摘要An ultra high-rise pier railway bridge in Guizhou province, China, is selected as an engineering example to study the effect of spatially varying site conditions on the seismic performance of mountainous ultra high-rise pier railway bridges. A seismic performance analysis and a numerical simulation of the bridge are conducted while subjecting the bridge to spatial varying site conditions using the pseudo excitation method. The influence of the distribution of different spatially varying combinations of firm, medium, and soft site conditions on the stochastic seismic response of this type of bridge are then considered for seismic analysis under multi-directional earthquake excitations. Results show that (1) combinations of different site conditions have varying influences on the seismic response of the ultra high-rise pier railway bridge, and in particular, the influence of local site conditions has the greatest structural response on the highest pier; (2) it is of considerable importance to avoid the most unfavorable condition of soft soil beneath the highest pier, and to avoid hard soil conditions beneath other piers; and (3) to ensure that structural responses are not underestimated, it is necessary to consider the spatially varying site conditions when conducting a seismic analysis of ultra high-rise pier railway bridge structures that are likely to be subjected to earthquake action.
Abstract：An ultra high-rise pier railway bridge in Guizhou province, China, is selected as an engineering example to study the effect of spatially varying site conditions on the seismic performance of mountainous ultra high-rise pier railway bridges. A seismic performance analysis and a numerical simulation of the bridge are conducted while subjecting the bridge to spatial varying site conditions using the pseudo excitation method. The influence of the distribution of different spatially varying combinations of firm, medium, and soft site conditions on the stochastic seismic response of this type of bridge are then considered for seismic analysis under multi-directional earthquake excitations. Results show that (1) combinations of different site conditions have varying influences on the seismic response of the ultra high-rise pier railway bridge, and in particular, the influence of local site conditions has the greatest structural response on the highest pier; (2) it is of considerable importance to avoid the most unfavorable condition of soft soil beneath the highest pier, and to avoid hard soil conditions beneath other piers; and (3) to ensure that structural responses are not underestimated, it is necessary to consider the spatially varying site conditions when conducting a seismic analysis of ultra high-rise pier railway bridge structures that are likely to be subjected to earthquake action.
基金资助:Supported by the National Natural Science Foundation of China (No:51308465);the Fundamental Research Funds for the Central Universities (No.682014CX004EM)
陈航, 郑史雄. 空间变化场地对超高墩铁路桥梁地震响应的影响[J]. Journal of Highway and Transportation Research and Development, 2015, 9(2): 61-68.
CHEN Hang, ZHENG Shi-xiong. Seismic Response of Ultra High-pier Railway Bridge under Spatially Varying Site Conditions of Earthquake Excitations. Journal of Highway and Transportation Research and Development, 2015, 9(2): 61-68.
[1] JIA Hong-yu, ZHENG Shi-Xiong. Analysis of Random Seismic Response of High-rise Pier Bridge in Mountain Area Based on Site Effect[J]. Journal of Highway and Transportation Research and Development, 2012, 29(6):93-97. (in Chinese)
[2] BI K, HAO H. Modeling and Simulation of Spatially Varying Earthquake Ground Motions at Sites with Varying Conditions[J]. Probabilistic Engineering Mechanics, 2012, 29(1):92-104.
[3] ZHANG Y H, LI Q S, LIN J H, et al. Random Vibration Analysis of Long-span Structures Subjected to Spatially Varying Ground Motions[J]. Soil Dynamics and Earthquake Engineering, 2009, 29(4):620-629.
[4] LIN Jia-hao, ZHANG Ya-hui, ZHAO Yan. Seismic Spatial Effects on Dynamic Response of Long-span Bridges in Stationary Inhomogeneous Random Fields[J]. Earthquake Engineering and Engineering Vibration, 2004, 3(2):171-180.
[5] JIANG Yang, SHI Yong-jiu, WANG Yuan-qing. Implementation of the Practical Pseudo Excitation Method for Multi-support Seismic Response Analysis in General FEM Software[J]. Earthquake Engineering and Engineering Vibration, 2010, 30(1):46-52. (in Chinese)
[6] LI Yong-hua, LI Si-ming. Pseudo Excitation Method Based on SoLving Absolute Displacement[J]. Journal of Vibration and Shock, 2009, 28(10):185-190. (in Chinese)
[7] JIA Hong-yu, ZHENG Shi-xiong, CHEN Guan-hua. Pseudo Excitation Method Applied to Multi-dimensional and Multi-support Excitations in ANSYS[J]. Earthquake Engineering and Engineering Vibration, 2012, 32(4):7-12. (in Chinese)
[8] JIA Hong-yu, ZHENG Shi-Xiong. Pseudo Excitation Method of Direct SoLving Ground Motion Equation of Multi-dimensional and Multi-support Excitation[J]. Engineering Mechanics, 2013, 30(3):341-346. (in Chinese)
[9] LIN Jia-hao, ZHANG Ya-hui. Pseudo Excitation Method for Random Vibration[M]. Beijing:Science Press, 2006. (in Chinese)
[10] CAO Zi, XUE Su-duo. Seismic Analysis and Design of Spatial Structures[M]. Beijing:Science Press, 2006. (in Chinese)
[11] DER KIUREGHIAN A, NEUENHOFER A. Response Spectrum Method for Multi-support Seismic Excitations[J]. Earthquake Engineering and Structural Dynamics, 1992, 21(8):713-740. (in Chinese)
[12] QU Tie-jun, WANG Jun-jie, WANG Qian-xin. Practical Ground Motion PSD Model with Spatial Effect[J]. Acta Seismologica Sinica, 1996, 18(1):55-62. (in Chinese)
[1]
常柱刚, 王林凯, 夏飞龙. 基于CV NewMark-b法桥梁风致振动FSI数值模拟[J]. Journal of Highway and Transportation Research and Development, 2019, 13(2): 28-37.
2015, Vol. 9 
