Semi-active Control And Numerical Simulations On Seismic Responses Of Long-Span Spatial Lattice Structures

The semi-active control and numerical simulations on seismic responses of long-span spatial lattice structures are carried out in this paper.(1) In the paper, the summary of application and open questions on vibration control of long-span spatial lattice structures in recent years are presented.(2)The semi-active control is implemented by replacing the members of the structure with the varied stiffness and damper controller; then the semi-active control law based on energy response is studied; a formula used to calculate the displacement and velocity of the members'joints under earthquake load is developed, considering the influence coming from XYZ three components together; and then a numerical simulation program using the APDL language based on ANSYS is written.(3)The optimal rule is that members whose influence to the structure's basic frequency is most will be replaced by the controller, a program is written according to the rule to calculate the ever member's influence to the structure's basic frequency.(4)At last, with both a double-layer reticulated dome and the roof structure of Laoshan Country Bicycle Stadium as models, the analysis of semi-active vibration control of long-span spatial structures are given, whose result is very effective with a limited number of members are replaced, the conclusion is that the program based on ANSYS further development is effective, quick and perfectly applied for the computerized simulation of the vibration control of the complicated long-span spatial lattice structures, and also the application of general large FEA software in the vibration control of long-span spatial lattice structures is discussed.