Study And Application Of Shape Memory Alloys (SMA) Dampers In The Earthquake Resistant Of The Structure With Weakness Floor At Bottom

With the development of material science, being a new material, Shape Memory Alloys (SMA) has a good application prospect in structure engineering;its use also offers a new approach for the structural vibration control. Hence, the study on the SMA dampers and the structural vibration control with these dampers has considerable value.The structure with weakness floor at bottom is a kind of commonly used structural type, which is widely used in the commercial buildings for its large room at the bottom and smart convenient function of application. But for the smaller bottom stiffness and the bigger story drift, it's liable to serious damage in the earthquake without special processing method such as seismic control technique which has been shown by a large number of earthquake damage investigations. On the basis of earthquake response characteristics of the structure with weakness floor at bottom, this thesis presents a study and analysis of SMA damper and its application for earthquake resistant and strengthening of the structure with weakness floor at bottom through theoretical analysis, experiment study and computer simulation, referring to the study and application of SMA in structure vibration control.The paper first reviews and summarizes the stressed and earthquake damage feature of the structure with weakness floor at bottom, analyses the reason and treating measure of earthquake damage, and represents the necessity and feasibility of seismic control on this kind of structures;secondly it discusses the main characteristics of structure vibration control with the application of SMA, represents the material property tests and results of one kind of NiTi Austenite Pseudoelasticity SMA wire whose Pseudoelasticity energy dissipation capability is reviewed, and analyzes the influences of strain range value, frequency of loading, cycle index, working temperature and so on;then based on this test, with the constitutional relationship of SMA, a passive energy dissipation damper of tensile compression SMA isdesigned with its theoretical analysis and calculation model, whose hysteretic characteristics > principle of work and energy dissipation capability are researched;At last the designed SMA damper is applied to the structure with weakness floor at bottom and is analyzed in the passive earthquake resistant control to check its control effect and rule. The research shows that it's obvious to decrease the earthquake response of the Structure with weakness floor at bottom with the designed SMA damper and referred method of passive earthquake resistant control in this paper which has considerable value on the earthquake resistant control of the Structure with weakness floor at bottom.