Оценка динамической реакции каркасного здания под воздействием микросейсмического шума в г. Улан-Баторе

Abstract

During the long-term operation of buildings, damage is accumulated in structural elements leading to violations of strength bonds, especially during seismic impacts. Therefore, for buildings and structures located in areas having high seismic activity, periodic monitoring of the technical condition of buildings is recommended. Given the dependence of dynamic characteristics on the integral strength properties of structures, monitoring should be based on a study of the dynamic characteristics of building structures. The present studies were carried out using a microdynamic method based on a determination of the transfer functions between vibrations at the nodal points of the structure and microseismic noise measured at the building base. The actual mechanical properties of the supporting structures take into account the spatial work of the building as a whole under the action of loads. Affecting any design, earth-quakes are acknowledged to result in vibration effects leading to structural instability including base soils. The direction of mechanical impact development during an earthquake must also be taken into account. The paper presents the results of dynamic response studies into microseismic effects affecting an 8-storey frame building. The initial natural frequencies and modes of vibration are determined along with the damping constants to form a basis for the monitoring of the changes in the technical condition of the building following a given period of operation.