Fatigue reliability analysis of concrete structures based on physical synthesis method

摘要

A new method, namely the physical synthesis method, is proposed for fatigue reliability analysis of concrete structures. With the fatigue damage development as a basis of fatigue reliability analysis, the stochastic fatigue damage model for concrete is introduced to obtain the damage evolution process. Afterwards, the theoretical framework of the physical synthesis method is described, and the generalized equations for the proposed method is presented, through which the structural reliability could be solved in an efficient and physically meaningful way. Subsequently, the physical synthesis method is applied to analyze the fatigue reliability of concrete structures by developing a fatigue damage-based failure criterion. Further, the implement process of the proposed method is described in detail to fulfill the assessment of the fatigue reliability for concrete structures. Finally, the application of the proposed method is carried out on the fatigue reliability analysis of a concrete bridge in engineering to demonstrate the validity and effectiveness of the proposed method. By analyzing, the probability density function of the structural response of the bridge after the probability dissipation is obtained. Meanwhile, the fatigue reliability of the bridge is well evaluated by integrating the remaining probability density function.