that direction. Where the combined response for the modal base shear (Vt) is less than 100% of the calculated base shear (V) using the equivalent lateral force procedure, the forces shall be multiplied by V∕Vt where
V = the equivalent lateral force procedure base shear, calculated in accordance with this section and Section 12.8, and
Vt = the base shear from the required modal combination.
12.9.1.4.2 Scaling of Drifts
Where the combined response for the modal base shear (Vt) is less than CsW, and where Cs is determined in accordance with Eq. (12.8-6), drifts shall be multiplied by CsW∕Vt.
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TBDY 'den farklı olarak kuvvetler ve göreli öteleme aynı oranda arttırılmıyor. Her ikisi içinde otomatik hesap yapılmalı ve belirlenen katsayılar ile arttırılmalıdır. |
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