Experimental Research on GFRP Connectors Under Combined Tension-Shear Loading for Prefabricated Sandwich Insulation Wall Panels

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.