basement curtains

S

smsenturk

New Member
Hello, good work, I had to make a revision in the building I completed the analysis and drawing. I converted the outer beams into curtains and converted the second basement floor into a rigid floor. At the end of the analysis, I received a cutting warning in the columns, while the Q8/8 stirrup was sufficient before, the stirrup diameters increased to 12. Shouldn't these curtains ease the system in my production, I am a new user in the program, or did I make a model error somewhere? Many thanks in advance...
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Hello My suggestions; --Removing the (DS) ticks on the columns and curtains, --2. If you make the K04 beam on the basement floor 30/60, you can get an error-free solution. Unver ÖZCAN
 
Hello. However, what I am really curious about is that when there is no curtain in our building, the sections that save comfortably cause problems when I make models with curtains. This did not seem normal to me, I wonder if there is a point in the model that I do not know about the curtain settings. Below I have added the picture of the second basement floor column reinforcements, the first is curtain wall system, stirrups are too much compared to the second picture. Thanks
 
Hello, in "Analysis Settings/General Settings" tab "Eccentricity and basement calculation method "Dynamic If you analyze by selecting " with eccentricity and the two-load calculation method described in 4.8.5.1, 4.8.5.2 and 4.8.5.3, there is a decrease in column shear forces and, accordingly, in column stirrups. The regulation proposes a conservative and approximate method for solving the basement structures together. You use this method in the preliminary design and choose the two-loading method in the final design. The method proposed as a solution with the bottom and top together in the regulation is very high-rise and rigid basement has more than one. It can approach the values obtained in the solution made upside down in buildings. In this way, it may give more unfavorable results in low-rise buildings smaller than 15. 1- Two-Stage Analysis It is the two-stage analysis method mentioned in 4.8.5. According to the method, lower section, rigid basement floors, and upper section for two different situations in one model analyzed and the results are combined. In the first stage, internal forces and displacements are obtained in both the upper and lower sections as a result of the analysis made by considering only the masses of the upper section. During the analysis, R and D coefficients suitable for the carrier system should be selected from Table 4.1 for the upper section. In the second stage, the analysis is made by considering only the rigid basement floors, for the lower section (Ralt/I)=2.5 and Dalt=1.5. As a result of this analysis, internal forces and displacements in the subsection elements are obtained. Combination of Upper and Lower Analysis The results obtained after the analysis are combined according to the ductile and non-ductile internal forces according to TBDY 2018 4.10.1. 2- One-stage analysis This is the one-stage analysis method mentioned in 4.3.6. In this method; A single analysis model is created for the superstructure and rigid basement floors. Analysis is made using the masses of the superstructure and rigid basement floors. R and D coefficients for the lower and upper sections are different as per TBDy 2018 and different design spectra are used. In accordance with TBDY 2018 4.3.6.2, the upper and lower section elements are increased with the D coefficient in accordance with the ductile and non-ductile behavior definitions. For the superstructure, the R and D coefficients determined according to the carrier system type in accordance with Table 4.1 are used, while for the rigid lower section, R/I =2.5 and Dalt=1.5. This acceptance is made in accordance with the following regulations. Vüst = 0 and as a result of this operation Ra,low is determined. Good work
 
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