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The
method applied to the architectural structures with preflex beam
This method places simple preflex
beam on the both columns and passes main reinforcing bar of column
through lower and upper flange punched. if the structure is one
story, prestressed steel bar is installed between anchor installed
in bottom slab and upper flange on the center of beam, and prestressed
steel bar tensed by oil jack on the center of beam. In case of more
than two story, prestressed steel bar passes through between each
beam, in means of same method prestressed steel bar tensed. In this
way introducing positive moment to the middle of beam, two preflex
beam is continued by welding of cover plate. After bottom slab and
column of upper story is placed and cured, prestressed steel bar
is removed, then introduced compressive force can reduce the tension
by dead and live load. It may be changeable according to conditions
of site and loads when each beam is connected by welding cover plate.
Reducing enormous negative moment
in joint of beam-column, this method can reduce a water leakage
by the cracks near joint so can improve durability of structure.
Because height of beam and area of column can be reduced, the cost
of material can be lower and efficiency of space can be improved.
Moreover, reduction of self-load and continuity can improve resistance
of earthquake. As a result, this can be applied preflex beam and
existing structures which use a rolled profile.
Column of Reinforecd concrete
and column of steel composite |
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To place preflex beam over
column of Reinforecd concrete and column of steel
composite |
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Column of Reinforecd concrete
and column of steel composite |
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To place preflex beam over
column of Reinforecd concrete and column of steel
composite |
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Applying preflexion on first
floor |
Applying preflexion on second
floor |
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The detail of connection between
preflex beam and diaphragm on RC column |
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The cubic detail of connection
between preflex beam and diaphragm on RC column |
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The cubic detail of connection
between preflex beam and diaphragm on steel composite
column |
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Placing concrete on slab and
top of column. And moment diagram |
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The unloading of preflexion
and moment diagram |
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