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Durability and the factor method of ISO 15686-1

机译：ISO 15686-1的耐用性和系数方法

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摘要

Interest in the service life of buildings and components and the future need for maintenance is growing, and the methodology for service life planning is starting to appear in standards. The standard ISO 15686 prescribes a factor methodology for deciding about the expected service life of a component with a prescribed probability of earlier failure. The methodology is based on extensive knowledge about materials and building technology, and examples of the use of this methodology on building components are of value for the discussion on service life planning. Results from a condition survey of timber windows are used to define the service life and effect of the factor method in the Standard. Wood is a very variable material, and for wooden windows maintenance plays a key role in the durability of the component. In this instance, condition assessment is, therefore, not sufficient to estimate the service life. Information about former maintenance and refurbishment is also needed. The results from a condition assessment and the house owner's answers to a questionnaire are combined to evaluate the estimated service life of the windows. The factors for the standardized method for estimating service life with a given confidence limit are shown to have a wide range in values that give considerable uncertainty to the practical use of the standardized methodology. For example, it is shown that the estimated service life with an 80% confidence limit is much lower than the average service life. Thus, the question is posed whether there is any meaning in estimating the lower limit of service life.
机译：人们对建筑物和组件的使用寿命以及未来的维护需求越来越感兴趣，并且使用寿命计划的方法已开始出现在标准中。 ISO 15686标准规定了一种因素方法，用于确定具有规定的较早故障概率的组件的预期使用寿命。该方法基于对材料和建筑技术的广泛了解，在建筑构件上使用此方法的示例对于使用寿命规划的讨论具有价值。木材窗户状况调查的结果用于定义标准中因子方法的使用寿命和效果。木材是一种非常易变的材料，对于木质窗户来说，维护在组件的耐用性中起着关键作用。因此，在这种情况下，状态评估不足以估计使用寿命。还需要有关以前的维护和翻新的信息。条件评估的结果与房主对问卷的回答相结合，以评估窗户的估计使用寿命。在给定的置信度极限下估算使用寿命的标准化方法的因素显示，其取值范围很广，这给标准化方法的实际使用带来了很大的不确定性。例如，表明具有80％置信度限制的估计使用寿命远低于平均使用寿命。因此，提出了一个问题，即估计使用寿命的下限是否有任何意义。

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