| Summary: | 碩士 === 朝陽科技大學 === 營建工程系碩士班 === 97 === To date, most research works dealing with RC member behavior mainly
focus on the laboratory specimen size. In particular, rare research addressed
on the behavior of full-scaled reinforced lightweight concrete. It seems valid
and necessary to engage on more studies of full size specimen tests, which
will be helpful for the design work in practice. More information about the
flexural behaviors of reinforced lightweight concrete should be understood
and supplemented.
The experimental program in this research mainly investigates the
flexural behaviors of reinforced concrete beam. Third-point bend test was
performed wit the beam dimension of 25 cm * 40 cm * 400 cm were used.
The beams were designed with three rebar contents ratios. The test results
showed that the reinforced lightweight concrete has similar load capacities
and failure types as those of reinforced normal concrete. However,
lightweight concrete seems to perform larger curvature and ductility. From
the failure patterns of the beams, it can be observed that the cracks on
lightweight concrete beam appears fewer and less-spread, This can be
attributed to the low strength of lightweight aggregate that the crack direct
penetration aggregate; however, the cracks turn out wide-spread over the
normal concrete beam surface. In addition, it is also found that the current
formula in ACI Code to predict the deflection of RC member in flexure is
only valid for those members subject to a load before yielding and is invalid
to use it for after yielding load.
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