Analysis Of Vibration Reduction Of Space Truss Structures With Viscous Dampers

Space truss structure has characteristics of great rigidity, light dead weight, magnificent structure, and good synthetic technology index. It is one of the main large span structural styles. In recent years scholars at home and abroad made systematic research on structure vibration control which has been applied for tall buildings or high-rise buildings. However study on vibration control method applying for long-span space truss structures is few. In this paper research is applied to vibration energy dissipation method using for long-span space truss with respect to vibration energy dissipation calculation model and method, modal analysis, structure dynamic property, arranging energy dissipation mechanism, damping coefficient optimization and .Space truss structure uses viscous fluid dampers to reduce earthquake response. Working behavior of viscous dampers is nonlinear characteristic, but normal structures are in elastic stage, so dynamic analysis for space truss structure with viscous damper is partial nonlinear problem. The paper uses Fast Nonlinear Analysis to solve problems which is suitable for local nonlinear problems. The method is mentioned above is more effective and pricise.A study on the model of the interaction of space truss with supporing substructure is carried out by finite element software SAP2000. This model accords with actual working conditions of space struss structure. Three-dimensional finie element method is used as the calculating model for space truss. The space beam-column method is used as the calculating model for suppoting substructure. A damping unit is used as the calculating model for the additional damper. The modal analysis of normal structure indicates that the dynamic characteristic of space truss structure is complex, and the vibration mode of the model is mainly vertical and horizontal. The effect of restoration is little.By considering five different setting manners of viscous dampers, analysis of damping effect is carried out in the paper. The results indicate that the damper should be set at the place with the larger relative displacement and velocity. In this condition, the damper can get bigger damping force, and play a larger role in energy dissipation.By considering different damping coefficient and number of viscous damper and different seismic wave, analysis of damping effect is carried out in the paper too. The result indicates that the damping coefficient and number of damper have optimal values. That offers a good reference for engineering designers. The structures' responses maybe have larger difference under different seismic waves. In order to get more accurate results, using many seismic waves to calculate and taking their average are necessary.