基于性能的大跨径斜拉桥主塔概率地震风险分析
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摘要
地震作用下,若斜拉桥主塔发生损伤,将使整体损伤风险明显提高。因此对斜拉桥主塔进行地震易损性分析来评定主塔的抗震能力,进而评估斜拉桥主塔在设计基准期内的地震损伤风险,具有重要的工程和经济意义。本文通过SAP2000有限元分析软件对某斜拉桥主塔进行了纵横向的地震易损性及危险性分析,结合地震易损性和危险性分析推导出概率地震风险函数,进而开展了斜拉桥的概率地震风险分析。分析结果证明,在100年设计基准期内,纵桥向或横桥向地震作用下,本文斜拉桥"H"型主塔均满足E3水准抗震设防要求。
If the main tower that mainly bear load is damaged under the action of earthquake,the overall damage risk of cable-stayed bridge will be significantly increased. Therefore,we needed to assess the seismic resistance of the main tower through the seismic vulnerability analysis,and then assess the seismic risk of the main tower in the design reference period,which had important engineering and economic significance This paper analyzed the seismic vulnerability analysis and seismic hazard analysis of the main tower through SAP2000 finite element analysis software. Based on the analysis of seismic vulnerability analysis and seismic hazard analysis,the probability seismic risk function was deduced,and the probability seismic risk analysis of the main tower was carried out. It showed that during the 100-year design base period,the " H " type main pylon of the cable-stayed bridge meets the requirements of E3 standard seismic fortification under the effect of longitudinal or transverse earthquake.
If the main tower that mainly bear load is damaged under the action of earthquake,the overall damage risk of cable-stayed bridge will be significantly increased. Therefore,we needed to assess the seismic resistance of the main tower through the seismic vulnerability analysis,and then assess the seismic risk of the main tower in the design reference period,which had important engineering and economic significance This paper analyzed the seismic vulnerability analysis and seismic hazard analysis of the main tower through SAP2000 finite element analysis software. Based on the analysis of seismic vulnerability analysis and seismic hazard analysis,the probability seismic risk function was deduced,and the probability seismic risk analysis of the main tower was carried out. It showed that during the 100-year design base period,the " H " type main pylon of the cable-stayed bridge meets the requirements of E3 standard seismic fortification under the effect of longitudinal or transverse earthquake.
引文
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[5]黄佳梅.基于IDA的高墩大跨桥梁抗震性能研究[D].长沙:湖南大学,2012.HUANG Jiamei. Research on the seismic performance of bridge with high piers and long spans using incremental dynamic analysis[D]. Changsha:Hunan University,2012.(in Chinese)
[6] CORNELL C A. Engineering seismic risk analysis[J]. Bulletin of the Seismological Society of America,1968,58(5):1583-1606.
[7] CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.CJJ 166-2011 Code for Seismic Design of Urban Bridges[S]. Beijing:China Architecture and Building Press,2011.(in Chinese)
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[10]丰丙龙.基于性能的大跨径斜拉桥地震易损性及风险分析[D].西安:长安大学,2017.FENG Binglong. Performance-based seismic fragility and risk analysis of long-span cable-stayed bridge[D]. Xi'an:Chang’an University,2017.(in Chinese)
[2] Miyamoto,Kaneyoshi. Seismic damage evaluation system for bridge structure[J]. Safety,Risk,Reliability-Trends in Engineering. Malta:IABSE,2001:131-136.
[3]黄明刚.钢筋混凝土连续梁桥的地震易损性,危险性及风险分析[D].哈尔滨工业大学,2009.HUANG Minggang. Seismic fragility,hazard and risk analysis of reinforced concrete continuous girder[D]. Harbin Institute of Technology,2009.(in Chinese)
[4]沈怀至.基于性能的混凝土坝一地基系统地震破损分析与风险评价[D].北京:清华大学,2007.SHEN Huaizhi. Performance-based seismic damage analysis and risk evaluation model for concrete dam-foundation system[D]. Beijing:Tsinghua University,2007.(in Chinese)
[5]黄佳梅.基于IDA的高墩大跨桥梁抗震性能研究[D].长沙:湖南大学,2012.HUANG Jiamei. Research on the seismic performance of bridge with high piers and long spans using incremental dynamic analysis[D]. Changsha:Hunan University,2012.(in Chinese)
[6] CORNELL C A. Engineering seismic risk analysis[J]. Bulletin of the Seismological Society of America,1968,58(5):1583-1606.
[7] CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.CJJ 166-2011 Code for Seismic Design of Urban Bridges[S]. Beijing:China Architecture and Building Press,2011.(in Chinese)
[8] CORNELL C A. Risk-based structural design[C]. Proceedings of Symposium on Risk Analysis. Ann Arbor,MI:University of Michigan,1994:11-12.
[9] JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/TB02-01-2008 Guidelines for Seismic Design of Highway Bridges[S]. Beijing:China Communications Press,2008.(in Chinese)
[10]丰丙龙.基于性能的大跨径斜拉桥地震易损性及风险分析[D].西安:长安大学,2017.FENG Binglong. Performance-based seismic fragility and risk analysis of long-span cable-stayed bridge[D]. Xi'an:Chang’an University,2017.(in Chinese)