| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 84 === To assessing the structural safety, the code provisions should
be formulated by the reliability theory with the concern of the
uncertainties in materials and loads. Although the load and
resistance factors in current codes have been carefully treated
through the reliability calculations, most of the detailing
provisions are highly empirical and deterministic in form.
Therefore, further probabilistic evaluations are needed for
thoes detailing rules. This study examines the reliability of
the minimum (.blksq.) and maximum (.blksq.) steel content
requirements for reinforced concrete beams. Taking the
reliability index .beta.=3.0 as a qualified value, it is then
observed that the .blksq. in ACI 318-95 Code for the normal
strength concrete beams are reliable, but unreliable for the
high strength concrete beams. For the .blksq. of the statically
indeterminate T-section with flange in tension must be
increased about 60% to reach the amount of .blksq.=.blksq. for
just being qualified. Forthermore, the maximum steel content
requirement .blksq. .ltoreq. 0.75 .blksq. in ACI 318-95 Code is
also examined based on the Monte Carlo simulation. The .blksq.
.gtoreq. 0.6 .blksq. is suggested in this study to satisfy the
requirement of reliability index .beta. .gtoreq. 3.0.
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