连续梁桥模态分析与试验
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摘要
为了研究弹性基础上连续梁的振动特性,提出了连续梁桥墩的振型函数表达式。对室内连续梁桥模型进行静力试验和模态试验,并与有限元模型对比分析,研究了连续梁桥在纵桥向和横桥向的自振特性。结果表明:考虑上下部结构共同作用时,连续梁桥的低阶振动形式主要表现为桥墩的弯曲振动,试验测得的频率和由理论振型函数计算的结果误差不超过6%;说明该桥墩振型函数可以较好地应用于连续梁桥的动力计算中;这种方法可以为此类桥梁的动力和抗震分析提供参考。
The mode shape function of the pier was offered to study the dynamic deformation feature of the continuous beam bridge sited on the elastic foundation.The static experiment and modal test for a continuous beam model were carried out indoor,the results were compared with those of finite element method(FEM),and some conclusions about the dynamic feature of continuous beam in the longitude and transverse direction were obtained accordingly.It is pointed that the whole structure's low vibration performs as the pier's flexural bending if the superstructure and substructure vibrate together.The dynamic parameters from the test have an error of 6% compared with the theoretical ones derived from modal analysis,which testifies the presented mode shape.The results indicate that: this mode shape can be well applied in analyzing the beam's dynamic feature;and the modal analysis method can give a good reference to the seismic analysis for the same type of bridge.2 tabs,11 figs,10 refs.
The mode shape function of the pier was offered to study the dynamic deformation feature of the continuous beam bridge sited on the elastic foundation.The static experiment and modal test for a continuous beam model were carried out indoor,the results were compared with those of finite element method(FEM),and some conclusions about the dynamic feature of continuous beam in the longitude and transverse direction were obtained accordingly.It is pointed that the whole structure's low vibration performs as the pier's flexural bending if the superstructure and substructure vibrate together.The dynamic parameters from the test have an error of 6% compared with the theoretical ones derived from modal analysis,which testifies the presented mode shape.The results indicate that: this mode shape can be well applied in analyzing the beam's dynamic feature;and the modal analysis method can give a good reference to the seismic analysis for the same type of bridge.2 tabs,11 figs,10 refs.
引文
[1]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47WANG Jun-wen,LI Jian-zhong,FAN Li-chu.Parametric study of longitudinal seismic poundingresponse for continuous girder bridges[J].ChinaJournal of Highway and Transport,2005,18(4):42-47.
[2]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.FAN Li-chu,NIE Li-ying,LI Jian-zhong.Dynamiccharacteristic analysis of laminated rubber bearingsliding under earthquake[J].China Journal ofHighway and Transport,2003,16(4):30-35
[3]于泳波,万振江,刘健新.减震技术在公路桥梁中的应用及地震反应分析[J].长安大学学报:自然科学版,2004,24(2):58-60YU Yong-bo,WAN Zhen-jiang,LIU Jian-xin.Seismic reduction design for highway bridge andseismic response[J].Journal of Chang’an University:Natural Science Edition,2004,24(2):58-60.
[4]宋一凡,贺拴海,曹继伟.基于能量原理的框架桥墩地震力分析[J].长安大学学报:自然科学版,2002,22(1):36-40SONG Yi-fan,HE Shuan-hai,CAO Ji-wei.Analysisfor transverse seismic forces of the frame bridge piersbased on energy principle[J].Journal of Chang’anUniversity:Natural Science Edition,2002,22(1):36-40.
[5]宋一凡,王玉萍.计入弹性基础效应的钢筋混凝土桥梁结构塑性倒塌分析[J].交通运输工程学报,2003,3(3):26-31.SONG Yi-fan,WANG Yu-ping.Plastic collapsemechanism of seismic assessment for existing RCbridges with flexible foundation and bearing pads[J].Journal of Traffic and Transportation Engineering,2003,3(3):26-31.
[6]周勇军,贺拴海,宋一凡,等.在役梁桥结构延性系数的动力评价方法[J].长安大学学报:自然科学版,2005,25(4),35-38.ZHOU Yong-jun,HE Shuan-hai,SONG Yi-fan,et al.Dynamic assessment method of ductility coefficientfor existing beam bridges[J].Journal of Chang’anUniversity:Natural Science Edition,2005,25(4):35-38.
