Analysis And Design Of Vibration Isolation Of Buildings Subjected To Subway Vibration Research On Vibration Response

With the rapid development of China's social economy and the continuous advancement of urbanization,the urban population and buildings are becoming more and more dense,people's requirements for the comfort of daily life are gradually increasing,and the impact of vibration caused by subway operation on building structures,human health,and precision instruments More and more attention by the country and people.Based on a vibration isolation project of a proposed design building of Peking University,this paper uses field measurement and numerical simulation methods to analyze and study the vibration isolation design of this project.Taking a dormitory building as an example,the control variable method is adopted to further study the vibration transmission law of a frame structure subway using a steel spring vibration isolation system by changing the parameters of the vibration isolation system and the frame structure.The research content of this article can provide a certain reference for engineering applications.The main work is as follows:(1)On the basis of comprehensive literature at home and abroad,the research status of the impact of environmental vibration induced by subway trains on adjacent buildings is elaborated,the relevant theories and analysis methods of vibration control technology are summarized,and domestic and foreign vibration evaluation standards are collated.And the calculation method of the evaluation quantity provides sufficient theoretical support for the later research.(2)Conducted two on-site vibration tests.For the first time,an analog test was carried out on new physical buildings that were similarly affected by subway vibration.The frequency components of the subway vibration and the distribution of excellent frequency bands were analyzed.The effects of environmental vibration induced by subway train operation on adjacent buildings were analyzed from the measured point of view.The impact of subway vibration on the proposed design building was assessed.The second time,the vibration test was carried out on the foundation pit site of the proposed design building,and the measured data was used as the time history incentive for the subsequent finite element analysis model of the vibration isolation design of the proposed design building.(3)The SAP2000 finite element analysis software was used to establish the vibration isolation analysis model of the proposed design building,and the measured acceleration data of the foundation pit was uniformly and integrally input to the structural base for dynamic time history analysis.Furthermore,the vibration response of each evaluation point was analyzed in time and frequency domain,and whether the vibration isolation structure satisfies relevant vibration standards was evaluated.The results show that the steel spring vibration isolation system has good vibration isolation effect.(4)In order to further study the vibration transmission law of the frame structure subway using the steel spring vibration isolation system,the various parameters of the steel spring vibration isolation system and the frame structure are used as control variables to establish a multi-mode analysis model.The vibration response results of working conditions were carried out,and the change law of the stiffness,damping and concrete strength level of the frame structure,the height of the structure,the total number of floors,and the section of the member on the vibration response of the subway structure of the building structure were obtained.