SMA铅芯橡胶支座在墩底隔震桥梁设计中的应用
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摘要
为提高某高架连续梁桥墩底隔震能力,在墩底处安装加入形状记忆合金(SMA)拉索的方形铅芯橡胶支座。根据形状记忆合金材料的相变超弹性,以变形等价为原则,将该材料的滞回曲线分解为刚弹性恢复回位曲线和滞回耗能曲线,通过线性叠加方法在SAP2000软件中模拟该支座的本构关系,进行地震响应分析。结果表明:纵桥向上,该新型桥梁隔震体系支座最大位移基本不变、中间墩承台底的最大弯矩平均降低57.18%,中间墩墩顶最大弯矩平均降低75%,可见整体隔震效果优于安装普通支座的墩底隔震体系。
In order to improve the pier base isolation capacity of an elevated continuous girder bridge,square lead rubber bearing with SMA tendons is installed on the bottom of piers. Based on the super-elasticity of SMA in its phase transition and the principle of deformation equivalent,the hysteretic curve of this material is resolved into two segments,namely the elastic restoring and self-centering curve and hysteretic energy-consumption curve. The seismic response analysis is based on the constitutive relation of this bearing which is simulated in SAP2000 by linear superposition. The results show that,the maximum displacement of bearings of this new type of bridge isolation system has not changed basically,the maximum bending moments of the middle pier bearing bottom are reduced by 57. 18% on average,and the maximum bending moments of the middle pier top are reduced by about 70 % on average,and it is found that the whole isolation effect is better than that of the base isolation system installed with general bearing.
In order to improve the pier base isolation capacity of an elevated continuous girder bridge,square lead rubber bearing with SMA tendons is installed on the bottom of piers. Based on the super-elasticity of SMA in its phase transition and the principle of deformation equivalent,the hysteretic curve of this material is resolved into two segments,namely the elastic restoring and self-centering curve and hysteretic energy-consumption curve. The seismic response analysis is based on the constitutive relation of this bearing which is simulated in SAP2000 by linear superposition. The results show that,the maximum displacement of bearings of this new type of bridge isolation system has not changed basically,the maximum bending moments of the middle pier bearing bottom are reduced by 57. 18% on average,and the maximum bending moments of the middle pier top are reduced by about 70 % on average,and it is found that the whole isolation effect is better than that of the base isolation system installed with general bearing.
引文
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[9]苗晓瑜,王社良.SMA-橡胶复合支座的力学性能及在桥梁结构中的应用研究[J].西安建筑科技大学学报(自然科学版),2012,44(1):28—32.
[10]JTG/T B02—01—2008.公路桥梁抗震设计细则[S].
[11]JTG D62—2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[2]周海俊,徐希,刘海峰.简支梁桥形状记忆合金装置减震防落研究[J].振动与冲击,2015,34(21):194—199.
[3]庄鹏,薛素铎,韩淼,等.SMA弹簧-摩擦支座的滞回性能研究[J].振动与冲击,2015,35(9):94—100.
[4]Khodaverdian A,Ghorbani-Ttanha A,Rahimian M.An innovative base islation system with Ni-Ti alloy and its application in seismic vibration control of Izadkhast bridge[J].Journal of Intelligent Material Systems and Structures,2012,23(8):897—908.
[5]逄鹏程.形状记忆合金阻尼器在斜拉桥上的减震性能研究[D].西安:长安大学,2015.
[6]江世哲,王社良,李启明.SMA被动隔震装置及其阻尼性能研究[J].西安建筑科技大学学报:自然科学版,2003,35(4):317—320.
[7]王社良.形状记忆合金在结构控制中的应用[M].西安:陕西科学技术出版社,2000.
[8]唐峰.新型形状记忆合金橡胶隔震支座的研究[D].广州:广州大学,2006.
[9]苗晓瑜,王社良.SMA-橡胶复合支座的力学性能及在桥梁结构中的应用研究[J].西安建筑科技大学学报(自然科学版),2012,44(1):28—32.
[10]JTG/T B02—01—2008.公路桥梁抗震设计细则[S].
[11]JTG D62—2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].