[7]宋一凡,周勇军,贺拴海,等.连续梁桥横桥向地震动分析[J].振动与冲击,2006,25(2):147-151.SONG Yi-fan,ZHOU Yong-jun,HE Shuan-hai,et al.Transverse seismic analysis of continuous bridges[J].Journal of Vibration and Shock,2006,25(2):147-151.
[8]沈松,应怀樵,雷速华,等.用锤击法和变时基技术进行黄河铁路桥的模态试验分析[J].振动工程学报,2000,13(3):492-495.SHEN Song,YING Huai-qiao,LEI Su-hua,et al.Modal test for Yellow River bridge exciting withhammer[J].Journal of Vibration Engineering,2000,13(3):492-495.
[9]周勇军,赵小星,贺拴海,等.弯钢箱梁桥的动力分析及模态试验[J].郑州大学学报:工学版,2005,26(4):20-24.ZHOU Yong-jun,ZHAO Xiao-xing,HE Shuan-hai,et al.Dynamic analysis and modal test of a cured steelbox girder[J].Journal of Zhengzhou University:Engineering Science,2005,26(4):20-24.
[10]JTJ 024-85,公路桥梁地基与基础设计规范[S].
[2]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.FAN Li-chu,NIE Li-ying,LI Jian-zhong.Dynamiccharacteristic analysis of laminated rubber bearingsliding under earthquake[J].China Journal ofHighway and Transport,2003,16(4):30-35
[3]于泳波,万振江,刘健新.减震技术在公路桥梁中的应用及地震反应分析[J].长安大学学报:自然科学版,2004,24(2):58-60YU Yong-bo,WAN Zhen-jiang,LIU Jian-xin.Seismic reduction design for highway bridge andseismic response[J].Journal of Chang’an University:Natural Science Edition,2004,24(2):58-60.
[4]宋一凡,贺拴海,曹继伟.基于能量原理的框架桥墩地震力分析[J].长安大学学报:自然科学版,2002,22(1):36-40SONG Yi-fan,HE Shuan-hai,CAO Ji-wei.Analysisfor transverse seismic forces of the frame bridge piersbased on energy principle[J].Journal of Chang’anUniversity:Natural Science Edition,2002,22(1):36-40.
[5]宋一凡,王玉萍.计入弹性基础效应的钢筋混凝土桥梁结构塑性倒塌分析[J].交通运输工程学报,2003,3(3):26-31.SONG Yi-fan,WANG Yu-ping.Plastic collapsemechanism of seismic assessment for existing RCbridges with flexible foundation and bearing pads[J].Journal of Traffic and Transportation Engineering,2003,3(3):26-31.
[6]周勇军,贺拴海,宋一凡,等.在役梁桥结构延性系数的动力评价方法[J].长安大学学报:自然科学版,2005,25(4),35-38.ZHOU Yong-jun,HE Shuan-hai,SONG Yi-fan,et al.Dynamic assessment method of ductility coefficientfor existing beam bridges[J].Journal of Chang’anUniversity:Natural Science Edition,2005,25(4):35-38.
[7]宋一凡,周勇军,贺拴海,等.连续梁桥横桥向地震动分析[J].振动与冲击,2006,25(2):147-151.SONG Yi-fan,ZHOU Yong-jun,HE Shuan-hai,et al.Transverse seismic analysis of continuous bridges[J].Journal of Vibration and Shock,2006,25(2):147-151.
[8]沈松,应怀樵,雷速华,等.用锤击法和变时基技术进行黄河铁路桥的模态试验分析[J].振动工程学报,2000,13(3):492-495.SHEN Song,YING Huai-qiao,LEI Su-hua,et al.Modal test for Yellow River bridge exciting withhammer[J].Journal of Vibration Engineering,2000,13(3):492-495.
[9]周勇军,赵小星,贺拴海,等.弯钢箱梁桥的动力分析及模态试验[J].郑州大学学报:工学版,2005,26(4):20-24.ZHOU Yong-jun,ZHAO Xiao-xing,HE Shuan-hai,et al.Dynamic analysis and modal test of a cured steelbox girder[J].Journal of Zhengzhou University:Engineering Science,2005,26(4):20-24.
[10]JTJ 024-85,公路桥梁地基与基础设计规范[S].
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