Abstract
The present study investigates the impact of the soil saturation level on the performance of unreinforced masonry (URM) buildings when subjected to seismic excitations. More specifically, this paper examines the dynamic response of an ordinary stone-built URM building, firstly in its initial state and subsequently when it is slightly retrofitted with reinforced concrete beams at the perimeter in both storeys and also reinforced concrete instead of wooden lintels above the openings. The assessment of the behavior of this typical URM building, taking into account the soil-structure interaction (SSI) along with the nonlinear behavior both of the soil and the structure is examined through incremental dynamic analyses. For this purpose, a compatible in terms of soil conditions, set of twenty ground motions was selected, each scaled to several levels of seismic intensity. Subsequently, multiple nonlinear dynamic analyses of the coupled model of soil and structure were performed. In addition, these calculations were repeated for eight different saturation levels covering a wide range of soil conditions to elaborately investigate the problem at hand.
Highlights
In engineering practice, apart from following the general guidelines of the seismic norms, usually none special attention is given on soil compliance and the related soil—structure interaction when designing a low-rise ordinary building
As presented in the sequence, the whole process was repeated for eight different soil saturation conditions, as shown in Table 4, and multiple intensity measures (IMs)-engineering demand parameters (EDPs) plots were produced, in which dynamic instability occurred as a result of a sudden increase in the chosen EDP
In this work the seismic response of a typical two-story masonry building was studied via finite element modeling utilizing an incremental non-linear dynamic process
Summary
Apart from following the general guidelines of the seismic norms, usually none special attention is given on soil compliance and the related soil—structure interaction when designing a low-rise ordinary building. This light intervention scheme was deliberately chosen in order to keep unchanged the weight and the fundamental period of the examined building, since any change most probably would alter substantially the impact of soil saturation level and the related SSI on the structural system, which is the main focus of the present study.
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