tie-beam

tie beam

noun
a horizontal timber or the like for connecting two structural members to keep them from spreading apart, as a beam connecting the feet of two principal rafters in a roof truss.

Origin:
1815–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tie beam
 
n
a horizontal beam that serves to prevent two other structural members from separating, esp one that connects two corresponding rafters in a roof or roof truss

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