Theory And Experiment Research On Active Antiselismic Control Of Spatial Reticulated Sheel

With the development of large structures, intelligent materials used in building structures of the active anti-seismic control has become an important research field and the piezoelectric intelligent structures is the focus of current research. Active control is a high technology in current structural vibration control field and a synthesis of many subjects such as structural dynamics, materials science, information control technique, sensing technique, computer science, measuring technique and earthquake engineering. The active control becomes a study hotspot in many fields such as aviations, civil engineering, mechanical engineering and vehicle engineering because of its good control effect and strong adaptability. Active control technology has a better application in some of these fields. So carrying on the study of the active anti-seismic control using piezoelectric materials will bring significance of theory and practicability.Because of the positive piezoelectric effect and inverse piezoelectric effect, piezoelectric materials can be both a sensor and an actuator. Piezoelectric intelligent structure can usually be formed by engineering structures placed piezoelectric active members which are made of piezoelectric materials. Practice shows that piezoelectric intelligent structures have good efficiency and adaptability.In this paper, the active control technology in civil engineering structure seismic control is presented. The model of active control of reticulated shell is established and the active control method of model is given. The characteristics of LQR and LQG control algorithms are analyzed. The LQR algorithm's computer programs which are established by using Matlab software carry on the active control numerical analysis to the reticulated shell under the earthquake action. The results show that the presented control method can effectively reduce the seismic response of the shell model structure and the active control effect is very significant. In general, the seismic displacement response can be reduced about 40%.In order to verify the mentioned active control method's feasibility and effectiveness, a six star dome shell model structure with a span of 1.6 meters and vector height of 0.16 meters is designed and produced. A new kind of piezoelectric active member is developed based on the actuation effect of piezoelectric material. The piezoelectric active members were placed on the reticulated shell model. The active anti-seismic control shaking table experiments of shell model structure set by eight new type of piezoelectric active members are carried out. The results of the experiments illustrate that the piezoelectric active member can efficiently reduce the structural seismic response, and show that it has simple structure, convenient integration, strong self-adaptive ability. Meanwhile, it is a kind of good active control component.