APPARATUS FOR EVALUATING SAFETY OF BUILDING USING EARTHQUAKE ACCELERATION MEASUREMENT

摘要

Disclosed herein is an apparatus for evaluating the safety of a building. The apparatus includes first and second measurement instruments which measure earthquake accelerations of the top and bottom stories, a fast Fourier transform unit which performs fast Fourier transform on the earthquake accelerations, an integration unit which double-integrates the measured earthquake accelerations and creates drift data of the top story and the bottom story, a maximum inter-story drift ratio calculation unit which calculates a maximum inter-story drift ratio, a natural frequency change rate calculation unit which determines a natural frequency of the building, and compares the natural frequency with an ambient natural frequency of the building so as to calculate a natural frequency change rate, and a building safety evaluation unit which compares the maximum inter-story drift ratio and the frequency change rate with preset evaluation criteria and outputs a result of evaluation in the safety of the building.

主权项

1. An apparatus for evaluating safety of a building using an earthquake acceleration measurement, comprising:
a first earthquake acceleration measurement instrument and a second earthquake acceleration measurement instrument respectively installed in a top story and a bottom story of the building, the first and second earthquake acceleration measurement instruments respectively measuring earthquake accelerations of the top story and the bottom story of the building; a fast Fourier transform unit performing fast Fourier transform on the earthquake accelerations respectively measured by the first and second earthquake acceleration measurement instruments and transforming the earthquake accelerations measured in the top story and the bottom story of the building from a time-domain function into a frequency-domain response function; an integration unit double-integrating the earthquake accelerations respectively measured by the first and second earthquake acceleration measurement instruments and creating drift data of the top story and drift data of the bottom story of the building; a maximum inter-story drift ratio calculation unit calculates a maximum inter-story drift ratio of the building using the drift data of the top story and the bottom story of the building and a height of the building; a natural frequency change rate calculation unit determining a frequency, at which a value of a transfer function calculated using a ratio of a frequency-domain response function of the top story to a frequency-domain response function of the bottom story is maximal, as a natural frequency of the building, and comparing the natural frequency with an ambient natural frequency of the building preset before an earthquake occurs, thus calculating a natural frequency change rate; and a building safety evaluation unit comparing the maximum inter-story drift ratio and the frequency change rate with preset evaluation criteria and outputting a result of evaluation in the safety of the building.