Theoretical analysis and numerical simulation on behaviour properties of large span cable-supported structures under fire conditions |
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Authors: | Yin Bai YongJiu Shi YuanQing Wang |
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Affiliation: | (1) Department of Civil Engineering, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua University, Beijing, 100084, China |
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Abstract: | Large span cable-supported structures have been developed rapidly in China, and they always adopt high-strength steel cables
as structural members. However, the modulus of elasticity and yield strength of steel material will decrease seriously under
fire conditions while fire protection is unlikely to be provided for steel cable. Several typical large span cable-supported
structures such as cable truss, beam string structure and prestressed cable net are studied on their structural behaviour
in this paper. Theoretical formulae are derived in terms of geometrical and material nonlinearity with high temperature effect.
Finite element models are also established to simulate the structural performance under fire conditions. The calculation formulae
for fire-resisting design are suggested for these three types of structures, while displacement and prestressed force variation
rules are also given. |
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Keywords: | cable-supported structure fire resisting design theoretical deriviation prestensioning force variation FEA model |
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