Examples of relative floor drift control

[HakanŞahin]

Project 1 The floor drift report of the building, whose local soil class is ZE and earthquake parameters are given in the screenshot below, will be checked manually and then compared with the program report. Typical plan view of the building Earthquake parameters Calculation of Ta and Tb values Modal participation factors of +-5% eccentric loadings read from dynamic analysis report[ /b] Active directions are marked with red and blue lines. Modal E1 Modal E2 Modal E3 Modal E4 Selected periods: Tx=0.94939 sec Ty=0.76614 sec Lamda Calculation X direction DD2 Tx =0.94939 > TB=0.778 -> Sae(t) = SD1/T = 0.926 /0.94939=0.981 X direction DD3 Tx=0.94939 > Tb=0.557 -> Sae(t) = 0.473/0.94939= 0.498 Lamdax = 0.498/0.981=0.51 (visible in program =0.5113) Y direction DD2 Ty =0.76614 < Tb=0.778 Sae(t)= SDS = 1.191 Y direction DD3 Ty=0. 0.76614 > Tb=0.557 Sae(t) = SD1/T= 0.473/0. 0.76614 =0.64 lamday= 0.64/1.191 =0.518 (shown in program =0.519) Relative floor drift upper limit control 0.508*72.71/2800(mm) = 0.013 > 0.008 not provided 0.518 *55.63/2800(mm)= 0.0103 > 0.008 not provided

 

[HakanŞahin]

Project 2 The same project, the local soil class ZD, the relative floor drift report of the building, whose earthquake parameters are given in the screenshot below, will be manually checked and then compared with the program report. Typical plan view of the building Earthquake parameters Calculation of Ta and Tb values Modal participation factors of +-5% eccentric loadings read from dynamic analysis report[ /b] Modal E1 Modal E2 Modal E3 Modal E4 Selected periods Tx = 0.93337 s Ty = 0.73874 s. Lamda Calculation X direction DD2 Tx=0.93337 > Tb=0.483 Sae(t)= SD1/T = 0.705/0.93337=0.755 X direction DD3 Tx=0.93337> Tb=0.397 Sae(t)=0.277/ 0.93337=0.297 Lambda= Sae(t)DD3/ Sae(t)DD= 0.297/0.397= 0.392 (appearing in program=0.3928) Y direction DD2 Ty=0.73874>tb=0.483 Sae(t)= SD1/T = 0.705/0.7384=0.954 Y direction DD3 Ty=0.73874>tb=0.397 Sae(t)= SD1/T = 0.277/0.7384=0.375 Lambda= Sae(t)DD3/ Sae(t)DD2=0.397/0.954 =0.393 (visible in the program=0.3928) Relative floor drift upper limit control maximum relative story drift = 0.393 * 55.46 / 2800(mm)=0.0078 mm<0.008 is provided