GLASS DESIGN IN ACCORDANCE WITH THE TECHNICAL SPECIFICATION SIA 2057

Abstract

The analysis of technical specifications and drafts of parts of the future Eurocode 10 (EN19100) has resulted in the highlighting of the provisions and features necessary for the practical calculation of load-bearing structures made of single and laminated glass.

Glass components are designed for the following limit states: Serviceability Limit State (SLS), when the glass does not fracture; Ultimate Limit State (ULS), when the glass does not fracture; Fracture Limit State (FLS), during fracture; Post Fracture Limit State (PFLS), when the glass has fractured.

In addition to the classification by Consequence Classes (CC), glass components are classified into Limit State Scenarios (LSS).

The basic principles of glass design in accordance with the Swiss Technical Specification SIA 2057 and the future Swiss Standard SIA 268 are presented.

Fracture conditions are divided into five classes from 0 to 4 according to the fracture state verification (‘Nachweise im Bruchzustand’, NB): NB 0 - no additional verification; NB 1 - to be verified in a partially fractured state under its own weight; NB 2 - to be verified in a fully fractured state under its own weight; NB 3 - to be verified in a partially fractured state under its own weight and other loads: NB 3A - with one broken glass layer, NB 3B - with two broken glass layers; NB 4 - to be verified in a fully fractured state under its own weight and other loads.

SIA 2057 applies to the design of load-bearing structures and components made of glass as well as to temporary structures. It regulates the structural analysis and design of the following glass components: vertical glazing, horizontal glazing, insulating glazing, fall-protection glazing, accessible glazing, walk-on glazing, trafficable glazing, glass components subject to compressive stress (buckling), glass components subjected to bending around the strong axis (tilting).