The center of rigidity is far from the center of mass

M

mervecihan

New Member
I have just started using the idecad steel program. In the attached project, the center of rigidity occurs in a very different place from the center of mass, I think it is due to an error in the data entry. Can you check? I will also have a few questions: 1) Do we need to enter the wind loads one by one for each floor in the analysis settings because when I mark the tower type, I cannot see wx wy in the loadings 2) Even though I enter the building importance factor 0, I see earthquake loadings in combinations, this means that the design results are made with earthquake loadings. If so, how can I cancel it? 3) The 48.3x3 profiles I chose are not sufficient even for the beams on the top floor. In the calculations I made in sap2000, they saved even columns up to 28 m high (under the same loads). Thank you from now.
 
Hello there ; Since you enter the building importance factor as 0, the center of rigidity is not calculated due to the fact that there is no horizontal load on the structure. Therefore, you can see it as not coinciding with the center of mass. However, since earthquake calculations are not made for scaffold structures, the location of the center of stiffness does not affect your calculations. You will not encounter such a situation in buildings where earthquakes are affected. The necessary calculations are made correctly and you can check them in the program. 1- If you enter the wind loads in the project, the program is effective in accordance with TS 498 and takes place in combinations. However, if you do not define a skin in your project, there are 2 ways. a) You can enter the wind loads obtained from the calculations as a uniform spring load on your beams on the facade. In this case, you must add the wind load to the combinations under the static analysis from the building tree for wind loads. b) You can enter the wind loads you have calculated on the node points. 2- When the building importance factor is entered as 0, the earthquake loads included in the combination are 0. You only see the combination name in the reports. If you look at the shear force and moment results for EX and EY loads in the frame results for control, you can see that it is 0. 3- Does the model you entered in Sap2000 and IdeCAD match exactly? Your element freedoms, loadings, material properties need to be checked. You have selected the double direction in the load section of the floors you entered. You may be transferring loads in one direction in Sap2000. In iDECAD, you can set the load transfer in one direction or two directions in the slab loads section. Good work.
 
Hello there; To give general information apart from your questions, IdeCAD conducts detailed studies on rapid modeling, reporting and drawings of scaffolding structures. When these studies are completed, you will be able to produce faster and more trouble-free solutions for modeling scaffolding and creating necessary documents. Detailed studies are also carried out regarding wind loads. With the addition of the open structure method in ASCE 7-10, a more comprehensive and detailed wind calculation will be possible. Good work.
 
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