Optimum Design And Analysis Of Large-span Steel Tube Truss Structure

Large-span steel tube structure is applied when the roof of Track and Field Center of Beijing Sport University set up. In this paper, on the basis of this project, theory study and design calculation are both applied, and finite element analysis is used in different aspect, and thus the structural design can be optimized.(1) Set up the finite element model of steel tube truss in different structure scheme, design and analyze steel tube truss structure in different structure scheme and different steel type. Comparing the results, so that the suitable structure scheme and steel type can be determined. Design and analyze truss structure adopting different support method. Compare the stress performance of the truss structure and lower structure to select the suitable attended mode. Too much members confluence at the truss bearing joint and it isn't agree with the standard; joint listed in the Steel Design Criterion. Apply approximate method to calculate the bearing capacity of the joint in the Steel Design Criterion, at the meantime the finite element analysis software ANSYS is used to do the Calculation as the supplement.(2) With calculating the natural vibration frequency and studying the vibration mode of the structure, it can adjust the member allocation and change the material of the exterior-protected construction to improve the partial modal and make the whole structure have a good stiffness. Tianjin wave, El-Centro wave and Taft wave are inputted respectively, and the seismic reaction time integration analysis of the structure is proceeded. The results indicate that the Large-span steel tube structure has a good seismic performance.(3) FFT update harmony superposition method is adopted to simulate the surface point's wind speed time integration of the roof of Track and Field Center of Beijing Sport University, and the wind load time integration acted on the structure is calculated. On the basis of above data, time-integration analysis of the roof structure is realized, and then the wind vibration response and wind vibration coefficient are determined.