Standard Practice for Determining the Resistance of Single Glazed Annealed Architectural Flat Glass to Thermal Loadings

Importancia y uso:

5.1 Use of this practice assumes:

5.1.1 the glass edges shall be free from damage,

5.1.2 the glass shall be properly glazed,

5.1.3 the glass shall not have been subjected to abuse, and

5.1.4 the glass edge support allows in-plane movement of the glass due to thermal expansion and contraction.

5.2 This practice does not address all factors that cause thermally induced stresses in annealed glass. Factors that are not addressed include: transient thermal stresses, HVAC registers, thermally insulating window coverings, drop ceilings and other heat traps, increased solar irradiance caused by exterior reflections, variations in heat transfer coefficients other than those assumed for the steady state analysis described herein, and stresses induced by thermal sources other than the sun. Factors other than those listed above may also induce thermal stress.

5.3 Many other factors shall be considered in glass selection. These factors include, but are not limited to, mechanically induced stresses, wind effects, windborne debris impacts, excessive deflections, seismic effects, heat flow, noise abatement, potential post-breakage consequences, and so forth. In addition, considerations set forth in building codes along with criteria presented in safety glazing standards and site specific concerns may control the ultimate glass type and thickness selection.

5.4 The proper use of this practice is intended to reduce the risk of thermally induced breakage of annealed window glass in buildings.

Subcomité:

E06.52

Referida por:

C1401-23

Volúmen:

04.12

Número ICS:

81.040.20 (Glass in building)

Palabras clave:

annealed glass; flat glass; glass; thermal breakage; thermal load; thermal stress; soda-lime silica glass;