The Simulation Method Research Of The Load-transfer Mechanism And Catastrophic Behavior Of Large-span Steel Structure Bearing

Large-span space structure is recognized by many architects in practical engineeringapplications, because of its reasonable force, seismic performance, beautiful shape, highdegree of mechanization and so on. So, it is more widely used in the convention andexhibition centers, stadiums, industrial plants and other buildings. Large-span space structuresalso marks the level of a national’s building technology development.The bearing is an important component for connecting the upper and lower structure,while it is also considered to be a weak point in the structural members, and its damaged islikely to affect the safety of the whole structure directly. Therefore, it has very importanttheoretical significance and engineering value to research the large-span steel structurebearing’s load-transfer mechanism and catastrophic behavior.The forms of the bearing and its development course are introduced in the article. Bytaking the stadiums of Xi’an University of Architecture and Technology for example, and withthe analysis software of the ANSYS finite element, the calculation model is established, thebearing’s force performance is analyzed detailly. At the same time, the whole structure’sstability and the seismic response are simulated when the bearing becomes invalid, and themain conclusions are as follows:1. The bearing can meet the design requirements when it is in the normal use of the loads.The key region of the bearing appears in the comb plate of the inner bore and the contactregions with the pin, and it is easy to form the stress concentration in this area, the same asthat when the area appears in the pin at the ear cap.To put the bearing design into practice,these parts should be taken more attention.2. By taking the eigenvalue buckling analysis, nonlinear analysis, and the initial flawsimpacting on the stability of the overall structure when the bearing becomes invalid in sixconditions, the result is that the middle three-bay steel frame bearing’s failure of the span steel structure has the greatest impact on the whole structure’s stability, and the initial flaws willreduce the carrying capacity of the structure.3. By analyzing the vibration characteristics of the structure when the bearing becomesinvalid, and the catastrophe behavior with the time analysis and the modal response spectrummethod when the bearing fails under the action of multi-earthquake, some research results ofmore practical engineering value such as the bearing has the maximum force in the Xdirection and so on can be got.