系梁设置对高墩大跨弯连续刚构桥动力特性及地震响应的影响
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摘要
为了研究结构参数对弯连续刚构桥动力性质的影响,以一高墩弯连续刚构桥为工程背景,基于ANSYS有限元程序,考虑桩土与结构的相互作用,建立了有限元空间分析模型,分析了系梁的道数、系梁的刚度、系梁的位置等3个因素24个不同计算工况对结构自振特性的影响,通过线弹性时程法讨论了在不同参数设置下桥梁结构的地震响应规律.计算结果表明,系梁道数及其刚度明显改变了结构的振型序列,对结构顺桥向地震响应的影响较大,而在其它条件一定时,改变系梁的位置对桥梁结构的自振特性及地震响应影响不大.从动力学上讲,应尽量减小系梁的道数及其刚度.研究结论可为桥梁初步设计提供依据,也可供同类桥梁抗震概念设计参考.
In order to investigate the effect of structural parameters on the dynamic behavior of rigid frame bridge,a curved rigid frame bridge with high piers and long span was taken as an example,the finite element program ANSYS was employed to establish its spatial finite element mode considering the interaction of soil and structure,then 3 parameters and 24 different calculation modes were analyzed to study the structural natural vibration characteristic,the parameters included the number of tie beams,rigidity of tie beams and position of tie beams,finally linear time history method was used to discuss the effect of tie beam on the structural seismic response.The results showed that the number of tie beams and its rigidity remarkably changed the structural vibration mode sequence and had great effect on the longitudinal seismic response of the structure,whereas,the structural vibration characteristic and seismic response had little relationship with the position of tie beams.Therefore,few tie beams and less rigidity should be set.The study can give reference to the preliminary design and seismic conceptual design for the same kind of bridge.
In order to investigate the effect of structural parameters on the dynamic behavior of rigid frame bridge,a curved rigid frame bridge with high piers and long span was taken as an example,the finite element program ANSYS was employed to establish its spatial finite element mode considering the interaction of soil and structure,then 3 parameters and 24 different calculation modes were analyzed to study the structural natural vibration characteristic,the parameters included the number of tie beams,rigidity of tie beams and position of tie beams,finally linear time history method was used to discuss the effect of tie beam on the structural seismic response.The results showed that the number of tie beams and its rigidity remarkably changed the structural vibration mode sequence and had great effect on the longitudinal seismic response of the structure,whereas,the structural vibration characteristic and seismic response had little relationship with the position of tie beams.Therefore,few tie beams and less rigidity should be set.The study can give reference to the preliminary design and seismic conceptual design for the same kind of bridge.
引文
[1]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48Zhu Dongsheng,Liu Shizhong,Yu Lusong.Research on seismic response of curved girder bridges[J].China Journal ofHighway and Transport,2002,15(3):42-48
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[8]周勇军,贺拴海,张岗,等.桥墩截面形式对弯连续刚构桥地震响应的影响[J].公路交通科技,2009,26(2):68-72Zhou Yongjun,He Shuanhai,Zhang Gang,et al.Effect of pier section type on seismic response of curved continuousrigid frame bridge[J].Journal of Highway and Transportation Research and Development,2009,26(2):68-72
