Finite Element Modelling of Structures Subjected to Thermal Loading
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 6
Abstract
Thermal analysis of RC structures under the effect of uniform temperature change poses a special kind of problem, where the high axial stiffness of horizontal beam elements used in finite element analysis produces correspondingly high lateral forces, and straining actions in the supporting columns, especially the ground floor columns. This effect is most pronounced for the external columns. In this study, a novel proposal is made for developing an analytical approach for assessment of the effect of bending cracks along the beam length on its axial stiffness. The proposed approach is utilized for the development of a software package for the computation of the effective axial stiffness of beams, taking into consideration the resulting cracked-section strains at the top and bottom fibers of the beam sections along its length. Effect of applying varying axial force levels to the beam is studied in detail, and curves are developed showing the variation of the beam’s axial stiffness with the applied axial loads. Effect of different parameters including steel reinforcement level, and span length are also taken into account. The analysis results are used to develop useful recommendations for design engineers, related to the reduction factors which can be applied to beams’ axial stiffnesses in finite element models, in order to simulate the practical case of thermal effect on beams subjected to bending cracks.
Authors and Affiliations
Hisham A. El-Arabaty, Gamal H. Mahmoud, Nasr E. Nasr, Mohamed A. Abdul Rahim
Keywords
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- EP ID EP438894
- DOI 10.9790/1684-1506033143.
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