| Summary: | 碩士 === 國立交通大學 === 土木工程學系 === 84 === This experimental research is conducted to investigate the
behavior and load-carring capacity of steel reinforced
concrete (SRC) columns which are the type of concrete-encased
steel columns. Ten specimens are fabricated and testedunder pure
axial load. Parameters such as the shape of steel section,
contents of steel, spacing of lateral tie, contents of tie and
shape of tie, are studiedfor the effect on behavior and
capacity, such as ultimate strength, effect of confienment and
post-failer strength.
Test results show that the specimens behave linearly at the
beginning of the test and , then, nonlinearly until reaching
the ultimate strength. Concrete cover begins to spall
and the buckling of the rebars as well as the fracture of the
ties or the failure of anchorage are followed.
The small spacing of ties can enhance the effect of confinement.
Steel of cross shape behaves well after reaching peak-load and
has a higher residual strength. Compared to quadrangled ties,
octagonal ties can effectively improve the post-failure strength
and avoid the loss of post-failure strength caused by
unsuitable steel shape or large spacing of ties. With the
decreasing of tie spacing, octagonal tie works more effectively.
Based on test results, theoretically develop the procedure to
estimate the concrete compressive strength for the concrete
highly confined by steel shape. The calculation of axial
strength of SRC columns considering the confined concrete
compressive strength can predict well.
|
|---|
