Effects of temperature change on elastic behavior of steel beams with semi-rigid connections |
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Authors: | Jian-guo Cai Jian Feng and Yun-long Han |
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Affiliation: | [1]Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education, Southeast University, Nanjing 210096, China [2]Engineering Research Center for Prestress of Jiangsu Province, Southeast University, Nanjing 210096, China |
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Abstract: | Based on the nonlinear displacement-strain relationship, the virtual work principle method was used to establish the nonlinear
equilibrium equations of steel beams with semi-rigid connections under vertical uniform loads and temperature change. Considering
the non-uniform temperature distribution across the thickness of beams, the formulas for stresses and vertical displacements
were presented. On the basis of a flowchart for analysis of the numerical example, the effect of temperature change on the
elastic behavior of steel beams was investigated. It is found that the maximal stress is mainly influenced by axial temperature
change, and the maximal vertical displacement is principally affected by temperature gradients. And the effect of temperature
gradients on the maximal vertical displacement decreases with the increase of rotational stiffness of joints. Both the maximal
stress and vertical displacement decrease with the increase of rotational stiffness of joints. It can be concluded that the
effects of temperature changes and rotational stiffness of joints on the elastic behavior of steel beams are significant.
However, the influence of rotational stiffness becomes smaller when the rotational stiffness is larger. |
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Keywords: | steel beams semi-rigid connections stress displacement stiffness elastic behavior temperature change virtual work principle |
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