Vol.13 (2010 8 )

A static non-linear analysis method for redundancy evaluation of steel truss bridges

* ** *** ****

Takao Miyoshi, Nobuo Nishimura, Yuichi Tateishi and Satoshi Nara

* ( ) 565-0871 2-1 ** 565-0871 2-1

565-0871 2-1 **** 565-0871 2-1

This paper proposes a static non-linear analysis method for redundancy evaluation of steel truss bridges. Since many main members of the steel truss bridge consist of spatial frames with closed cross-sections, accurate evaluation of the torsional rigidity should be required in the elasto-plastic state. Especially, the implicit stress integration method and the evaluation method of the elasto-plastic stiffness are proposed in this study, in order to improve accuracy and efficiency. Validity and reliability of the proposed method are clarified through some numerical examples. As a result, it is shown that the proposed method has higher accuracy and more excellent efficiency than conventional ones. Finally, a numerical example for redundancy of a truss bridge is demonstrated. Key Words : steel truss bridge, thin-walled closed cross-section, implicit stress

integration, redundancy

1

2007 I-35W

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応用力学論文集 Vol.13, pp.965-976　 （2010 年 8 月） 土木学会

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(1)

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1)

pp.1-4 2009. 2)

A Vol.65No.2 pp.410-425 2009.

3)

64I-113 pp.225-226 2009.

4) Komastu S. and Sakimoto T. Elasto-plastic behavior of thin-walled steel tubes under combined forces Proc. of JSCE No.235 pp.125-136 1975.

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6) Li, X. S. and Goto Y. A three-dimensional nonlinear seismic analysis of frames considering panel zone deformations Journal of Structural Mechanics and Earthquake Engineering No.605

-45 JSCE pp.1-13 1998. 7)

305 pp.47-58 1981. 8)

1998. 9) Simo, J. C. and Taylor, R. L. A Return Mapping

Algorithm for Plane Stress ElastoplasticityInternational Journal for Numerical Methods in Engineering Vol.22 pp.649-670 1986.

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13) M, Kojic and K, J, Bathe Inelastic Analysis of Solids and Structures Springer 2005.

14)

No.689 I-57pp.85-100 2000.

15) III 2002

2010 3 9

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