Seasonal influence of temperature on changes in the frequencies of standing waves of structures according to seismic observations

Abstract

Buildings and structures are objects of increased responsibility. Under certain conditions, they are subject to negative impacts caused by the impact of various natural and man-made factors on them. It is necessary to monitor both the technical condition of the object and the dynamic influences acting on it, possibly carrying danger both for the structure and for its parts. SEF USGS RAS has developed a method for continuous monitoring of the physical condition of structures, which allows determining the values of natural frequencies of structures from records of a continuously recording seismic station and, if significant deviations from their initial values are detected, drawing conclusions about the condition of structures. reasons for changing the dynamic state of the structure. This study will show the results of such work within the framework of the infrastructure of the Akademgorodok of Novosibirsk, where the results of observations of the natural oscillation frequencies of several residential buildings are presented. During the observations, the influence of external temperature on them was revealed - an increase in ambient temperature leads to an increase in the values of the frequency of natural oscillations, and a decrease in temperature leads to a decrease in values. The greatest change in the frequency of natural vibrations of buildings occurs in summer, at temperatures above 30 degrees C, when there is a great contrast between daytime and nighttime temperatures.