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Light Gauge Steel Reinforcement for Improperly Cut I-joists

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  054122,  2005 ASAE Annual Meeting . (doi: 10.13031/2013.19907) @2005
Authors:   Daniel P. Hindman, Joseph R. Loferski
Keywords:   I-joist, Flange Reinforcement, Web Reinforcement

One of the biggest problems with the use of wood composite I-joist products are issues related to improper installation. There are restrictions on the size of holes which can be placed in the web of the I-joist while the flange of the I-joists must remain uncut. However, these instructions are not always explicitly followed on the construction site. When errors are made, such as placing a toilet drain directly over an I-joist, the resulting solution is difficult and complex, requiring engineering expertise. Two new light gauge steel reinforcement devices have been developed to increase the bending capacity of I-joists which have been cut in the web and flange, respectively. These devices were tested to determine the bending strength and stiffness compared to uncut joists. The flange reinforcer had a maximum load 35.4% less than the uncut joist, the single web reinforcer had a maximum load 19.1% less than the uncut joist and the double web reinforcer had a maximum load greater than the uncut joists. Looking at the loads at the L/360 deflection limit, the flange reinforcer load was 10% less than the uncut joist, while both web reinforcers were greater than the uncut joist.

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