Storey-based stability of unbraced steel frames at elevated temperature |
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| Affiliation: | 1. College of Civil Engineering, Tongji University, Shanghai, 200092, China;2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China;2. Instituto de Ciencia y Tecnología del Hormigón, ICITECH, Camino de Vera s/n, Edificio 4N, Universitat Politècnica de València, E-46022 Valencia, Spain;1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2. Sichuan Fire Research Institute, Ministry of Public Security, Chengdu 610036, China;3. College of Civil Engineering, Tongji University, Shanghai 200092, China;1. School of Architecture and Civil Engineering, Xiamen University, China;2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore;1. Department of Structures, University of Campinas, Campinas, SP, Brazil;2. Department of Structural and Geotechnical Engineering, University of Sao Paulo, São Paulo, SP, Brazil |
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| Abstract: | The evaluation of the lateral stability of steel frames subject to elevated temperatures is different from that at ambient temperature. This is because the degradation of the Young's Modulus of steel associated with elevated temperature will lead to the loss of column lateral stiffness. In this study, the lateral stability of unbraced steel frames subjected to elevated temperature is investigated based on the concept of storey based buckling. First, to simulate a steel column exposed to the elevated temperature, an analytical model was proposed to examine the effects of axial loading, elevated temperature, and thermal boundary restraints on the lateral stiffness of steel columns in unbraced frames. Then, a method of evaluating the stability capacity of unbraced steel frames at elevated temperature is proposed. Numerical examples are presented to demonstrate the evaluation procedure of the proposed method and investigate the frame stability subjected to different scenarios of frame members exposed to the elevated temperature. The validity of the proposed method is verified by the numerical analysis with the use of finite element analysis. |
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