Progressive-Collapse Mechanism of Suspended-Dome Structures Subjected to Sudden Cable Rupture

This article proposes an progressive-collapse mechanism for suspended-dome structures subjected to cable rupture, based on experimental and finite element results. The anti-collapse can be succinctly described as a node-buckling mechanism: the potential node buckling in local arch-like spatial grid centered unsupported directly determines whether progressive collapse will occur overall structure. Subsequently, this mechanism, model is further proposed, factors affecting bearing capacity of suspended domes are quantitatively expressed through construction resistance index, which used judge sensitivity hoop cables. Further, using Ribbed Lamella examples, extensive calculations demonstrate applicability accuracy index other types domes. Finally, analyze two important but easily overlooked that affect Initial geometric imperfections result rise–span ratio too small grid, while lack lateral stiffness at supports weaken axial outermost radial or diagonal members. Both these significantly reduce stability making it more likely trigger structures.