设置BRB构件的双柱式桥墩的横桥向减震分析
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摘要
以某3×30 m公路高架桥为工程背景,采用非线性时程反应分析法,研究了两种不同墩高下BRB的设置方式及核心段材料屈服强度σ(80~235 MPa)对桥梁地震反应的影响规律。结果表明:(1)设置BRB的双柱式墩在横桥向地震作用下减震效果显著,具体减震效果与BRB的屈服耗能及改变上部结构地震力在桥墩体系中的传力路径双重因素有关。(2)对9 m高双柱式墩,BRB的最优布置为单斜杆形式。当BRB的核心段屈服应力σ取值较大时,BRB将不进入屈服,通过其侧向刚度改变结构体系的传力路径。(3)对18 m高双柱式墩,BRB的最优布置为双平行斜杆布置。BRB的减震效果随着σ的增大而增加,在σ取值较大值时,BRB起改变传力路径及滞回耗能的双重作用。(4)在双柱式桥墩中合理设置BRB并取其最优力学参数,可有效改善桥梁下部结构的抗震性能。对本文算例,9 m和18 m高双柱式墩墩底弯矩减震率分别为34%和44%。
Taking a 3 × 30 m highway viaduct as engineering background,the method of setting BRB and yield strength of core segmentσ( 80 ~ 235 MPa) on the seismic response of bridge with two different pier height are studied by adopting method of nonlinear time history response analysis. Results shows:( 1) The effect of the double column pier with BRB on the seismic response of the bridge is significant,and the specific damping effect is related to the yield energy consumption of BRB and the change of the seismic force of the superstructure in the bridge system.( 2) For 9 m high double-column pie,the optimal arrangement of BRB is in the form of a single rod. When the core section of BRB yield stress valueσ is large,BRB will not enter the yield,through the force transmission path structure of its lateral stiffness change;( 3) For 18 m high double-column pie the optimal layout of BRB double parallel oblique rod arrangement. The damping effect of BRB increases with the increase of σ,When theσ is larger,BRB plays a dual role in changing the load path and hysteretic energy dissipation.( 4) The reasonable performance of the BRB and the optimum mechanical parameters can be effectively improved in the double column piers. For the example of this paper,9 m and 18 m high moment at the bottom double-column Pier damping rates were 34% and 44%.
Taking a 3 × 30 m highway viaduct as engineering background,the method of setting BRB and yield strength of core segmentσ( 80 ~ 235 MPa) on the seismic response of bridge with two different pier height are studied by adopting method of nonlinear time history response analysis. Results shows:( 1) The effect of the double column pier with BRB on the seismic response of the bridge is significant,and the specific damping effect is related to the yield energy consumption of BRB and the change of the seismic force of the superstructure in the bridge system.( 2) For 9 m high double-column pie,the optimal arrangement of BRB is in the form of a single rod. When the core section of BRB yield stress valueσ is large,BRB will not enter the yield,through the force transmission path structure of its lateral stiffness change;( 3) For 18 m high double-column pie the optimal layout of BRB double parallel oblique rod arrangement. The damping effect of BRB increases with the increase of σ,When theσ is larger,BRB plays a dual role in changing the load path and hysteretic energy dissipation.( 4) The reasonable performance of the BRB and the optimum mechanical parameters can be effectively improved in the double column piers. For the example of this paper,9 m and 18 m high moment at the bottom double-column Pier damping rates were 34% and 44%.
