Constructive, aesthetical and psychological criteria for glass roof design

The application of glazing allows the construction of very transparent roofs. Todetermine a transparent structure the lightness is a measurable factor within thesubjective experience of transparency. At the example of transparent space gridstructures with axial load-bearing glazing the interaction between measureabletransparency, percept transparency and constructive criteria is analyzed. Theconstructive criteria include different parameters as pre-assembling, stability,member length, knot geometry and joint sealing. The measureable transparencycriteria include lightness and transparency values due to contrast investigation andthe percept transparency bases on a psychological study of 325 people assessingfilm sequences of 3D environments