The Mechanical Property And Seismic Response Study On Rectangular Suspend-dome Structure

Rectangular Suspend-dome structure is a kind of new structure with sigle-layer shell and Initial stress system.The introduction of Initial stress make it overcome the shortcoming of single-layer shell.Compare with Cable dome structure,the Rectangular Suspend-dome structure is a kind of stiffness and internal force self-balancing structure.Because of there are many advantages,Its application prospects are optimistic。Based on this point,this paper focus on understand its mechanical properties.The paper use ANSYS as analysis software,build the model of the structure.the mainly idea are as follows:(1)The static performance of the structure was analyzed in the article at first,understands the internal force distribution rules and conditions of the structural element,finds the main stressed members of the structure through static analysis,and guides the design task to strengthen the relevant parts.By changing the parameters to understand the changing law of the internal force and the node displacement of the structure under different parameters,the parameters can be changed in the design stage to achieve the purpose of controlling the internal force of a specific member or the size of the node displacement.(2)Analyze the dynamic characteristics of the structure to obtain the natural frequency of the structure,and compare it with the frequency of the upper single-layer reticulated shell structure to verify the natural frequency and mode shape of the rectangular string-supported reticulated shell structure.The research shows that the natural frequencies of the two structures have slightly changed.But on the whole,the natural frequency of the dome structure is higher and the stiffness is greater.Then,using the structure’s rise-span ratio,span,and support type as parameters,the influence of the parameters on the dynamic response of the structure is studied after changing the above parameters.(3)The article uses the mode decomposition response spectrum method and the time history analysis method to analyze the seismic response of the structure.The main research content involves two aspects: nodal displacement and internal force of members.According to the regulations of the code,select 7 seismic waves to check the structure under frequent earthquakes,And other three seismic waves are selected under different parameters to analyze the time history of the structure under rare earthquakes to verify the safety of the structure under the action of rare earthquakes.Each seismic wave is input along X,Y,Z and three-dimensional directions.The similarities and differences of the seismic response of the structure in different input directions of different seismic waves are studied,and the change law of the structure time history curve is summarized and the best value of the dynamic response is found as a reference for the design.At the end of the paper,it summarizes the content involved in the research,points out the areas worthy of improvement in the follow-up research,and puts forward the outlook...