A new generation of umbrella-shaped netting is increasingly being used as avalanche barriers in subordinate areas and as a protective measure against sliding snow. These so-called umbrella nets are attached to just one fixed point on the mountain side. The system offers a high degree of flexibility and is therefore of interest as a potential avalanche protection measure for special ÖBB applications.

Several installed umbrella nets have shown damage due to overloading. This raises the question of which typical damage patterns occur in the structure and what types and magnitudes of loads cause them. How can such damage be prevented? Additionally, it is essential to determine the required maintenance and repair measures, as well as the expected lifespan of the system.

Analysis of damage to existing structures

The goal of this project is to document and analyze damage to existing structures, with a focus on determining whether the damage results from deficiencies in structural design. In addition to damage analysis, a method will be developed to reduce and ideally prevent such damage. A test site has already been established in Axamer Lizum, where forces acting on various structural components of the umbrella nets are being recorded.

Creating guidelines for dimensioning

Based on the collected data and comparisons with ongoing measurements from other net structures, a guideline will be developed. This guideline will provide recommendations for the dimensioning of umbrella nets concerning snow load. Additionally, the findings will help identify and suggest possible applications for umbrella-shaped net constructions.

Term: 01.10.2022 – 31.12.2026

Client:

ÖBB-Infrastruktur AG, Geschäftsbereich SAE, Fachbereich Fahrwegtechnik Geotechnik und Naturgefahrenmanagement; Forsttechnischer Dienst der Wildbach- und Lawinenverbauung (WLV), Sektion Tirol