高铁大跨桥梁设计地震作用与国内外主要抗震规范的比较研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (4) : 72-80.

论文

倪永军，陆星吉，江辉，杨庆山，赵伯明，朱晞

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Comparative Research on Design Earthquake Actions of Long-span Girder Bridge in High-Speed Rail with Those Specified in the Major Codes in China and Foreign Countries

Yongjun Ni, Xingji Lu, Hui Jiang, Qingshan Yang, Boming Zhao and Xi Zhu

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文章历史 +

摘要

本文选择了现行国内外主要抗震设计规范，对比了国内外主要抗震设计规范的场地类型划分的差异；考虑地震的重现期与结构的重要性系数等因素，对比分析了我国不同行业抗震规范与《铁路工程抗震设计规范》2009年修正版在多遇地震(小震)、设防烈度地震(中震)和罕遇地震(大震)下各规范反应谱平台取值以及反应谱曲线本身。研究表明我国高铁大跨桥梁在小震的设计取值偏高，中震取值与国内其它规范相当，而大震的取值则偏低。我国高铁大跨桥梁的设计地震作用与欧洲规范Eurocode 8 的对比研究表明，我国的小震(50年重现期)取值小于欧洲规范(90年重现期)、中震(475年重现期)取值也小于欧洲规范(475年重现期)的相应取值。与美国AASHTO规范和加州规范Caltrans(2013)对比研究表明，由于我国规范采用了1.5的重要性系数，小震取值(50年重现期)远高于美国规范的50年重现期的设计地震水平，而与其475年重现期地震水平相当；中震水平(475年重现期)的加速度反应谱平台值略低于Caltrans(975年重现期)，但是略高于AASHTO(1000年重现期)，我国反应谱曲线与Caltrans大致相当，但是高于AASHTO；对于大震(2475年重现期)，AASHTO(2475年重现期)的地震作用取值介于我国的7度 (0.1g) 设防与8度(0.2g)设防之间。总体来说，我国的高铁大跨桥梁的设计地震作用取值偏于保守。

Abstract

Based on the selected codes for seismic design in China and foreign countries, the difference on the classification of the site soil was compared. Considering the factors such as the return period of the earthquake and the importance coefficients of the structures, the acceleration platform and the curves of the response spectrum on different earthquake levels, namely the frequently occurred earthquake(FOE), designed fortification earthquake(DE) and the rarely occurred earthquake(ROE) for the main seismic design codes in China compared with the Code for Seismic Design of Railway Engineering (GB50111-2006, 2009 Version). It was shown that the design earthquake action at the level of FOE for the long-span bridges in high-speed rail were conservatively higher than those of other seismic design codes. The seismic actions at the level of the DE were similar to those of the seismic design codes in China, while for the ROE, the seismic actions were relatively lower. Comparison analysis on the seismic actions for long-span bridges in high-speed rail between the code (GB50111-2006, 2009 Version) and the Eurocode 8 showed that the FOE actions in China(50 years return period) were lower than those from the Eurocode 8(90 years return period), and so far as the DE action(both 475 years of return period). Results from the comparison analysis on the seismic actions coded in AASHTO and Caltrans with the code (GB50111-2006, 2009 Version) showed that the FOE actions(50 years of return period) in China were much higher than those from AASHTO and Caltrans, due to the adoption of 1.5 as the importance coefficient of structures; the maximum acceleration values of the response spectra for the DE level in China(475 years of return period) were slightly lower than those Caltrans(975 years return period), but slightly higher than those in AASHTO(1000 years return period); The curves of the response spectrum in China were similar to the curves in Caltrans, but a little higher than those in AASHTO; For the ROE(2475 years return period), the values of seismic actions in AASHTO were between the values of those from the design acceleration 0.1g and 0.2g. In summary, the design earthquake actions for the long-span bridges in high-speed rail in China were relatively conservative.

导出引用

倪永军，陆星吉，江辉，杨庆山，赵伯明，朱晞. 高铁大跨桥梁设计地震作用与国内外主要抗震规范的比较研究[J]. 振动与冲击, 2016, 35(4): 72-80

Yongjun Ni, Xingji Lu, Hui Jiang, Qingshan Yang, Boming Zhao and Xi Zhu. Comparative Research on Design Earthquake Actions of Long-span Girder Bridge in High-Speed Rail with Those Specified in the Major Codes in China and Foreign Countries[J]. Journal of Vibration and Shock, 2016, 35(4): 72-80

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