Theoretical And Experimental Study On Vibration Reduction Of High Rise Structure With The Sag Damping Cable

Many towering structures such as transmission tower play an important role in the national economy.The towering structure is very easy vibrated under the effect of strong wind and even collapsed because of its large flexibility and low damping which causing great loss to the national economy.The existing damping technology is difficult to suppress the Multi-modal modal vibration of the structure and is also difficult to control the vibration of the tall structure.A damping technology called sag damping cable is invented and studied which can suppress the vibration of high-rise structure well in this paper.the specific research content and achievements include:1 A damping method to suppress the vibration of high-rise structures was put forward with the Sag damping cable.The vertical damping cable is composed of the main cable,the hanger,the reset spring and the damper.The main cable connected with the structure and the cable which driving the dampers to consume the energy.It not only suppress the wide frequency vibration of tall structures,but also achieve good damping effect because of its advantage of Large length and technology of damping.2 The damping dynamics equation for the single mode vibration of a tall building is established with the Lagrange damping equation.The nonlinear factors of sag damping cable is neglected and the dynamic equation is solved analytically at the first and the numerical simulation model is established by the method of Wilson-? with the consideration of nonlinearity.The influence of main cable sag,main cable installation height,damper viscosity coefficient and span ratio on vibration reduction effect is studied with the methods to realize the damping.3 The model test of the vibration damping of the towering structure is carried out and the model tower is used to simulate the vibration of the towering structure.The influence of the main cable sag,the height of the main cable,the viscosity coefficient of the damper and the span ratio on the vibration damping effect are studied.The results of the study show that:the additional modal damping ratio of the vertical damping cable is increased With the decrease of the sag of the main cable,the increase of the installation position of the main cable and the increase of the viscous damping coefficient of the damper and the maximum additional modal damping ratio is 33%.The results of the test coincide with the theoretical analysis.4 The mechanical properties and parameter optimization of eddy current damper are studied in depth.The electrical test device is designed which can measurement the damping force accurately and eliminate the friction and inertia.Under the same number of magnets,the maximum viscous damping coefficient of the damper is obtained by optimizing the size and distance of the magnet and the efficiency of the magnet is improved by the study and the small vibration of the structure causes a great change in the main cable sag.