有鋼筋截斷之RC梁耐震行為探討

Seismic behavior of RC beams with steel bar curtailment

許禎祐(Jhen-You syu)

指導教授 ： 王勇智 ； 洪崇展

國立中央大學/工學院/土木工程學系/碩士(2012年)

摘要

本實驗主要是施作符合現行規範設計之鋼筋混凝土梁，分別配置有無截斷的鋼筋在其中，進行耐震受力行為分析，討論鋼筋截斷梁受翼版的影響，以了解現今規範設計之適用性。
由實驗的結果得知，有無截斷的鋼筋之鋼筋混凝土梁在降伏載重、勁度與韌性表現相當。其破壞模式不受截斷的影響，都是由塑鉸區剝落大量混凝土的撓曲破壞。於鋼筋截斷的位置上因為有規範建議的超額箍筋保護，所以即便因翼版內的版鋼筋有貢獻，因而引入較多的剪力，也沒有對梁之鋼筋截斷處產生不良影響。

關鍵字

鋼筋截斷 ； 耐震行為 ； 梁 ； 有效版寬

並列摘要

The purpose of this study is to observe the behavior of RC beams under cycling loading, which design by standard code. The beams have slab and steel bar cut-off in beam part. Test result will check the beams bar cut-off design according to ACI standard code, but without considering slab bar effect.
From the test result, it was found that the behavior of rectangular RC beam with steel bar cut-off is similar to prototype specimen. The similarity in seismic behavior includes strength, stiffness, and ductility. Both of rectangular beams have the same failure mode at the end of the experiment, concluding as flexural failure at near the column face. This is because, according to the standard design, there are excess stirrups at the end of the steel bar cut-off. Therefore, even the T-beam specimen has extra inducel shear provided by slab bars, there is no harm to the failure mode of the T-section beam, similar to rectangular beams.

並列關鍵字

effective flange width ； Seismic behavior ； steel bar cut-off ； beam

參考文獻

[1]ACI Committee 318, Building Code Requirements for Structural Concrete, ACI 318-08 & Commentary, American Concrete Institute, 2008.

[3]Y.C. Wang, “Analytical and experimental study on seismic performance of RC T-beams with design deficiency in steel bar curtailment.” Engineering Structures, Vol. 25, pp.215-227, 2003.

[4] J. Restrepo, R. Park and A. Buchanan, “Design of connections of earthquake resisting precast reinforced concrete perimeter frames.” PCI Journal September-October: pp. 68-80, 1995.

[6] Ferguson PM, Matloob FN. “Effect of bar cutoff on bond and shear strength of reinforced concrete beams.” Journal of the American Concrete Institute, July: pp.5–23, July 1959.

[2]Standards Association of New Zealand, NZS 3101: New Zealand concrete structures standard, part 1- the design of concrete structures, part 2- commentary on the design of concrete structures. New Zealand, 2006.