1 前言 水利工程中,大多数构件处于弯、剪、扭共同作用的复杂受力状态,构件的单一截面上也非处于一种受力状态,即使是最有利的受力截面也可能同时受到弯矩、剪力和扭矩的共同作用,存在着导致截面失效的彼此有联系的多层次多个失效模式。传统的结构可靠性理论是以结构单一截面单一受力状态下的可靠度 1 Preface Hydraulic engineering, most of the components in the bending, shear, torsion common role in the complex state of force, the component is not in a single cross-section in a state of stress, even the most favorable section of the force may also be subject to bending Moment, shear force and torque, there is a multi-level and multiple failure modes that lead to failure of the cross-section. The traditional theory of structural reliability is based on the reliability of a single section under single stress