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What (who) is stressing abutments - definition
Stressing
Rail stressing
Stressing is a rail engineering process. It is used to prevent heat and cold tension after installation of continuous welded rail (CWR).
Abutment
![rail bridge]] and earthen fill of the bridge approach embankment at Old Town Station Staten Island Railway - Staten Island, New York](https://commons.wikimedia.org/wiki/Special:FilePath/Old Town Road SIRT SB stair jeh.jpg?width=200 "rail bridge]] and earthen fill of the bridge approach embankment at Old Town Station Staten Island Railway - Staten Island, New York")
![Brick abutment supporting disused tramway over the [[Yass River]] in [[Yass, New South Wales]]](https://commons.wikimedia.org/wiki/Special:FilePath/Railway bridge abutment riverbank park yass.JPG?width=200 "Brick abutment supporting disused tramway over the [[Yass River]] in [[Yass, New South Wales]]")
SUBSTRUCTURE AT THE ENDS OF A BRIDGE SPAN OR DAM SUPPORTING ITS SUPERSTRUCTURE
Abutments; Bridge abutments; Bridge abutment
An abutment is the substructure at the ends of a bridge span or dam supporting its superstructure. Single-span bridges have abutments at each end which provide vertical and lateral support for the span, as well as acting as retaining walls to resist lateral movement of the earthen fill of the bridge approach.
Abutment
SUBSTRUCTURE AT THE ENDS OF A BRIDGE SPAN OR DAM SUPPORTING ITS SUPERSTRUCTURE
Abutments; Bridge abutments; Bridge abutment
·noun State of abutting.
II. Abutment ·noun That on or against which a body abuts or presses.
III. Abutment ·noun In breech-loading firearms, the block behind the barrel which receives the pressure due to recoil.
IV. Abutment ·noun The solid part of a pier or wall, ·etc., which receives the thrust or lateral pressure of an arch, vault, or strut.
V. Abutment ·noun A fixed point or surface from which resistance or reaction is obtained, as the cylinder head of a steam engine, the fulcrum of a lever, ·etc.
Wikipedia
Rail stressing
Stressing is a rail engineering process. It is used to prevent heat and cold tension after installation of continuous welded rail (CWR). Environmental heat causes CWR to expand and therefore can cause the fixed track to buckle. Environmental cold can lead to the contraction of the fixed railway track causing brittleness and cracks. Before it is installed, the rail is altered by stretching with hydraulic tensors or heated to its stress-free temperature to make these dangerous problems less likely.
