Seismic Performance Research Of Latticed Shell Structure With Self-Balanced Pre-stressed Units

Latticed shell structures are a type of space grid structure, which has inherent properties of the pole structure and thin shell structure, with the virtue of large span, forcing reasonably, light dead weight, can provide all kinds of beautiful shape, and has become the most promising type of spatial structure in the future. This kind of spatial structures is large public places that always have many people or expensive equipments. Once the structures collapses, a large mount of casualty and financial losing will happen. Great earthquakes have been papered in our country frequently. Seismic response analysis of the large-span spatial structures is more important than the ordinary buildings.This paper use latticed shell with the span of one hundred meters for prototype, using the method of finite element numerical analysis to the seismic performance carried out relevant research work.First of all, the static mechanical properties of latticed shell structure model are analyzed, and the analysis work including latticed shell structure design optimization, analysis the bar deformation and internal force under the condition of each project, structure stability analysis and so on.On the basis of structural static analysis, studied structural natural vibration characteristics use the basic theory of structural dynamic analysis and calculation method. Integrated the calculation results of structure model and the vibration shape features of structure give the vibration natural frequency of the structure, discussed the influences to structural natural vibration characteristics with change of engineering specifications to prestressed, bar section and equivalent mass.On condition that initial form and prestessed are determined. Considering the presttess effect, geometric and material nonlinearity, time history analysis is introduced to research the seismic reaction of latticed shell structures under frequent earthquake and rare earthquake. Through comparing the seismic reaction of system in different excition and earthquake intensity the failure mechanisms of latticed shell under strong earthquake is presented. Research results showed that the latticed shell structures of we study can resist the octave above seismic action under the condition of general site.