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Turkish When we calculate using the ide static modal analysis method; Let's say that as a result of modal analysis, the base shear force is Vt=1500 tons. According to the equivalent earthquake load method, the base shear force is Vt: 2250 tons. In the design results, while V2=300 tons in Ex loading, V2=450 tons in Ex1 loading Question 1 -- we can see that it increases it for internal forces, but where can we see it increases for displacements Question 2-- it uses my increased loads while doing the basic calculation. Can I see it? Question 3-- When we look at the floor forces in the report section, it publishes the unincreased loads and then calculates the tipping. Wouldn't it be more appropriate to make the tipping calculation according to the increased loads.
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capital analysis
- Thread starter aet
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HakanŞahin
Administrator
Hello, 1. Displacements are increased but not printed as a report. 2. The global end forces calculated from the floor shear forces are applied to the foundation calculation. 3. In TDY 2.8.5, it is written that the tip forces and displacement sizes will be increased. The rollover calculation is an evaluation related to the floor shear forces and the height of the building. The floor forces are used as a basis in the program calculation and the comparison is already made with the safety parameter in the overturn calculation... My personal opinion; You don't need to write.
Hello, Mr. Hakan, Let's consider a building with a height of less than 40m, torsional irregularity coefficient less than 2, no B2 irregularities. I can solve this building according to the equivalent earthquake load method. The base shear force I calculated from the equivalent earthquake load is V=2000 tons, and as a result of the modal analysis, the amplification factor is V=1700 tons. If I solve the building according to the equivalent earthquake load; I will design the foundations according to the base shear force of V=2000 tons. If I solve it according to the modal analysis, according to the base shear force of V=1700 tons..... Wouldn't it be appropriate to apply the modal amplification factor in the foundation design....
HakanŞahin
Administrator
Hello, In the relevant article, it is written that the calculation tip forces and displacement sizes will be increased. In other words, the effects to be used in the design are magnified. If we transfer magnified (design) influences to the basis when we do Modal Analysis, we will penalize the foundation. There is no article in TDY stating that the following effects regarding foundations will be taken into account. I don't think it needs magnification. Since this topic may be open to discussion, we are planning to make this item optional for foundations in version 7. Good work...