Probabilistic analysis of damage accumulation with special regard to building structures stressed by collectives with higher number of cycles

在应力集体的情况下，实际损伤总和的变化取决于材料和制造性能的变化，另外还取决于用于确定损伤的miner规则的准确性。在土木工程领域，仍然通常采用1.0的极限损伤总和，在其他领域，通常采用其他极限损伤总和。在以前的dfg项目中，开发了一个完整的应力集体下损伤累积的概率概念，从woehler曲线的方差到极限损伤（D_tat）的结果方差，并依赖于使用的miner规则。在本项目中，由于试验结果仅适用于某些集体，因此通过系统计算对小范围影响参数的安全因素进行了分析。根据结果，认识到下列进一步的必要方面。有必要对桥梁、风力机等结构工程的典型参数进行分析，特别是对最大值与阈值的关系较低（∆σ_max/∆σ_D）、H值较大（R值在0 ~ 0.5之间）的组合参数进行分析。结果表明，其他主要影响参数的设计值是预期的，并根据所使用的Miner-rule进一步明确。重点分析了目标安全指标（ß_tar = 1,5…3,8）对设计值的影响。提供了以下子目标：-在寿命预测的准确性方面，具有典型结构工程的集体疲劳试验，-在概率损伤计算概念内扩展结果，特别是考虑结构工程的典型参数，-系统地分析目标安全指数对设计值的影响。

The variance oft the real damage sum in the case of stress collectives depends on the variance of material and fabrication properties and additional on the accuracy of the used Miner-rule for determination of damage. At the field of civil engineering a limit damage sum of 1.0 is still usual, at other fields other limit damage sums are usual. A complete probabilistic concept of the damage accumulation under stress collectives, from the variance of Woehler-curve to the resulting variance of the limit damage (D_tat), additional depending on the used Miner-Rule, was developed at the former DFG-project. At this project the resulting safety elements were analyzed by systematic calculations for a small range of influence parameters, because of test results were only for some collectives available. Based on the results following further necessary aspects were recognized. It’s necessary to analyze the typical parameters of structural engineering as bridges and wind turbine constructions, especially for collectives with a low relation of the maximum to the threshold stress value (∆σ_max/∆σ_D), with a high number H ̅ and also other stress relations (R ̅ between 0 and 0.5). At the result other design values of the main influence parameters were expecting, additional explicit depending on the used Miner-rule. Furthermore it is focused to analyze the influence of the targeted safety index (ß_tar = 1,5…3,8) to the design values. Following sub-goals are provided: - Fatigue tests with collectives typical for structural engineering with regard to the accuracy of life time predictions, - Extension of the results within the concept for probabilistic damage calculation with special regard to the parameters which are typical for structural engineering, - Systematic analyze of the influence of the targeted safety index to the design values.