Photo's of 1:50 model

Finished pavilion model

Below are some pictures of the model that I made to check on the theory that the diagonals could be tensile elements. From the model, although it's not super accurate, I can tell that the combination of "stiff" joints and the tensile elements could work very well. Next I will have to check if the resulting deformations are not too large.


Front view


Side view


Inside view

Below are some pictures of the building process


First part - work in progress


Second part - Work in progress


Impression of the model

Final results

After the first model more models were made and calculated. After a few fails the following model was baked:


Elevations and plans of model 2

The model was imported into DIANA and given material and physical properties. The differences between the models is the diameter used for the main parts.
Model 2.2
The diameters are 0.1 meter for the edges and the middle arc and 0.05 for the other straights. The crosses in each diamond are strips of 0.02 x 0.05 meters.
Model 2.3
The diameters have increased to 0.16 and 0.08 meters.
Model 2.4
Same diameters as Model 2.3 with the addition that the crosses now also have a diameter of 0.08.
For details I recommend the report.
Below are the results:


Model 2.2


Model 2.3


Model 2.4


Conclusion

The bamboo pavilion design concentrates the forces in the middle, because the hypar is cut and mirrored. The pavilion also bends asymmetrical under the load, because the pavilion has a wide and a narrow side. At the wide side a higher force concentrates at the arc then at the narrow side. The result is a higher stress.
The pavilion was tested at the largest configuration. Even with the largest possible diameters the compression stress is to high (> 100 N/mm2). The tension stresses are within the limits, with the set Cross as strip or as pipe; pipe has a higher section area and can therefore take more force.
The load on the pavilion should be limited to a maximum of 700 N/m2. Higher loads are not likely.
The stresses in the crosses in each diamond are both tension and compression. Because of the design concentrations can happen where there is two compressive forces or two tensional forces.
Not all the goals of this research have been reached. In this configuration of parameters the pavilion cannot be build with bamboo. The compressive stresses are too high. The pavilion cannot be build with only tensile elements in each diamond. Concentration of compressive forces can occur. The size of the pavilion has not been determined yet. The size of the load has been determined and should not exceed 700N/m2.