鋼筋混凝土托架之剪力強度

Shear Strength of Reinforced Concrete Corbels

呂文堯(Wen-Yao Lu) ； 陳昶良(Chang-Liang Chen) ； 林英俊(Ing-Jaung Lin)

《建築學報》 69期 (2009/09) Pp. 87-98

https://doi.org/10.6377/JA.200909.0087

摘要

In this study, 24 reinforced concrete corbels with shear span-to-depth ratios greater than unity were tested. Test results indicate that the lower the shear span-to-depth ratio, the higher the shear strength of the corbel. Furthermore, the higher the compressive strength of concrete and the vertical stirrup parameter, the higher the shear strength of the corbel. An analytical model for determining the shear strength of reinforced concrete corbels with shear span-to-depth ratio greater than unity is also proposed in this paper. The shear strengths predicted by both the proposed method and the strut-and-tie model of the ACI Code are compared with the test results. The comparison shows that both the proposed method and the strut-and-tie model of the ACI Code can reasonably predict the shear strengths of reinforced concrete corbels with shear span-to-depth ratio greater than unity. For reinforced concrete corbels with shear span-to-depth ratio greater than unity, the comparison also shows that the proposed method can more accurately predict the shear strength than the approach of ACI Code.

關鍵字

鋼筋混凝土托架 ； 剪力強度 ； 對角壓力破壞

並列摘要

In this study, 24 reinforced concrete corbels with shear span-to-depth ratios greater than unity were tested. Test results indicate that the lower the shear span-to-depth ratio, the higher the shear strength of the corbel. Furthermore, the higher the compressive strength of concrete and the vertical stirrup parameter, the higher the shear strength of the corbel. An analytical model for determining the shear strength of reinforced concrete corbels with shear span-to-depth ratio greater than unity is also proposed in this paper. The shear strengths predicted by both the proposed method and the strut-and-tie model of the ACI Code are compared with the test results. The comparison shows that both the proposed method and the strut-and-tie model of the ACI Code can reasonably predict the shear strengths of reinforced concrete corbels with shear span-to-depth ratio greater than unity. For reinforced concrete corbels with shear span-to-depth ratio greater than unity, the comparison also shows that the proposed method can more accurately predict the shear strength than the approach of ACI Code.

並列關鍵字

Reinforced Concrete Corbel ； Shear Strength ； Diagonal Compression Failure

參考文獻

American Concrete Institute(2008).Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary (ACI 318R-08).MI:ACI, Farmington Hills.

Fattuhi, N. I.(1994).Reinforced corbels made with plain and fibrous concretes.ACI Structural Journal.91(5),530-536.

Fattuhi, N. I.,Hughes, B. P.(1989).Ductility of reinforced concrete corbels containing either steel fibers or stirrups.ACI Structural Journal.86(6),644-651.

Foster, S. J.,Powell, R. E.,Selim, H. S.(1996).Performance of high-strength concrete corbels.ACI Structural Journal.93(5),555-563.

Hwang, S. J.,Lee, H. J.(2002).Strength prediction for discontinuity regions failing in diagonal compressions by softened strut-and-tie model.Journal of Structural Engineering, ASCE.128(12),1519-1526.