高拉力鋼筋混凝土梁鋼筋截斷設計之研究

歐陽文浩

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高拉力鋼筋混凝土梁鋼筋截斷設計之研究

he Study on the Rebar Cut-off Design for New RC Beams using High Strength Steel Reinforcement

歐陽文浩 , Masters　　Advisor：王勇智　　

繁體中文

梁；高拉力鋼筋；鋼筋截斷；耐震行為；拉力外移； New RC beams ； high strength steel reinforcement ； rebar cut-off ； seismic behavior ； tension shift

Abstract │ Reference (8) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

In the research, five reinforced concrete beams with high strength steel reinforcement are tested by cyclic loadings to observe their seismic performance and to verify the availability of the recent ACI 318 code on the high strength rebar cut-off design.
The original concrete strength 40 MPa was adopted for the testing whereas the concrete cylindrical strength was measured up to 55 MPa. The difference of the concrete strength could influence the design for the rebar cut-off length. For all the five tested beams, 3-#8 bars are placed on the top and on the bottom of the beam section, respectively. One beam belonged to normal RC beam with SD420 #8 beam bars, different from the rest of four beams belonged to New RC beams with SD685 #8 bars. The yielding strength of the transverse reinforcement for all the tested beams is 420 MPa. Two beams including the normal RC are not curtailed for comparison. As for the three curtailed beams, one beam is curtailed adopted from ACI318-11 building code, and other two are revised from the original design. That is the yielding strength in the ACI empirical equation of the development length is replaced by taking 1.25 times the nominal yield strength of the steel reinforcement.
According to the result, the diagonal flexure-shear cracks cause the effect of the tension shift of the high strength steel reinforcement severe. Thus, it causes the rebar development length increase. This effect shall be cared when the steel reinforcement curtailment is considered. It is suggested that 1.25 times the nominal yield strength of the beam longitudinal bars might take into account when the development length of steel reinforcement was evaluated.

Reference ( 8 ) 〈TOP〉

[1]ACI Committee 318, Building Code Requirement for Structural Concrete, ACI318-11 & Commentary, American Concrete Institute, 2011.
連結：
[4]Y.C. Wang , “Analytical and Experimental Study on Seismic Performance of RC T-beams with Design Deficiency in Steel Bar Curtailment ”Engineering Structure, vol. 25, 2003, pp. 215-227.
連結：
[6]許禎祐，「有鋼筋截斷之RC梁耐震行為探討」，國立中央大學，碩士論文，民國一百零一年。
連結：
[2]中國土木水利工程學會，混凝土工程設計規範與解說，土木401-100，2011。
[3]T, Paulay, and M.J.N., Priestley, Seismic Design of Reinforced Concrete and Masonry Building, John Wiley & Sons, New York, 1992.

Times Cited (1) 〈TOP〉

王偉軒(2014)。受震鋼筋混凝土之鋼筋截斷設計研究。中央大學土木工程學系學位論文。2014。1-131。

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