Reliability analysis of pavement snow melting based on multi-factor

To investigate the effects of multiple random factors on ground-source heat pump reliability,the reliability equation were established based on the analysis of the principle of deicing and snow melting and the random character of snow melting system which concerns the stochastic characters of multiple factors.The centre point method and checking point method were introduced.Reliability index and failure probability calculation formulas can directly deduced by using the centre point method.Reliability index and design value of checking point can be determined by the checking point method combined with the iterative method.Combined with engineering example,heat load of deicing and snow melting were calculated given different environment conditions and reliability conditions.The heat load will increased based on snowfall and outdoor temperature randomness compared with only concerning the snowfall randomness,but that can guarantee the stability and safety of the system.At the same time,compared to outdoor temperature,snowfall has the most significant impact on heat load.Compared to the center point method and the checking point method,their conclusions are consistent.The calculation amount of the checking point method is bigger than central point method's,but the calculation accuracy of checking point method is higher.