Hi,

For a project, we are developing a timber bending active structure and are trying to modelize it through Kiwi3D.

We are aiming at bringing the timber strips into a bent shape and calculate the stresses implied. From this bent geometry, we will further load the elements using the load history capacity of Kiwi.

I have been trying to achieve a simple geometry totry the methodology based on the papers : _Form-finding bending-active structures with temporary ultra-elastic contraction elements) _ and *Exploring Software Approaches for the Design and Simulation of Bending Active Systems* and this post about bending active with Kiwi.

I am using contracting cables and uplift forces to create the initial geometrical imperfection in order to control the direction of the buckling.

As a result, I get the following bending moments, shear Forces and normal forces. The normal forces look odd but it would seems that the sum of it is actually equal to zero? :

I was wondering if the methodology presented in the definition is the proper way to simulate this behaviour and what should be the criteria for the pre-stress in the cable and for the forces to create the imperfections in order to get a convergence in the calculation?

Bending_Active_Kiwi.gh (35.4 KB)

Thank you for you help!

Guillaume