Temperature sensitivity analysis and service performance evaluation of aqueduct arch ring beam structures based on finite element method

This study investigates the temperature sensitivity and service performance of aqueduct arch ring beam structures through comprehensive finite element analysis. A thermal-structural coupling model was developed to analyze temperature field distributions and structural response characteristics under various environmental conditions. The research reveals that temperature-induced stresses reach 40-60% of allowable limits, with maximum concentrations occurring at arch-beam connection regions. Seasonal temperature variations spanning 58 °C create significant thermal cycling effects that impact long-term structural durability. The comprehensive service performance evaluation model yields an overall condition rating of 73.0 (Good grade), identifying thermal fatigue resistance and durability as critical performance limitations. The arch crown experiences maximum temperature fluctuations with peak thermal stresses of 4.5 MPa during extreme heating conditions. The study establishes quantitative assessment frameworks for condition monitoring and provides engineering recommendations including enhanced thermal protection systems and temperature monitoring implementations. The findings support improved design methodologies and maintenance strategies for critical water infrastructure systems under environmental temperature effects.