The Analysis Of Special Shaped Grid Structure Considering Cooperative Effect And The Effect Of Multi-dimensional Inputs

The exhibition in Qingdao is a landmark of Jinmao wisdom City Project in Qingdao high tech Zone.This paper takes the grid structure of the exhibition as the research object.The cooperative effect of upper grid structure and lower steel frame is analyzed.The effect of multi-dimensional inputs are analyzed with the time history method.The influence of the height of support on the structure is studied particularly.The exhibition in Qingdao is large and complex grid structure with inclined plane.It is a steel construction with a grid roof.In this paper,three models are analyzed by the SAP2000: the first model is only the roof structure.The second model is a whole model with lower steel frame and upper roof structure.The third model is based on the second model,considering the influence of the height of support.The substructure participation or not and the height of support are considered in the analysis.The influences of the support reaction,the structure internal force and the deflection of joints of mid-span and side span,natural vibration characteristics are obtained.The results are compared in order to study the difference between the simplified model,the whole model and the whole model with height of support,provide a practical reference to similar projects.Multi-dimensional seismic responses of the second and the third model structure are analyzed by the SAP2000.In the 6 seismic fortification intensity area,seismic responses of two models structure to one-,two-,and three-dimensional(1D,2D,and 3D)earthquake inputs are analyzed with the time history method.Through comparison,the seismic response of the structure under three dimensional seismic input is researched.And influence of the height of support on the earthquake response of grid structure is analyzed.The research results show that in the 6 seismic fortification intensity area,the combination of earthquake participation has a great impact on the bar,especially upper chords of grid structure.These internal forces have more than half of the members of the internal force without consideration of earthquake participation.Therefore,it is suggested that in the 6 seismic fortification intensity area,combination of earthquake participation should be considered for the spatial structure of important large span and complex shape.After considering the influence of the three-dimensional earthquake input and the height of support,the responses of the structure internal force and nodal displacement are increased.Therefore,it is suggested that when analyzing the internalforce of grid structure,the height of support should be considered.