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From [Institution name]
Property |
Test Information |
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Shear capacity |
The shear capacity of the product was established by computing the shear capacity for each depth separately as per ASTM D 5055-04. Qualification tests were used to establish the applicable coefficient of variation, CVw, and the reliability normalization factor from 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 5055-04. At least 10 specimens of each joist depth were tested to verify the actual capacity versus the design capacity. Qualification tests were used to establish the applicable coefficient of variation, CVw, and the reliability normalization factor from 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 was used to predict mid-span deflection:
where EI = shear-free EI from Table 4.1.1, w = uniform load (kN/m), L = span (mm), K = shear deflection factor from Table 4.1.1. |
End joints |
End joints were qualified as part of the flange tension qualification. The flanges are finger-jointed in plant, and regular tension testing is conducted. |
Creep |
Product specimens were tested for creep performance as per ASTM D 5055-04, whereby two specimens from each I-joist series group are loaded to 1.5 times the design resistive moment capacity where the average deflection recovery must exceed 90%. |
Bearing length |
The design values on end bearing and intermediate reaction were analyzed using the procedure in ASTM D 5055-08 whereby linear interpolation was used to establish reaction capacities within the tested bounds of depth and bearing length. A minimum of 10 specimens were tested for four bearing lengths at I-joist extreme depths. Qualification tests were used to establish the applicable coefficient of variation, CVw, and the reliability normalization factor from CSA O86 was used to determine the specified strength. |
Adhesive qualification |
The flange-to-flange finger joint is adhered with a polyurethane adhesive (see CCMC 13512-L); web-to-web and web-to-flange joints are bonded with a phenol-resorcinol formaldehyde adhesive complying with CSA O112.7-M1977, "Resorcinol and Phenol-Resorcinol Resin Adhesives for Wood (Room- and Intermediate-Temperature Curing)" (see CCMC 13054-L). |