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3 layers of additional steel to an existing structure!
- Thread starter mahirinci
- Start date
An existing building, 3 floors... A bit thought-provoking, of course. Here, first, it is necessary to look at whether the steel-reinforced concrete connections are possible due to the existing structure, that is, whether the structure is suitable for this in terms of geometry, and secondly, the reaction of the structure to the difference between the steel-reinforced concrete behavior. As a result, there will be serious differences between the behavior of those 3 floors and the behavior of the other floors. Perhaps the easiest way is to simply test whether the existing structure can withstand an extra 3 floors. So, I think, first copy the reinforced concrete system three times and how is your building against the loads that will come with this state? You have to look at it and make a decision accordingly. To me, it's almost 100 percent that it should be retrofit. Then, if the structure is suitable for this strengthening, what kind of reinforcement should be made if it is steel, it is necessary to look at them. It is necessary to examine the feasibility. Obviously a specific issue. I think it would be better to get help from someone who specializes in this subject.
nurgulkaya
New Member
Hello there; In terms of the program, it will not be a problem if you design a reinforced concrete-steel mixed structure. When you build the model that will provide the load transfer between the reinforced concrete and steel elements correctly, you can get the design results without any problems. If we give a little more detail; While modeling a steel structure on a reinforced concrete structure, you should not model any steel carrier element on a reinforced concrete slab, it is not in compliance with the Earthquake Regulation and the program does not allow load transfer. The carrier system of your model is completely reinforced concrete column, steel columns should be placed on the beam and their connections should be made correctly. It would be appropriate for you to pay attention to the points mentioned by Mr. Nedim and to make comments as an engineer or to seek advice from an expert on this subject. It would be appropriate to start with the strengthening analysis of the reinforced concrete structure. After the strengthening analysis, if the building is suitable for reinforcement, you should choose a carrier system that will ensure the least possible load on the reinforced concrete structure from the steel structure. This part of the project is completely related to your engineering studies, independent of the program. Good work.
Hello, It seems possible at first glance to add 3 layers of steel to this structure. However, of course, in the end, as mentioned above, following the analyzes, reinforcement of the existing reinforced concrete structure and on the raft basis (for punching) may occur. First of all, a horizontal load-bearing system including steel columns whose support does not transfer moment and crosses between them can be considered in this region, so that the horizontal rigidity of the elevator and stair core shears will be continued upwards on the floors with the steel carrier system to be added. Since it will be very difficult to detail the supports of the columns, which will require the creation of chemical anchors and shear wedges, on the 20 cm thick wall, and also, it will be very difficult to carry the support tensile forces due to the earthquake load to the chemical anchors, it may be necessary to make a detailing with SPSW (steel plate wall) for this region. Steel columns located around the upper floor shears, which will be steel braced or steel plated, can be created by making chemical anchor detailing so that they do not transfer moment directly over the existing reinforced concrete columns. A steel-concrete composite flooring system should be considered for the floor slabs to be newly added. Since the steel sheared core is located in the middle of the structure, the effects of torsion need to be examined especially, and the precautions to be taken and the details to be made in the transfer of earthquake loads from the floors to the core are of great importance. A steel carrier system that is as light as possible and has a high energy absorption capacity should be constructed. It is possible to implement all these necessary models and analyzes by continuing on the current project with the current version of the ideStatik software, even including the SPSW system with the necessary idealizations. It is very important to carefully consider the relevant articles of the earthquake code for this type of structure (for the selection of the structural system response coefficients, the selection of the ductile level, the stages of applying earthquake loads and examining their effects, etc.). It would be healthy to detail the project after the preliminary evaluations and to continue with a professional service for the implementation afterwards. Best regards, Tolga Aydoner
Thank you for your answers. I started the project. There are a few more points I'm stuck on. 1- I created a frame with steel beams at the junction of two protrusions. however, there was a serious problem due to the deflection of the beams. can i do as i shared in the picture?
nurgulkaya
New Member
Hello there; As you can see from the image, you entered your steel beams in the console area in one piece while on the steel column. Steel elements do not divide where they perceive and contact each other like reinforced concrete elements. You must enter the steel beams in parts. In this case, the deflection may change in your problem. Good work.
Hello there; I think it looks like that in the image, I'm sharing a new image. As can be seen in the image, I entered each of the beams separately from the columns one by one. however, when I put beams in the places I marked, I was having trouble with those beams and the overhang beams around them. can i create tiles there like this? Or do you have any other advice?
nurgulkaya
New Member
Hello there; You can define flooring. You can create flooring by selecting 2 main beams perpendicular to each other in the geometry you created. Good work.