Predefined damage patterns for limit analysis on nonengineered masonry buildings

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2019
İçel, Cemal
Non-engineered masonry construction still constitutes a significant percentage of building stocks, especially in earthquake-prone Mediterranean, Asian and South American countries. It is not easy to quantify the seismic performance of this building type, because the analytical and numerical methods, which have been developed so far, generally work for engineered masonry buildings with specific design and construction practices. For such buildings, it is easy to define the load transfer paths through well-defined structural members. However, non-engineered masonry buildings generally do not have well-quantified material properties, rigid floor diaphragms and adequate floor-to-wall or wall-to-wall connections in order to ensure such a load path. Hence the use of conventional analysis tools become meaningless or even misleading since the seismic behavior of non-engineered buildings contradicts with the fundamentals of structural analysis and modeling, on which these analysis tools are based on. In such cases, the use of simple theoretical analyses, which are generally based on observed performance and damage on the considered building type, may provide a practical solution. This study aims to propose prescribed in-plane damage mechanisms and crack patterns for solid and perforated masonry walls by using the available post-earthquake field data obtained from damaged masonry buildings and experimental data obtained from masonry specimens. These predefined damage and crack patterns can be used as an input for lower-bound limit analysis solutions in order to estimate the lateral load capacity of non-engineered masonry buildings.