[9]石雄伟,刘海鹏,周勇军,等.双薄壁墩间距对连续刚构桥地震响应的影响[J].交通运输工程学报,2010,10(3):35-40Shi Xiongwei,Liu Haipeng,Zhou Yongjun,et al.Effect of double-thin-wall distance on seismic response of continuousrigid frame bridge[J].Journal of Traffic and Transportation Engineering,2010,10(3):35-40
[10]范立础.桥梁抗震[M].上海:同济大学出版社,1997:91-94Fan Lichu.Aseismic of bridge[M].Shanghai:Tongji Press,1997:91-94
[11]苏荣华,彭晨宇,丁文文.设计参数对双层隔振系统动态性能影响的研究[J].应用基础与工程科学学报,2008,16(6):863-869Su Ronghua,Peng Chenyu,Ding Wenwen.Research on two-stage isolation system’dynamic performance affected bydesign parameters[J].Journal of Basic Science and Engineering,,2008,16(6):863-869
[12]冯鹏程,吴游宇,罗玉科.龙潭河特大桥高墩系梁局部应力分析[J].桥梁建设,2005,(2):26-28Feng Pengcheng,Wu Youyu,Luo Yuke.Analysis of local stress of high-rise pier tie beams of Longtanhe River bridge[J].Bridge Construction,2005,(2):26-28
[2]单德山,李乔.铁路曲线梁桥抗震设计分析[J].重庆交通学院学报,2005,24(5):1-4,15Shan Deshan,Li Qiao.Study of aseismic design for railway curve-girder bridges[J].Journal of Chongqing JiaotongUniversity,2005,24(5):1-4,15
[3]王心顺,舒春生.非对称高墩大跨曲线连续刚构桥地震反应分析[J].铁道标准设计,2008,(6):55-57Wang Xinshu,Shu Chunsheng.Seismic response of unsystematic curved continuous rigid frame bridge with high pierand long span[J].Railway Standard Design,2008,(6):55-57
[4]黄庆伟.大跨度曲线连续刚构桥非线性地震反应分析[J].四川建筑,2005,25(1):78-79Huang Qingwei.Analysis for nonlinear seismic response of curved continuous rigid frame bridge with long span[J].Sichuan Architecture,2005,25(1):78-79
[5]邬玉娟,马珩,文丽娜.连系梁对联肢墙抗震性能的影响及设计建议[J].四川建筑,2004,24(5):58-59Wu Yujuan,Ma Heng,Wen Lina.Effect of tie-beam on the seismic response of coupled shear walls and its designsuggestion[J].Sichuan Architecture,2004,24(5):58-59
[6]周勇军,贺拴海,宋一凡,等.连续刚构桥单双薄壁墩地震响应的对比分析[J].中外公路,2007,27(3):114-117Zhou Yongjun,He Shuanhai,Song Yifan,et al.Contrast analysis for seismic response of continuous rigid frame bridgewith single or double-thin-wall[J].Journal of China and Foreign Highway,2007,27(3):114-117
[7]周勇军,全伟,贺拴海.基于正交试验的连续刚构桥地震响应敏感性参数分析[J].地震研究,2006,29(2):176-181Zhou Yongjun,Quan Wei,He Shuanhai.Analysis on sensitive parameters to earthquake response of continuous rigidframe bridges based on cross test technique[J].Journal of Seismological Research,2006,29(2):176-181
[8]周勇军,贺拴海,张岗,等.桥墩截面形式对弯连续刚构桥地震响应的影响[J].公路交通科技,2009,26(2):68-72Zhou Yongjun,He Shuanhai,Zhang Gang,et al.Effect of pier section type on seismic response of curved continuousrigid frame bridge[J].Journal of Highway and Transportation Research and Development,2009,26(2):68-72
[9]石雄伟,刘海鹏,周勇军,等.双薄壁墩间距对连续刚构桥地震响应的影响[J].交通运输工程学报,2010,10(3):35-40Shi Xiongwei,Liu Haipeng,Zhou Yongjun,et al.Effect of double-thin-wall distance on seismic response of continuousrigid frame bridge[J].Journal of Traffic and Transportation Engineering,2010,10(3):35-40
[10]范立础.桥梁抗震[M].上海:同济大学出版社,1997:91-94Fan Lichu.Aseismic of bridge[M].Shanghai:Tongji Press,1997:91-94
[11]苏荣华,彭晨宇,丁文文.设计参数对双层隔振系统动态性能影响的研究[J].应用基础与工程科学学报,2008,16(6):863-869Su Ronghua,Peng Chenyu,Ding Wenwen.Research on two-stage isolation system’dynamic performance affected bydesign parameters[J].Journal of Basic Science and Engineering,,2008,16(6):863-869
[12]冯鹏程,吴游宇,罗玉科.龙潭河特大桥高墩系梁局部应力分析[J].桥梁建设,2005,(2):26-28Feng Pengcheng,Wu Youyu,Luo Yuke.Analysis of local stress of high-rise pier tie beams of Longtanhe River bridge[J].Bridge Construction,2005,(2):26-28
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