Comparative analysis of the dynamic characteristics of various types of buildings during microseismic vibrations

Abstract

Relevance. The study of the behavior of buildings in natural conditions and a comparative analysis of their dynamic characteristics is considered an important task of scientific research and applied nature, in particular, for monitoring their technical condition and certification. This task is relevant especially in the territory of Armenia, taking into account the intensive high seismicity of the region. The paper presents the experimental results of studies of the dynamic characteristics of 6 residential buildings of different storeys, erected in different soil conditions, from recordings of microtremors using seismic instruments specially developed at IGES NAS RA. The choice of the buildings has been carried out taking into account the fact that earlier experiments had been carried out on them to identify their dynamic characteristics. The aim of the work is to check the actual state of buildings, to compare the actual and previously acquired dynamic characteristics of the buildings under study. Methods. Our methodology for studying the behavior of buildings have been carried out using a mobile seismic station, consisting of three receivers – seismic sensors SM-3 (two horizontal and one vertical component), a general unit for transformation, control and registration powered by IGES NAS RA. With the help of this logger, it is possible to conduct online monitoring of the records that are presented on the laptop monitor. Microtremor measurements have been carried out on each floor and in all sections of the buildings under study, as well as on the basement soil. The vibration periods of buildings and soilshave been also determined in the transverse, longitudinal and vertical directions. The measurements have been taken at night to ensure that only natural microseismic vibrations have been caused on the soils and buildings. Results. As a result, we have carried out a comparative analysis of the obtained experimental values of dynamic characteristics and previously acquired data. The main regularities of changes in dynamic characteristics during microseisms are revealed and an assessment of the condition of the buildings is given. The features of the joint work of buildings and soils have been discovered. He actual values of the periods acquired for the buildings under study have been compared with the corresponding data presented in the current regulatory documents.