基于保险丝理论的BRB双柱墩易损性分析
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摘要
为避免桥墩构件在地震荷载作用下遭受严重破坏,基于保险丝理论,假想利用防屈曲耗能支撑(Buckling-restrained brace,BRB)作为保险丝构件装入双柱墩,合理设计其核心耗能段长度,保证在水平地震力作用下BRB构件先于桥墩构件屈服,从而保护桥墩构件。文章采用OpenSees数值分析平台,建立普通双柱墩和不同刚度比BRB双柱墩模型,从结构水平刚度的角度、以BRB构件先发生屈服为原则推导BRB核心段长度范围,通过拟静力分析和增量动力分析(IDA)方法对结构抗震性能进行分析并建立易损性曲线,得到不同模型的易损性曲线。结果表明:在地震荷载作用下,BRB构件先于桥墩构件屈服,耗散地震能量,桥墩构件发生各个等级破坏的概率均有所下降。合理设计BRB构件可降低桥墩构件发生各等级破坏的可能性,且BRB刚度越大耗能越大。
In order to avoid serious damage of pier members under seismic load, based on the fuse theory, it is assumed that the Buckling-restrained brace(Buckling-restrained brace,BRB) is used as fuse member to load double-column piers, and the length of its core energy dissipation section is designed reasonably to ensure that BRB members yield before pier members under horizontal seismic force, so as to protect pier members.In this paper, the OpenSees numerical analysis platform is used to establish the model of common double-column pier and BRB double-column pier with different stiffness ratio.From the point of view of horizontal stiffness, the length range of BRB core segment is deduced based on the principle that BRB member yields first. The seismic performance of the structure is analyzed by quasi-static analysis and incremental dynamic analysis(IDA) method, and the vulnerability curves of different models are established, and the vulnerability curves of different models are obtained. The results show that under the action of seismic load, the BRB member succumbs before the pier member, dissipates the seismic energy, and the probability of each grade failure of the pier member decreases. Reasonable design of BRB members can reduce the possibility of failure of pier members, and the greater the stiffness of BRB, the greater the energy consumption.
In order to avoid serious damage of pier members under seismic load, based on the fuse theory, it is assumed that the Buckling-restrained brace(Buckling-restrained brace,BRB) is used as fuse member to load double-column piers, and the length of its core energy dissipation section is designed reasonably to ensure that BRB members yield before pier members under horizontal seismic force, so as to protect pier members.In this paper, the OpenSees numerical analysis platform is used to establish the model of common double-column pier and BRB double-column pier with different stiffness ratio.From the point of view of horizontal stiffness, the length range of BRB core segment is deduced based on the principle that BRB member yields first. The seismic performance of the structure is analyzed by quasi-static analysis and incremental dynamic analysis(IDA) method, and the vulnerability curves of different models are established, and the vulnerability curves of different models are obtained. The results show that under the action of seismic load, the BRB member succumbs before the pier member, dissipates the seismic energy, and the probability of each grade failure of the pier member decreases. Reasonable design of BRB members can reduce the possibility of failure of pier members, and the greater the stiffness of BRB, the greater the energy consumption.
引文
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[14]SHOME N,CORNELL C A.Probabilistic Seismic Demand Analysis Of Nonline-ar Structures[R].Report No.RMS-35,RMS Program. Stanford:Stanford University,CA,1999.
[2]WADAA,IWATA M. Damage-cont-rolled Structure.:Preliminary De sign Meth-odology for Seismically Active Regions[J].Journal of Struct ural Engineering,1997,123(4):423-431.
[3]FORTONEY PJ,SHAHROOZ B M.Large-scale Testing of a Replaceable“Fuse”Steel Coupling Beam[J]. Journal of Str-uctural Engineering,2007,133(12):1801-1807.
[4]EL-BAHEY S,BRUNEAU M. Piers with Structual Fuses and Bi-steel Col umns:Experimental Testing[J]. Journal of br-idge Engineering,2012,17(1):25-31.
[5]SAMER EL-BA,Michel Breneau. Buckl-ing Restrained Braces As Struc tural F-uses For The Seismic Retrofit Of Rein-forced Concrete Bridge Bents[J]. Engi-neering Structures,2011:1052-1061.
[6]ANURAG UPADHYAY. Seismic Retrofit Of Curved Bridges On Soft Soils Using Buckling Restrained Braces[D].Salt Lake City:The University of Utah,2016.
[7]姜中葆,大地震作用下斜腿刚构桥的安全性能研究及防屈曲支撑加固的探讨[D].青岛:青岛理工大学,2013.
[8]Bryant G. Nielson. Analytical Fragility Curves for Highway Bridges in Mod er-ate Seismic Zones[D]. Atlanta:Georgia Institute of Technology,2005.
[9]王鹏,防屈曲耗能支撑在实际工程中的应用及分析[D].合肥:合肥工业大学,2013.
[10]张家广.防屈曲支撑加固钢筋混凝土框架抗震性能及设计方法[D].哈尔滨:哈尔滨工业大学,2015.
[11]于晓辉,吕大刚,王光远.土木工程结构地震易损性分析的研究进展[C]//第二届结构工程新进展国际会议论文集,辽宁:大连,2008.
[12]王东升,翟桐,郭明珠.利用Pushover分析方法评价桥梁的安全性[J].世界地震工程,2000,16(2):47-51.
[13]H.HWANG,刘晶波.地震作用下钢筋混凝土桥梁结构易损性分析[J].土木工程学报,2004:47-51.
[14]SHOME N,CORNELL C A.Probabilistic Seismic Demand Analysis Of Nonline-ar Structures[R].Report No.RMS-35,RMS Program. Stanford:Stanford University,CA,1999.