Span Space Truss Structure Interaction Analysis

With the prosperity of the country's economy,large-span space grid structure has been widely used in large stadiums,airports,exhibition halls,large-scale song and dance theater,and other industrial projects,the scale and the number of which are expanding.At present,the large span of space grid structure of the theoretical research in domestic has been developed rapidly,but the study is focused on the static and dynamic analysis of roof rack and the supporting structure and there is few theoretical analysis for the interaction of large-span space grid-foundation.Therefor,according to the theoretical basis for interaction at home and abroad,interaction foundation models are analyzed and the analysis methods for interaction analysis largest inter-space structure of large-span space grid structure are advanced.Given the rigid foundation presumption and neglecting interaction,the finite element model of large-span grid superstructure is established.After analysis of its eigenvalue,natural characteristics of grid superstructure are presented which is based on the assumption of rigid foundation; For the model which needn't to be considered about the interaction,use of time-history analysis method is used to do the dynamic analysis of earthquake.Then,the representatives of internal forces of structural components of displacement is obtained and the correlation between the displacement of internal force of structure and the changes of column stiffness.In addition,cross anisotropic body foundation model was used in this article,the finite element computation module was built for the big span space grid structure that there was a consideration about interaction in the system of grid structures -foundation -soil,through the finite element analysis for its dynamic response,the comparisons of dynamic response of model structure between considering interaction are got and the main discrepancies and influencing factors between them are fond out.Adpoted the method of time interval analysis,the dynamic analysis under earthquake that based on the structure interaction are got,by varying the stiffness of cylinder and pile,the elasticity modulus of clay and the relative parameter in the model,and analyzing the variation regularity about internal force and displacement in the structure element in the situation of considering interaction under earthquake,the differences of internal force and morphotropy are got,in the model structure under earthquake between considering interaction and not by using the method of comparative analysis,the main variation regularity are fond out,investigate the mechanism of interaction in grid structures -foundation-soil,the open questions in the commonly used design methods of project are pointed out,and some improving proposals for referring in the design of homogeneous structure are raised.