Reliability-Based Analysis for Thermal Break System under Low-Cycle Climatic Fatigue Loads
Publication: Journal of Structural Engineering
Volume 145, Issue 3
Abstract
In buildings, thermal bridging can be formed through structural components such as protruding balconies. For this reason, thermal break systems are used to limit heat flow in order to fulfill code requirements. With balconies exposed to significant variations of outside temperature, the thermal break systems undergo large horizontal deformations that might lead to yielding several times throughout its service life. Assessing the design in these conditions requires a low-cycle fatigue verification, which is unusual in the building design. As a consequence, the whole safety format must be redefined, with a proper account of the uncertainties in the definition of the actions and in the model for the resistance. This paper presents a reliability-based analysis for the calibration of the safety factor that takes into account these uncertainties. The energy-based fatigue life curve and the cyclic force-displacement relationship of the thermal break system are constructed based on the low-cycle fatigue experimental test data. The mechanical behavior of the thermal break system is modeled by a coupled plastic-damage model. For the fatigue verification, the climatic loads are defined based on the temperature history obtained from European Climate Assessment & Dataset (ECA&D). The limit state equation for fatigue failure is written based on the energy-based fatigue life curve and Miner’s rule to describe the reliability model. This reliability model includes the uncertainties related to the strength, the loads, and the accumulated damage. The effect of these uncertainties on the safety factor is discussed for the city of Embrun in France. At last, the sensitivity of the safety factor with the locations is expressed based on the data from 33 cities in France.
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Acknowledgments
The authors gratefully acknowledge financial support by the ANR (Agence Nationale de la Recherche, France) through the project LabCom ANR B-HYBRID.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 3 • March 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 13, 2018
Accepted: Aug 17, 2018
Published online: Jan 7, 2019
Published in print: Mar 1, 2019
Discussion open until: Jun 7, 2019
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