Reliability Analysis of Deflection Control of Prestressed Concrete Crane Beam

The report is intended to establish the reliability analysis method of prestressed concrete crane beam and analyze its influence factors. Previous studies have shown that due to lack of an appropriate probability model to accurately reflect the random variables of the vertical crane load and determination of variable effect by the maximum value of the combination of random variables, the deflection control level is unknown. Therefore, to make up for the deficiency, the design method of deflection control of prestressed concrete crane beam was analyzed using the probability model of crane vertical load and the stochastic process combination method. Then, the reliability indexes of prestressed concrete crane beams required not to crack and prestressed concrete crane beams allowed to crack are calculated under different control years, and the factors affecting the deflection control are analyzed. The results revealed that it is appropriate for reliability control of prestressed concrete crane beam required not to crack, but a little conservative for reliability control of prestressed concrete crane beam allowed to crack in the national standard GB 50153-2008[1], which can be adjusted. From these results, it is recommended that reliability control level can be adjusted appropriately according to the importance of influencing factors.