Bamboo pavilion

Hello, 

I try to build a Bending Gridshell Pavilion out of bamboo like the one of the course "Force Matter II: Calibration" at the School of Architecture CUHK (Chinese University of Hong Kong)

Here is the link to the video of the project: https://www.youtube.com/watch?v=VOFKhLpnIdg

My problem is that my simulation seems to be too much like a tensile structure and not like a bamboo grid. Did anybody know what I need to chance? 

Thanks a lot. 

Alina