soft coat

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insburak355

New Member
Good day everyone, I would like to consult your information on a subject that I am curious about... 1. As far as I know, the common feature of the buildings with soft floors is that the heights of the floors are different (especially the ground floors with shops). I would be very pleased if you could confirm whether my information is correct or not. First of all, I would be very pleased if you could confirm whether the floor shops are glass (thus creating more displacement) 3. The building has non-rigid floor spaces (in dark floors)... a) The question I want to ask about idecad is the following floor+3 Let's say we are designing a floor building, I can enter the wall loads in the form of adding beam-wall load when designing the ceiling of the floor and the other 3 floors, but we cannot affect the wall loads because there is no beam on the floor! Should we define the wall loads at this floor base as basically linear loads? Is there a defect here? b) Does idecad consider the wall loads we affect when analyzing floor displacements? Or does it ignore the walls (if that's the case, I don't think it's a wrong application) c) Finally, what are your recommendations to prevent soft coat formation?
 
Mr. Burak, 1. The common feature of buildings with soft floor irregularities is that they have higher floor heights. If the contribution of the walls to the displacement will be taken into account in the calculations, this option is exactly correct. 3.Slab gaps fall into A2 class irregularity, It has nothing to do with Soft floor. I understand your concern about options a and b. Soft fold is a case of displacements. However, we do not take into account the effects of infill walls on displacement in our calculations. Unfortunately, there is no such sanction in the regulation. We can also discuss its necessity. Infill walls are considered within the scope of weak floors in our regulation. According to TDY 2.3.2.3; The coefficient r is multiplied by the coefficient of strength irregularity. and the calculation is made according to the new R coefficient found. So you have to calculate with greater design forces. therefore, your cross-sections may increase a little. And as you can see, you can improve the displacements, albeit indirectly. However, the only sanction regarding soft storey irregularity within the scope of the regulation is related to the selection of the earthquake calculation method. and the beta coefficient is taken as 0.90. In this sense, İdecad does its part within the scope of the regulation. For this, you should calculate the wall areas in the floor parameters section and introduce them to the program. the program determines a new R coefficient accordingly. If you say that the conditions of the regulation are not enough for me. (which I personally think it should be), if you don't find the reduction in the R coefficient sufficient, you can choose to increase your design forces for the soft layer in the light of your engineering. I would like to share a suggestion that I read in a related source; ''The reason for the formation of soft floors can be eliminated, a wall can be built instead of a showcase, a parking lot and shop floor can not be built. You can try this way :))))))) However, the main issue we need to consider here is that the total base shear force we found in the mode coupling method we chose due to the B2 irregularity is smaller than the equivalent earthquake load method. (because we take into account the entire equivalent mass) We can discuss this separately if you wish. If anyone has any other recommendations for soft coat, I would appreciate it if they could share it. The title did not seem to attract much attention, but this irregularity was present in the majority of my buildings destroyed in the earthquake. I think we need to stay on top of it. Good work. KEMAL YALVAC
 
In some cases caused by architecture, this coefficient can be high no matter what we do. In this case, we should look for an answer to the question of what to do. The general recommendation is to enlarge the column sections and use shear walls to reduce the amount of lateral displacement of the columns in such structures. Apart from this, it would be beneficial to increase the concrete quality, to make calculations to resist the greater earthquake force by reducing the R coefficient, and to make all column stirrups in the soft floor as tight stirrups throughout the floor. Even if the ground floor is not a workplace, this problem may arise again because we add the height of the basement curtain to the floor where it is located. In buildings whose ground floor is residential, it may be appropriate to have the Use Lower Floor Current Value Same as Upper Floor option checked in the Analysis Settings section, and if it is not residential, this sign should be removed for more realistic calculations.
 
Thank you very much for your answers, especially your comment about the white value, it was an answer to my question, "Doesn't we affect the wall load on the foundation, frankly, I thought it would solve without walls... In this case, if the white value is to be glass-weighted as it would be in real production, we can find a more realistic solution by taking it low... 0.5 t/m3 would be appropriate, I think this white value is only used to define the wall above the foundation, right?
 
Hello, Dear ganymade, thanks for sharing. Personally, I think that in buildings with soft storey irregularities, the shear walls should meet at least 50% of the earthquake loads in both directions. However, the R coefficient allowed by the regulation should be reduced a bit. I wonder when such a regulation will be made in the regulation. In practice, it will not be easy to provide the condition for the curtains (in terms of architecture). In soft storey structures, the engineer should focus on rigid design... ductility should be in the second plan. The aim here is to reduce lateral displacements. By the way, I would like to state that I find your approach to housing and workplaces regarding the value of liquid very useful. In other words, at least (if the white values are not to be entered manually), it would be a very appropriate approach not to mark this option in buildings with workplaces on the ground floor. Good work... KEMAL YALVAÇ
 
I also agree with your opinions. We all observed the behavior of the buildings after the earthquake on the soft floors. We all know that it is not possible, so we will take the necessary precautions. Elements with low translational rate will set up the system. As all of you said, these are curtains, as Kemal Bey said, rigidity should be at the forefront in structures with soft floors. respects
 
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