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原文传递 Reliability-Based Analysis for Thermal Break System under Low-Cycle Climatic Fatigue Loads

题名：	Reliability-Based Analysis for Thermal Break System under Low-Cycle Climatic Fatigue Loads
正文语种：	英文
作者：	Piseth Heng1; Benoit Le Gac2; Pisey Keo3; Hugues Somja4; Franck Palas5
作者单位：	1Postdoctoral Researcher, Institut National des Sciences Appliquees de Rennes, Laboratoire de Génie Civil et Génie Mécanique/Structural Engineering Research Group, 20 Avenue des Buttes de Coesmes, CS 70839, F-35708 Rennes Cedex 7, France (corresponding author). 2Ph.D. Candidate, Université Européenne de Bretagne–Institut National des Sciences Appliquees de Rennes, Laboratoire de Génie Civil et Génie Mécanique/Structural Engineering Research Group, 20 Avenue des Buttes de Coesmes, CS 70839, F-35708 Rennes Cedex 7, France; Engineer, INGENOVA, Civil Engineering Office, 5 Rue Louis Jacques Daguerre, 35136 Saint-Jacques-de-la-Lande, France. 3Postdoctoral Researcher, Institut National des Sciences Appliquees de Rennes, Laboratoire de Génie Civil et Génie Mécanique/Structural Engineering Research Group, 20 Avenue des Buttes de Co?smes, CS 70839, F-35708 Rennes Cedex 7, France. 4Associate Professor, Institut National des Sciences Appliquees de Rennes, Laboratoire de Génie Civil et Génie Mécanique/Structural Engineering Research Group, 20 Avenue des Buttes de Co?smes, CS 70839, F-35708 Rennes Cedex 7, France. 5Director, INGENOVA, Civil Engineering Office, 5 Rue Louis Jacques Daguerre, 35136 Saint-Jacques-de-la-Lande, France.
关键词：	Reliability analysis; Safety factor; Thermal break; Low-cycle fatigue load; Epistemic uncertainties
摘要：	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 plasticdamage 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.
出版年：	2019
期刊名称：	Journal of Structural Engineering
卷：	145
期：	3
页码：	1-10