Abstract
Most of the buildings in old city cores of Croatia, built between 1860 and 1920 with wooden floors, are mainly designed to bear vertical loads. In this paper we propose a methodology for seismic vulnerability assessment of unreinforced masonry buildings with flexible floors. The methodology is based on the calculation of Damage Index (DI), a numerical value indicating the level of structural damage. In this methodology, the structure is represented using an SDOF model determined by damping, weight, elastic base shear capacity, elastic stiffness and post-elastic stiffness. Using accelerograms of earthquakes, step by step time-history numerical integrations are provided along with the results: top displacement, yield excursions, cumulative energy and base shear–displacement. These results serve as parameters which are then input in the formula for Damage Index (DI). The results of the paper are presented in the form of diagrams with DI values on the y axis and fundamental period of the structure on the x axis. These spectral functions of DI, along with knowledge of fundamental period and chosen accelerogram, can be used to quickly determine the level of damage for unreinforced masonry buildings with flexible floors.
Highlights
Communities around the world face natural hazards, it is important to have an approach to natural hazards developing disaster response systems but considering disaster risk preparedness and mitigation as an integral part of sustainable development
In this paper we propose a methodology for seismic vulnerability assessment of unreinforced masonry buildings with flexible floors
The aim of this study is to extend the current research of Morić considering seismic vulnerability of masonry buildings and to create spectral functions of Damage Index (DI) for unreinforced masonry (URM) with flexible floors
Summary
Communities around the world face natural hazards, it is important to have an approach to natural hazards developing disaster response systems but considering disaster risk preparedness and mitigation as an integral part of sustainable development. Step by step time-history numerical integration can be provided along with the results: top displacements, yield excursions, cumulative energy and base shear–displacements. These results serve as parameters which are input in the formula for DI. This methodology was verified for RC frame and wall structures and the spectral functions of DI (plot of a number SDOF models with different fundamental periods) were created for RC framed structures. The aim of this study is to extend the current research of Morić considering seismic vulnerability of masonry buildings and to create spectral functions of DI for URM with flexible floors
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