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Structural glazing sealant in the safety factor and the sash is kind of how?
Class:News Date:2016-4-27 10:44:37
When structural sealant assembly first enters the building industry, only high modulus silicone products can be used. This sealant has a special recipe and technical requirements, and provides total "safety factor" in structural applications. Design is based on the overall size of the glass sheet, the width and depth of the calculated wind loads developed seam. Then, and only high modulus sealant to meet safety factor standards.
"Safety factor" in the definition of the term structure of the assembly for the sealant ultimate strength (usually expressed in tensile strength) and the ratio of the most common design stress 20psi. Since the structural assembly applications have proven 5: 1 and 6: 1 ratio is sufficient and has become the most common factor of safety regulations.
Due to the structure of the assembly and reliability of the various variables of engineering materials and other factors, the higher the safety factor, the system can withstand the greater the error. Today, the safety factor has been considered too high. After many years of different manufacturers and laboratories detected at the site, there is the use of softer factor of 2: 1, material trend. These modulus or low modulus sealant on most surfaces can have better adhesion, and allow greater movement between the glass and frame structure. This capability is hoped to have the building in the earthquake motion.
In general, high modulus silicone sealants used in structural glazing. But if we consider the unusual circumstances of displacement, we recommend the use of a low modulus silicone sealant. These sealants have ± 50% of the continuous extension and compression ratio, high modulus sealant around twice. Before selecting structural glazing sealant, the manufacturer should consult the relevant structural sealant recommendations. Practical safety factor curtain wall structural components and fasteners used is 1.5: 1. If the safety factor for the design stress of 20 psi sealant, then sealant ultimate strength should be 30 psi.