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Property |
Test Information |
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Shear capacity |
The shear capacity of the "RFPI®-Joists" series was established by test as per ASTM D 5055-08a. Qualification and quality control tests were used to establish the applicable coefficient of variation, CVw, and the reliability normalization factor from Table 14.2.3.2 of CSA O86-09 was used to determine the specified strength. |
Moment capacity |
The moment capacity qualification was carried out using the analytical method in accordance with ASTM D 5055-08a. Quality control tests and qualification tests were used to establish the applicable coefficient of variation, CVw, and the reliability normalization factor from Table 14.2.3.2 of CSA O86-09 was used to determine the specified strength. |
Stiffness |
A bending test program of varying depths was used to confirm the stiffness capacity. The following formula should be used to predict mid-span deflection:
where EI = from Table 4.1.1 w = uniform load (kN/m) L = span (mm) K = shear deflection factor from Table 4.1.1. |
Creep |
The product specimens were tested for creep performance as per ASTM D 5055-08a, whereby two specimens in each I-joist series group are loaded to 1.5 times the design resistive moment capacity and the average deflection recovery must exceed 90% of the deflection between 1.5 times the total load and the basic dead load deflection (20% design). |
Bearing length |
Tests were conducted to qualify a minimum end bearing of 45 mm and 89 mm. Qualification tests were used to establish the applicable coefficient of variation, CVw, and the reliability normalization factor from Table 14.2.3.2 of CSA O86-09 was used to determine the specified strength. |
Adhesive qualification |
The web-to-web and web-to-flange joints are bonded with PRF adhesive conforming to CSA O112.9-10, "Evaluation of Adhesives for Structural Wood Products (Exterior Exposure)" (see CCMC 13522-L). The LVL flanges are bonded with PF adhesive conforming to CSA O112.6-M1977, "Phenol and Phenol-Resorcinol Resins for Wood (High-Temperature Curing)" (see CCMC 13019-L). The lumber flange end joints are glued with a melamine formaldehyde adhesive conforming to CSA O112.9-04 (see CCMC 13252-L). |