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The new method of improving stiffness by casting concrete
at the negative moment area
There are so different between maximum
magitude of positive moment and negative momente. If we design the
bridge of uniform section with negative momente, pasitive momente
area is designed very large and It's not economical. otherwise we
use the ununiform section, it is not only difficult to design, contruction
but extravagant.
In this method, To improve these
weak point, we increase the stiffness by casting concrete that advantageous
on compress in the below of both side of section at the negative
momente area and we can design the whole section in uniform section
with maximum positive momente. In these reason, We can reduce the
20% of hight compare to existing steel box section. This method
is more useful than existing continuous steel box bridge in space
of brlow structure, and reduce the material of used and advantageous
in vibration, absorbing lauance and protecting corrosion by casting
concrete.
In the existing constrction method,
It vary the thick of flange for the magitude of momete variation.
But we use the uniform section at the joint of positive and negative
momentive. We can reduce the welding and advantageous in the lateral
shear flow.
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Three-span continuous beam
under uniform distributed load. |
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Existing uniform section of
three-span continuous steel-box girder. |
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Existing ununiform section
of three-span continuous steel-box girder. |
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The new method of uniform
section of three-span continuous steel-box girder. |
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