Abstract
The paper provides information concerning the dynamic response of building structures exposed to paraseismic loadings. Dynamic loadings can arise inside buildings or can be transmitted to buildings through subsoil, causing vibrations of structures. To carry out a dynamic diagnostics of existing buildings, it is necessary to take measurements of vibration parameters directly from the investigated structure. The paper presents some examples of such investigations, as well as a comparison of the obtained results and calculations with standard dynamic characteristics of existing buildings.
Highlights
Building structures, during many years of operation life, are subject to various dynamic influences, coming from sources located outside the building as well as those inside the object
The measurements and diagnostic analysis were carried out, based on recommendations contained in valid standards regulations and those found in literature concerning building structures diagnostics
Based on the analysis found in literature and on the author’s own research concerning affecting the design structure of façade walls, especially that of façade plate made of 3 cm – thick architectural glass of the dimensions: 150 cm ϫ 405 cm and 100 cm ϫ 405 cm a criterion of velocity was adopted
Summary
Building structures, during many years of operation life, are subject to various dynamic influences, coming from sources located outside the building (for example – street traffic, construction machines’ activities) as well as those inside the object (air conditioning and ventilation equipment, personal and cargo lifts, other machines and equipment, installed in the object under consideration). In accordance with the valid law (Art. 62 of the Building Law [1]) users are obliged to carry out, at least once every five years, basic periodical checks aimed at the evaluation of the technical state and usability of the building, related to the efficiency of the whole structure under conditions of the existing and planned influences Such checking procedure should deliver an answer as regarding the possibility of the object’s further use in a defined operation life and present guidelines concerning repairs, operation and maintenance limitations and recommendations for the future. Investigations of dynamic influences affecting buildings and construction structures are often closely linked with practical difficulties resulting from stochasticity of the process observed They occur not in defined and repeatable laboratory conditions but, in the natural environment, in a situation when vibrations sources are of a non-determined character. In further part of the paper results of investigations nonstationary multiple transient dynamic influences affecting the work of reinforced concrete and steel structure of an administration and office building will be presented
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