Page 133 - Çevre Şehir İklim İngilizce - Sayı 4

Cenk Alhan - Mert Hacıemiroğlu

Building effective period for DD1 earthquake level (T ) is calculated by
M
using Equation (6) (TBDY (2018), Equation 14B.31) as

Here K is the effective rigidity obtained by the equation (3) for the
M
maximum nominal displacement D M at the DD1 level. T =3.44 s is obtained
M
since P=4992.62 kN, nominal μ=0.08 and K =1697.7 kN/m for effective radius
M
of curvature R =6.9 m and total weigh of the building is W=159764 kN.
c
Horizontal displacement (D ) at the effective rigidity center of isolation
M
system for DD1 earthquake ground motion level is calculated by using DD1
horizontal design spectrum obtained for 5% damping. A new displacement
value is calculated by using the formula relation given in Equation (7)
(TBDY (2018), Equation 14.30) with building effective period T M obtained
for a projected displacement value and the damping scaling coefficient of
spectral acceleration η M corresponding to this period. Until the projected
displacement and the target displacement are becomes equal final D M is
determined with the iteration. When the iteration is completed as a result
of the first value to be selected, D is ultimately found as =40.4 cm for the
M
sample structure under study.

Taking into account the additional displacements from the buckling of the
superstructure and insulation system, the total displacement at the center of
the effective rigidity of the insulation system for the DD1 earthquake ground
motion level (D TM ), are calculated using Equation (8) (TBDY (2018), Equation
14.34):

Here, e gives total of additional eccentricity calculated as 5% of the
plan dimension perpendicular to the earthquake load with the eccentricity
measured between the center of gravity of the superstructure and the rigidity
center of the insulation system,

122 The Journal of Environment, Urban and Climate