irregularities

[eissenhover]

Hello everyone, as an earthquake load calculation method in idecad; *** Horizontal story forces calculated by combining mode contributions (Improved equivalent earthquake load method) ***Combination of mode contributions (mode combining method) is available from the element-specific results. 1) When we analyze according to the mode combining method, it is said that "A1 and B2 irregularities are not important (TDY 2.3.2.1)". We don't need to check A1 and B2 when the solution is made with the mode combination method, does it mean that we should not take it into account even if A1 and B2 irregularities occur in the structure, *****Relative translation-second-order effects-A2-A3-B1-B3-overturning? I think it's enough to look at the **** controls. As you know in programs such as sap2000, these controls cannot be made by the program, excel etc. We are doing it in environments, so I guess there is no need to check A1 and B2 for nothing? 2) The weight of the building we designed in İdecad is the value given as the free mass of the building in the report. If this is the value, does this value include fixed loads such as concrete-iron-pavements-wall loads, and also the loads that you define manually (for example, a point load defined on the floor) within this weight? 3) My last question is, for example, we made an analysis with the mod combination method and let's say 54 mods were output. Of course, the period value is different for each mode. What value should we take from the report as the period of the structure?

 

[eissenhover]

Can anyone with information on the subject help please, thank you very much in advance for your valuable answers.

 

[HakanŞahin]

Hello everyone, as earthquake load calculation method in idecad; *** Horizontal story forces calculated by combining mode contributions (Enhanced equivalent earthquake load method) *** Combining mode contributions from element-specific results ( 1) When we analyze according to the mode combining method, it is said that "A1 and B2 irregularities do not matter (TDY 2.3.2.1)". When the solution is made with the mode combining method, we do not need to check A1 and B2, if A1 and B2 irregularities appear in the structure Does it mean that we shouldn't even take it into account, I think it's enough to look at the *****Relative translation-second-order effects-A2-A3-B1-B3-overturn**** controls. As you know in programs like sap2000, these controls cannot be done programmatically, We are doing it in excel etc., in this case I don't think there is any need to check A1 and B2 for nothing? we don't need a mother. These irregularities are the irregularities that determine the calculation method.

2) The weight of the building we designed in İdecad is the value given as the free mass of the building in the report. If this is the value, does this value include fixed loads such as concrete-iron-coatings-wall loads, and also the loads that you define manually (for example, a point load defined for the floor) in this weight?

2. The "structure" given in the report free mass" is the mass based on dynamic analysis, whose motion is applied load participation coefficient. This value includes fixed loads such as concrete-iron-coatings-wall load, as well as manually defined loads (for example, a point load defined for the floor) within this weight. Since it is a free mass, half of the top-of-foundation columns (all of the superstructure-foundation interaction solution), foundation and, if any, rigid basement loads are not included. If the movement you want to see is the total weight of the building without load participation coefficient, you can find it by adding the G and Q values in the floor parameters.

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3) My last question is, for example, we did an analysis with mod merging method and Let's say there are 54 mods. Of course, the period value is different for each mode. What value should we take from the report as the period of the structure?

3. If the analysis is made with ritz vectors, the 1st mode in ritz vectors is the mode with the highest mass participation, it is sorted according to the mass participation, the most effective mode is the most effective mode. mode. If the analysis is done with Eigen modes, the period values are ordered from the largest to the smallest.

 

[eissenhover]

Thank you for your valuable answers Mr.

 

[rsb mühendislik]

Hello Mr. Hakan, In most of the projects I have done in V10.17 version, the free mass of the structure is more than the total weight of the structure. According to the comments on the forum, it should not be too much. Can you review the attached sample project?

 

[Levent Özpak]

Hello Mr.Hakan, In most of the projects I made in version V10.17, the free mass of the structure is higher than the total weight of the building. According to the explanations in the forum, it should not be too much. Can you review the attached sample project?

Hello, The total weight of the structure and the free mass of the structure are calculated by 2 different methods.The first is calculated with geometric formulas based on the information of floor areas, column sections, beam sections and loads.This weight is used for the equivalent earthquake calculation.The second is the distribution of the scattered joint mass in the established 3D analysis model. It is calculated with the sum of the total. This situation may sometimes occur, especially due to differences in the project such as eccentricities, axle acceptances, etc. This situation does not constitute an error or negativity. The important thing is the participation rate of the masses that enter the dynamic analysis and are actually scattered. Good work