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For each direction, the second order indicator value θII,i is calculated determined automatically according to TBDY 4.9.2 for all floors stories. If maximum θ II,max satisfies the condition given below; Secondsecond-order effects are effect is not taken into account in determining consideration to determine the internal forces based on the design.
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Ch is a coefficient calculated determined depending on the non-linear hysteretic behavior of the carrier structural system and is taken as 1 for steel structures as per TBDY 2018 4.9.2.2.
If the condition given in Equation 4.36 is not satisfied , the internal forces obtained from the horizontal earthquake effects are increased with the βII coefficient determined by the equation below .
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This value calculated for all floors stories is used only to increase the internal forces of the upper section elements as per TBDY 4.9.2.4.
For manual calculationcheck, Vi and wk values are obtained from the Floor Story Parameters section in the upper toolbar Analysis and Design tab of the program.
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The above table from floor X direction From the table above, the X-direction floor forces, Vi, for FX; FY columns are used for the Y direction storey forces. Since the values in in the FX column are only the force acting on the relevant floor, they are added down and the total shear force diagram is created for the building is generated. The following table values given in the column Vi values indicated in the column were table below are obtained in this way.
wk is for the total weight affecting the floor, and the values in the G and Q columns from the table above are combined to be G+0.3Q. Here, 0.3 is the live load participation coefficient factor and it is chosen as 0.3 was chosen for this building.
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Average storey displacement values are used directly as values in the program report. Equation 4.36 is used for limit value calculation. The values of the building used in the calculation are as follows:
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The result of the calculation for the building is given in the earthquake regulation report.
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According to βII =1 for the building . There , there is no increase. If it is greater than 1, it can go to increase should be increased the stiffness.
The excel table for the manual part of the account check can be obtained here.
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