Abstract:

In order to improve the safety of existing large-span steel grid structure stadiums and gymnasiums, from the three perspectives of foundation, superstructure and enclosure structure, 24 factors influencing layer indexes were constructed, and the safety evaluation index system was weighted by game theory comprehensive subjective and objective weighting method. The importance grade of components was divided by load transfer path analysis, and the critical value of safety grade of different indexes was strictly defined, and the matter-element extension evaluation model was established. Based on the matter-element extension model, the data collection and model application of five existing large-span steel grid structure stadiums were carried out, and the stadium was taken as an example for empirical analysis. The results show that the safety grade of the stadium is grade II under the normal load (working conditions 1, 2), but the safety grade is grade III under the extreme load (working condition 3), and the corrosion and deformation of the components need to be monitored. The agreement rate between the evaluation results of the five existing large-span steel grid structure stadiums model and the on-site inspection results by experts is 91.35%. The research confirms that the model can effectively quantify the structural safety of existing large-span steel grid structure stadiums under complex working conditions.

Key words: existing large span, steel grid structure, stadiums, safety assessment, matter-element extension