Relative floor drift high

mahir58

mahir58

New Member
Hello there. I have attached the steel project of a building that will be a health center. I am getting the relative floor offset high error. I enlarged the sections but could not solve the problem. I used IPE profiles for columns and beams. They want the columns to stay within the wall. I'll be happy if you can help me. Good work..
 
Re: RELATIVE FLOOR DIFFERENCE IS HIGH! Hello; First, decide on your carrier system type. If you are going to use a frame that transmits moment in both directions, you cannot use single-slip plate joints that connect to the weak axis of the columns. Here you need to enter a bolted joint with a title plate. In this way, it transfers torque in both directions. Or you should use vertical braces where the columns have weak axes. At the same time, all your columns are working in the same direction, change the strength of some of them. This way the structure is strong in one direction. At the same time, it is not appropriate to use the column sections as rope. Go through the HEB profiles. Your sections are not enough anyway, so it is not possible for the relative to save. Make the changes I mentioned above and then upgrade the profiles. First, the steel elements must be sufficient, then you control the relative floor offset.
 
Re: RELATIVE FLOOR DIFFERENCE IS HIGH! Thank you very much for your answers. I was told that this structure was solved in another program this way. This way there was no problem. We can't save it in another program and not solve it in the idea, can we?
 
Re: RELATIVE FLOOR SHIFT IS HIGH! If you correct your faulty model with ideCAD, it will also save you with ideCAD. In addition, when comparing two programs, it is necessary to check whether the exact parameters are the same, the design regulation is the same and the extent to which the earthquake code has been applied. If you request other program data and send it to us, you can compare. We will help you where you get stuck in comparing the two models. However, a solution was probably made with an old regulation in the other program.
 
Re: RELATIVE FLOOR DIFFERENCE IS HIGH! Hello; Nurgül has outlined your mistakes in your project, but if you need to elaborate on the subject: 1- All your column-beam connections are hinged, although the load-bearing system type moment transferring frame is selected. You can achieve this situation by using the links described by Ms. Nurgül. If you are only going to make an account, do not describe any connections. 2- All of your column supports are articulated. If you want to solve the system without using cross, your support connection should be the moment transferring connection. You can achieve this by selecting the placement of the bolts in the program to be outside the column. If you are only going to make an account, do not describe any connections. 3- Some of your steel columns seem to be supported on reinforced concrete columns in the basement, some on reinforced concrete walls that are narrower than steel columns, and some on the floor. To fix it, define reinforced concrete columns that are sized to fit your plates under all your steel columns. 4- IPE sections generally have S275 material quality, check your material quality. 5- Check that the load and geometric criteria are 100% the same as the model that you say solved in the other program. 6- Make sure that the relative floor drift controls are made in the other program, and if they are, make sure that they are made according to TBDY2018. Because your current model provides the relative floor drift conditions according to the 2007 regulation after the regulations. It would not be right to comment without examining the model in the other program, but I agree with Nurgül's suggestions for your model. In our own projects, we achieve the same results at levels close to 100% in the controls we perform with Sap2000. Therefore, if both models are created with the same geometric dimensions and analysis options, there should be no difference. The error generally made in this regard is that the models are not 100% the same and the same analysis options are not used. When the model you sent is analyzed, as you can see, your relative storey drifts are in abnormal values. After all column beam connections are deleted and column supports are fixed, your relative storey drift values seem reasonable. After the Column-Beam connection and the support connection are arranged, almost all of the cross-section deficiencies in your model are eliminated. You can also see the sample links in the screenshot: Best regards.
 
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