Symbols
c = Distance of curtain parts between cross-section gravity centers
FiE = Total load actingon the floor
m = Mass of the relevant floor
H = The height of the upper section of the i'th storey measured from the base of the building [m]
M1 = Bending moment at the base of the curtain part due to the earthquake effect
M2 = Bending moment at the base of the curtain due to the earthquake effect
MDEV = Total overturning moment at the curtain base
Nv = Axial force at the curtain base
Ω = Degree of commitment
VtE = Total load selected to be distributed across building floors at inverted triangle unit loading
General Assesment
The carrier system of the building was created with beamless floors and curtains. As required by TBDY 2018 4.3.4.4, all of the earthquake impacts should be covered by walls with high ductility level and / or non-gaps or walls without gaps with limited ductility level in structural systems containing beamless floors. Due to the building's BYS = 3 and high ductility level, A12 or A13 bearing systems should be selected for the carrier system type.
Curtains with high ductility level in the XX direction of the building and curtains with high ductility level were used together. In order to be able to make the appropriate R and D selection for the hollow screen, we first need to check the degree of gap curtain bond. According to the TBDY 2018 4.5.4.5 condition, this check is performed automatically .
However, in order to stay on the safe side, since the R coefficient of the non-gapless curtain carrier system with high ductility level is lower, a high ductility level wall was chosen for the X direction.
On the Y direction of the building, all of the earthquake effects are covered by curtains with high ductility level without gaps.
Bond Degree Calculation and Gaped Curtain Acceptance
The degree of adherence of the hollow curtains formed by connecting two U curtain arms at the core of the building with tie beams should be checked in accordance with TBDY 2018 4.5.4.5. If the degree of commitment is equal to or greater than 1/3, we can consider this curtain group as a hollow curtain.
The important issue in this calculation is the stiffness distribution within the wall group. Therefore, for ease of calculation, the core curtain will be separated from the building and analyzed separately.
In this calculation, an inverted triangle unit is loaded from the top floor to the lowest floor. For the load distribution, the equations used in the distribution of equivalent earthquake load according to floors are used. The only difference is that there is no additional whip force on the top floor. The point to note here is that this loading is not applied to the basement floors, this process is applied between the first floor above the basement floor and the last floor.
Note: V tE in this equation is the total load we selected in this calculation. The numerical value of the load does not matter.
The equation used for calculation is:
Here, the total tipping moment at the base of the wall with M DEV tie beam (hollow), M 1 and M 2 as the sum of the bending moments obtained at the base due to the earthquake effect in the curtain parts forming the wall with bond beams , and N V as the sum of the shear forces formed in the bond beams under the earthquake effect along the whole wall height. corresponds to equal tensile and pressure axial forces formed at the base of the curtain parts. c shows the distance between the cross-section gravity centers of the curtain pieces.
In the program, this calculation is made automatically when the gap is selected and the results are detailed in the earthquake regulation report.
According to this control, our core curtain is considered as a hollow curtain. However, as stated before, in order to stay in the safe zone, due to the fact that the curtains with and without gaps work together in the X direction, an arrangement suitable for the curtain without gaps was made in the selection of R and D.
Selected R and D Coefficients
A13 gapless curtain selection was made for both directions.
