Thermal stresses from one-sided heating of asymmetric composite span


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Title: Thermal stresses from one-sided heating of asymmetric composite span

Author(s): J. Karlikowski

Publication: KILW

Volume: 51

Issue: 4

Appears on pages(s): 609-628

Keywords: thermal stresses

Date: 10/1/2005

The aim of this paper is to determine thermal stresses in a span of a railway bridge of steel-concrete composite structure. It is a simple-supported span with two main girders. One of the steel girders is heated considerably, that leads to elongation, bending and torsion of the entire span as well as formation of normal. Thermal normal stresses. This article presents a solution to this problem for a temperature distribution in the section of the heated girder as shown in Fig. 2b. It has been assumed that the temperature distribution does not change along the span length. The span has bee treated as a thin-walled bar with asymmetric non-deformable open section. A general formula for normal thermal stresses has been developed (2.5)2 as well as relationships presenting geometrical thermal characteristics of the section (5.10). Function β (x) characterizing the torsional stress distribution along the span length has been determined and an analytical program has been developed. An example of analytical results also has be3en included in this article. The model of a thin-walled bar leads to a thermal stress distribution in the slab which differs considerably from the stress distribution from the model of a plane beam, which is commonly used for analysis. Including torsion in the analysis has a significant impact on the thermal stress distribution in the cross-section of the span. It also causes the stresses to change along the length of the span, despite the uniform temperature distribution in all cross-sections.

Polish Academy of Sciences, International Partner Access.

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