Research On Analysis Of Several Lssues And Application In Lsolation Structure With Large Chassis

Isolation technique is an effective means to reduce the seismic response of structures. However, Isolation technique is mainly applied to the regular low-rise buildings. Recently, Large chassis structure is widely used in public building such as urban complex. The use of isolation technology can better improve the problem of complex internal force distribution brought by vertical irregularity of large chassis structure under horizontal seismic action. Therefore, it is of great value to apply isolation technology to large chassis structure in order to promote the isolation technology and to improve security of large chassis structure. Based on this, this paper focus on the study of some issues and engineering applications of the design in large chassis structure as follows:(1)This paper uses Bouc-Wen model as elastic-plastic restoring force model of the whole structure. Considering the iMPact of the eccentric iMPact of centroid and the just heart, this paper builds a vibration model of large chassis isolation structure, and derives its equation of motion.(2) When the width of divider seam between towers is limited by the building function, it cannot reach the current specification limits. In order to eliminate concerns that there may exists collisions between the towers, this paper sets a large chassis with twin towers in Xinjiang as the background and create three more commonly used isolation scheme. Then it investigates the relative displacement of twin towers layers at closest point, in coMParison of the relative motion of the state program between towers; The result shows that:For more symmetrical twin towers of the big chassis structure, the dynamic characteristics of the tower is similar, and the relative displacement between the twin towers is a small, according to the current specification, the values are more conservative; Furthermore, this paper also studies the influence of asymmetry of the tower to the relative displacement between the nearest points of the same layer in the twin towers. The results show that:the possibility of isolation structure twin towers collision increases as the towers structural asymmetry increases(3) In order to discuss the possible overturning failure model of isolated structure, and base on the two assumptions of Vertical tensile and compressive stiffness isolator is the same or not, this paper takes a twin towers and large chassis isolated structures in XinJiang as the background, and minimum and maximum surface pressure of isolator under great earth as the inspection object. Study the two overturning failure models of isolated structure under different assumptions, and it can be found that overturning failure model brought by the isolator compression failure under great earthquakes is more likely to occur(4) In the areas of larger basic wind pressure, the reducing use of LRB in order to achieve better damping effect of the upper structure may lead to inadequate isolation layer wind carrying capacity. This paper bases on the finite element software Etabs and Abaqus, using a combination of isolation in the form of laminated rubber bearings and wind-resistant support to achieve the goal of three balance:the moderate damping effect of upper tower structure, reasonable isolation layer displacement and isolation layer wind bearing capacity meeting the requirements.(5) Based on the current seismic code, the system summarizes the isolation design elements, design process. This paper provides a isolation design of a isolation engineering of large chassis three towers in Xinjiang, and then analyzes the relevant issues, gives design recommendations.