Multiple Rigid Diaphragms

[SonDurak]

Hello there; When I want to analyze with mode combination method, he says, "Rigid diaphragms will not be created in the project, the project response spectrum will be solved with the analysis method." "More than one rigid diaphragm was detected in the basement floor." I couldn't upload it because the project size is big.

 

[admin]

Are there floors in your project that do not form a rigid diaphragm (floor not defined)? That's why your message appears. (Detected more than one rigid diaphragm is another case.). If you have a floor without a rigid diaphragm, the program analyzes with scattered masses and element-based dynamic coupling method, since it is not possible to talk about the combination of floor force and modal floor forces. Both methods are dynamic mode combination methods, in one, the story forces are combined modally with the CQC method, while in the other, the element effects and displacements are combined with the same method, modally separately.

 

[SonDurak]

I defined an extra floor at the top, I guess that warning was caused by it. Currently, analysis can be made with the Mode Combination Method. But; There is a floor discontinuity in the project due to the mezzanine floor, in this case, which analysis method would be better for me to use? A friend from the forum; He said that the response spectrum method would give more accurate results because there is a tiling discontinuity, but in the ide manual; Use response spectrum solution with eccentric moment loading at diaphragm: If this option is checked, dynamic analysis is performed with the calculated response spectrum for each of the elements, storey eccentricities are considered as point moments in case of a separate loading. If the system does not have a rigid diaphragm, you should tick this option. Turkish Earthquake Code (TDY) does not allow systems without rigid diagrams.'' Therefore, when you analyze with this option, TDY conditions will not be controlled by the program.'' What exactly should I understand here? Thanks...

 

[HakanŞahin]

.'' in akat ide user manual; Use response spectrum solution with eccentric moment loading on diaphragm: If this option is checked, dynamic analysis is performed with the calculated response spectrum for each of the elements. It is taken into account as point moment. If there is no rigid diaphragm in the system, you must tick this option. Turkish Earthquake Code (TDY) does not allow systems without rigid diagrams. "Therefore, when you analyze with this option, TDY conditions will not be controlled by the program." ] Hello, This is not the case in the Program In other words, all TDY conditions are checked. That expression in the user manual describes an old situation. We will change it...

There is a floor discontinuity in the project due to the mezzanine floor, in this case, which analysis method would be better for me to use? A friend from the forum; He said that the response spectrum method will give more accurate results because there is a slab discontinuity;

You can analyze using the response spectrum with the semi-rigid diaphragm option.

 

[ilkem]

Hello, In the project I have attached, when I analyze with the option 'create a single rigid diaphragm in the floors', slip safety is not provided on the P01 and P05 curtains. (I'll leave increasing the cross-sections and horizontal body reinforcements for later in order to ensure slip safety.) But when I solve the system with more than one rigid diaphragm, slip safety is provided on the walls in question. Since the stairs separate the two apartments in the project, is it appropriate to make a solution with more than one rigid diaphragm or to create a single rigid diaphragm on the floors and make a solution? I am waiting for the findings and suggestions of the project friends.

 

[Levent Özpak]

Hi, When I analyze with the option 'create a single rigid diaphragm within the floors' in the attached project, slip safety is not provided on the P01 and P05 curtains. But when I solve the system with more than one rigid diaphragm, slip safety is ensured on the curtains in question. Since stairs separate two flats in the project, is it appropriate to make a solution with more than one rigid diaphragm or to create a single rigid diaphragm on the floors and make a solution? I am waiting for the determinations and suggestions of my project colleagues.[ /quote] Hello, -The stair landings on the floor level allow the floor to work with a single rigid diaphragm. Therefore, I think it would be more appropriate to solve the system as a single rigid diaphragm. Floors "Create an automatic rigid diaphragm regardless of the connection" option marked and solved as a single rigid diaphragm solves the shear problem on the curtains. China select all tiles on the corresponding floor. Click the object properties command. In the dialog that opens, in the Static tab mark the line "Automatically create a rigid diaphragm regardless of the connection" and click OK. Note: The level of the floor named Dasn on the 6th floor is wrong. The relevant slab is given a positive level, but the elements to which the slab is connected are not. Good work

 

[ilkem]

Thank you very much, Mr. Levent. Good work.

 

[mühendis1625]

hello, take it easy, I was going to do a performance analysis, but first, it says to do dynamic floor forces loading management, what is this and how

 

[Levent Özpak]

hi, I was going to do a performance analysis, but first, it says, do it with dynamic floor forces loading management, what is this and how is it

Hello, Earthquake Load method in the Analysis Settings / TDY options tab in the projects to be performed performance analysis The option "Apply horizontal loads calculated with the mode combination method to the rigid diaphragm" should be checked and general analysis should be done according to this method.