Experimental Study on the Mechanical Properties of Drilled Wooden Beams under Different Diameter-to-Height Ratios
Due to the requirements for pipeline layout,wooden structural buildings often have drilled holes in their components,especially in glulam beams with low shear span-to-depth ratio,which significantly affect the mechanical properties of the beams.Ex-perimental research is conducted for different diameter-to-height ratios,and the results indicate that drilled holes cause additional transverse tensile and compressive stresses in wooden beams,forcing lateral cracks to form around the holes at approximately 45°.The specimens with diameter-to-height ratios of 0.15,0.30 and 0.45,when compared to beams without holes,exhibit a decrease in ultimate load capacity by 3.87％,29.03％and 41.94％respectively;the reductions in ultimate displacement are 6.98％,30.77％and 33.48％respectively;and the reductions in apparent modulus of elasticity are 0.53％,6.81％and 19.34％respectively.The research further reveals the influence patterns of drilling on the mechanical performance of glulam beams with low shear span-to-depth ratio.
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