On the static properties and stability of 800 m long-span mega-latticed suspension structures

In order to develop super long-span structures, the characteristics of suspension bridges are considered for use in suspended hybrid structures, initially considering a structure with a span of 800 m. The control parameters for the geometrical shape of the structure are given, and a structural model is established using ANSYS. The initial form of the main cable is studied and a feasible pylon scheme is designed. Static, stability and parameter analysis of the structure are conducted, and progressive collapse analysis after the breakage of the sling is undertaken. The results show that both wind loads and temperature have significant effects on the structure. There is not a destabilization problem exist in the structure and stiffness should be taken as the main consideration. The influence of geometrical parameters on the mechanical properties of the structure is studied, and variation rules for the parameters are summarized. The rise-span ratio of has a great influence on structural performance. When it changes from 1/10 to 1/5, the displacement decreases by 43%, the steel consumption reduces by 8.86%, and the stress decreases by about 10.69%. The possible progressive collapse of the structure following the failure of a single sling is examined. Using transient dynamic analysis. The time history curves of the responses to the process of the breakage of the sling are given. The work shows that it should be possible to develop suspended mega-latticed structures with spans of 800 m.