- Title
- Reliability-based assessment of safety factors for masonry walls in vertical bending
- Creator
- Stewart, Mark G.; Masia, Mark J.
- Relation
- 13th North American Masonry Conference. 13th North American Masonry Conference (Salt Lake City, Ut. 16-19 June, 2019) p. 1159-1170
- Relation
- ARC.DP180102334 http://purl.org/au-research/grants/arc/DP180102334
- Relation
- https://masonrysociety.org/wp-content/uploads/2019/05/13NAMC-Program-Book-of-Abstracts.pdf?__cf_chl_tk=tSSDfKjPPKRylQBRvHFlkRtOWNS36qQirVfUf5Bd0ok-1666745351-0-gaNycGzNCtE
- Publisher
- The Masonry Society
- Resource Type
- conference paper
- Date
- 2019
- Description
- Reliability-based calibration of partial safety factors ensures that structures are constructed to acceptable and consistent levels of safety. In Australia, this has led to the capacity reduction factor in the Australian Masonry Structures Code AS3700 being increased from 0.45 to 0.75 for unreinforced masonry walls in compression – i.e., a 67% increase in design capacity. The structural reliability of unreinforced masonry walls in one-way vertical bending under out-of-plane loading is the topic of this paper. High unit-to-unit spatial variability is observed, particularly for flexural tensile bond strength, due to variations in the quality of the workmanship, the weather during construction, and the materials from location to location. Hence, a stochastic computational model is developed which combines the Finite Element Method and Monte Carlo simulation to study how the unit-to-unit spatial variability of material properties affects failure progression and wall strength. Other work has quantified the probabilistic characterization of model error and flexural bond strength. A structural reliability analysis is developed for single skin infill masonry panels subject to a lateral (wind) load and where there is no vertical pre-compression. Two predictive models are used: (i) AS3700 design models, and (ii) FEA model. The structural reliability analyses consider the random variability of model errors, flexural bond strength, brick thickness, brick self-weight, and wind load. The effect of selection of predictive model on structural reliability is also assessed. Annual reliabilities are compared to target reliabilities recommended by ISO2394-2015, and capacity reduction factors are proposed and compared to the Australian Masonry Code AS3700-2018. It was found that there is evidence to support increasing the capacity reduction factor for flexure from 0.60 to 0.65 – i.e., an 8% increase in design capacity.
- Subject
- reliability; safety; code calibration; probability; masonry walls; vertical bending
- Identifier
- http://hdl.handle.net/1959.13/1459900
- Identifier
- uon:45810
- Identifier
- ISBN:9781929081615
- Language
- eng
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