To the Question of Vibration Levels Prediction Inside Residential Buildings Caused by Underground Traffic

Currently, in the domestic regulatory documents there is no clearly formulated and scientifically grounded methodology of the floor vibration forecast inside the residential buildings, which will enable to calculate the compliance of floor vibration levels of designed or reconstructed building to meet the requirements of Sanitary standards SN 2.2.4/2.1.8.566-96. Currently functional standard SP 23-105-2004 allows you to assess only the vibration levels of the ground surface near the edge of the designed structure. Currently existing methods of conversion from vibration levels of the ground surface to the load bearing structures are often highly contingent and empirical in nature. The main steps in the conversion from the vibration levels of the ground surface to the vibration levels of the floors are: 1) determination of the vibration reduction at the transition from the ground to the foundation of the residential buildings; 2) determination of the vibration transmission losses through the building constructions; 3) determination of the resonant increase of oscillations in the center of the floor compared the oscillation of its contour. In this regard, we conducted field measurements of the vibration levels of the ground surface, of the building foundation and both of the contour and mid-span of the floor inside a 6-storey building located close to the Arbatsko-Pokrovskaya line of the Moscow metro. During the measurements at least 10 passes of underground trains were recorded, through the nearest, in relation to the investigated building, and the far tunnels. The paper presents calculated and averaged over the time of measurements transmission coefficients of vertical vibrations in similar buildings and surrounding ground. The calculated transfer coefficients can be used to predict vibration levels in similar buildings subjected to underground traffic impact.