Effectiveness Analysis on the Protection Measures for the Mountain Bridge Piers against Rockfall

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In order to study effectiveness of measures taken to protect mountain bridge piers against rockfall in the upper reaches of the Minjiang River in Sichuan, based on non-linear explicit dynamic analysis, a numerical model was established to analyze the effectiveness using Holmquist–Johnson –Cook(HJC) damage constitutive model .And the numerical stability of calculation was tested in accordance with energy conservation principle. Four working conditions of bridge pier, namely ordinary non-protection, encryption stirrups, thickening plain concrete protection layer, being wrapped in steel tube, had been analyzed.Then by studying the response characteristics of the pier including the maximum damage depth of concrete, stress of longitudinal rebar, failure volume of concrete, different effectiveness of the three protective measures was compared . The rationality of analysis was verified by comparing with experimental results.The study shows that the HJC constitutive model can simulate the behavior of concrete under impact load well, and respectively protective effect of being wrapped in steel tube , thickening plain concrete protection layer, encryption stirrups, is weaker than the previous one.

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Periodical:

Edited by:

Chunliang Zhang and Paul P. Lin

Pages:

1683-1688

DOI:

10.4028/www.scientific.net/AMM.226-228.1683

Citation:

Z. X. Yu et al., "Effectiveness Analysis on the Protection Measures for the Mountain Bridge Piers against Rockfall", Applied Mechanics and Materials, Vols. 226-228, pp. 1683-1688, 2012

Online since:

November 2012

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$35.00

[1] Civil Engineering School of Southwest Jiaotong University : Investigation Report of The Bridge Pier-Rockfall Collision in Western Mountain(2011). (In Chinese).

[2] X.M. Li,J.M. Han D.S. Zhu and Y.Q. Lian: Numerical Simulation of Rolling Stone-bridge Pier Collision, Journal of Chongqing Jiaotong University(Natural Science), Vol. 30(2011)NO. 5, p.934-p.937. (In Chinese).

[3] F. Nicot,B. Cambou and G. Mazzoleni: Design of Rockfall Restraining Nets from a Discrete Element Modelling, Rock Mechanics and Rock Engineering, Vol. 34(2001)NO. 2, pp.99-118.

DOI: 10.1007/s006030170017

[4] L. He: Research on Simulation Analysis for Collision between Ship and Pier of Large Span Bridge(MS., SouthWest Jiaotong University, China 2009) pp.28-66. (In Chinese).

[5] Y.Q. Lian: Numerical Simulations and Avoidance Research of Rolling Stone-Bridge Pier Collision(MS., Chongqing Jiaotong University, China 2011) pp.26-80. (In Chinese).

[6] D. Peila and C. Ronco: Technical Note: Design of rockfall net fences and the new ETAG 027 European guideline , Natural Hazards and Earth System Sciences, Vol. 9(2009)NO. 4, pp.1291-1298.

DOI: 10.5194/nhess-9-1291-2009

[7] T.J. Holomquist, G.R. Johnson and W.H. Cook: A computational constitutive model for concrete subjective to large strains, high strain rates, and high pressures. The 14th International Symposium on Ballistics. Quebec City, Canada, 1993: 593-600.

[8] X.T. Wu,Y. Li and H.P. Li: Research on HJC dynamic constitutive model for concrect, Journal of Hefei University of Technology, Vol. 32(2010)NO. 8, pp.340-344. (In Chinese).

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