结构动态非概率可靠性预测模型

Model for prediction of structural dynamic non-probabilistic reliability

研究了当载荷区间变量随时间变化且结构强度区间变量随时间退化情况下的结构动态非概率可靠性问题,给出了结构强度退化的变化区间及其均值、离差的计算表达式;根据应力-强度干涉理论和区间理论,建立了在结构强度随时间退化时,结构所承受的载荷分别为阶梯型、等幅交变型和任意时变型3种情况下的结构动态非概率可靠性预测模型,并通过3个算例说明文中所建模型的合理性.

The structural dynamic non-probabilistic reliability under the interval variable of loads changing over time and the interval variable of structural strength degrading over time is studied.The formulas for the change interval of structural strength degradation and its mean value and deviation are shown.According to the stress-strength interference theory and the interval theory,the structural dynamic reliability prediction model are established under the structural strength degradation over time while the loads of the structure bearing are classified three cases loads： ladder type,constant amplitude alternating type and random changing over time type.Finally,three examples are used to illustrate that the structural dynamic reliability models are reasonable and feasible.