Design and calculation of reinforced concrete + steel floor

[Insomia]

Hello friends, can we design and calculate in the İdecad program as reinforced concrete, including the ground floor slab, and steel, including the 1st floor slab? While designing such a structure, it is necessary to define inputs such as R and D coefficients, diaphragm type, ductility level. My most important question is can we solve the floors separately? In other words, if we make the calculation of the upper floor separately and define the shear, normal and moment forces we find from there as the load to the column to which it is attached, can we then calculate the reinforced concrete floor separately according to these loads? How true is this from a static standpoint.

 

[nurgulkaya]

Hello there; - You can model the building at once, analyze and design it together, and get reports and drawings. - We recommend the following in the selection of R and D coefficients and ductility levels. First select R and D for the steel and finalize the design of the steel floor. Get the reports of the steel section. Then save the project as different, choose R and D for reinforced concrete, do not touch the steel structure above and complete the design of the reinforced concrete and get the reports. It was a way above. What is inconvenient in the other way is to select R and D and to analyze and design in one model at once. * The method you suggested is not suitable, why first, the period of the structure will not be the same, because you solved it separately. And the period of the structure is very important in terms of earthquake loads. You will also enter point loads while activating as a load, but this is actually a general construction behavior. Therefore, we do not recommend making separate solutions.

 

[Insomia]

Thanks for your answer. As you said, modeling the structure in one go is a more correct approach. When we look at the R and D coefficients, the same values are taken for both steel and reinforced concrete structures, where the effects of earthquakes are completely covered by frames. It doesn't seem like there's any problem from that aspect. In cases where the R and D coefficients are different, it seems like a more correct approach to take the value with the lowest value to stay on the safe side. Have a nice day.