超低能耗建筑密封胶抗剪力学性能试验和计算模型研究

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

摘要:

为了研究超低能耗建筑密封胶的抗剪力学性能,通过万能试验机对密封胶层施加单调加载,分析胶层厚度、胶层宽度和密封胶弹性模量对密封胶剪切性能的影响规律,并建立胶层处剪切应力计算模型。结果表明,试件的破坏类型主要分为胶接界面破坏和胶层剪切破坏。在相同应变条件下,密封胶的剪切应力与胶层厚度呈负相关,而与胶层宽度呈正相关。提出了适用于以剪切为主、正应力可忽略的超低能耗建筑缝间密封胶的内力计算模型,计算值与试验值结果基本吻合。

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.