Experimental monitoring and dynamic certification of building structures
Abstract
Methods of building structures (BS) dynamic certification have been developed. The methods include: BS visual and vibrodynamic examination; recommendations for the repair and restoration; BS further operation. Determination of dynamic characteristics of building structures for their free fluctuations of low amplitude, which are disturbed by the influence of natural microseisms, includes: registration of BS fluctuations by means of highly sensitive (in our case, seismic) sensors; analysis of Fourier spectrum in order to allocate resonance peaks corresponding to various forms of free oscillations; obtaining of impulse realizations of the selected resonance peaks on each form of constructions optical oscillations by means of Fourier inversion. An example of the modern regulatory requirements application for the construction scientific and technical support and building structures monitoring for the pile foundation safe arrangement on a landslide hazardous building site in conditions of dense urban development in Kyiv during the installation of a Ø820 mm bored pile according to the pile field plan has been considered. Experimentally registered levels of vibration acceleration on the building foundation wall in the vertical and horizontal directions do not exceed 0.015 m/s², which is significantly lower than the minimum permissible values of vibration acceleration for the foundations of buildings with brick bearing walls 0,15 m/s². The research also evaluated the presence of visible damage to the building in the available places and their possible development before and after piles placement. The condition of the plaster screed on a vertical crack in the house wall on the 8th floor, which was installed before the construction work start, after pile foundation installation has not changed – it remained undamaged.
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