Research On Seismic Response Of Frame Structure System Under Passive Control

Frame structure is a kind of common structure and has good structural performance. Good performance space is widely promoted. Passive control is a relatively mature control technology and has received great attention. Base isolation and Frame structure to work together to form a new type of anti-seismic structure that has got good promotion in actual engineering.In this paper,taking a six-storey based-isolated structure for reinforced example,use SAP2000 to establish two models:anti-seismic structure and isolation structure system which using a rubber mat. Study the seismic performance of framework with rubber mat.The work mainly include several aspects:(1)Study the feature of vibration periods and formation of the model,which through SAP2000 to do modal analysis of the model. (2) This paper aims at obtain the seismic performance of isolated structure,by using time history analysis to compare and analysis the seismic performance of the structure of the two models in many frequent earthquake or the rare occurrence earthquake. (3)Through SAP2000 to establish two models that include isolation mat aging and isolation mat non-aging, a simulation analysis of two kinds of vibration isolation system, studies of the seismic performance of the isolation mat aging. (4) Research the problem of isolated structure overturn.The main conclusions are as follows:(1) The first natural cycle of the modal analysis is 0.76s for the non-isolated structure and the first natural cycle of 2.18s for the isolation structure that natural cycle got longer.(2) In the time history analysis under the constant earthquake, the top interlayer displacement is 5.27mm for the non-isolated structure and the top interlayer displacement is 1.32mm for the isolated structure; interlayer acceleration is 204.80gal for the non-isolated structure and interlayer acceleration is 60.02gal for the isolated structure; interlaminar shear is 1317.42KN for the non-isolated structure, and interlaminar shear is 511.69KN for the isolation structure; interlayer displacement、interlayer acceleration、interlaminar shear are decreased. Structure present a similar conclusion under severe earthquake.(3) In the time history analysis under the constant earthquake, the top layer displacement is 1.32mm for the isolation structure of bearing no aging; when the horizontal stiffness increased, average value of the top layer displacement of is 1.35 mm, the top layer displacement has increased. When the horizontal stiffness decreased, average value of the top layer displacement of is 1.31 mm, the top layer displacement has decreased. When the horizontal stiffness increased, interlayer top acceleration has increased. Isolation of bearing aging had certain influence on seismic performance Isolation bearing should be timely replacement. Structure present a similar conclusion under severe earthquake.(4) Control structure exist two main problems:The first is to ensure that the isolation layer has good mechanical properties; The second is the main structure of the limit ratio.