Analysis Of Sliding Cable Element And Node

Spatial grid structure has become one of the major forms of spatial structure inChina, because of its elegant appearance and excellent performance. In virtue of yearsof research and project practice, pre-stressed steel structure which improves criticalloading capability and stiffness by distributing tensioned cable has been developedinto an exhaustive structure system represented by a cable-supported structure system.Being a critical part of both spatial grid structure and pre-stressed steel structure,cable together with its connected joints plays a crucial role in whatever security orduration for pre-stressed structure. Besides, restraint forms and extents the cable hasbeen restrained imposed by the nodes, that is, whether cables can slide at joints posessignificant influences on load conditions for overall structure and construction ways.It is argued that the tensioned system including sliding cables is a currently-existing orelse potentially-applied form of tensioned system in pre-stressed steel structures andcorrelative construction courses so systematic researches were necessary.Beneath the Lagrange formulation, stiffness matrix of sliding cable element wasre-deduced using virtue work theory through Green strain and PK2 stress in theisoparametric element form. Corresponding mass matrix and expressions of loadvector were derived simultaneously. Furthermore, experience-based approaches to thealgorithms serving to realize the very element in ABAQUS programming andapplicability, display, strategyof debugging were addressed.Tianjin Free Trade Zone business communication, whose suspendome roof ofhall was analyzed from the following respects under all-span and half-span load case:static , nonlinear buckling character and time-history responses under frequentearthquake and rare earthquake region. Both sliding cable element and discontinuouscable element are distributed in models for compare. It shows that whether loop cableslides influence little under all span symmetric load, while cable stress is moreuniform among different cable segment in continuous loop cable model thandiscontinuous one. Seismal response is more significant in continuous loop cablemodel under both frequent earthquake and rare earthquake region.In combination with sliding cable element algorithm, using the information of new type pantadome system, a tension-self-ascending pantadome system structuremodel for a specific bullring was established. Complete ascending process wassimulated. Information such as displacement and stress for each part of it wereanalyzed. It is noticed that the relation of cable tension displacement and structureascending displacement is linear and the latter one magnifies the former one. Venationand regulations of self-ascending structure system were clearly displayed and that thereliability of continuously sliding cable element was testified. Meanwhile, design andanalysis progress of self-ascending pantadome system was carried out.According to the idea of applying cable-strut tensegric system including slidingcable to suspendome, a concept concerning on a realizable cable-strut joint insuspendome through which loop cable can slide freelywas advanced. And its two newproposals forms of joint single-body joint and pressure-plate joint were given.Practicality model joint were designed and produced. Finite element simultaneous andexperiment researches were carried out. The experiment shows that the slidingcable-strut joint can reduce the friction between cable and joint. The loss of prestressin cable can only be about 10% when 4F ring is used. The trend of stress distributionin experiment is similar with FEM analysis.Concept of sliding cable-strut joint was applied in practical projects. Detaileddesigns of joints were devoted. Finite element analysis was used aiming at threetypical cast steel cable-strut joints in Chi Ping Gymnasium suspendome to verify therationalityand securityof nodes design.