| Subway transportation system, one of main city traffic methods, has many obvious advantages. In resent years, subway transportation systems have been developed rapidly in China. However, with the development of subway construction, some negative effects also appear. One of the serious problems is the impact of vibration induced by subway train to environment. Owing to that subway circuit in a city generally passes through downtown area, the vibration effects of the subway to the buildings and circumstance around can not be neglected. But there has been no satisfied improvement on this problem till now. To solve this problem, relevant studies are carried out in this dissertation.Based on interpretation and analysis of home and foreign relevant research, for the purpose of reducing the vibration of adjacent buildings induced by subway, the characteristics of buildings vibration induced by subway are studied by in situ experimental method and numerical simulation method. Based on above analysis, a three-dimension isolation device is developed to reduce the buildings vibration, and its practicability and feasibility are tested and verified through numerical simulation method. The main achievements and contents including: (1) Based on the relevant research production, for the purpose of analyzing the characteristics of adjacent buildings vibration induced by subway, the buildings vibration is studied by in situ experimental method, and some characteristics of the vibration are presented on the base of this actual measurement.(2) A 3D numerical model of the buildings measured actually is built with the help of SAP2000 (a finite element analysis software). With the vertical vibration waves of ground surface around induced by subway train being input by integral input method and multiple-point input method, two full dynamic analysis of actual measurement structures are carried out. These numerical simulation results are compared with the actual measurement results. And based on the analysis, a theoretical analysis modal of the buildings vibration induced by subway is presented .(3) Based on passive control theory and the characteristics of the buildings vibration induced by subway, a three-dimension isolation device (the three dimentional lead rubber-dish springs bearings) is presented and designed to reducing the buildings vibration. And the vertical stiffness and deformation performance are... |
