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Consideration of Partial safety factor method for snow load

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Authors

Salehi, Hamidreza; Jäger, Wolfram

Issue Date
2019-05-26
Citation
13th International Conference on Applications of Statistics and Probability in Civil Engineering(ICASP13), Seoul, South Korea, May 26-30, 2019
Abstract
The partial safety factor method is the concept used in the current Eurocode system. Recommended partial safety factors application should lead to results which are compatible with the safety requirements. These requirements are represented by the target values of reliability in EN-1990. Different basic variables such as actions, resistance and geometry are contributing in the reliability of structures. Variable loads and climate actions have high values of coefficient of variation. This high deviation has a strong influence in cases with high ratios of variable load to permanent actions. The reliability calculations show that in the presence of snow and low ratio of permanent load, the current partial factors are not satisfying the target reliably level. This phenomenon usually is occurring in the case of light-weight structures. In order to reach the target reliability level, more safety measures are required to be introduced for design with snow actions. A new method for applying an increasing factor for a partial factor of snow actions is proposed and investigated based on reliability analysis. Different ratios of loading with all possible load combinations in EN-1990 and different types of structure are considered to be compared with the results of the Eurocode. Application of this new strategy is providing more consistent behavior of reliability in the whole range of load ratios. Introducing the increasing factor leads to a higher reliability level.
Language
English
URI
https://hdl.handle.net/10371/153472
DOI
https://doi.org/10.22725/ICASP13.334
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