Partial Basement Stage Continuous Foundation

[obguner]

In my project there is a partial basement to be made for the shelter. I want to make the foundation of this partial basement a raft foundation and a continuous foundation at the upper level. partial 2nd basement floor I defined a rigid basement floor. The picture I uploaded shows the system. level at -1.83 elevation. At the -1.83 level, 3 kinds of continuous basic definitions cross my mind. In type 1, the stresses are very high. I guess the stress of the S16 column going down to the 2nd basement is not shared by the raft at -4.48 and the continuous foundation at -1.83, and both are calculated with the full load of the column? In the 2nd type I defined a half continuous basis. S13 e to be joined later in the drawing. The purpose of my definition of THIS foundation is to relieve the tension of the continuous foundations attached to S5. The 3rd type (I don't think we should do this) is to separate the continuous foundations from the tier. Which solution is more appropriate in the algorithm of statistics? What are your suggestions for this type of system?

 

[HakanŞahin]

there is a partial basement to be built for shelter in my project. I want to make the foundation of this partial basement a continuous foundation on the raft foundation on the upper level. I have defined a rigid basement floor for the partial 2nd basement floor. The system is shown in the picture I uploaded. level -1.83 At -1.83 elevation, 3 types of continuous foundation definitions cross my mind. In type 1, the stresses are very high. 2. The stress of the S16 column going down to the basement is not shared by the raft at -4.48 and the continuous foundation at -1.83, I guess they are both calculated with the full load of the column? I defined a semi-continuous foundation of type 3. To be combined in S13 later in the drawing. The purpose of defining this foundation is to relieve the tension of the continuous foundations connected to S5. Type 3 (I think it is not necessary to do this) to separate the continuous foundations from the stage. Which solution is more appropriate in the algorithm of statistics? What are your suggestions in such a system?

Hello, the continuous foundation connected to the S16 column, the panels connected to the S16 column directly, the panels connected to the S16 column. se indirectly takes the effects of moment and normal force. If other continuous foundations are connected to the same column at the same level, the forces are shared. The effects of each floor are taken from the relevant floor. Accordingly, whatever the result requires, the stresses will be at those values. The continuous foundations you mentioned are defined without amplification... Therefore, the fact that the soil stresses appear to be large seems to be related to the insufficiency of amplitudes. Instead of connecting the common columns at the level with the continuous foundation, it may be more logical to connect them with a tie beam at the level of the amputation. (Bending moment is not taken into account in tie beams, tension-pressure effects are taken into account) In addition: If you do not have to build a continuous foundation at -1.83 elevation, you can define a raft foundation without beams in both stages and make a superstructure interactive solution. In this case, the superstructure effects will be distributed to the foundation at both levels. If a continuous foundation is to be built at the -1.83 level, you can connect the continuous foundations to the columns that continue to the lower floor and make an interactive solution for the superstructure. When the superstructure interactive solution is made, the foundations at different levels will be affected by their stiffness and the effects of the foundations at the lower level will also be affected.

 

[obguner]

Unfortunately, when I solved the superstructure interactively, there was no significant improvement in soil tension in continuous foundations. At that end of the continuous foundation, which I have connected to the columns continuing to the lower floor, an accumulation occurs in the soil tension. whereas, as you said, the foundations must share the column loads and moments proportional to the stiffness. I think there is a deficiency in the gradual and Raft-Continuous basic solution in the program. I can send the file if you want.

 

[HakanŞahin]

Hello, The program does not have any deficiencies in the gradual and raft-continuous foundation solution... The effects vary according to the capacity of the superstructure-foundation system to make/not move together. It may or may not recover... For a general check on the accuracy of your data entry, attach your project to the message and let's examine it.