Dynamic characteristics of century lotus stadium and its response spectrum analysis

Used the program, ANSYS, finite element model of the rung-shape long-span tensile cable-membrane structure in Foshan Century Lotus Stadium was conducted to investigate its dynamic characteristics and its mechanics performance under seismic loading. Results indicate that the natural frequencies of the structure are all lower and concentrate in a small range, and its jumping phenomenon isn´t in evidence. The structure´s vibration is mainly vertical vibration, and its lateral stiffness and torsional rigidity is well. To ensure that the modal mass participating coefficient is not less than 90%, the contribution of the former 140 modes are should to consider when the analysis of response spectrum is done. Because the earthquake action can greatly influence the internal force of the upper compression ring, the lower compression ring, and the truss web, it should be calculated in the load combination. When the earthquake waves load on the structure from different directions, the internal force and displacement of the structure have significant difference. So the effects of the different direction of the waves and their combination should be considered together.