In the present study, the stability of single-layer barrel vault space structures with three-way triangular configuration is investigated by carrying out nonlinear collapse analysis using finite element method. The effects of different parameters, such as initial geometric imperfections, load on a single node, loads on some nodes, unsymmetrical load distribution with different intensities, length to span ratio, height to span ratio, boundary conditions and material yield stress are investigated on the stability of single-layer barrel vaults. The results of analysis indicate that the geometry, initial geometric imperfections, type of loading, unsymmetrical load distribution, boundary conditions and material yield stress have considerable effect on the type of collapse mechanism, load carrying capacity and structural stiffness of studied systems.
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