Research On Bridge Pile Foundation Scour Reliability Based On Probability Theory

The scouring of pile foundation affects the reliability of the bridge in different degree..Therefore, the reliability of the pile foundation scour has important engineering significance.Because of the limitations of the probability method, it can’t express the certainty of the system accurately if the system is not known in advance.. Rather than probability method to structural reliability analysis is carried out under the uncertain factors of mastering the less, this many researchers on non probabilistic theory do a lot of research, and interval analysis is the study of structural non probabilistic reliability hot.In this paper, reference to domestic non probability theory and pile foundation scour reliability analysis and practice based on. For the first time, the non probabilistic reliability theory is introduced into the assessment of the reliability of the pile foundation scour, specific content is as follows:First, in reference to domestic and foreign literatures system. This paper introduces the influencing factors of the mechanism of pile foundation scour, scour around pile foundation, pile foundation scour the classification, three scour calculation formula, and interval variables and the basic operations, non almost reliability model and non probabilistic reliability index calculation method..Then the evaluation methods of pile foundation scour reliability is proposed based on the non probabilistic reliability theory, and relying on Wuhan Xinzhou old street Wangwu bridge as an example, on the bridge pile foundation for reliability assessment. Through field survey collected related data, get the basic parameters of the pile foundation scour, and discuss the limit state equation of the pile foundation scour; then the Wangwu bridge pile foundation scour the parameter sensitivity analysis, through the analysis to find out the influence of pile foundation function larger parameter, which is expressed by interval variables, respectively by using the improved one-dimensional optimization algorithm and failure point searching optimization method for solving non probabilistic reliability index, and accordingly determine pile foundation reliability.Finally, Wangwu bridge in old street as an example using interval model analysis and prediction of pile foundation scour life for pile foundation reinforcement and provide basis for protection.