Hello!
I am modelling a RC frame with 10 floors.And then I want to define rigid floor in order to compare with our country specification.But I can't find anything about that in help document.So I hope you can provide some suggestions how can I model rigid diaphragm.Thak you every much!
Can the rigid floor be define in seismosoft?
-
seismosoft
- Posts: 1272
- Joined: 06 Jul 2007, 04:55
Re: Can the rigid floor be define in seismosoft?
The possibility of introducing rigid diaphragm constraints is currently not featured in SeismoStruct (though we are working on it). Hence, the solution is for you to introduce horizontal braces (with truss elements).
Seismosoft Support
Seismosoft Support
Re: Can the rigid floor be define in seismosoft?
Thanks for your suggestion very much!
The elastic element is adpoted for brace with a very large elastic modulus when I introduce brace for modelling rigid diapharm.Is this method used to modelling? And then a problem will be considerated.What magnitude is defined by the large elastic modulus according to your experience?
The elastic element is adpoted for brace with a very large elastic modulus when I introduce brace for modelling rigid diapharm.Is this method used to modelling? And then a problem will be considerated.What magnitude is defined by the large elastic modulus according to your experience?
-
seismosoft
- Posts: 1272
- Joined: 06 Jul 2007, 04:55
Re: Can the rigid floor be define in seismosoft?
As we stated above, truss elements, rather than frame ones, should be employed.
And as discussed in the Help System, and in other posts in this Forum, a solver will normally consider elements as infinitely rigid if their stiffness is 100-250 times that of connecting elements.
Seismosoft Support
And as discussed in the Help System, and in other posts in this Forum, a solver will normally consider elements as infinitely rigid if their stiffness is 100-250 times that of connecting elements.
Seismosoft Support
Re: Can the rigid floor be define in seismosoft?
Thanks for seismosoft's help!
In the Help System, I find something about rigid floor that"Modelling a rigid floor diaphragm using pinned crossed struts may give rise to unrealistically high axial forces in floor beams. In order to avoid this, one may think of introducing a coincident elfrm element featuring infinite axial stiffness and connected to link elements that would only transmit axial load. In this way, the very rigid element would absorb the axial load, whilst the rotations (hence moments) would be transmitted to the original beam elements. "
Due to reccomendations above, I have an idea to model rigid floor. That is using link element that is just defined axial stiffness(100-250 times of conneting element)and other DOFs' Ko is 0.001.Then link elements are used to connect two nodes on the cross of floor.
In the Help System, I find something about rigid floor that"Modelling a rigid floor diaphragm using pinned crossed struts may give rise to unrealistically high axial forces in floor beams. In order to avoid this, one may think of introducing a coincident elfrm element featuring infinite axial stiffness and connected to link elements that would only transmit axial load. In this way, the very rigid element would absorb the axial load, whilst the rotations (hence moments) would be transmitted to the original beam elements. "
Due to reccomendations above, I have an idea to model rigid floor. That is using link element that is just defined axial stiffness(100-250 times of conneting element)and other DOFs' Ko is 0.001.Then link elements are used to connect two nodes on the cross of floor.