Analytical solution of the response of the I-shaped beam to the tubular column connections at high temperature

Articles in Press

Document Type : Research Article

Authors

1 Faculty of passive defense, malek ashtar university of technology, iran

2 Faculty of Civil and Environmantal Eng., Khaje-Nasir-Toosi University of Technology

3 Faculty of passive defense, malek ashtar university of technology

Abstract

Off-shore platforms constructed for oil and gas production are prone to high potential fire risks.These probable fire incidents may cause local or global structural damages. In this paper a closed form analytical solution for the prediction of moment-rotation and the rotational stiffness-rotation curves of I-beam-to-tubular leg connections, commonly used in off-shore platforms, in elevated temperatures is presented. In order to define the behavior of the connection a bounding line moment-rotation model based on the works of Al-Bermani et al. was proposed. The required yield and plastic moments in this model were provided by the authors extending Roark's relationships. Then, having the values of yield and plastic moments it is possible to depict M - φ and kj - φ curves of these connections in ordinary temperatures. Comparing the analytical results to experimental and numerical results indicates that the analytical relationships present acceptable approximations. Relating the I-shaped beam to cylindrical column connection's stiffness in high temperatures to ordinary temperatures, it is then possible to extend the M - φ and kj - φ curves of ordinary temperatures to high temperatures using the above equations. The results of this model are compared with those of a non-linear coupled mechanical-thermal finite element model previously provided by the authors, which was in turn validated using small-scale and large-scale experimental tests. Reasonable agreement has been found between the analytical model results and the experimental/numerical modeling results.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 07 January 2025

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