Effect of Eccentric Pounding on Elasto-Plastic Behavior of a Simply Supported Bridge under Transverse Earthquake

Abstract:

Article Preview

An increasing number of bridges have been built in earthquake zones, alonged with rapid development of high-speed railway. Their seismic behaviors attract researchers’ attention now. The steel shear keys as falling-off prevention measures have been used widely in 32m simply-supported box girder bridges on high-speed railways in China. To allow for transverse temperature movement, the shear keys are placed with a slight gap from the girders. However, out-of-phase vibrations between superstructures and substructures result in nonlinear eccentric pounding between bearing base and steel shear keys if the relative displacements exceed their initial gaps. The aim of this paper is to analyze the effect of eccentric pounding on elasto-plastic behavior of a simply-supported concrete box girder bridge under transverse earthquake, and evaluate the seismic performance of falling-off prevention measures. The effect of cushion block on seismic response has been studied. The results of the study indicate that a bridge column occur plastic deformation and suffer residual displacements due to eccentric pounding, and simple analysis in elastic range may result in nonconservative results. The lateral shear keys play a key role in limiting girder displacements. By setting hardwood blocks between steel shear keys and bearing base, the pounding forces can be appropriately reduced, and the lateral seismic performance of bridge can be effectively improved

Info:

Periodical:

Edited by:

Chunliang Zhang and Paul P. Lin

Pages:

1669-1673

Citation:

Y. Shi et al., "Effect of Eccentric Pounding on Elasto-Plastic Behavior of a Simply Supported Bridge under Transverse Earthquake", Applied Mechanics and Materials, Vols. 226-228, pp. 1669-1673, 2012

Online since:

November 2012

Export:

Price:

$38.00

[1] S. Muthukumar and R. Desroches. A Hertz contact model with non-linear damping for pounding simulation. Earthquake engineering and structural dynamics, Vol. 35 (2006) No. 7, p.811.

DOI: https://doi.org/10.1002/eqe.557

[2] W.F. Chen and L. Duan. Bridge Engineering Seismic Design. (CRC Press, USA 2003. ).

[3] M.H. Jonsson, B. Bessason and E. Haflidason. Earthquake response of a base -isolated bridge subjected to strong near-fault ground motion. Soil dynamics and earthquake engineering, Vol. 30 (2010), p.447.

DOI: https://doi.org/10.1016/j.soildyn.2010.01.001

[4] W.L. Zhuang, Z.Y. Liu and J.S. Jiang. Earthquake- induced damage analysis of highway bridges in Wenchuan Earthquake and Countermeasures [J]. Journal of rock mechanics and engineering, Vol. 28(2009) p.1377. (in Chinese).

[5] Y.L. Deng, T.B. Peng and J.Z. Li. Pounding model of bridge structures and parameter analysis under transverse earthquakes. Journal of vibration and shock, Vol. 26 (2007) No. 9, p.104 (in Chinese).