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Bestimmung des Teilsicherheitsbeiwerts für Wandscheiben aus unbewehrtem Mauerwerk
Author(s) -
Jäger Wolfram,
Salehi Hamidreza
Publication year - 2019
Publication title -
mauerwerk
Language(s) - English
Resource type - Journals
eISSN - 1437-1022
pISSN - 1432-3427
DOI - 10.1002/dama.201800033
Subject(s) - probabilistic logic , masonry , mathematics , safety factor , structural engineering , engineering , statistics
Partial safety factors for resistance applied in the design equation of semi‐probabilistic formats can be obtained from the evaluation of a test database. These partial safety factors are influenced by two factors, the material uncertainty and the model uncertainty. This topic is covered in a former publication [1]. It includes the determination of a partial factor for the model uncertainty of unreinforced masonry shear walls. In this study the authors examine the next step, and calculate the partial factor of resistance applying the same method, as recommended i n EN 1990 – Annex D. In addition to the Coefficient of Variation (COV) for the model uncertainty, the calculation of the resistance partial factor considers deviations in geometry, as well as loading and material properties. The influence of the material uncertainty on structural performance is considered in the calculation by means of a weighted average of all COV values for various types of material properties, based on the number of relevant failure modes in the test database. In the last step, the resistance partial factors for models defined in DIN EN 1996‐1‐1/NA and DIN EN 1996‐1‐1/NA – Annex K are calculated by applying the probabilistic methods recommended in EN 1990 – Annex D and the model bias.