Ocena potresnega tveganja zidanih stavbSnoj, Jure (Avtor) Dolšek, Matjaž (Mentor) gradbeništvodisertacijepotresno tveganjezidane stavbeanaliza negotovostiobčutljivostna analizaanaliza izgubverjetnost porušitveambientne in vsiljene vibracijeinkrementalna dinamična analizapotisna analizaekonomska izgubapričakovana letna izgubaIn this thesis a new methodology for the seismic risk assessment of masonry buildings is presented. It is based on a probabilistic approach, which makes it possible to determine seismic risk using various performance measures such as the probability of exceeding a certain damage state, the probability of exceeding a certain economic loss, the expected annual loss, and the loss dependent on a given seismic intensity. Using these performance measures engineers and project stakeholders can make informed decisions as to whether particular existing buildings should be repaired, strengthened, or replaced, or simply choose the best variant in the design of a new building. The methodology consists of four main steps: hazard analysis, structural analysis, damage analysis and loss analysis. The results from these four separate analyses are combined together in a probabilistic manner, using the total probability theorem, thus making it possible to explicitly take into account numerous uncertainties. However, in this study the main focus was on the modelling uncertainties, and on the aleatoric uncertainties which are due to record-to-record variability. A database of experimental data obtained in the testing of numerous masonry specimens was established, and analysed in order to define fragility functions for masonry elements failing in shear or flexure, while also evaluating the uncertainties in the limit-state deformations of the masonry walls. The possibility of reducing the impact of uncertain input parameters by means of non-destructive tests was also explored. By measuring its ambient and forced vibrations, the vibration periods of an old masonry building in Ljubljana were determined, and used to calibrate corresponding structural models. It was shown that such non-destructive experimental investigations can contribute to more reliable seismic performance assessments of buildings, even when the performance assessment procedure is based on a nonlinear method of analysis. In addition to the explicit consideration of uncertainties, damage to the components of buildings was also explicitly simulated on the basis of the relationship between the seismic intensity and the engineering demand parameters which were obtained by simplified nonlinear analysis. The latter consisted of pushover analysis, together with incremental dynamic analysis of a SDOF model. The applicability of the proposed methodology was demonstrated by means of examples of a residential and a commercial building, which were constructed from hollow clay bricks or solid bricks. Under the presumptions of this study, the expected annual loss for buildings constructed with hollow clay bricks was 60 €/100m2 of the gross floor area, and 125 €/100m2 in the case of buildings which were made from older material consisting of solid bricks. Disaggregation of the results showed that weaker earthquakes with lower intensities contribute significantly towards the expected annual losses. It was also found that nonstructural elements, which are key components in the loss assessment model, can contribute more than 50 % of the total loss. The modelling uncertainties have a large impact on the results of the pushover analysis and of those obtained by incremental dynamic analysis, as well as on the probability of exceeding damage states. However their impact on loss estimates is more pronounced in the case of the fragility and loss functions, seismic hazard, and the costs of replacing the building.[J. Snoj]20142015-07-10 10:14:54Doktorsko delo/naloga32347sl