examples of arches
				   		The concept of the arch varies in relation to the way it absorbs and transfers the roadway’s weight to its support points.
				
 
					
					
					
						three-hinged arch 
						Arch with three roller joints: one at each end and one at the center.
				  	
 
					
						two-hinged arch 
						Arch whose ends rest on an abutment attached by a roller joint.
				  	
 
					
						fixed arch 
						Nonarticulated arch, embedded in each of its supports.