Influence of considering substructures on seismic performances of suspen-dome structure

In order to investigate the influence of substructures on the seismic performance of the suspen-dome structure, taking the suspen-dome roof structure of the Lanzhou Olympic sports centre complex as the prototype, a method that replaces complex concrete substructures of the prototype structure with steel substructures in shaking table tests was proposed and a scale model considering substructures was established. First, the natural frequencies of the test model were compared with the modal analysis results of the prototype structure considering the scale ratio. Then, an integral numerical model considering substructures was established using Abaqus – the results of modal analysis and dynamic time history analysis were compared with the test results. Finally, two simplified numerical models with boundary conditions of fixed bearings and three-directional hinged bearings were established. The seismic performances of simplified models and the integral model were compared. It is observed that the method of considering complex concrete substructures of the prototype structure in the shaking table test is accurate and effective. In addition, the numerical model and the modelling method are correct. Moreover, the substructure has a significant impact on the seismic performance of the suspen-dome. The substructure should be considered in the analysis and design stages.