Scientists at Oregon State University said that much of the damage caused by tornadoes in the southern U.S. could be linked to insufficient connections between building members, specifically roof rafters, trusses and walls. Building codes are generally adequate but are not consistently enforced, the scientists note. "Time and again we've seen that such connections are often inadequate under extreme loading conditions," said Rakesh Gupta, an OSU professor of wood science and engineering.

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