Numerical model and experimental tests on single-layer latticed domes with semi-rigid joints

Geometric non-linearities in single-layer domes can cause the loss of global stability, which is strongly influenced by both geometric parameters and joint rigidity. The rigidity of the joint requires deeper study, since it significantly affects the behaviour of these structures. To this end, a model is proposed for the ORTZ joint. The model is established from the dimensions and properties of the different elements of which the joint is composed and considers the possibility of the material reaching its yield point. After experimental verification, the model is implemented in a computer application. Finally, experimental tests have been conducted on two structures possessing very different features related to geometry and rigidity of joints. In both cases the proposed model has given a good estimation of the experimentally observed behaviour of the structures.