Study on Shear Mechanical Properties and Calculation Model of Sealing Adhesives for Ultra-low Energy Consumption Buildings

Abstract:

In order to study the shear mechanical properties of ultra-low energy building sealants, a monotonic loading test was conducted using a single-axis testing machine on the sealant layer. [JP+1]The influence laws of the thickness, width of the sealant layer and the elastic modulus of the sealant on the shear performance of the sealant were analyzed, and a shear stress calculation model at the sealant layer was established. The results showed that the failure types of the specimens mainly included the failure of the bonding interface and the shear failure of the sealant layer. Under the same strain conditions, the shear stress of the sealant was negatively correlated with the thickness of the sealant layer and positively correlated with the width of the sealant layer. An internal force calculation model applicable to the sealing glue between joints of ultra-low energy buildings, which is mainly shear-driven and the normal stress can be ignored, was proposed. The calculated values were basically consistent with the experimental values.