Structural modeling
Structural modeling
(OP)
Greetings,
I am seeking opinion on whether it is a good idea to model 2 buildings separated by an expansion joint in one model. Will it truly capture the dynamics of the building?
Assuming one building was weak torsionally and the other was not, would the first mode show the true first modes of each building or would it be the first mode of one of the buildings?
What is the best way to go about modeling such a occurence?
I am seeking opinion on whether it is a good idea to model 2 buildings separated by an expansion joint in one model. Will it truly capture the dynamics of the building?
Assuming one building was weak torsionally and the other was not, would the first mode show the true first modes of each building or would it be the first mode of one of the buildings?
What is the best way to go about modeling such a occurence?






RE: Structural modeling
RE: Structural modeling
RE: Structural modeling
That being said, why not do some experimentation to see what happens? For example, create two vertical sticks side by side with different properties and run the modal analysis. See if the model can come up with the right modes for both of them.
RE: Structural modeling
RE: Structural modeling
We normally model the two together.
RE: Structural modeling
1. Length of the building is about 400 ft. and a notch in the diaphragm. Imagine 2 200'x100' buildings connected by a 50' x 25' bridge.
2. Inflexible locations of lateral system making it better to separate than try to keep together.
I am using ETABS to do the analysis. I will try defining separate diaphragms and see how it works.
In addition, I would appreciate if I could some more responses on my previous question on a related note (thread507-210196: Wind loads for 2 buildings with expansion joint)
RE: Structural modeling
RE: Structural modeling