floor safety issue

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byfrudo

New Member
Hello Friends, First of all, I like your forum very much. I wish you success.. I have a problem. I am doing the renovation project of a building that is under construction. Another engineer friend designed its statics before. I took a power of attorney from him and resolved the current problems. But I ran into a problem. This friend of ours has solved the foundation with beams as a raft foundation. For some reason, even though I use the same values exactly, it always gives me negative ground safety error for the foundations. I reduced the vertical loads of the building compared to the previous state, but it didn't work. Unfortunately, I cannot change the basic dimensions. I am attaching the project. Please this is urgent. I will be grateful if you could help me. So I need your alternative comments.. Best Regards...
 
"byfrudo":1eittkil" said:
Hi Friends, First of all, I like your forum very much. I wish you success.. I have a problem. I am doing a renovation project for a building that is under construction. Another engineer friend designed its statics before. I took a power of attorney from him. I solved the current problems. But I encountered a problem. This friend of ours has solved the foundation as a rafter raft foundation. For some reason, even though I use the same values, it always gives me a negative ground safety error for the foundations. I reduced the vertical loads of the building compared to the previous state, but it didn't work. Unfortunately, I cannot change the basic dimensions. I am sending the project as an attachment. Please, this is urgent. I would appreciate it if you could help. So I need your alternative comments.. Best Regards...
Click to expand...
Hello, You haven't added the project...
 
Hello, First of all, there are data entry rules in the program for raft systems. To explain in general: In the program, there is the possibility to define rafts in two ways as beamed and non-beamed raft. 1.) In the rafter raft, continuous foundations should be connected to the columns in the form of a grid, and a raft slab should be defined between the continuous foundations. 2.) In the raft without beam, the border between the slab edge and the raft must be defined and the raft slab must be defined within the slab edge. Beamed raft and beamless raft systems can be found in the same project, but they should not be connected to each other in mass. Therefore, the basic data entry in your project is not correct... Another issue is; Multi-armed vertical carrier elements in the middle region... Defining these elements as polygon columns is not wrong as a data entry, but since the arms of the polygon column are long, it would be more appropriate to enter them as panel objects and model them as shells. In this way, long rigid arms do not occur in vertical carrier-beam connections, and you also spread the panel-raft foundation connection over a wider area.
 
"HakanŞahin":dt3dand2" said:
Hi, First of all, there are data entry rules in the program for raft systems... To explain in general: In the program, there are two ways to define rafts as beamed and non-beamed rafts. 1.) In rafter raft, continuous foundations should be connected to the columns in the form of a grid, and between continuous foundations, a raft slab should be defined. Therefore, the basic data entry in your project is not correct... Another issue is the multi-armed vertical carrier elements in the middle region... Defining these elements as polygon columns is not wrong as a data entry, but since the arms of the polygon column are long, the panel object It would be more convenient to enter it as a shell and model it as a shell, so that the vertical carrier -k Long rigid arms do not occur in the input connections, and you will also spread the panel-rade foundation connection over a wider area.
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Thank you for your answer. But I could not fully understand the explanation you wrote in the 1st item. The statement "Continuous foundations should be connected to the columns in the form of grids", that is... When I define the columns in the middle as curtains, I get the error that the curtain length cannot be less than 7 times the width for the short arms. How can I make up for the mistake in the first item. I would be very happy if you explain a little more. Best regards...
 
"byfrudo":2xhqrumu" said:
Thank you for your answer. But I did not fully understand the explanation you wrote in item 1. Let me explain the statement "Continuous foundations should be connected to columns as grids", namely...
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Let me explain with an example: Raft with beam : Rad without beam:
"byfrudo":2xhqrumu" said:
When I define the columns in the middle as curtains, I get the error that the curtain length cannot be less than 7 times the width for the short arms. How can I make up for the mistake in the first item. I would be very happy if you explain a little more. Best regards...
Click to expand...
Warnings given in geometry control are not binding. Since the elements you mentioned are part of multi-armed panel elements, you can ignore the warning given by the program. Alternatively, it could be that the short arms are rod-like. In this case, you can also enter them as colons. Like panel-column...
 
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