A hammerbeam is a form of timber roof truss allowing a hammerbeam roof to span greater than the length of any individual piece of timber in place of a normal tie beam spanning the entire width of the roof short beams the hammer beams are supported by curved braces from the wall and hammer posts or arch braces are built on top to support the rafters and typically a collar beam. Is to work as a stiff beam which simply reduces the lateral deflection thrust in the top chord rafter and subsequently reduces the thrust and moment in the top of the wall. This thesis is about late medieval carpenters their techniques and their art and about the structure that became the fusion of their technical virtuosity and artistic creativity. 
				
			
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