高桩承台基础与桥梁结构的动力相互作用
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摘要
采用两质点模型近似模拟群桩基础和基础以上桥梁结构的动力特性,推导出桥墩、基础地震反应的计算公式,然后用数学工具MATLAB编制了一个程序,最后以一个实际结构为背景建立两质点模型进行了动力相互作用规律的探讨.结果表明,承台质量较大的高桩承台基础和基础以上桥梁结构之间的动力相互作用现象非常显著,计算桥墩和基础的地震反应时,承台质量的影响不可忽略,否则可能会引起很大的误差.
Based on a two-particle model approximately simulating the dynamic behavior of pile-group foundation and bridge structure above foundation,the formula calculating the seismic responses is derived,and programmed by MATLAB.Then a two-particle model with an actual structure as the background is established to study the dynamic interaction between the high-rise pile cap foundation and bridge structure.Study results show that,if the mass of a high-rise pile cap is large,there is a significant dynamic interaction between the pile foundation and bridge structure above foundation,so influence of the pile cap mass should not be ignored in the seismic responses analysis of pier and foundation,otherwise very great error may be caused.
Based on a two-particle model approximately simulating the dynamic behavior of pile-group foundation and bridge structure above foundation,the formula calculating the seismic responses is derived,and programmed by MATLAB.Then a two-particle model with an actual structure as the background is established to study the dynamic interaction between the high-rise pile cap foundation and bridge structure.Study results show that,if the mass of a high-rise pile cap is large,there is a significant dynamic interaction between the pile foundation and bridge structure above foundation,so influence of the pile cap mass should not be ignored in the seismic responses analysis of pier and foundation,otherwise very great error may be caused.
引文
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[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,HU Shide,YE Aijun.Seismic design for long-spanbridges[M].Beijing:China Communications Press,2001.
[3]Ingham Tim J,Rodriguez Santiago,Donikian Roupen,et al.Seis-mic analysis of bridges with pile foundations[J].Computers andStructures,1999,72:49.
[4]交通部公路规划设计院.JTJ 004—89公路工程抗震设计规范[S].北京:人民交通出版社,1990.China Highway Planning and Design Institute.JTJ004—89 Speci-fications of earthquake resistant design for highway engineering[J].Beijing:China Communications Press,1990.
[5]Clough R W,Penzien J.Dynamics of structures[M].2nd ed.NewYork:McGraw-Hill,2001.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,HU Shide,YE Aijun.Seismic design for long-spanbridges[M].Beijing:China Communications Press,2001.
[3]Ingham Tim J,Rodriguez Santiago,Donikian Roupen,et al.Seis-mic analysis of bridges with pile foundations[J].Computers andStructures,1999,72:49.
[4]交通部公路规划设计院.JTJ 004—89公路工程抗震设计规范[S].北京:人民交通出版社,1990.China Highway Planning and Design Institute.JTJ004—89 Speci-fications of earthquake resistant design for highway engineering[J].Beijing:China Communications Press,1990.
[5]Clough R W,Penzien J.Dynamics of structures[M].2nd ed.NewYork:McGraw-Hill,2001.
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