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The International Building Code (IBC) offers initial direction on glass structural systems through its reference to the American Society of Civil Engineers (ASCE) standard Minimum Design Loads for Buildings and Other Structures, also known as ASCE Standard No. Structural failure affects human health, safety, and welfare (HSW) in many ways, making it the primary concern for design of glazed systems. First, the integrity of the assembly must be considered, including its performance under normal dead loads and occupancy live loads, as well as other movement-inducing loads such as wind, thermal expansion and contraction, pressure equalization, and seismic events.

Discuss key aspects of building performance affected by glass system design and construction, notably energy savings.Ĭhoosing to use glass as a component of a structural assembly-or as a load-bearing or semi-load-bearing material on its own-demands the same considerations as any structural assembly.

Detail recent advances in glazing and structural glass technology and how they contribute to a building’s energy performance.

Explain how glass is incorporated into structural systems for optimal design and environmental benefit.

List the potential structural properties of glazing and glass systems of use in commercial building and how these properties impact sustainable design.

LEARNING OBJECTIVES After reading this article, you should be able to: Toughened glass typically has four to six times the strength of annealed glass. More recently, toughened or tempered glass has become ubiquitous for frameless elements, including doors, stair treads, and load-bearing walls and floors.

Glass block, developed in the early 20th century to bring daylight into industrial buildings, is a load-bearing element treated like masonry in detailing and application. Of course, this direction is not entirely new. “When glass is load bearing it can serve three roles at once: structure, envelope, and transparency,” says Mark DuBois, a principal with Ohlhausen DuBois Architects in New York City (“There is no other way to achieve all this with one element, so it produces a truly unique experience.” For Building Teams, the notion of supporting a structure solely with glass opens up new possibilities and challenges. Underscoring this idea, two separate research teams in Europe took the idea to the extreme recently, creating composite I-beams with glass webs. Beyond the technique known as structural glazing-an umbrella term that includes spider fittings, structural silicone, and other means for attaching glass to a support structure-today there are more uses of glass as a true load-bearing element.

Long valued for its transparency and lightness, glass is now also being considered for its structural and protective capabilities. Glass has taken on new life in recent building years.