Vibration Isolation Design And Experimental Study Of Subway Buildings Based On Thick Laminated Rubber Bearings

Developed in the form of thick laminated rubber isolation bearings,and applied to Shenzhen middle school adjacent to the subway construction of mud,vibration isolation design.The analysis of thick laminated rubber bearing and tests have shown that support the desired performance requirements,the construction of the vibration analysis have shown that the vibration isolation scheme effectively reduced the vibration response of the building meet vibration standard requirements,adjacent to the subway construction affected by the vibration solution provided a technology demonstration.The research contents of this paper mainly include:(1)Developed a new type of vibration isolation of thick laminated rubber bearing which is used for building basement,through theoretical calculation,experimental analysis and the comparison of finite points analysis,determined the thick vertical stiffness of laminated rubber bearing,at the same time found by comparing the theoretical calculation formula is not suitable for thick laminated rubber bearing,so as to determine the thickness of laminated rubber bearing quickly theory put forward calculation formula,and to test and finite element analysis of the data to be checked.(2)The environmental vibration evaluation indexes commonly used in China are analyzed and summarized,and the mainstream environmental vibration evaluationstandards at home and abroad are integrated and compared.Taking Guangzhou metro line 6 as the analog project and using the measured data as the vibration input,the vibration response evaluation of the adjacent buildings of Shenzhen middle school subway was carried out,and the vibration isolation design scheme was developed based on the vibration response evaluation.(3)According to the engineering characteristics,the propagation law of subway vehicle-induced vibration in frame structure and large-span roof structure was analyzed.Based on the research and development of thick laminated rubber bearings,the base isolation design of the structure was carried out,and the response changes of the superstructure of the teaching building before and after vibration isolation were analyzed by applying the domestic mainstream environmental vibration evaluation index,and the Suggestions and opinions for the comfort evaluation were given.The calculation results show that the vertical acceleration peak of the upper structure after isolation decreased from 0.036 m/s2 to 0.011 m/s2,and the maximum vertical vibration level decreased from 73.2 dB to 63.7 dB.The vibration isolation efficiency of the peak acceleration reached 69.4 %,and the vibration level decreased by a maximum of 9.5 dB.Vibration isolation is good.The calculation results show that the vertical acceleration peak of the upper structure after isolation decreased from 0.036m/s2 to 0.011 m/s2,and the maximum vertical vibration level decreased from 73.2 dB to 63.7 dB.The vibration isolation efficiency of the peak acceleration reached 69.4 %,and the vibration level decreased by a maximum of 9.5 dB.Vibration isolation is good.