Vertical Isolation Of Subway Surrounding Buildings

To alleviate the global warming and traffic jams,the MTR has developed rapidly because of its environmental protection,fast,comfort,safety and efficiency.However,subway is through the city center and traffic density gets higher and higher,its operationinduced vibration has a significant impact on the safety of buildings and people lives.Based on the study of the damping buildings around subway,use the disc spring vibration isolator to reduce the vibration of a frame structure.Through modal and time history analysis,get the vibration characteristic table and compare the vertical acceleration and interlayer displacement before and after vibration isolation,the vibration isolation effect is verified.The main results are as follows:1)Summarize existing research,discuss the mechanism and propagation law of vibration,response of buildings and vibration reduction measures.Understand the disc springs characteristics,and design different combinations of vibration isolation bearings.2)Based on ADINA,the soil model is established.Analyze the influence of different clay layers on the vibration and the propagation rule in soil.Results show that the higher the elastic modulus,the smaller the peak acceleration,the faster the attenuation,and the shorter the high-intensity vibration duration.In the clay layer with smaller elastic modulus,the acceleration amplitude is larger and the vibration attenuation is slower.3)Use SAP2000 to build a frame structure model,analyze the influence of vibration wave when the elastic modulus of clay layer is 20 Mpa by using the whole input method.The results show that the vibration is stronger in the bottom and top of the frame,the middle floor is weak,and the vibration response of buildings is mainly from 2~15 Hz,the higher the floor is,the more obvious is the influence of low frequency vibration.4)Establish two frame models with and without isolation bearing.Through analysis,conclude that the disc spring vibration bearing can prolong the period of the upper structure and reduce the vertical acceleration,and the vertical vibration isolation efficiency can reach 51.23% ~ 93.81%,and after that,the floor level change is gentle.