Analysis of the Dynamic Response of Masonry Buildings with Irregularities of Localization of Bearing Elements Due to Mining Shocks

Abstract

The study concerns the analysis of the impact of structural irregularities in the masonry buildings on their dynamic characteristics and dynamic response to kinematic loads. Several models of buildings deemed to be representative of this class of structures in the areas covered by the influence of mining tremors were analyzed. In areas Legnica-Glogow Copper District (LGCD) and the Upper Silesian Coal Basin (USCB) are the most numerous masonry buildings with a height of 1–5 storeys. The first part of the study refers to the adoption of 3-D dynamic models of buildings of different structural wall system. These were buildings with irregular, symmetrical and bisymmetrical system load-bearing walls. The second part concerns the dynamic characteristics of the building models and assessing the impact of irregularities in the load-bearing walls on the natural frequencies. Subsequently, using the response spectrum method and assuming different standard response spectra, dynamic responses of building models were determined. The level of dynamic principal and shear, depending on the adopted standard curve, describing the response spectrum and irregularities in the structural walls, were also evaluated. The results of numerical analyzes showed a significant influence of the structural irregularities on the natural frequencies of the analyzed models of buildings. It also showed the impact of the adopted standard response spectrum curve in the LGCD on the level of calculated stresses.