The influence of green structures of blue infrastructure on the load of building structures

The paper considers the place of green structures in the blue infrastructure of cities. A scheme of integrated rainwater management using green structures is built. The combination of different green structures allows to creation of a unified and effective rainwater management system. The impact of green building structures on their supporting structures plays an important role. The loads from green roofs have two components: the load from structural elements and plants, including wind loads, and the load from precipitation-retained rainwater and snow. The first group of loads is constant, except for periodic wind loads, but its peak values vary little during rain and snow. It is impractical to consider snow load management. It can be reduced by snow removal. However, this will lead to a high risk of improper performance of snow removal duties with overloading of the supporting structures. Therefore, for safety reasons, the calculation is based on the maximum load. The load from rainwater depends on the runoff coefficient, which can be changed. Therefore, the paper underestimates the snow load for different snowy regions and average recurrence periods. The critical water retention of rainwater with the same load as the snow cover was determined. In the worst-case scenario of the first snow region and an average recurrence period of 10 years, we have a critical water retention of 56.2 dm3/m2, which is significantly higher than the intensity of precipitation. This means that the load of retained rainwater will be less than that of snow. Therefore, it’s necessary to ensure maximum water retention by the amount of precipitation. This cannot affect the bearing capacity of structures, which will be determined by the snow load. The possibility of utilising melt water for household needs is shown. The tasks for future research have been set.