I am going to model a suspension bridge in SAP2000, which contains two types of cable elements, including the main suspension cable and the suspenders. When I divide the main cable into several parts in order to connect the suspenders to the main cable, it seems the behavior of the cables is totally wrong and the results are not logical. My guess is that SAP2000 is unable to capture the response between the connected cables and it only works when there is a single cable restrained at each both ends. Has anyone ever faced the same issue?
The following is the picture showing the undeformed, deformed shape and axial force of a very simple structure, but the results seems incorrect!
In my opinion you can model the both cable. The problem is the connection between the two cables. Is there any real one?
Indeed when you divide the main cable into several elements to connect the suspenders (similar to the picture that I added) there is no real connection between the cable elements and the axial forces seem not to develop correctly in the cables. Have you modeled suspension cables before?
Farzin Kazemi
I mean the connection should be free for moment and torsion. So the model shows no moment force.
https://www.youtube.com/channel/UCFV4j8TGclSxEdkb6SG8PtA/featured?view_as=subscriber
would you please explain how did you solve the problem?
I have to model a complicated suspension bridge, but I have not found a comprehensive tutorial yet.
when I model even a simple cable structure, the modal analysis does not perform.
I need modal information of the bridge.
Shaahin Bidmeshki the problem can be easily solved in both sap2000 and sap bridge software. I've done it before.
The model is not stable if the main cable is modelled as truss or cable element because there is no retraint dof out of plane of the cables. The main cable should be modelled as frame element or additional restraint applied to the dof in out of plane direction.
The hanger can be modelled as truss or cable element to have a hinged connection at both ends.
In model it can be done, but, is it practically possible to restrain the cable ends?
It is there with example suspension bridge data in ASTRA Pro, available for download from web site www.techsoftglobal.com. ASTRA Pro uses microSAP for analysis which is windows version of original SAP by University of California, Berkley.
I have final year project on designing of suspension bridge and I have the same problem and still looking for its solution
Download ASTRA Pro from Web site www.techsoftglobal.com, Create Project, by default data (Unauthorized version), you can see the modeling, loads, forces etc.
Create analysis data, process analysis, process design, see complete set of sample drawings.
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