Download - The History_Evolution of Roof Trusses
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THE HISTORY/EVOLUTIONOF ROOF TRUSSES
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ROOF TRUSSES HAVE CHANGED QUITE A BITTHROUGHOUT THE YEARS WITH A VARIETY
OF DESIGNS OVER MANY DECADES.
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TRUSS CONSTRUCTION HAS LONG BEENASSOCIATED WITH HIGH-ENDVERNACULAR CARPENTRY.
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THE TRUSS FORM ORIGINALLY CAME OUTFROM THE TIMBER FRAMING METHODS OF
CLASSICAL ANTIQUITY IN THE MEDITERRANEAN REGION.
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FROM THE MIDDLE AGES THROUGH THE RENAISSANCE,THERE WERE A VARIETY OF LONG-SPAN ROOF SYSTEMS
USED IN BUILDING DIFFERENT STRUCTURES.
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EXCEPT FOR THE PANTHEON IN ROME,ALL ANCIENT TRUSS MEMBERS WERE MADE OUT
OF WOOD FOR NEARLY TWO MILLENNIA
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UNTIL IRON AND STEEL ROOF FRAMESSTARTED BEING MADE AT THE END
OF THE 18TH CENTURY.
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METAL WAS USED IN TRUSSESDATING BACK TO THE MIDDLE AGES,
THOUGH INCONSISTENTLY.
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WROUGHT IRON STRAPS WITH FORELOCK BOLTSWERE USED TO REINFORCE TENSION JOINERY.
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NEOCLASSICAL ARCHITECTURE FOR LARGE HALLS,ESPECIALLY IN THE AMERICANPOST-REVOLUTIONARY PERIOD
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HAD A BIG INFLUENCEOF THE SIMPLIFICATION OF TRUSS DESIGN.
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SIMPLIFICATION OF TRUSS DESIGNALSO CAME ABOUT FROM THE AVAILABILITY
OF LARGE, LONG TIMBER,
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AS WELL AS THE RISING POPULARITY OF LONG-SPANWOOD TRUSS BRIDGE CONSTRUCTION AND NEW
TECHNOLOGY IN LATE 18TH CENTURY NORTH AMERICA.
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TODAY, WOOD TRUSSES ARE STILL COMMONLY USEDTO BUILD A MULTITUDE OF STRUCTURES, INCLUDINGCHURCHES, BRIDGES, AND EVEN PRIVATE HOMES.