About risky structures

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mhmt_ali

New Member
It gives the result that the building whose project I am drawing is not considered as a risky structure in the program, whereas I am of the opinion that the condition of the building in its place is not. The risk of a building depends on what the program does. For example, even though I reduced the concrete class and when I took the analysis, it still gives the result that it should not be considered as a risky structure even though it gives an error in all columns. Could you help me about this issue?
 
Hello, Risky Building Analysis in the Program; It is carried out according to the "Principles on Detection of Risky Buildings" published by the Ministry of Environment and Urbanization. Relevant principles and risky building user manual can be accessed from the links below.
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Good work
 
I reviewed your project. When looking at the project on paper, it seems that the column-beam placements meet certain standards. It may seem normal that it is not risky when you calculate within this framework. But the data you enter and the information you use after this point are important. In this context, I need to summarize a few points about the reinforced concrete risky building main unit: 1- One of the most important ones is that we should almost never use the "comprehensive knowledge" level. (even if we have the project) 2- It seems that there is a stirrup tightening in both the columns and the beams. Did you strip the reinforcement from the columns in the building and check the tightening of the column beam stirrup? As I understand from your words, the condition of the building is not good, so it must have such weaknesses. 3- Another important issue; You should also have observed whether there is a corrosion situation in the reinforcements by detecting the reinforcement stripping. In your data, there is no corrosion effect on your current structure. 4- When you examined, did you enter the amount of reinforcement in the elements (existing, not in the project) into the program? I feel that from what you do. You analyzed with the program. You have made a risky structure analysis with this information as if the reinforcements obtained as a result of the analysis are available in the building in question. For this reason, you will enter the values you have determined in the field or values close to these values. How will you do this? First of all, you will identify the reinforcements by stripping the reinforcement, compare the project with the project, if any, and determine a reinforcement realization. You can make a decision by comparing the purchase price of the old project when it was built. If you have your project, you can enter all the equipment there and reduce it with the realization rate. But this is a very difficult and laborious task. More easily, you will have the column beams analyzed by giving the pursantage value you have determined, and you will fix the results of the reinforcement by checking the rebar fixing boxes. You should analyze with these accessories. 5- If you think that there are local problems in some elements as a result of your observations, you can go for stiffness reduction. 6- Another important issue is the closure of stirrups, 90 degrees 135 degrees or a different situation. This affects the condition of the winding reinforcement. 7- Another issue is related to clamping lengths. You can idealize it by making an evaluation of whether the clamping lengths are sufficient or how much is sufficient, and by entering a value between 0-1 in the program. After saying these quickly and briefly, I took the "minimum" from the "comprehensive" level of knowledge in your project and canceled the stirrup tightening (most of the columns seem to have 7 cm stirrup tightening). Even in this way, the structure turned out to be risky. Otherwise, it is not correct to calculate only by reducing the quality of concrete. Take it easy, good work.
 
Thank you very much for the information you have given, I just had a few questions. I would appreciate it if you explain how I can enter the corrosion value and stirrup closure angle in the program. Good work.
 
"mhmt_ali":2g62wyd1" said:
Thank you very much for the information you have given, I just had a few questions. I would appreciate if you explain how I can enter the corrosion value and stirrup closure angle in the program. Good work.
Click to expand...
Reinforcement in Column Properties / Performance Analysis tab You can specify that the stirrup hook is not 135 degrees by unchecking the corrosion value in the "There is a stirrup tightening" line from the corrosion factor tab.
 
Reinforcement corrosion multiplier: It is a ratio used in structural performance analysis. At the rate written in this line, the wear on the reinforcements in existing structures that have been exposed to the corrosion conditions specified in the earthquake regulations can be taken into account in the performance calculation of the structure. The value defined in this line is multiplied by the existing reinforcement areas and the value found as a result of the multiplication is considered as the reinforcement area. NewArea=multiplier*ExistingArea Insufficient clamping length yield stress factor: Used to reduce steel yield stress of elements. The value entered in this line is multiplied by the steel yield value of the element. NewSteelFlowVal=multiplier*CurrentSteelFlowVal
 
Of course, you will not encounter this menu when entering data in column or beam settings. If you click on the properties of any of the columns or beams entered, you will see this menu. I don't know why it was designed that way. Maybe Levent Bey can give an answer to this.
 
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