1.引言 本文在现有的一些国际流行的有关计算赘余桁架结构可靠性方法的基础上加以改进,提出了计算赘余桁架结构可靠性的强度削减一人造外载法。它将结构的失效看作是一个前后相关的失效过程,而不是象以往的算法那样,将结构的失效看作是一些孤立的状态,因而更真实地反映了赘余结构失效的方式和实质,更准确地计算出了结构真实失效概率的上下界。算例结果表明,本文算法是切实可行的。 1. INTRODUCTION Based on some existing international popular methods for calculating the reliability of redundant truss structures, this paper proposes an intensity reduction man-made external loading method for calculating the reliability of redundant truss structures. It treats the failure of a structure as an antecedent related failure process, rather than treating the failure of a structure as an isolated state, as in previous algorithms, thus more accurately reflecting the manner and substance of the failure of the redundant structure, The upper and lower bounds of the true failure probability of structures are calculated more accurately. The results show that the algorithm in this paper is feasible.