I'm fairly new to using SimulationXpress so I need some help. I want to analyze the tube frame shown in the picture. The loads will be applied to the top tube and the lower tubes will be sitting on the ground. How do I model this part so that it will allow the lower tubes to spread apart creating tension in the lower members? I am running Solidworks 2010 profesional with SimulationXpress. Any help or suggestions would be appreciated.