To design a curtain wall project with a specified reliability level, the content should run through the whole process and all aspects of pre-research, analysis, design, manufacturing, test, installation, operation and maintenance of the product.
Curtain wall reliability engineering includes reliability analysis, prediction and evaluation, reliability design, reliability management, reliability production, reliability maintenance, reliability test, reliability data collection, processing and exchange, etc. From the design of the product to the life cycle of the decommissioning of the product, every step can be included in the reliability engineering.
The traditional architectural physical properties of curtain wall are deterministic, repeatable, measurable and visible, and can be obtained by applying traditional scientific knowledge. The reliability is different from the traditional curtain wall physical performance in that it is uncertain and random, and the situation that occurs at the same time cannot be repeated. The truth value cannot be predicted or directly seen, so only traditional scientific knowledge can explore and deduce its uncertainty.
At the beginning of modern curtain wall use, the failure rate of the product is high, and has the characteristics of rapid decline. The faults in this stage are mainly defects in design and manufacturing, such as improper design, material defects, processing defects, improper installation and adjustment, etc., which are easily and quickly exposed after curtain wall is put into use. Early failure can be reduced or even eliminated by strengthening quality management and adopting special reliability test. The initial failure mainly occurs during the warranty period.
After the frameless curtain wall is put into use for a period of time, the failure rate will drop to a low level and basically remain in a stable and stable state. It can be approximated that the failure rate is a constant. The failure in this period is mainly caused by accidental factors, and the accidental failure period mainly refers to the design life of the curtain wall.
In the middle and late period of curtain wall's service life, it will enter the period of depletion and failure, which is characterized by the rapid increase of failure rate with time, and the rapid increase of product failure until the final scrap. This stage of failure is mainly caused by aging, fatigue, wear, corrosion and other consumptive factors.
Reliability work is to change this three-stage bathtub curve, that is, to minimize and eliminate early failures, to prolong the accidental failure period and reduce the accidental failure rate as much as possible. The purpose of reliability research for office curtain wall is to eliminate and reduce the early failure rate - to reduce defects in design and material itself, processing and installation.
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Post time: Sep-25-2023