Based on the traditional Nielsen model, a unified failure model on the uniformly reinforced concrete
box section members under combined forces was introduced by Luo and Liu. One of their contributions is
adjustment of the shear carrying capacity of concrete at the member failure surface. In the unified failure model,
the comparison with the experimental results verified this adjustment. Nevertheless, it should be pointed out that
the adjustment factor of shear carrying capacity at member failure surface for the reinforced concrete members in
the unified failure model is a fixed adjustment constant for all experiment data, which is basically determined by
curve fitting. However, the adjustment factor should vary with the normal stress at the member failure surface. In
this paper, an advanced theoretical model is introduced, in which the adjustment factor of shear carrying capacity
at failure surface is a variable related to the normal stress at failure surface. Furthermore, the advanced unified
failure model on the uniformly reinforced concrete box section member can still be expressed in a simple form.
Finally, the comparison with several groups of test data has verified that this advanced model is more accurate
and feasible to be used in design.
LUO Hua-xun* (骆华勋), LIU Xi-la (刘西拉)
. Advanced Unified Failure Model on Uniformly Reinforced Concrete Box Section Members[J]. Journal of Shanghai Jiaotong University(Science), 2013
, 18(5)
: 563
-569
.
DOI: 10.1007/s12204-013-1440-z
[1] Guan Pin-wu, Xu Ze-jing, WANG Bo. Shear capacity analysis methods of R.C. members [J]. World Earthquake Engineering, 2002, 18(3): 95-101 (in Chinese).
[2] Hsu T T C. Softened truss model theory for shear and torsion [J]. ACI Structural Journal, 1988, 85(6): 624-635.
[3] Hsu T T C. Toward a unified nomenclature for reinforced-concrete theory [J]. Journal of Structural Engineering, 1996, 122(3): 275-283.
[4] Hsu T T C. Unified approach to shear analysis and design [J]. Cement and Concrete Composites, 1998, 20(6): 419-435.
[5] Hsu T T C. Unified theory of reinforced concrete [M]. Boca Raton, FL: CRC Press, 1993.
[6] Liu Xi-la. The development and prospect of structural engineering [M]. Beijing: China Architecture & Building Press, 2007 (in Chinese).
[7] Pang X B, Hsu T T C. Fixed angle softened truss model for reinforced concrete [J]. ACI Structural Journal, 1996, 93(2): 197-207.
[8] Zhu Bo-fang. Finite element method theory and applications [M]. Beijing: China Water & Power Press, 1998 (in Chinese).
[9] Nielsen M P, Hoang L G. Limit analysis and concrete plasticity [M]. Englewood Cliffs, NJ: Prentice-Hall, 1984.
[10] LuoHX, Liu X L. New unified failure model on evenly distributed reinforced concrete members with box section [J]. Journal of Shanghai Jiaotong University (Science), 2013, 18(1): 76-83.
[11] Chen W F. Constitutive equations for materials of concrete and soil [M]. Beijing: China Architecture & Building Press, 2004.
[12] Huang Z, Liu X L, Yang G. Unified expression for failure of reinforced concrete members in bridge [J]. Journal of Zhejiang University: Science A, 2006, 7(3): 383-390.
[13] Huo Jing-feng. Unified failure expression on the reinforced concrete members [D]. Shanghai: Department of Civil Engineering, Shanghai Jiaotong University, 2004 (in Chinese).
[14] Luo Hua-xun, Liu Xi-la. Unified failure model on the reinforced concrete members with box section [J]. Sichuan Building Science, 2011, 37(1): 1-6 (in Chinese).
[15] Li Zhi-jun. The experimental study on torsional behavior of R.C. members with box sections subjected biaxially to eccentric compression and shear [D]. Xi’an: Department of Civil Engineering, Xi’an University of Architecture and Technology, 2005 (in Chinese).
[16] Liu Ji-ming, Shi Qing-xun, Li Zhi-jun, et al. Torsional behavior study of reinforced concrete boxing-section members subjected to biaxial eccentric compression, shear and reversed torque [J]. Building Structure, 2007, 37(7): 20-24 (in Chinese).
[17] Xu Yan-qiu, Xu Ke-bin, Liu Feng-kui. Calculating method and experimental study of torsion strength of concrete box beams under combining loading [J]. China Journal of Highway and Transport, 2000, 13(3): 36-40 (in Chinese).
[18] Zhao Jia-kang, Zhang Lian-de, Wei Yun-ting. Torsional strength of R.C. members subjected to compression, bending, shear and torsion [J]. China Civil Engineering Journal, 1993, 26(1): 20-30 (in Chinese).
[19] China Academy of Building Research. Experimental data sets of R.C. members [M]. Beijing: China Architecture & Building Press, 1985 (in Chinese).
