Reliability Analysis Of Highway Prestressed Concrete Bridge Bearing Capacity And Its Parameter Control In Construction

In the construction process of prestressed concrete beams, quality problems in engineering will bring the serious consequences to the structural quality, directly affect the bridge function, thus it is necessary to make a comprehensive evaluation on the construction quality of bridge. Quality Inspection and Evaluation Standards for Highway Engineering provides a weighted scoring method for project quality evaluation, but it did not fully take the randomness in construction process into account.Based on the randomness in construction process, the construction reliability of prestressed concrete bridge was studied, and a construction control process of prestressed concrete beam was proposed according to the quality control theory. The main work and conclusions are as follows:(1) In this paper, a detailed survey was carried out on the construction materials and prestressed tension level of prestressed T-tye beams, and in order to obtain the related statistical parameters of random variables, the mathematical statistics method was adopted to make a distribution fitting on the above random variables. Then by using the Bayesian updating method which combines the statistical parameter of field investigation data and the empirical statistical results, we can get values of the statistics variables.(2) Through the advanced first order and second moment method (checking point method), programming to calculate construction reliability was carried out for the construction reliability on bearing capacity. Also, the above result was verified by Monte Carlo algorithm. The results show that the construction reliability index of prestressed concrete beam bearing capacity is4.04. By a numerical simulation, the bearing capacity of the4000beams can meet the design requirements entirely.(3) The factors affecting the reliability on the bearing capacity were analyzed to identify construction reliability on the sensitivity of random variables, and based on the proposed quality control requirements (parameter control) which matched the target construction reliability. Refer to control chart in quality control theory, monitoring the mean and standard deviation of concrete strength, steel strand tension level.