在役桥梁结构延性系数的动力评价方法
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摘要
以桥墩的基本振型函数为基础,推导出基于试验动力参数的在役桥梁结构延性系数的计算公式,并给出了结构非弹性地震力的求解方法。对室内钢模型桥利用冲击力锤法进行了模态试验和静力对比试验,实测参数与理论值相差仅2%,在此基础上利用给出的公式可以求得桥墩的变形增加系数为2.78。结果表明,在场地土条件未知的情况下,利用动力试验法对在役桥梁结构延性系数进行评价是可行的。
Based on the pier's mode shape function, this paper studied the methodology of structure ductility coefficient by modal test and the procedure of the structure's inelastic seismic force. A modal test using impact excitation method as well as static test was carried out indoors in a steel model.The dynamic parameter derived from the test had an error of 2% compared with the theoretical one. Using the formula presented in the paper, the pier's deformation coefficient was calculated,which was 2.78. The results indicate that if the foundation on which the bridge is sited is difficult to predominate,the dynamic test is an effective measurement for studying the bridge's ductility coefficient. The method can be used to evaluate the seismic resistance performance of existing bridges. 4 figs, 7 refs.
Based on the pier's mode shape function, this paper studied the methodology of structure ductility coefficient by modal test and the procedure of the structure's inelastic seismic force. A modal test using impact excitation method as well as static test was carried out indoors in a steel model.The dynamic parameter derived from the test had an error of 2% compared with the theoretical one. Using the formula presented in the paper, the pier's deformation coefficient was calculated,which was 2.78. The results indicate that if the foundation on which the bridge is sited is difficult to predominate,the dynamic test is an effective measurement for studying the bridge's ductility coefficient. The method can be used to evaluate the seismic resistance performance of existing bridges. 4 figs, 7 refs.
引文
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[3]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.FAN Li-chu,ZHUO Wei-dong, Seismic design of duc-tility for bridge [ M].Beijing: People’s Communica-tions Press,2001.
[4]陈兴冲.桥墩自振频率的能量公式[J].北京:土木工程学报,1999,32(5):76-80.CHEN Xing-chong.Formulas of energy method for thenatural frequency of bridge piers[J].China Civil Engi-neering Journal,1999,32(5):76-80.
[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 collapse mecha-nism of seismic assessment for existing RC bridgeswith flexible foundation and bearing pads[ J].Journalof Traffic and Transportation Engineering,2003,3(3):26-31.
[6]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):36-40.SONG Yi-fan, HE Shuan-hai, CAO Ji-wei, Analysis fortransverse seismic forces of the fra-me bridge piers basedon energy principle [ J].Journal of Chang’an University(Natural-Science Edition),2002,22(1):36-40.
[7]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 bearing slid-ing under earthquake [ J]. China Journal of Highwayand Transport,2003,16(4):30-35.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Li-chu.Seismic resistance of bridge [M].Shang-hai:Tongji University Press,1997.
[3]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.FAN Li-chu,ZHUO Wei-dong, Seismic design of duc-tility for bridge [ M].Beijing: People’s Communica-tions Press,2001.
[4]陈兴冲.桥墩自振频率的能量公式[J].北京:土木工程学报,1999,32(5):76-80.CHEN Xing-chong.Formulas of energy method for thenatural frequency of bridge piers[J].China Civil Engi-neering Journal,1999,32(5):76-80.
[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 collapse mecha-nism of seismic assessment for existing RC bridgeswith flexible foundation and bearing pads[ J].Journalof Traffic and Transportation Engineering,2003,3(3):26-31.
[6]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):36-40.SONG Yi-fan, HE Shuan-hai, CAO Ji-wei, Analysis fortransverse seismic forces of the fra-me bridge piers basedon energy principle [ J].Journal of Chang’an University(Natural-Science Edition),2002,22(1):36-40.
[7]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 bearing slid-ing under earthquake [ J]. China Journal of Highwayand Transport,2003,16(4):30-35.
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