Abstract
A total of 220 four-point quasi-static bending tests were performed on 3.66 m and 6.10 m long wood I-joists. In addition to control specimens, two different notch sizes (100 × 100 mm and 100 × 150 mm) at three different locations (305, 455 and 610 mm from the support) and two Oriented Strand Board (OSB) collar reinforcements were considered to evaluate their impact on failure mode, stiffness, and load-carrying capacity. While the joist from the control series without notch failed in flexure, the notched I-joists failed mostly in combined flexure-shear failure. It was found that the reduction in capacity and stiffness increases with the increase in notch depth and notch distance from support. Reinforcing the I-joists with OSB collars at the notch prevented brittle shear failure and improved capacity compared to the unreinforced I-joists. Regression models were proposed to estimate the capacity of unreinforced and reinforced I-joists with flange notches. By conducting a sensitivity analysis, it was found that the I-joist aspect ratio, notch depth, notch location and reinforcement type have a significant impact on the capacity of reinforced I-joists.
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