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An experimental study was conducted to assess the serviceability and ultimate limit state behavior of a fully glazed architectural laminated glass system under accelerated weathering conditions. Glazed specimens included heat-strengthened laminated glass with a low-emissivity, metallic solar coating on one glass surface next to the polyvinyl butyral interlayer. The laminated glass units were anchored to the aluminum curtain wall frame with a perimeter anchor bead of medium-modulus structural silicone sealant. Accelerated weathering was performed in a manner similar to the provisions of ASTM E773-88 and E774-92. All specimens (weathered and unweathered) were then subjected to a severe windstorm simulation test, i.e., windborne missile impacts followed by an extensive positive/negative pressure spectrum. Results indicated that the accelerated weathering had demonstrable effects on both the PVB laminated glass and the structural silicone anchor bead. However, complete resistance to glass fallout during the pressure spectrum was achieved when the inboard glass ply remained unbroken after completion of the windborne missile impacts.
accelerated weathering, architectural glazing, durability, laminated glass, silicone sealant, structural glazing, wind resistance
Associate Professor, Civil Engineering and Senior Investigator at the Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, MO
Research Professor, the Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, MO
Research Assistant, Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, MO