山区桥梁双柱式桥墩设置BRB的减震效果研究
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摘要
为增强山区桥梁双柱式桥墩的横向抗震能力,尝试采用一种新型的耗能减震构件,即在双柱式桥墩之间设置防屈曲支撑(Buckling-Restrained Braces,BRB),并通过数值分析手段研究其减震效果。考虑双柱式桥墩的规则性和BRB布置形式,利用SAP2000软件建立含BRB的双柱式桥墩横向分析模型。采用谱分析和非线性时程分析,得到双柱墩小震(线弹性)和大震(弹塑性)作用下的内力和变形。引入减震率和残余位移角两个参数,通过增量动力分析方法,进一步验证BRB对双柱式桥墩抗震能力的提升作用。结果表明,小震下BRB可减轻规则与非规则双柱式桥墩承受的地震力,但会一定程度增加基础剪力,大震下BRB能够有效减小桥梁墩柱最大塑性变形并控制其残余位移角。
In order to improve the lateral seismic performance of bridges with double column bents in mountain areas,a new seismic retrofitting method for the bents was proposed by using buckling-restrained braces( BRB) as a seismic dissipation damper and the seismic behaviors of the bents were analyzed. Considering the regularity of the bents and layout of the BRB,a seismic analysis model for the bents in lateral direction retrofitted with BRB was built by using the software SAP2000. The internal forces and deformations of the bents were obtained by the linear response spectrum analysis under small earthquakes and the nonlinear time history analysis under strong earthquakes. The incremental dynamic analysis on the double column bridge bents retrofitted with BRB was conducted,and the responses of the bents were further verified by introducing two comparable parameters,the seismic response reduction ratio and residual drift ratio. The results show that the BRB can reduce internal forces of the bents effectively,while the shear strength demand of the bent base would be increased. The BRB could also reduce the maximum plastic deformation and residual drift ratio of the bents effectively.
In order to improve the lateral seismic performance of bridges with double column bents in mountain areas,a new seismic retrofitting method for the bents was proposed by using buckling-restrained braces( BRB) as a seismic dissipation damper and the seismic behaviors of the bents were analyzed. Considering the regularity of the bents and layout of the BRB,a seismic analysis model for the bents in lateral direction retrofitted with BRB was built by using the software SAP2000. The internal forces and deformations of the bents were obtained by the linear response spectrum analysis under small earthquakes and the nonlinear time history analysis under strong earthquakes. The incremental dynamic analysis on the double column bridge bents retrofitted with BRB was conducted,and the responses of the bents were further verified by introducing two comparable parameters,the seismic response reduction ratio and residual drift ratio. The results show that the BRB can reduce internal forces of the bents effectively,while the shear strength demand of the bent base would be increased. The BRB could also reduce the maximum plastic deformation and residual drift ratio of the bents effectively.
引文
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[15] KAWASHIMA K,MACRAE G A,HOSHIKUMA J I,et al.Residual displacement response spectrum[J]. Journal of Structure Engineering,ASCE,1998,124(5):523-530.
[2]李晓莉,孙治国,王东升,等.高地震烈度区含矮墩桥梁抗震设计[J].公路交通科技,2012,29(4):67-71.LI Xiaoli,SUN Zhiguo,WANG Dongsheng,et al. Seismic design for bridges with short piers in high earthquake intensity zones[J]. Journal of Highway and Transportation Research and Development,2012,29(4):67-71.
[3]赵俊贤,吴斌,梅洋,等.防屈曲支撑的研究现状及关键理论问题[J].防灾减震工程学报,2010,30(增刊1):93-100.ZHAO Junxian,WU Bin,MEI Yang,et al. Present situation of the research on buckling restrained brace and key theoretical issues[J]. Journal of Disaster Prevention and Mitigation Engineering,2010,30(Supl):93-100.
[4] USAMI T,LU Zhizhao,GE Hanbin. A seismic upgrading method for steel arch bridges using buckling-restrained braces[J]. Earthquake Engineering and Structural Dynamics,2005,34(4):471-496.
[5] CHEN Zhiyi,GE Hanbin,Kasai A,et al. Simplified seismic design approach for steel portal frame piers with hysteretic dampers[J]. Earthquake Engineering and Structural Dynamics,2007,36(4):541-562.
[6] EL-BAHEY S,BRUNEAU M. Buckling restrained braces as structural fuses for the seismic retrofit of reinforced concrete bridge bents[J]. Engineering Structures,2011,33(3):1052-1061.
[7] EL-BAHEY S,BRUNEAU M. Bridge piers with structural fuses and bi-steel columns. I:Experimental testing[J].Journal of Bridge Engineering, ASCE, 2012, 17(1):25-35.
[8] 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.
[9]孙利民,魏俊,刘建新,等.耗能型辅助墩抗震性能数值研究[J].工程力学,2014,31(12):57-67.SUN Limin, WEI Jun, LIU Jianxin, et al. Numerical investigation of seismic performance of energy dissipation subsidiary piers[J]. Engineering Mechanics, 2014,31(12):57-67.
[10]谢文,孙利民,魏俊.附有结构“保险丝”构件的桥墩抗震性能试验研究及其应用[J].中国公路学报,2014,27(3):59-70.XIE Wen,SUN Limin,WEI Jun. Experimental study on seismic performance of bridge piers with structural fuses and its application[J]. China Journal of Highway and Transport,2014,27(3):59-70.
[11]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(2):199-205.SUN 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(2):199-205.
[12] BAZAEZ R,DUSICKA P. Cyclic behavior of reinforced concrete bridge bent retrofitted with buckling restrained barces[J]. Engineeing Structures,2016,119(15):34-48.
[13] WANG Y,IBARRA L,PANTELIDES C. Seismic retrofit of a three-span RC bridge with buckling-restrained braces[J].Journal of Bridge Engineering, ASCE, 2016, 21(11):04016073.
[14]公路桥梁抗震设计细则:JTG/T B02-01—2008[S].北京:人民交通出版社,2016.
[15] KAWASHIMA K,MACRAE G A,HOSHIKUMA J I,et al.Residual displacement response spectrum[J]. Journal of Structure Engineering,ASCE,1998,124(5):523-530.