多种随机载荷下的结构动态可靠性计算

Structural dynamic reliability calculation under three types of stochastic loads

考虑随机载荷的加载形式分为动载荷累加,等幅且服从参数为λt的泊松分布,和载荷随时间变化且不服从任何分布的三种情况,利用应力-强度干涉理论和随机过程理论分别建立了结构强度退化情况下的结构动态可靠性预测的三种计算公式。该公式形式简单、便于计算,且可获得结构的可靠度随时间变化的规律。最后通过算例说明该计算公式的合理性,可行性,实用性。

Stochastic loads were classified into three types of dynamic load accumulation, the one with equal amplitude and obeying Poisson distribution with a parameter of At and the one changing with time and not obeying any distribution. Under these three conditions, structural dynamic reliability computing formulas were established in cases of structural strength without degeneration and that with degeneration by using the stress-strength interference theory and the stochastic process theory. It was shown that the reliability of a structure is Finally, three numerical examples were presented to illustrate the proposed gradually reduced with time, not unchanged formulas are correct, feasible and practicable.