Experimental Research on GFRP Connectors Under Combined Tension-Shear Loading for Prefabricated Sandwich Insulation Wall Panels
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摘要: 夹心保温墙体是装配式剪力墙结构的预制外墙构件。夹心墙体由内叶板、外叶板和中间保温板三层组成,连接件穿过保温板将内、外叶板连为一体。随着超低能耗建筑的推广,保温层越来越厚,连接件拉剪组合作用更加显著,但目前缺少连接件拉剪组合作用下的试验研究。为此设计了一种连接件拉剪组合受力的试验装置,并针对“+”字形截面GFRP连接件进行了拉剪组合受力试验。连接件埋深为30 mm和50 mm,保温层厚度为100 mm和200 mm,共4种构造组合。除纯拉拔试验和纯剪切试验外,还进行了拉力/剪力六种不同比例下的组合受力。试验得到了四种构造组合和八种拉力/剪力比例下的承载力、破坏形式等,通过力的归一化总结出连接件在拉剪组合受力时的破坏准则。Abstract: The sandwich insulation wall panel is a prefabricated exterior wall component of the prefabricated shear wall structure. It consists of three layers: an inner leaf plate, an outer leaf plate and a middle insulation board. Connectors pass through the insulation board to join the inner and outer leaf plates together. As ultra-low energy buildings are being promoted, their insulation layers have become thicker, and the combined tension-shear effect of the connectors has become increasingly prominent. However, there is a lack of experimental research on the mechanical properties of connectors under combined tension-shear loading. In this paper, a test device for simulating the combined tension-shear combined force on connectors was designed, and combined tension-shear loading tests were conducted on GFRP connectors with a "+" cross-section. Four structural combinations were set with the connector embedment depth of 30 mm and 50 mm, and the insulation layer thickness of 100 mm and 200 mm, respectively. In addition to the pull-out and shear tests, this study also included tests under six different tension-shear ratios. The bearing capacity, failure modes and other mechanical properties of the connectors under four structural combinations and eight different tension-shear ratios were obtained. Furthermore, by normalizing the applied forces, the failure criteria for the connectors under combined tension-shear loading were summarized.
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