Downtime estimation of building structures using fuzzy logic

Residential buildings are designed to withstand earthquake damage because it causes the buildings to be inhabitable for a period of time, called the downtime. This paper introduces a method to predict the downtime of buildings using a Fuzzy logic hierarchical scheme. Downtime is divided into three components: downtime due to the actual damage (DT1); downtime due to irrational delays (DT2); and downtime due to utilities disruption (DT3). DT1 is evaluated by relating the damageability of the building's components to pre-defined repair times. A rapid visual screening is proposed to acquire information about the analyzed building. This information is used through a hierarchical scheme to evaluate the building vulnerability, which is combined with a given earthquake intensity to obtain the building damageability. DT2 and DT3 are estimated using the REDi (TM) Guidelines. DT2 considers irrational components through a specific sequence, which defines the order of components repair, while DT3 depends on the site seismic hazard and on the infrastructure vulnerability. The proposed method allows to estimate downtime combining the three components above, identifying three recovery states: re-occupancy; functional recovery; and full recovery. A case study illustrating the applicability of the methodology is provided in the paper. The downtime analysis is applied to buildings with low and medium damage levels. Results from the case study show that total repair time is higher in the medium damage case, as it is expected. In both evaluations, the downtime is influenced more by irrational components and it is different in the three recovery states.

住宅建筑被设计为能够抵御地震破坏，因为地震会导致建筑物在一段时间内无法居住，这段时间被称为停工期。本文介绍了一种使用模糊逻辑层次结构方案预测建筑物停工期的方法。停工期分为三个部分：由于实际损坏导致的停工期（DT1）；由于不合理延误导致的停工期（DT2）；以及由于公共设施中断导致的停工期（DT3）。DT1是通过将建筑物构件的易损性与预先定义的修复时间相关联来评估的。提出了一种快速目视筛查方法来获取被分析建筑物的信息。通过一个层次结构方案利用这些信息来评估建筑物的脆弱性，并将其与给定的地震强度相结合以获得建筑物的易损性。DT2和DT3是使用REDi（TM）指南进行估算的。DT2通过一个特定的顺序考虑不合理的构件，该顺序定义了构件修复的顺序，而DT3取决于场地地震危险性和基础设施的脆弱性。所提出的方法能够结合上述三个部分来估算停工期，并确定三个恢复状态：重新入住；功能恢复；和完全恢复。本文提供了一个案例研究来说明该方法的适用性。停工期分析应用于低损坏程度和中等损坏程度的建筑物。案例研究的结果表明，正如预期的那样，中等损坏情况下的总修复时间更长。在这两种评估中，停工期更多地受到不合理构件的影响，并且在三个恢复状态下是不同的。