Breakout test for structural capacity of dowel pinned connections with various granite panels

초록

Although stone breakout failure governs the behavior of dowel-pinned stone connections, the mechanical properties and dimensions of the stone have not been addressed in design of dimension stone cladding. This study aimed to investigate the effects of stone properties on the structural behavior and capacity of connections by testing six types of granite with two different thicknesses. Standard breakout tests were conducted for dowel-pinned connections, considering parameters such as stone type, panel thickness, and the use of silicon injection at the dowel hole. The test results revealed that the breakout strength of the dowel-pinned connections tended to be linearly proportional to tensile-related strengths of granite as predicted by existing equations. While silicone injection at the dowel hole enhanced deformation capacity, it did not increase the breakout strength. However, with thicker stone panels, the breakout strength significantly increased by a factor of 3.05-6.43 due to deeper spall depth, resulting in a larger area of the rupture cone. Based on the breakout test results, a modified equation for the breakout strength of dowel-pinned connections, considering stone thickness, was proposed. The proposed model aligned well with the tested peak strength for both 30 mm and 50 mm thick stone panels across various material strengths.

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