Calculation of transverse thermal stress of inverted siphons under fold line distribution of temperature difference
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Abstract:
Based on the fold line distribution function of temperature difference for highway bridges, we derived the calculation formulas for transverse thermal self-restraint stress and framework-restraint stress of inverted siphons. Using the calculation formulas, we calculated the thermal stress of inverted siphons in winter downtime when cold snap invades. Our calculations showed that the total stress of the inner surface of an inverted siphon is a function of the wall thickness and the temperature difference. When wall thickness is constant and temperature difference decreases by 50%, the thermal stress also decreases by 50%. When the temperature difference is constant and the wall thickness decreases by 50%, the thermal stress decreases by 17%. The thermal stress of inverted siphons calculated by the fold line distribution function of temperature difference was larger than that calculated by the exponential distribution function. If the temperature load of inverted siphons is considered on this basis in design, the crack resistance of inverted siphons can be significantly improved.
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