Numerical Simulations of Canyon Topography Effects on Long-Span Bridge with High Piers under Incident SH Seismic Waves

Abstract:

To evaluate the influences of the canyon topography on large structures, based on a rigid frame bridge across a 137-meter-deep and 600-meter-wide canyon, the seismic response of the canyon topography is analyzed under seismic SH waves with the assumptions of vertical incidence and oblique incidence to obtain the surface ground motions, which are used as the excitations for the bridge. It indicates that canyon topography has significant and complex influences on the surface ground motions. The peak ground accelerations vary greatly from the bottom of the canyon to the upper corners. And the ground surface has been characterized by larger relative displacements in the case of oblique incidence. Compared with the uniform seismic excitations, it’s hard to find out any regularity on structural seismic responses considering the canyon topography effects. The canyon topography can enlarge or minish the structural responses in terms of the different structure members, and it should be a carefully considered factor in structural seismic analysis and design.

• Periodical: Advanced Materials Research (Volumes 378-379)
• Pages: 789-794
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.378-379.789
• Online since: October 2011
• Authors: Guo Liang Zhou, Xiao Jun Li, Qing Li Meng
• Keywords: Canyon Topography Effect, Improved Large-Mass Method, Multi-Support Excitation, Rigid Frame Bridge, Seismic Response

References

[1] Kiureghan. Response spectrum method for multi-support seismic excitations. Earthquake Engineering and Structural Dynamics, 1992, 21(8): 713~-740.

DOI: 10.1002/eqe.4290210805

[2] Ma, S., R. J. Archuleta, and M. T. Page. Effects of large-scale surface topography on ground motion, as demonstrated by a study of the San Gabriel Mountains, Los Angeles, California, Bull. Seismol. Soc. Am , 2007(97): 2066~(2079).

DOI: 10.1785/0120070040

[3] Hartzell, S. H., D. L. Carver, and K. W. King. Initial investigation of site and topographic effects at Robinwood Ridge, California, Bull. Seismol. Soc. Am, 1994, (84): 1336~1349.

DOI: 10.1785/bssa0840051336

[4] Huang, B. S. Two-dimensional reconstruction of the surface ground motion of an earthquake: the September 21, 1999, Chi-Chi, Taiwan earthquake, Geophys. Res. Lett, 2000, (27): 3025~3028.

DOI: 10.1029/2000gl011481

[5] Guoliang Zhou, Xiaojun Li. Failure Modes of Near-fault Bridges in Wenchuan Earthquake[J]. Technology for Earthquake Disaster Prevention, 2008, 3(4): 31~37(in Chinese).

[6] George D. B, George Kouretzis. Review of soil and topography effects in the September 7 , 1999 Athens, Greece Earthquake (C). Proceedings of 4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, San Diego, California, 2001: SPL10. 3.

DOI: 10.1016/s0267-7261(01)00045-8

[7] ZHOU GL, LI XJ , Q XJ. Seismic response analysis of continuous rigid frame bridge considering canyon topography effects under incident SV waves [J]. Earthquake Science, 2010, 23(1): 53~61.

DOI: 10.1007/s11589-009-0065-7

[8] Liao Z P. Introduction to Wave Motion Theories for Engineering. Science Press, Beijing, 1996, 156 ~163(in Chinese).

[9] Leger P, Ide I M and Paultre P. Multiple support seismic analysis of large structures. Computers & Structures, 1990(36): 1153~-1158.

DOI: 10.1016/0045-7949(90)90224-p

[10] ZHOU GL, LI XJ . Improved Large Mass Method Used in Structural Base Excitation Analysis [C]. Applied Mechanics and Materials, 2010, 29-32(2010): 1588-1593.

DOI: 10.4028/www.scientific.net/amm.29-32.1588

[11] ZHOU GL, LI XJ, YU Y et al. Applicability research on base excitation models used in structural seismic response analysis [J]. Journal of Building Structures (Supplementary Issue), 2010(3): 51~56.