Conditions for Measuring Seismic Shocks and Their Analysis and Response on Buildings and Industrial Structures

Abstract eng:
The goal of this contribution is to define the conditions and basic principles for measuring seismic loads generated by seismic shocks, process and analyze the measured response of seismic (low frequency mechanical vibration) on buildings and industrial structures and to develop a methodology for measuring on a specific structure. The conditions and basic principles for measuring can be applied for different kinds of seismic sources of excitation such as: explosions, wind, random excitation from local transportation, periodic excitation from large rotating and/or machines with reciprocating motion, metal forming processes such as forging, shearing and stamping, chemical reactions, construction and earth moving work, earthquakes and other strong deterministic and random energy sources caused by human activities. All of which negatively affect the integrity of buildings and industrial structures as well as the environment of those who live or work in such conditions. In evaluating the effects of such seismic shocks (vibration) on buildings and industrial structures, the response of these structures and the possible negative impact on them is performed. The contribution includes the appropriate analytical methods where the frequency, duration of, and amplitude is definable as well as the processing and verification of methodology and preparation of measurements, optimal location of measuring points, how to attach the sensors, the measurement equipments used, measured variables and procedure are also given. For the detection of a seismic shock resulting from an explosion the FFT analysis and modal analysis, in the frequency domain, is used and the signal was acquired and evaluated also in the time domain. In the conclusions the measured results of a seismic shock caused by blasting in a nearby quarry and its effect on a nearby structure (house) is evaluated. The response on the house, including the natural frequency and possible fatigue damage is also assessed.      

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