Research For Vibration Control Of High-rise Steel Structure Using Sma Cables

With the height of high-rise steel structures increasing, the response of the structures subjected to seismic excitation increases remarkably, therefore, the study about vibration control of high-rise steel structures is very necessary. Shape Memory Alloys (SMA) are functional materials with special characteristics such as shape memory effect, hyperelasticity. Because of these characteristics, SMA has been one of the most important materials for sensors and actuators and played a more and more important role in structural vibration control.In this thesis, using hyperelasticity of SMA, the seismic responses of high-rise steel structure installed SMA cable was controlled, and the SMA cable's optimized setting method was brings forward. This is significant in theory and engineering practice. The key developments and creative achievements in this thesis are displayed as follows:(1) Based on the specific characteristics of SMA and the theory of vibration control, the design plan which use the SMA cables to decrease the structure response were put forward.(2) According to the Brinson constitution model and the thermodynamic equations, the kinetics equations of the high-rise steel structure installed the SMA cables were deduced. And the vibration control equation and method of numerical analysis were established based on the finite element theory and the super elasticity of SMA material.(3) An engineering example of high-rise structure installed SMA cables was established, and the effectivity and adaptability of the SMA cables on the vibration control were proved. The time-history analysis for the seismic responses of the example with the SMA cables is completed by using SAP2000. With this example, the effects of the passive control system using SMA cables and its influencing factors on the vibration control of high-rise steel structure are researched to give a theoretical basis for the engineering application.The analysis indicates that the effect of SMA cable on vibration control is superior to the other conventional cables; when dynamic properties and the initial state of cables of structure are the same, the control effect of the SMA cable is more prominent with the higher earthquake intensity; and the arrangement of cables affects the effect on vibration control.