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Hi, guys. I am doing researching about freeform structures. And some articles said that double curved is free form, some said both single curved and double curved are free form. What exactly is the definition? And is the Beijing National Stadium as shown in the picture freeform...

Thank you all, guys. According to your replies, I think the two usages you mentioned for the pointy thing are quite reasonable.

Hi guys, can anyone tell me what the pointy thing in the joint of Eden Project does? And the function of the holes around the joint. Many thanks.http://files.engineering.com/getfile.aspx?folder=c507befc-63d6-4c79-a287-12a33435c5cb&file=eden_project5.jpg

IDS-Thank you so much. Sorry for the late reply, there is no email reminding this time. I have managed to conduct displacement control method in several other models. Some of them the master-slave link was used.

IDS-Thank you so much. Here is another question, hope you can help. I want to use displacement control method, how can I do it? I checked the master-slave link in the help, but I didn't really get it.

IDS-Thanks for your reply. The end of the horizontal beam has restraints other than the two vertical beams, the top and bottom of the vertical beams are restrained against rotation and position. And I wanted to plot the displacement of the centre of the horizontal beam vs load factor, how can I...

I increased the load factor and there was a drop. So it seemed that I found the problem. :)

IDS-Thanks. This question was so stupid.[dazed] I get it now. Can I ask another question if it is not bothering you [glasses] The thing is: I tried to delete the stress vs strain table, and then the results turned out to be better (no warnings or notes), so I guess it is okay to delete the...

IDS-Thanks a lot. I freed the restraint of x direction of node 1, then it worked fine. I tried to conduct nonlinear analysis, set the value of force 100 kN, changed the property of beam to the question asked. After reading the examples of help of strand 7, I created a stress vs strain table...

And the horizontal beam has an imperfection in the shape of sinus. In order to simulate this, the beam was replaced by three beam elements.

Almost forgot. The property of the beam is just a random choice from the library.

Also this is the image of the beam.http://files.engineering.com/getfile.aspx?folder=d86f7aa4-069d-4097-929d-5929bc851cbe&file=beam.PNG

IDS- Thank you so much. I attached the strand 7 file. I set the global freedom case as 2D beam. According to your reply, I should not apply the load to the left hand side node that I did now. But then how to apply the...

Hi guys! I have a problem about the beam I am analyzing. I should do a nonlinear analysis, but there are always warnings and all the displacements are zero. So I thought I did a linear static analysis first to see what went wrong. And this warning came, the Node force/moment component at node 1...