Seismic Response Analysis Of Frame Structures With Different Isolation Schemes And Engineering Application Research

It is very serious that the loss of people’s lives and property due to the destruction of the building in the earthquake. In order to reduce the loss of earthquake damage, to improve the ability to withstand the earthquake from the aspects of building structure, so that the building as well as engineering facilities and equipment without serious damage during an earthquake, seismic isolation technology is the effective measures to solve the problem.Seismic isolation technology is still in development and promotion, it is a new technology. The base isolation technology is relatively mature, and location of isolation layer on the structure have a certain impact on the isolation effect. The higher the isolation layer, the more complex the force, the worse the effect of isolation, the corresponding costs are also higher; when isolation layer is lower, substructure acceleration response may be significantly enlarged. Now many buildings with basement, it is crucial that reasonably determine the position of isolation layer in seismic isolation design initial stage, and when isolation layer is located in the top of the column of the basement, height of the columns below the isolation layer also have a certain impact on the isolation effect of superstructure, they all need to study.First of all, the paper respectively to carry out conventional design and isolation design to three-story, six-story and ten-story reinforced concrete frame structure with one-story basement in seismic precautionary intensity of Urumqi(8 degrees 0.2g). In the design of isolation, according to different isolation layer position that two kinds of isolation scheme was put forward: basement floor isolation and basement column top isolation. Using ETABS to time history analysis for structure, results show that seismic isolation structure period extension 2 to 4 times, multistory structure period growth rate is greater than high-rise structures, seismic isolation structure inter-laminar shear force, relative storey displacement and floor acceleration were reduced significantly, and under rare earthquake is much better; according to horizontal seismic decrease coefficient and horizontal displacement of isolation layer to get basement capitals isolation seismic reduction effect is better. Secondly, for the six-frame structure, when the use of the basement column top isolation, only changing the column height which below isolation layer, to explore the seismic response of the superstructure while the amount of change in column height of variation 0.5m from 3.0m to 5.0m. The results showed that with increasing of the column height below the isolation layer, and the damping ratio of the inter-laminar shear force, relative storey displacement and floor acceleration of superstructure are declining, the displacement of isolation layer are increasing, horizontal seismic decrease coefficient are increasing, with the column height increased the seismic reduction effect of the superstructure is relatively weaker. For frame structure with basement, it is suggested that the basement as far as possible to reduce the column height in the case of the basement meeting the requirements of criteria and the use of its function when using the basement floor isolation scheme. Finally, according to the design examples of the first middle school canteen in Urumqi isolation, the corresponding analysis results are given, and it proposed some problems that should be paid attention to in the seismic isolation structure, which provide a reference value for promotion and application of seismic isolation technology in the earthquake disaster region.