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Số người truy cập: 107,078,802

 Temperature and Stress in Concrete Cylinder Specimen Subject to Uniform Heat Flux: A Numerical Solution
Tác giả hoặc Nhóm tác giả: Le, Quang X.; Dao, Vinh T. N.; Torero, Jose L.
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Nơi đăng: In: Dilum Fernando, Jin-Guang Teng and Jose L Torero, Proceedings of the Second International Conference on Performance-based and Life-cycle Structural Engineering (PLSE 2015). International Conference on Performance-based and Life-cycle Structural Engineering, Brisbane Australia; Số: N/A;Từ->đến trang: 1060-1068;Năm: 2015
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The outbreak of fire in a concrete infrastructure can have disastrous consequences, including severe structural damage, total loss of contents, and loss of life. Adequate structural fire design is therefore critical. Despite significant past studies, our understanding of concrete performance in fire remains inadequate. This paper will first highlight major limitations of conventional testing and accordingly of resulting constitutive models for concrete at elevated temperatures. The paper will then detail results of a thermal-stress coupling analysis as part of an ongoing research at The University of Queensland that aims to develop more realistic constitutive models through studying performance of concrete cylinders subject to known consistent heat flux boundary conditions. It is clearly shown that (i) Different levels of incident heat flux causes significantly different evolution of temperature and stress profiles within the specimen; and (ii) Such profiles and their nature may be considerably modified by mechanical loading. Accordingly, heat flux, and temperature gradient by extension, may have non-negligible influence on thermal and structural behaviour of concrete and concrete structures – Such influence has not been captured in currently available models.
ABSTRACT
The outbreak of fire in a concrete infrastructure can have disastrous consequences, including severe structural damage, total loss of contents, and loss of life. Adequate structural fire design is therefore critical. Despite significant past studies, our understanding of concrete performance in fire remains inadequate. This paper will first highlight major limitations of conventional testing and accordingly of resulting constitutive models for concrete at elevated temperatures. The paper will then detail results of a thermal-stress coupling analysis as part of an ongoing research at The University of Queensland that aims to develop more realistic constitutive models through studying performance of concrete cylinders subject to known consistent heat flux boundary conditions. It is clearly shown that (i) Different levels of incident heat flux causes significantly different evolution of temperature and stress profiles within the specimen; and (ii) Such profiles and their nature may be considerably modified by mechanical loading. Accordingly, heat flux, and temperature gradient by extension, may have non-negligible influence on thermal and structural behaviour of concrete and concrete structures – Such influence has not been captured in currently available models.
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