If a deformation of steel due to
load returns in original state as a load deletes, it is said to
linear and elastic behavior. However, when the load is reduced, the
strain decreases along an almost unloading line CD which is parallel
to the initially linear region of curve. When the load is again zero
at the end of unloading, the strain is not zero ; there remains a
residual strain AD. The irrecoverable strain AD is referred to as
plastic strain while the recoverable strain CE is the elastic
strain. The graph follows.
The advantage of this method fellows.
Other methods consider only elastic
area and pre-camber according to design dead load. but these
methods very inconvenient and difficult. while our method considers
plastic and elastic area so initially H-beam is cambered by pre-loading
over elastic area. existing method makes use of a fixed support
so very inconvenient, while our method chooses simple support, so
this is very useful. this method can be applied simple and continuous
The stress of generally structural
Process of manufacturing preflex composite beam using plastic
deformation of rolled profile
Most of all, a beam is connected
by prestressed steel bar in both ends of beam and by plastic loading
in both quarters of beam, plastic deformation appears. after beams
are turned over, in same course, support is connected by PS bar.
moreover by loading in both quarters of beam, the beams are
made straight then low casing concrete is placed and cured. finally
by unloading low flange casing concrete is introduced prestress.
this is method of manufacturing preflex composite beam.
Plastic deformation process
The plastic deformation of
manufacturing H-shape preflex composite beam
Process of manufacturing preflex
process of manufacturing H-shape
plastically deformated preflex composite beam