引文
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[16]李国强,孙飞飞,张杨.屈曲约束支撑的应用分类标准与性能标准[J].土木建筑与环境工程,2010,33(2):391-396.LI Guoqiang,SUN Feifei,ZHANG Yang.Applied classification criteria and performance criteria for buckling restrained braces[J].Civil Engineering and Environmental Engineering,2010,33(2):391-396.(in Chinese)
[2]庄卫林,刘振宇,蒋劲松.汶川大地震公路桥梁震害分析与对策[J].岩石力学与工程学报,2009,(7):1377-1387.ZHUANG Weilin,LIU Zhenyu,JIANG Jinsong.Seismic damage analysis and Countermeasures of highway bridges in Wenchuan earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,(7):1377-1387.(in Chinese)
[3]王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查[J].地震工程与工程振动,2009,29(3):84-94.WANG Dongsheng,GUO Xun,SUN Zhiguo,et al.Damage to highway bridges during Wenchuan earthquake[J].Earthquake Engineering and Engineering Dynamics,2009,29(3):84-94.(in Chinese)
[4]叶爱军,管仲国.桥梁抗震[M].北京:人民交通出版社,2011.YE Aijun,GUAN Zhongguo.Seismic resistance of bridges[M].Beijing:China Communications Press,2011.(in Chinese)
[5]周云.防屈曲耗能支撑结构设计与应用[M].北京:中国建筑工业出版社,2007.ZHOU Yun.Design and application of buckling restrained brace structure[M].Beijing:China Architecture and Building Press,2007.(in Chinese)
[6]吕西林,陈聪.带有可更换构件的结构体系研究进展[J].地震工程与工程振动,2014,34(1):27-36.LV Xilin,CHEN Cong.Research progress in structural systems with replaceable members[J].Earthquake Engineering and Engineering Dynamics,2014,34(1):27-36.(in Chinese)
[7]吴徽,张艳霞,张国伟,等.防屈曲支撑作为可替换耗能元件抗震性能试验研究[J].土木工程学报,2013,46(11):29-36.WU Hui,ZHANG Yanxia,ZHANG Guowei,et al.Experimental study on seismic performance of buckling restrained brace as replaceable energy dissipation element[J].Chinese Journal of civil engineering,2013,46(11):29-36.(in Chinese)
[8]Yuandong Wang,ASCE S M,Luis,et al.Seismic retrofit of a three-span RC bridge with buckling-restrained braces[J].Journal of Bridge,2016,21(7):04016073.
[9]EI-Bahey S,Brunaeu M.Bridge piers with structural fuses and bi-steel colums.I:experimental testing[J].Journal of Bridge Engineering,ASCE,2011,17(01):25-35.
[10]El-Bahey S,Bruneau M.Bridge piers with structural fuses and bi-steel columns.II:analytical investigation[J].Journal of Bridge Engineering,ASCE,2012,17(1):36-46.
[11]Xiaone Wei,Michel Bruneau,ASCE F.Case study on applications of structural fuses in bridge bents[J].Journal of Bridge Engineering,2016,21(7):05016004.
[12]石岩.减隔震桥梁性能设计方法及环境影响因素研究[D].大连:大连海事大学,2015.SHI yan.Performance design method of isolated bridge and environmental impact factors of[D].Dalian:Dalian Maritime University,2015.(in Chinese)
[13]孙治国,华承俊,石岩,等.利用BRB实现桥梁排架基于保险丝理念的抗震设计[J].振动与冲击,2015,34(22):199-205SUN Zhiguo,HUA Chengjun,SHI Yan,et al.Seismic design of bridge bents with BRB as a structural fuse[J].Journal of Vibration and Shock,2015,34(22):199-205.(in Chinese)
[14]华承俊.桥梁排架结构地震破坏机理及损伤控制方法[D].大连:大连海事大学,2015.HUA Chengjun.Seismic damage mechanism and damage control method of bridge bent structure[D].Dalian:Dalian Maritime University,2015.(in Chinese)
[15]JTG/T B02—01—2008公路桥梁抗震设计细则[S].JTG/T B02—01—2008 Guidelines for Seismic Design of Highway Bridges[S].(in Chinese)
[16]李国强,孙飞飞,张杨.屈曲约束支撑的应用分类标准与性能标准[J].土木建筑与环境工程,2010,33(2):391-396.LI Guoqiang,SUN Feifei,ZHANG Yang.Applied classification criteria and performance criteria for buckling restrained braces[J].Civil Engineering and Environmental Engineering,2010,33(2):391-396.(in Chinese)